Arc extinguish chamber of universal circuit breaker and universal circuit breaker

Abstract

The utility model relates to the technical field of electrical connection devices, in particular to an arc extinguish chamber of a universal circuit breaker and the universal circuit breaker. The arc-extinguishing chamber comprises a first arc-isolating wall, a second arc-isolating wall, an arc-extinguishing grid group, an arc-extinguishing cover and a sealing structure. The sealing structure comprises a first sealing part and a second sealing part, and the first sealing part is arranged on the side, away from the second arc isolating wall, of the first arc isolating wall and located at the end, close to the cover plate, of the first arc isolating wall. The second sealing part is arranged on the side, away from the first arc-isolating wall, of the second arc-isolating wall and located at the end, close to the cover plate, of the second arc-isolating wall. The first sealing part is arranged on the outer side of the first arc isolation wall, and the second sealing part is arranged on the outer side of the second arc isolation wall, so that a gap between the arc extinguish chamber and the cavity wall at the opening of the arc extinguish chamber mounting cavity can be effectively blocked, electric arcs can be prevented from escaping from the gap at the opening, the safety of the universal circuit breaker is improved, and the service life of the universal circuit breaker is prolonged. And circuit faults are reduced.

Description

TECHNICAL FIELD

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

[0002] The universal circuit breaker is a core protection device of a low-voltage power distribution system, which can be used in power distribution system protection, motor control, new energy and other fields. When the circuit is subjected to abnormal conditions such as short circuit, overload and undervoltage, the universal circuit breaker trips rapidly to prevent circuit components from burning out and personal safety accidents.

[0003] At present, the universal circuit breaker mainly uses three-phase circuit breakers and four-phase circuit breakers, and each phase circuit unit is arranged in parallel in the circuit breaker shell. Each phase circuit unit includes a moving contact assembly, a static contact assembly and an arc-extinguishing chamber.

[0004] When the static contact and the moving contact of the universal circuit breaker are separated, an arc is easily generated. As a core component of the circuit breaker, the arc-extinguishing chamber relies on the arc-extinguishing grid piece group to divide the arc into multiple short arcs, increase the arc voltage and cool the arc, so as to extinguish the arc and ensure the normal use of the universal circuit breaker.

[0005] In related technologies, the arc-extinguishing chamber has the phenomenon of escaping from the arc-extinguishing chamber during the arc-extinguishing process. In a multi-phase circuit breaker, the escaped arc is easy to cause safety hazards. CONTENT OF THE INVENTION

[0006] The present application provides an arc-extinguishing chamber of a universal circuit breaker and a universal circuit breaker, which can prevent the arc from escaping from the arc-extinguishing chamber, thereby improving the safety of the circuit breaker.

[0007] The technical solution of the present application is as follows:

[0008] In a first aspect, the present application provides an arc-extinguishing chamber of a universal circuit breaker, which includes a first arc separation wall, a second arc separation wall, an arc-extinguishing grid piece group, an arc-extinguishing cover and a sealing structure. The arc-extinguishing cover includes a cover plate.

[0009] The first arc separation wall and the second arc separation wall are arranged opposite to each other along a first direction. The cover plate is arranged at one end of the first arc separation wall and the second arc separation wall along a second direction.

[0010] The arc-extinguishing grid piece group includes a plurality of arc-extinguishing grid pieces, which are fixed in a stack between the first arc separation wall and the second arc separation wall along a third direction. One end of the arc-extinguishing grid piece group close to the cover plate is an outlet, and the other end of the arc-extinguishing grid piece group is an inlet along the second direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0011] The sealing structure includes a first sealing part and a second sealing part. The first sealing part is disposed on the side of the first arc-isolating wall away from the second arc-isolating wall, and is located at the end of the first arc-isolating wall near the cover plate. The second sealing part is disposed on the side of the second arc-isolating wall away from the first arc-isolating wall, and is located at the end of the second arc-isolating wall near the cover plate. Along a second direction, the first sealing part is used to seal the gap between the first arc-isolating wall and the cavity wall of the arc-extinguishing chamber, and the second sealing part is used to seal the gap between the second arc-isolating wall and the cavity wall on the other side of the arc-extinguishing chamber installation cavity.

[0012] Based on the arc-extinguishing chamber provided in the first aspect, this application provides a first sealing part on the outer side of the first arc-isolating wall near the cover plate and a second sealing part on the outer side of the second arc-isolating wall near the cover plate. In this way, the gap between the first arc-isolating wall and the cavity wall of the arc-extinguishing chamber at the opening, as well as the gap between the second arc-isolating wall and the cavity wall on the other side of the arc-extinguishing chamber at the opening, can be effectively sealed, thereby preventing the arc in the arc-extinguishing chamber from escaping from the gap at the opening. This is beneficial to improving the safety of the universal circuit breaker and reducing circuit failures.

[0013] In one possible design, the first sealing part and the second sealing part are different parts of the same sealing gasket.

[0014] The sealing gasket includes a rectangular mounting portion, a first sealing portion being a folded edge of the first side of the rectangular mounting portion, and a second sealing portion being a folded edge of the second side of the rectangular mounting portion. The first side and the second side are opposite sides.

[0015] The first side is fixed between the first diaphragm wall and the cover plate, and the first sealing part is in contact with the first diaphragm wall. The second side is fixed between the second diaphragm wall and the cover plate, and the second sealing part is in contact with the second diaphragm wall.

[0016] Based on the arc-extinguishing chamber provided by this embodiment, the first sealing part and the second sealing part are configured as an integral sealing gasket. The sealing gasket includes not only the first sealing part and the second sealing part, but also a rectangular mounting part. The first sealing part and the second sealing part are the folded edges of the two opposite sides of the rectangular mounting part. Thus, during installation, only the rectangular mounting part needs to be fixed to realize the setting of the first sealing part on the first arc-isolating wall, and the second sealing part can also be set on the second arc-isolating wall, which has the effect of simple and convenient installation.

[0017] In one possible design, a spiral groove is provided on the side of the cover plate near the first and second diaphragm walls. The spiral groove is provided along the edge of the cover plate, and the rectangular mounting part is embedded in the spiral groove.

[0018] Based on the arc-extinguishing chamber provided by this embodiment, during the assembly of the arc-extinguishing chamber, the rectangular mounting portion of the sealing gasket is embedded in the U-shaped groove. The U-shaped groove serves to limit the positioning of the sealing gasket. In this way, the sealing gasket can be stably positioned between the cover plate and the first arc-isolating wall, and between the cover plate and the second arc-isolating wall, thereby ensuring the relative positions of the first sealing portion and the first arc-isolating wall, and the relative positions of the second sealing portion and the second arc-isolating wall. This helps to prevent the escape of the electric arc and improve the safety of the circuit breaker.

[0019] In one possible design, a positioning hole is provided at the bottom of the groove, and a positioning part is provided on the side of the sealing gasket near the groove, with the positioning part and the positioning hole being interference fit.

[0020] Based on the arc-extinguishing chamber provided by this embodiment, during the assembly of the arc-extinguishing chamber, the sealing gasket and the cover plate can be assembled first, and then the cover plate can be fixed to the first arc-isolating wall and the second arc-isolating wall. During this process, the sealing gasket is not easy to fall off, which facilitates the smooth progress of the installation process.

[0021] In one possible design, along a third direction, the arc flows from the bottom to the top of the arc-extinguishing grid assembly, and along a second direction, the arc flows from the inlet to the outlet of the arc-extinguishing grid assembly.

[0022] One or more arc-extinguishing grids near the bottom of the arc-extinguishing grid assembly are provided with a first air guide groove, and the first air guide groove is located at the end of the arc-extinguishing grid near the outlet.

[0023] Based on the arc-extinguishing chamber provided by this embodiment, the electric arc at the bottom of the arc-extinguishing chamber can quickly enter the flame-extinguishing plate through the first gas guide groove, thereby accelerating the extinguishing of the electric arc.

[0024] In one possible design, the first air guide groove is rectangular in shape, and the dimension of the first air guide groove along the first direction is larger than the dimension of the first air guide groove along the second direction.

[0025] Based on the arc-extinguishing chamber provided by this embodiment, while meeting the gas guiding requirements, the impact of the first gas guiding groove on the arc-extinguishing effect of the arc-extinguishing grid plate can be minimized.

[0026] In one possible design, the arc-extinguishing chamber includes an arc-starting plate disposed between the first and second arc-blocking walls and located at the top of the arc-extinguishing chamber. A second air guide groove is also provided on the arc-starting plate.

[0027] Based on the arc-extinguishing chamber provided in this embodiment, the second air guide groove provided on the arc-starting plate can connect the interior of the arc-extinguishing chamber with the exterior. During arc extinguishing, the internal air pressure in the arc-extinguishing chamber is greater than the external air pressure, so the arc-extinguishing gas can easily flow towards the top of the arc-extinguishing chamber, thereby improving the efficiency of arc dispersion in each layer of the arc-extinguishing grid assembly and accelerating arc extinguishing.

[0028] In one possible design, along the second direction, the second air guide groove extends inward from the edge of the arc-inducing plate near the cover plate until, along the third direction, the second air guide groove overlaps with the inlet projection of the arc-extinguishing grid plate assembly.

[0029] Based on the arc-extinguishing chamber provided by this embodiment, the inlet projection of the second gas guide groove overlaps with that of the arc-extinguishing grid assembly. This helps the arc-extinguishing gas to disperse the electric arc from the bottom to the top of the arc-extinguishing grid assembly, thus accelerating the arc extinguishing process.

[0030] Secondly, this application also provides a universal circuit breaker, including any of the above-mentioned arc-extinguishing chambers.

[0031] The beneficial effects of the universal circuit breaker provided in the second aspect above can be found in the first aspect and the beneficial effects of various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0032] Figure 1 The diagram shown is a schematic diagram of the arc-extinguishing chamber structure of a universal circuit breaker provided in this application.

[0033] Figure 2 An exploded view of an arc-extinguishing chamber provided in an embodiment of this application.

[0034] Figure 3 The diagram shown is a schematic of the structure of a universal circuit breaker with one arc-extinguishing chamber removed, according to an embodiment of this application.

[0035] Figure 4 for Figure 2 A schematic diagram of the structure of the central sealing gasket.

[0036] Figure 5 for Figure 2 A schematic diagram of the combined structure of the middle cover plate and the sealing gasket.

[0037] Figure 6 This is a schematic diagram of the arc path within the arc-extinguishing chamber provided in an embodiment of this application.

[0038] Figure 7 This is a schematic diagram of the structure of the arc-extinguishing grid at the bottom of the arc-extinguishing grid assembly provided in an embodiment of this application.

[0039] Figure 8 This is a schematic diagram of a structure of an arc-starting plate provided in an embodiment of this application.

[0040] The attached figures are labeled as follows:

[0041] 1. Arc-extinguishing chamber;

[0042] 11. First diaphragm wall; 12. Second diaphragm wall;

[0043] 13. Arc-extinguishing grid assembly; 131. Inlet; 132. Outlet; 133. Arc-extinguishing grid; 134. First air guide groove;

[0044] 14. Cover plate; 141. Groove; 142. Positioning hole;

[0045] 15. Sealing gasket; 151. First sealing part; 152. Second sealing part; 153. Rectangular mounting part; 154. Positioning part;

[0046] 16. Arc-starting plate; 161. Second air guide groove;

[0047] 17. Flame extinguishing discs;

[0048] 2. Arc-extinguishing chamber installation cavity; 21. Cavity wall;

[0049] D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0050] 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.

[0051] 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of 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.

[0052] 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.

[0053] 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.

[0054] 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).

[0055] In the description of this application, it should be noted that, unless otherwise expressly 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. A physical connection can be a fixed connection, such as a connection secured by spacers, screws, bolts, or other spacers. 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.

[0056] The following provides a detailed description of this application.

[0057] Universal circuit breakers are core protection devices in low-voltage power distribution systems and can be used in power distribution system protection, motor control, and new energy fields. When a circuit is subjected to abnormal conditions such as short circuit, overload, or undervoltage, the universal circuit breaker trips quickly to prevent circuit components from burning out and personal safety accidents from occurring.

[0058] Currently, universal circuit breakers are mainly three-phase and four-phase circuit breakers. Each phase circuit unit is arranged in parallel in the circuit breaker housing. Each phase circuit unit includes a moving contact assembly, a stationary contact assembly, and an arc-extinguishing chamber.

[0059] When the stationary and moving contacts of a universal circuit breaker separate, an electric arc is easily generated. As the core component of the circuit breaker, the arc-extinguishing chamber relies on the arc-extinguishing grid assembly to divide the arc into multiple short arc segments, increase the arc voltage, and extinguish the arc, thus ensuring the normal operation of the universal circuit breaker.

[0060] In related technologies, during the arc extinguishing process, there is a phenomenon where the electric arc can escape from the current arc extinguishing chamber. In multi-phase circuit breakers, the escaped electric arc can easily cause safety hazards.

[0061] In view of this, this application provides an arc-extinguishing chamber for a universal circuit breaker and a universal circuit breaker, which can prevent unextinguished arcs from escaping to adjacent arc-extinguishing chambers, thereby improving the safety of the universal circuit breaker.

[0062] Figure 1 The diagram shown is a schematic representation of the arc-extinguishing chamber structure of a universal circuit breaker provided in this application. Figure 2 Please refer to the exploded view of an arc-extinguishing chamber provided in the embodiments of this application. Figure 1 and Figure 2The arc-extinguishing chamber 1 of the universal circuit breaker provided in this application includes a first arc-isolating wall 11, a second arc-isolating wall 12, an arc-extinguishing grid assembly 13, an arc-extinguishing cover, and a sealing structure. The arc-extinguishing cover includes a cover plate 14.

[0063] Along the first direction D1, the first arc-blocking wall 11 and the second arc-blocking wall 12 are disposed opposite to each other. Along the second direction D2, the cover plate 14 is disposed at one end of the first arc-blocking wall 11 and the second arc-blocking wall 12.

[0064] The arc-extinguishing grid assembly 13 includes multiple arc-extinguishing grids 133, which are stacked and fixed between the first arc-isolating wall 11 and the second arc-isolating wall 12 along the third direction D3. Along the second direction D2, one end of the arc-extinguishing grid assembly 13 near the cover plate 14 is the outlet, and the other end is the inlet. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.

[0065] The sealing structure includes a first sealing part 151 and a second sealing part 152. The first sealing part 151 is disposed on the side of the first arc-isolating wall 11 away from the second arc-isolating wall 12, and is located at the end of the first arc-isolating wall 11 near the cover plate 14. The second sealing part 152 is disposed on the side of the second arc-isolating wall 12 away from the first arc-isolating wall 11, and is located at the end of the second arc-isolating wall 12 near the cover plate 14. Along the second direction D2, the first sealing part 151 is used to seal the gap between the first arc-isolating wall 11 and the cavity wall of the arc-extinguishing chamber, and the second sealing part 152 is used to seal the gap between the second arc-isolating wall 12 and the cavity wall on the other side of the arc-extinguishing chamber installation cavity.

[0066] Figure 3 The diagram shown is a structural schematic of a universal circuit breaker with one arc-extinguishing chamber removed, according to an embodiment of this application. Please refer to... Figure 3 The universal circuit breaker includes multiple arc-extinguishing chambers 1, which are arranged side by side and installed in multiple arc-extinguishing chamber mounting cavities 2 of the universal circuit breaker. Each arc-extinguishing chamber mounting cavity 2 has an opening through which the arc-extinguishing chamber 1 can be inserted.

[0067] Please combine Figure 1 and Figure 3 When the arc-extinguishing chamber 1 is inserted into the arc-extinguishing chamber mounting cavity 2 through the opening, a gap will exist between the portion of the first arc-isolating wall 11 of the arc-extinguishing chamber 1 near the cover plate 14 and the cavity wall 21 of the arc-extinguishing chamber mounting cavity at the opening. Similarly, a gap may exist between the portion of the second arc-isolating wall 12 of the arc-extinguishing chamber 1 near the cover plate 14 and the cavity wall 21 on the other side of the arc-extinguishing chamber mounting cavity 2 at the opening. In practical applications, it has been found that unextinguished arcs in the arc-extinguishing chamber 1 can escape through the gaps at the opening, and some arcs can climb along the cavity wall 21 at the gaps to adjacent arc-extinguishing chambers 1, causing circuit malfunctions.

[0068] Please combine Figures 1 to 3This application provides a first sealing part 151 on the outer side of the first arc-isolating wall 11 near the cover plate 14, and a second sealing part 152 on the outer side of the second arc-isolating wall 12 near the cover plate 14. This effectively seals the gap between the first arc-isolating wall 11 and the cavity wall 21 of the arc-extinguishing chamber at the opening, as well as the gap between the second arc-isolating wall 12 and the other side cavity wall 21 of the arc-extinguishing chamber at the opening. This prevents the arc in the arc-extinguishing chamber 1 from escaping through the gap at the opening, which helps to improve the safety of the universal circuit breaker and reduce circuit failures.

[0069] It should be noted that, Figure 3 This is merely a specific example of the arc-extinguishing chamber 1 provided in this application. In practical applications, the arc-extinguishing chamber 1 provided in this application can be used not only in applications such as... Figure 3 The four-phase universal circuit breaker shown can also be applied to three-phase universal circuit breakers, two-phase universal circuit breakers, or single-phase universal circuit breakers.

[0070] Figure 4 for Figure 2 Schematic diagram of the structure of the central sealing gasket. Figure 5 for Figure 2 A schematic diagram of the combined structure of the middle cover plate and the sealing gasket.

[0071] Please refer to Figure 2 , Figure 4 and Figure 5 In some embodiments of this application, the first sealing part 151 and the second sealing part 152 are different parts of the same sealing gasket 15.

[0072] The sealing gasket 15 includes a rectangular mounting portion 153. A first sealing portion 151 is a folded edge of the first side of the rectangular mounting portion 153, and a second sealing portion 152 is a folded edge of the second side of the rectangular mounting portion 153. The first and second sides are opposite sides. The first side is fixed between the first arc-blocking wall 11 and the cover plate 14, and the first sealing portion 151 is in contact with the first arc-blocking wall 11. The second side is fixed between the second arc-blocking wall 12 and the cover plate 14, and the second sealing portion 152 is in contact with the second arc-blocking wall 12.

[0073] Specifically, please combine Figure 2 , Figure 4 and Figure 5In some embodiments of this application, the first sealing part 151 and the second sealing part 152 are configured as an integral sealing gasket 15. The sealing gasket 15 includes not only the first sealing part 151 and the second sealing part 152, but also a rectangular mounting part 153. The first sealing part 151 and the second sealing part 152 are folded edges of opposite sides of the rectangular mounting part 153. Thus, during installation, only the rectangular mounting part 153 needs to be fixed to realize the setting of the first sealing part 151 on the first arc-breaking wall 11 and the setting of the second sealing part 152 on the second arc-breaking wall 12, which has the effect of simple and convenient installation.

[0074] It should be noted that, Figures 3 to 5 The sealing gasket 15 shown is only one implementation of the first sealing part 151 and the second sealing part 152 in this application. In other embodiments of this application, the first sealing part 151 and the second sealing part 152 can also be configured as separate structures, with the first sealing part 151 and the second sealing part 152 installed separately. For example, in some embodiments of this application, the first sealing part 151 can be bonded to the first arc-blocking wall 11, and the second sealing part 152 can be bonded to the second arc-blocking wall 12. In addition, the first sealing part 151 and the second sealing part can also be fixed by other methods, such as welding, snap-fitting, etc.

[0075] Please continue to refer to this. Figure 2 , Figure 4 and Figure 5 In some embodiments of this application, a spiral groove 141 is provided on the side of the cover plate 14 near the first arc-blocking wall 11 and the second arc-blocking wall 12. The spiral groove 141 is provided along the edge of the cover plate 14, and the rectangular mounting part 153 is embedded in the spiral groove 141.

[0076] Please continue to refer to this. Figure 2 and Figure 5 In this embodiment, a groove 141 is provided on the side of the cover plate 14 near the first arc-isolating wall 11 and the second arc-isolating wall 12, and the groove 141 is provided along the edge of the cover plate 14. During the assembly of the arc-extinguishing chamber 1, the rectangular mounting portion 153 of the sealing gasket 15 is embedded in the groove 141, and the groove 141 serves to limit the position of the sealing gasket 15. In this way, the sealing gasket 15 can be stably positioned between the cover plate 14 and the first arc-isolating wall 11, and between the cover plate 14 and the second arc-isolating wall 12, thereby ensuring the relative position of the first sealing portion 151 and the first arc-isolating wall 11, and the relative position of the second sealing portion 152 and the second arc-isolating wall 12, which helps to prevent the escape of the electric arc and improve the safety of the circuit breaker.

[0077] Please continue to refer to this. Figure 2 When assembling the arc-extinguishing chamber 1, if the side of the cover plate 14 with the sealing gasket 15 is facing down, the sealing gasket 15 is easy to fall off the cover plate 14 and is not easy to install.

[0078] Based on this, please continue to refer to Figure 2 , Figure 4 and Figure 5 In some embodiments of this application, a positioning hole 142 is also provided at the bottom of the groove 141, and a positioning part 154 is provided on the side of the sealing gasket 15 near the groove 141, with the positioning part 154 and the positioning hole 142 being interference-fitted. Thus, when assembling the arc-extinguishing chamber 1, the sealing gasket 15 can be assembled with the cover plate 14 first, and then the cover plate 14 can be fixed with the first arc-isolating wall 11 and the second arc-isolating wall 12. During this process, the sealing gasket 15 is less likely to fall off, facilitating a smooth installation process.

[0079] Figure 6 For a schematic diagram of the arc path inside the arc extinguishing chamber provided in the embodiments of this application, please refer to the following: Figure 1 and Figure 6 In some embodiments of this application, along the third direction D3, the electric arc flows from the bottom to the top of the arc-extinguishing grid assembly 13. Along the second direction D2, the electric arc flows from the inlet 131 to the outlet 132 of the arc-extinguishing grid assembly 13. One or more arc-extinguishing grids 133 near the bottom of the arc-extinguishing grid assembly 13 are provided with a first air guide groove 134, and the first air guide groove 134 is located at the end of the arc-extinguishing grid 133 near the outlet 132.

[0080] Please combine Figure 1 and Figure 6 In some embodiments of this application, a gas generating component is provided in the arc-extinguishing chamber 1. When an electric arc is generated, the gas generating component is eroded by the high temperature of the electric arc to generate arc-extinguishing gas, which increases the pressure in the arc-extinguishing chamber 1 and pushes the electric arc from the inlet 131 to the outlet 132 of the arc-extinguishing chamber 1. During this process, the arc-extinguishing grid plate group 13 cuts the electric arc, making the electric arc smaller and cooling it, thereby achieving a better arc-extinguishing effect.

[0081] Please continue to refer to this. Figure 1 and Figure 2 Generally, in addition to the cover plate 14, the arc extinguishing hood also includes a flame extinguishing plate 17, which is located at the outlet 132 of the arc extinguishing grid assembly 13. The flame extinguishing plate 17 is typically made of special materials, such as non-woven materials, ceramics, melamine boards, or asbestos fibers. These materials have good heat insulation and heat absorption properties, allowing them to absorb the heat energy generated by the electric arc and extinguish it quickly, preventing the arc from persisting. Furthermore, the arc gas and arc-extinguishing gas passing through the flame extinguishing plate 17 can also be cooled down.

[0082] When the arc that fails to be extinguished in time in the arc extinguishing grid assembly 13 comes out of the arc extinguishing grid assembly 13 with the arc extinguishing gas, the flame extinguishing plate 17 located at the outlet 132 of the arc extinguishing grid assembly 13 will continue to absorb the heat energy in the arc, causing the arc to lose its power and extinguish, assisting the arc extinguishing grid assembly 13 in completing the arc extinguishing, and further improving the arc extinguishing effect of the arc extinguishing chamber 1.

[0083] Please continue to refer to this. Figure 6 Generally speaking, most of the arc generated when the moving contact separates from the stationary contact will flow into the arc-extinguishing grid assembly 13, but a small part of the arc will still be located on the bottom outer side of the arc-extinguishing grid assembly 13, and this part of the arc is difficult to extinguish in time.

[0084] Please continue to refer to this. Figure 1 and Figure 6 In some embodiments of this application, one or more arc-extinguishing grid plates 133 near the bottom of the arc-extinguishing grid plate assembly 13 are provided with a first air guide groove 134, and the first air guide groove 134 is located at the end of the arc-extinguishing grid plate 133 near the outlet 132. In this way, the electric arc at the bottom of the arc-extinguishing chamber 1 can quickly enter the flame extinguishing plate 17 through the first air guide groove 134, thereby accelerating the extinguishing of the electric arc.

[0085] Figure 7 This is a schematic diagram of the structure of the arc-quenching grid at the bottom of the arc-quenching grid assembly provided in an embodiment of this application. Please refer to... Figure 7 In this application, the larger the area of ​​the first air guide groove 134, the better the air guiding effect. However, increasing the area of ​​the first air guide groove 134 will affect the area of ​​the arc extinguishing grid plate 133 where the first air guide groove 134 is located, which may have a certain impact on the arc extinguishing effect of the arc extinguishing grid plate 133. Since the first air guide groove 134 is located at the end of the arc extinguishing grid plate 133 near the outlet 132, the loss of the dimension of the arc extinguishing grid plate 133 in the first direction D1 has a smaller impact on the arc extinguishing effect compared with the loss of the dimension in the second direction D2.

[0086] Please continue to refer to this. Figure 7 In some embodiments of this application, the first air guide groove 134 is rectangular in shape, and the dimension of the first air guide groove 134 along the first direction D1 is larger than the dimension of the first air guide groove 134 along the second direction D2. Thus, based on the arc-extinguishing chamber 1 provided by this embodiment, the influence of the first air guide groove 134 on the arc-extinguishing effect of the arc-extinguishing grid plate 133 can be minimized while meeting the air guide requirements.

[0087] It should be noted that, in this application, the main function of the first gas guide groove 134 is to allow the electric arc on the outer side of the bottom of the arc extinguishing grid plate 133 to flow rapidly through the first gas guide groove 134 to the flame extinguishing plate 17. Therefore, the shape of the first gas guide groove 134 is not limited to... Figure 8 The rectangle shown can also be other shapes.

[0088] Please continue to refer to this. Figure 1 , Figure 2 and Figure 6 In some embodiments of this application, the arc-extinguishing chamber 1 includes an arc-starting plate 16, which is disposed between the first arc-blocking wall 11 and the second arc-blocking wall 12, and located at the top of the arc-extinguishing chamber 1. The arc-starting plate 16 is also provided with a second air guide groove 161.

[0089] Specifically, the initial position of the arc generated when the stationary contact separates is generally located at the bottom of the arc-extinguishing chamber 1, near the inlet 131 of the arc-extinguishing grid assembly 13. During the arc extinguishing process, on the one hand, the arc-extinguishing gas drives the arc to flow from the inlet 131 to the outlet 132 of the arc-extinguishing grid assembly 13, thereby promoting the extinguishing of the arc. On the other hand, the arc-extinguishing gas drives the arc to flow from the bottom to the top of the arc-extinguishing grid assembly 13, thereby enabling the arc to be dispersed among the various layers of arc-extinguishing grids 133 of the arc-extinguishing grid assembly 13, thereby improving the arc extinguishing efficiency of the arc-extinguishing grid assembly 13 and accelerating the arc extinguishing process.

[0090] In this application, the main function of the arc-starting plate 16 is to quickly introduce the electric arc generated when the moving and stationary contacts separate into the arc-extinguishing grid assembly 13, thereby reducing contact erosion and improving arc-extinguishing efficiency. The second air guide groove 161 provided on the arc-starting plate 16 enables the interior of the arc-extinguishing chamber 1 to be connected to the exterior. During arc extinguishing, the internal air pressure in the arc-extinguishing chamber 1 is greater than the external air pressure, so the arc-extinguishing gas easily flows towards the top of the arc-extinguishing chamber 1, thereby improving the efficiency of the electric arc dispersion in each layer of the arc-extinguishing grid 133 of the arc-extinguishing grid assembly 13 and accelerating arc extinguishing.

[0091] Figure 8 This is a schematic diagram of a structure of an arc-starting plate provided in an embodiment of this application. Please refer to it. Figure 1 , Figure 6 and Figure 8 In one embodiment of this application, along the second direction D2, the second air guide groove 161 extends inward from the edge of the arc-inducing plate 16 near the cover plate 14 until along the third direction D3, the second air guide groove 161 overlaps with the inlet 131 of the arc-extinguishing grid plate group 13.

[0092] Specifically, the second gas guide groove 161 connects the interior and exterior of the arc-extinguishing chamber 1, accelerating the flow of the electric arc from the bottom to the top at the inlet 131 of the arc-extinguishing grid assembly 13. During this process, it improves the efficiency of arc dispersion across the various layers of arc-extinguishing grids 133 in the arc-extinguishing grid assembly 13. Furthermore, the second gas guide groove 161 overlaps with the inlet 131 of the arc-extinguishing grid assembly 13, further facilitating the dispersion of the arc from the bottom to the top of the arc-extinguishing grid assembly 13 by the extinguishing gas, thus accelerating arc extinguishing.

[0093] It should be noted that, in this application, the main function of the second air guide groove 161 is to connect the top of the arc-extinguishing chamber 1 with the external space; therefore, the shape of the second air guide groove 161 is not limited to... Figure 8 The U-shaped groove shown can also be in other shapes.

[0094] Based on the same inventive concept, this application also provides a universal circuit breaker, including any of the above-mentioned arc-extinguishing chambers 1. Its beneficial effects can be found in the various possible embodiments of the arc-extinguishing chamber 1, and will not be repeated here.

[0095] It should be noted that the arc-extinguishing chamber 1 of this application can be used in universal circuit breakers, drawer-type circuit breakers, or other types of circuit breakers with similar structures and similar requirements.

[0096] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0097] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An arc-extinguishing chamber of a universal circuit breaker, characterized in that, It includes a first arc-blocking wall, a second arc-blocking wall, an arc-extinguishing grid assembly, an arc-extinguishing cover, and a sealing structure; the arc-extinguishing cover includes a cover plate; Along the first direction, the first arc-blocking wall and the second arc-blocking wall are disposed opposite to each other; along the second direction, the cover plate is disposed at one end of the first arc-blocking wall and the second arc-blocking wall; The arc-extinguishing grid assembly includes multiple arc-extinguishing grids, which are stacked and fixed between the first arc-isolating wall and the second arc-isolating wall along a third direction. Along the second direction, one end of the arc-extinguishing grid assembly near the cover plate is the outlet, and the other end of the arc-extinguishing grid assembly is the inlet; the first direction, the second direction, and the third direction are perpendicular to each other; The sealing structure includes a first sealing part and a second sealing part. The first sealing part is disposed on the side of the first arc-blocking wall away from the second arc-blocking wall and is located at the end of the first arc-blocking wall near the cover plate. The second sealing part is disposed on the side of the second arc-blocking wall away from the first arc-blocking wall and is located at the end of the second arc-blocking wall near the cover plate. Along the second direction, the first sealing part is used to seal the gap between the first arc-isolating wall and the cavity wall of the arc-extinguishing chamber, and the second sealing part is used to seal the gap between the second arc-isolating wall and the cavity wall on the other side of the arc-extinguishing chamber.

2. The arc-extinguishing chamber according to claim 1, characterized in that, The first sealing portion and the second sealing portion are different parts of the same sealing gasket; The sealing gasket includes a rectangular mounting portion, the first sealing portion being a folded edge of a first side of the rectangular mounting portion, and the second sealing portion being a folded edge of a second side of the rectangular mounting portion, wherein the first side and the second side are opposite sides; The first side is fixed between the first arc-blocking wall and the cover plate, and the first sealing part is in contact with the first arc-blocking wall; The second side is fixed between the second arc-blocking wall and the cover plate, and the second sealing part is attached to the second arc-blocking wall.

3. The arc-extinguishing chamber according to claim 2, characterized in that, A spiral groove is provided on the side of the cover plate near the first and second diaphragm walls. The spiral groove is provided along the edge of the cover plate, and the rectangular mounting part is embedded in the spiral groove.

4. The arc-extinguishing chamber according to claim 3, characterized in that, The bottom of the groove is also provided with a positioning hole, and the sealing gasket is provided with a positioning part on the side near the groove, and the positioning part is interference-fitted with the positioning hole.

5. The arc-extinguishing chamber according to any one of claims 1 to 4, characterized in that, Along the third direction, the electric arc flows from the bottom to the top of the arc-extinguishing grid assembly; along the second direction, the electric arc flows from the inlet to the outlet of the arc-extinguishing grid assembly. One or more arc-extinguishing grids near the bottom of the arc-extinguishing grid assembly are provided with a first air guide groove, and the first air guide groove is located at the end of the arc-extinguishing grid near the outlet.

6. The arc-extinguishing chamber according to claim 5, characterized in that, The first air guide groove is rectangular in shape, and the dimension of the first air guide groove along the first direction is greater than the dimension of the first air guide groove along the second direction.

7. The arc-extinguishing chamber according to any one of claims 1 to 4, characterized in that, The arc-extinguishing chamber includes an arc-initiating plate, which is disposed between the first arc-isolating wall and the second arc-isolating wall and located at the top of the arc-extinguishing chamber; the arc-initiating plate is also provided with a second air guide groove.

8. The arc-extinguishing chamber according to claim 7, characterized in that, Along the second direction, the second air guide groove extends inward from the edge of the arc-inducing plate near the cover plate until, along the third direction, the second air guide groove overlaps with the inlet projection of the arc-extinguishing grid assembly.

9. A universal circuit breaker, characterized in that, Includes the arc-extinguishing chamber as described in any one of claims 1 to 8.

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