An arc extinguishing chamber and molded case circuit breaker

Abstract

The application relates to the technical field of electrical connection devices, in particular to an arc-extinguishing chamber and a molded case circuit breaker. The arc-extinguishing chamber provided by the application comprises a mounting frame and an arc-extinguishing grid piece group. The mounting frame comprises a first side plate, a second side plate, a first baffle and a second baffle. The first baffle and the second baffle shield the space between the first side plate and the second side plate. The first baffle is arranged close to the upper ends of the first side plate and the second side plate, and a gas outlet is reserved between the first baffle and the upper ends. The second baffle is connected with the first baffle and extends to the lower ends of the first side plate and the second side plate. Based on the arc-extinguishing chamber provided by the application, the arc-extinguishing chamber itself comprises the first baffle and the second baffle with insulation performance, the insulation baffles and white paper boards independently arranged at the outlet of the arc-extinguishing chamber grid piece group in the prior art are omitted, the assembly efficiency of the circuit breaker can be improved, and materials can be saved. In addition, in the closing and opening test, the first baffle can be the outlet of high-temperature gas, so that the damage of contactors and other components can be avoided.

Description

Technical Field

[0001] This application relates to the field of electrical connection device technology, and in particular to an arc-extinguishing chamber and a molded case circuit breaker. Background Technology

[0002] The arc-extinguishing chamber is an important component of a circuit breaker. When a large current flows through the circuit breaker, during the opening process of the moving and stationary contacts, the arc-extinguishing chamber can ignite and cut the electric arc between the moving and stationary contacts, thereby accelerating the extinction of the arc.

[0003] Some existing arc-extinguishing chambers have their outlets open. When in use, the arc inlet of the arc-extinguishing grid assembly faces the contact assembly, and the outlet of the arc-extinguishing grid assembly faces the terminal area of ​​the circuit breaker.

[0004] To improve the safety of circuit breaker operation, an insulating baffle is installed at the outlet of the arc-extinguishing grid assembly. Furthermore, vent holes are provided on the insulating baffle so that the high-temperature gas generated during arc extinguishing can flow out through these vents, thus preventing backflow of high-temperature gas and its adverse effects on internal circuit breaker components, such as contacts.

[0005] In addition, to prevent foreign objects from entering the circuit breaker through the vents, white cardboard was placed side by side on the side of the insulating baffle away from the arc-extinguishing grid assembly.

[0006] In the above structure, the arc-extinguishing chamber, insulating baffle, and white cardboard are all independent structures. Each of these components needs to be installed separately with the circuit breaker base, which presents an inconvenience in installation. Furthermore, the insulating baffle and white cardboard are relatively expensive to produce. Utility Model Content

[0007] This application provides an arc-extinguishing chamber and a molded case circuit breaker. The arc-extinguishing chamber integrates the functions of an insulating baffle and a white cardboard, saves materials, and facilitates the assembly of the circuit breaker.

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

[0009] In a first aspect, this application provides an arc-extinguishing chamber, which includes a mounting frame and an arc-extinguishing grid assembly. The mounting frame includes a first side plate, a second side plate, a first baffle, and a second baffle.

[0010] Along the first direction, the first side plate and the second side plate are arranged opposite to each other. Along the second direction, the first baffle and the second baffle are arranged at the same end of the first side plate and the second side plate, respectively, to block the space between the first side plate and the second side plate.

[0011] Along a third direction, the first baffle is positioned near the upper end of the first and second side plates, with a gas outlet reserved between it and the upper end. The second baffle connects to the first baffle and extends to the lower end of the first and second side plates. When the arc-extinguishing chamber is installed, the lower end is the end of the first and second side plates near the circuit breaker base, and the upper end is the other end of the first and second side plates opposite to the lower end.

[0012] Both the first baffle and the second baffle are insulating boards, and the first baffle is a flexible board that is detachably connected to the first side plate and the second side plate. The first side plate, the second side plate, and the second baffle are integrally formed.

[0013] The arc-extinguishing grid assembly is fixedly installed in the space enclosed by the first side plate, the second side plate, the first baffle, and the second baffle. The outlet of the arc-extinguishing grid assembly faces the first baffle, the second baffle, and the gas outlet.

[0014] The first direction, the second direction, and the third direction are perpendicular to each other.

[0015] Based on the arc-extinguishing chamber provided in this application, the arc-extinguishing chamber itself includes a first baffle and a second baffle with insulating properties, which eliminates the need for the independently installed insulating baffle and white cardboard at the outlet of the arc-extinguishing chamber grid assembly in the prior art, thus improving the circuit breaker assembly efficiency. The first and second baffles each play a role, meeting the requirements for insulation and preventing foreign object ingress. Furthermore, the first and second baffles have a low overlap in the second direction, resulting in greater material savings compared to the existing structure where the insulating baffles and white cardboard are arranged side-by-side. In addition, during the circuit breaker's opening and closing tests, the first baffle can serve as an outlet for high-temperature gas, thus preventing damage to components such as contacts.

[0016] In one possible design, the mounting bracket also includes a top plate, and the arc-extinguishing chamber also includes arc-isolating components.

[0017] Along the third direction, the top plate is set above the first side plate and the second side plate, and covers the space between the first side plate and the second side plate.

[0018] Along the second direction, the arc-blocking component is located at the arc inlet of the arc-extinguishing grid assembly and is in contact with the first side plate and the second side plate.

[0019] The arc-blocking component is provided with a receiving groove that is connected to the arc inlet at the location opposite to the arc inlet. Along the first direction, the width of the receiving groove is smaller than the width of the arc inlet, and the moving contact and the stationary contact come into contact and separate in the receiving groove.

[0020] Based on the arc-extinguishing chamber provided in this embodiment, a top plate is provided on top of the arc-extinguishing grid assembly, and an arc-isolating component is provided at the arc inlet of the arc-extinguishing grid assembly. The width of the receiving groove formed on the arc-isolating component is smaller than the width of the arc inlet. This helps to improve the sealing performance of the arc-extinguishing chamber. The better the sealing performance of the arc-extinguishing chamber, the greater the pressure difference between the inside and outside of the arc-extinguishing chamber, and the faster the arc transfers into the arc-extinguishing chamber, thereby accelerating arc extinguishing.

[0021] In one possible design, along the first direction, the outline of the main body of the arc-extinguishing grid assembly at one end of the arc inlet is a broken line, and the outline includes a first line segment and a second line segment connected to each other.

[0022] Along the third direction, the arc-extinguishing grid plate corresponding to the first line segment is closer to the top plate, while the arc-extinguishing grid plate corresponding to the second line segment is relatively farther away from the top plate.

[0023] Along the second direction, the end where the first line segment connects to the second line segment is farther from the first baffle relative to the other end of the first line segment and the other end of the second line segment.

[0024] Along the first direction, the first side plate and the second side plate cover the arc-extinguishing grid assembly, and the outline of the first side plate and the second side plate at the arc inlet end is a polygonal shape that matches the arc-extinguishing grid assembly.

[0025] The arc-blocking component includes an integrally formed arc-blocking part and a blocking part. The arc-blocking part is located at the arc-extinguishing grid plate corresponding to the second line segment. The surface of the arc-blocking part that contacts the first side plate and the second side plate includes a first inclined surface that is adapted to the shape of the first side plate and the second side plate. A receiving groove is formed in the arc-blocking part.

[0026] The blocking part is located at the arc-extinguishing grid plate corresponding to the first line segment. The blocking part is inclined towards the top plate relative to the arc-blocking part. The surface of the blocking part that contacts the first side plate and the second side plate is a second inclined surface that matches the shape of the first side plate and the second side plate. The blocking part can cover the arc entrance at the corresponding location of the first line segment.

[0027] Based on the arc-extinguishing chamber provided in this embodiment, the main body of the arc-isolating part is disposed at the arc-extinguishing grid plate corresponding to the second line segment, and a receiving groove is formed in the arc-isolating part. A blocking part is disposed at the arc-extinguishing grid plate corresponding to the first line segment. The blocking part is inclined relative to the arc-isolating part towards the top plate, and contacts the top plate, the first side plate, and the second side plate to cover the arc inlet corresponding to the first line segment. In this way, the arc-isolating component can better integrate with the first and second side plates, improving the sealing of the arc-extinguishing chamber and thus accelerating arc extinguishing.

[0028] In one possible design, a fastening groove is also provided on the first inclined surface, and the arc-extinguishing grid assembly has a first arc-extinguishing grid that is interference-fitted with the fastening groove. The first arc-extinguishing grid is interference-fitted with the fastening groove.

[0029] Based on the arc-extinguishing chamber provided by this embodiment, the arc-isolating part is interference-fitted with the arc-extinguishing grid plate through the fastening groove on the first inclined surface. In this way, the various components of the arc-extinguishing chamber can be assembled into an independent whole structure. During the circuit breaker assembly, the entire arc-extinguishing chamber can be installed with the base of the circuit breaker, thereby improving the installation efficiency.

[0030] In one possible design, the first inclined surface is also provided with a positioning plate extending toward the arc-extinguishing grid assembly.

[0031] The positioning plate contacts the groove wall of at least some of the arc-extinguishing grids in the arc-extinguishing grid assembly, which is used to determine the mating position of the arc-extinguishing grid assembly and the arc-blocking component in the first direction.

[0032] Based on the arc-extinguishing chamber provided by this embodiment, the positioning plate contacts the groove wall of at least some of the arc-extinguishing grid plates in the arc-extinguishing grid plate group. Thus, when the arc-extinguishing grid plates and the arc-blocking component are assembled, the positioning plate can determine the mating position of the arc-extinguishing grid plate group and the arc-blocking component in the first direction, which facilitates the assembly of the arc-extinguishing grid plates and the arc-blocking component.

[0033] In one possible design, one side of the positioning plate is the wall of the receiving groove, and the other side of the positioning plate is provided with a plug-in block, on which a fastening groove is formed.

[0034] A positioning protrusion is also provided on the side of the plug block away from the positioning plate. The positioning protrusion is adapted to the groove wall of the slot of the first arc-extinguishing grid plate on the mounting bracket. The mounting bracket is plugged into the positioning protrusion through the slot of the first arc-extinguishing grid plate.

[0035] Based on the arc-extinguishing chamber provided by this embodiment, a positioning protrusion is also provided on the side of the plug block away from the positioning plate. The mounting bracket is plugged into the positioning protrusion through a slot, which can improve the assembly reliability of the mounting bracket, the arc-extinguishing grid plate group and the arc-blocking component.

[0036] In one possible design, the arc-blocking component also includes a bottom, which is integrally formed with the arc-blocking part and the blocking part. Along the second direction, the bottom extends relative to the arc-blocking component towards the end of the first side plate and the second side plate away from the top plate. The bottom contacts the first side plate and the second side plate, and supports the mounting frame and the arc-extinguishing grid plate assembly inside the mounting frame.

[0037] Based on the arc-extinguishing chamber provided by this embodiment, the bottom is integrally formed with the arc-isolating part and the blocking part. The bottom can support the mounting frame and the arc-extinguishing grid plate assembly inside the mounting frame, preventing the arc-isolating component from separating from the mounting frame and the arc-extinguishing grid plate assembly under the action of gravity, thereby improving the reliability of the arc-extinguishing chamber assembly structure.

[0038] In one possible design, multiple rows of slots are symmetrically arranged on the opposite side of the first and second side plates along the first direction. The arc-extinguishing grid plates are inserted into the slots one by one.

[0039] Based on the arc-extinguishing chamber provided by this embodiment, the arc-extinguishing grid is connected to the first side plate and the second side plate by plugging in, making the arrangement of the arc-extinguishing grid simpler.

[0040] In one possible design, along the second direction, the arc-extinguishing grids of the arc-extinguishing grid assembly are tilted toward the direction away from the top plate.

[0041] The first arc-extinguishing grid plate is interference-fitted with the fastening groove, and some of the remaining arc-extinguishing grid plates abut against the first inclined surface, while others abut against the second inclined surface.

[0042] Based on the arc-extinguishing chamber provided by this embodiment, at least one first arc-extinguishing grid plate in the arc-extinguishing grid plate assembly is interference-fitted with the fastening groove, and at least a portion of the remaining arc-extinguishing grid plates abut against the first and second inclined surfaces. This prevents the arc-extinguishing grid plates inserted into the mounting bracket from falling off, improving the reliability of the arc-extinguishing chamber.

[0043] Secondly, based on the same inventive concept, this application also provides a molded case circuit breaker, including any of the aforementioned arc-extinguishing chambers. Its beneficial effects can be found in the first aspect and the beneficial effects of its various possible embodiments, and will not be repeated here. Attached Figure Description

[0044] Figure 1 A structural diagram of an arc-extinguishing chamber provided for existing technology.

[0045] Figure 2 This is a schematic diagram of the structure of an arc-extinguishing chamber provided in an embodiment of this application.

[0046] Figure 3 for Figure 2 The diagram shown is a structural representation of the arc-extinguishing chamber from another perspective.

[0047] Figure 4 This is a structural diagram showing the arc-extinguishing chamber and its working relationship with the moving and stationary contacts provided in an embodiment of this application.

[0048] Figure 5 for Figure 2 Exploded view.

[0049] Figure 6 This is a structural diagram of an arc-extinguishing chamber provided for an embodiment of this application.

[0050] Figure 7 This is a schematic diagram of the structure of an arc-isolating component in an arc-extinguishing chamber provided in an embodiment of this application.

[0051] Figure 8 This is a schematic diagram of the structure of the arc-extinguishing chamber combined with the stationary and moving contacts, as provided in an embodiment of this application.

[0052] Figure 9 for Figure 8Cross-sectional view.

[0053] Figure 10 This is a schematic diagram of the structure of an arc-extinguishing grid assembly and an arc-blocking component provided in an embodiment of this application.

[0054] The reference numerals in the prior art are:

[0055] 1′, Mounting bracket; 11′, First side panel; 12′, Second side panel;

[0056] 2′, Arc-extinguishing grid assembly; 21′, Arc inlet; 22′, Arc-extinguishing grid assembly outlet; 3′, Insulating baffle; 31′, Vent; 4′, White cardboard;

[0057] The reference numerals in this application are:

[0058] 1. Mounting bracket; 11. First side plate; 12. Second side plate; 111. Slot; 13. First baffle; 14. Second baffle; 15. Top plate; 16. Gas outlet;

[0059] 2. Arc-extinguishing grid assembly; 21. Arc inlet; 22. Arc-extinguishing grid assembly outlet; 22. First arc-extinguishing grid;

[0060] 3. Arc-blocking component; 31. Receiving groove; 32. Arc-blocking part; 321. First inclined surface; 322. Fastening groove; 323. Positioning plate; 324. Positioning protrusion; 33. Blocking part; 331. Second inclined surface; 34. Bottom;

[0061] 4. Moving contact; 5. Stationary contact;

[0062] D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0067] 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.

[0068] 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).

[0069] 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.

[0070] The present application will be described in detail below with reference to the accompanying drawings.

[0071] Figure 1 A structural diagram of an arc-extinguishing chamber is provided for the prior art. In the prior art, the arc-extinguishing chamber includes a mounting frame 1' and an arc-extinguishing grid assembly 2'. The mounting frame 1' consists only of a first side plate 11' and a second side plate 12', which are arranged opposite to each other. The arc-extinguishing grid assembly 2' is disposed in the space between the first side plate 11' and the second side plate 12'. The outlet of the arc-extinguishing grid assembly 2' is in an open state.

[0072] When the arc-extinguishing chamber is in use, the arc inlet 21' of the arc-extinguishing grid assembly 2' faces the contact assembly, and the outlet 22' of the arc-extinguishing grid assembly faces the terminal area of ​​the circuit breaker.

[0073] To improve the safety of circuit breaker operation, an insulating baffle 3' is installed at the outlet 22' of the arc-extinguishing grid assembly. Furthermore, an air vent 31' is provided on the insulating baffle 3', allowing the high-temperature gas generated during arc extinguishing to flow out through the air vent 31', thus preventing backflow of high-temperature gas from adversely affecting internal circuit breaker components such as contacts.

[0074] In addition, to prevent foreign objects from entering the circuit breaker through the vent 31', white cardboard 4' is placed side by side on the side of the insulating baffle 3' away from the arc-extinguishing grid assembly 2'.

[0075] In the above structure, the arc-extinguishing chamber, the insulating baffle 3', and the white cardboard 4' are all independent structures. These components need to be installed separately with the circuit breaker base, which presents an inconvenience in installation. Furthermore, the insulating baffle 3' and the white cardboard 4' are relatively expensive to produce.

[0076] In view of this, this application provides an arc-extinguishing chamber. Figure 2 This is a schematic diagram of the structure of an arc-extinguishing chamber provided in an embodiment of this application. Figure 3 for Figure 2 The diagram shows the arc-extinguishing chamber from another perspective. Please refer to... Figure 2 and Figure 3 The arc-extinguishing chamber provided in this application includes a mounting frame 1 and an arc-extinguishing grid assembly 2. The mounting frame 1 includes a first side plate 11, a second side plate 12, a first baffle 13, and a second baffle 14.

[0077] Along the first direction D1, the first side plate 11 and the second side plate 12 are disposed opposite to each other. Along the second direction D2, the first baffle 13 and the second baffle 14 are disposed at the same end of the first side plate 11 and the second side plate 12, and block the space between the first side plate 11 and the second side plate 12.

[0078] Along direction D3, the first baffle 13 is positioned near the upper end of the first side plate 11 and the second side plate 12, with a gas outlet 16 reserved between it and the upper end. The second baffle 14 connects to the first baffle 13 and extends to the lower end of the first side plate 11 and the second side plate 12. When the lower end is installed as an arc-extinguishing chamber, the first side plate 11 and the second side plate 12 are located near one end of the circuit breaker base, and the upper end is the other end of the first side plate 11 and the second side plate 12 opposite to the lower end.

[0079] Both the first baffle 13 and the second baffle 14 are insulating boards, and the first baffle 13 is a flexible board that is detachably connected to the first side plate 11 and the second side plate 12. The first side plate 11, the second side plate 12, and the second baffle 14 are integrally formed.

[0080] The arc-extinguishing grid assembly 2 is fixedly installed in the space enclosed by the first side plate 11, the second side plate 12, the first baffle 13, and the second baffle 14. The outlet of the arc-extinguishing grid assembly 2 faces the first baffle 13, the second baffle 14, and the gas outlet 16. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.

[0081] Figure 4 This is a structural diagram illustrating the interaction between the arc-extinguishing chamber and the moving and stationary contacts, as provided in an embodiment of this application. Please refer to... Figures 2 to 4 The arc-extinguishing chamber includes a mounting frame 1 and an arc-extinguishing grid assembly 2. The arc-extinguishing grid assembly 2 is fixedly installed by the mounting frame 1. In use, the arc-extinguishing chamber is installed in the base of the circuit breaker. One end of the arc inlet 21 of the arc-extinguishing grid assembly 2 is close to the area where the moving contact 4 and the stationary contact 5 contact and separate, and one end of the arc-extinguishing grid assembly 2 is close to the terminal area.

[0082] When the circuit breaker trips, the high-temperature electric arc generated by the separation of the moving contact 4 and the stationary contact 5 heats the surrounding gas. The gas expands due to heat, which carries the arc into the arc-extinguishing chamber. The arc-extinguishing chamber cuts and cools the arc, extinguishing it. The high-temperature gas heated by the arc flows out from the outlet 22 of the arc-extinguishing grid assembly, and is blocked by the first baffle 13 and the second baffle 14, flowing out from the gas outlet 16.

[0083] Please continue to combine Figures 2 to 4 Along the third direction D3, the area where the moving contact 4 and the stationary contact 5 contact and separate is generally near the lower end of the arc-extinguishing chamber, which is also the end of the arc-extinguishing chamber closest to the circuit breaker base. Since the arc is generated near the lower end of the arc-extinguishing chamber, the density of the high-temperature gas is greater closer to the lower end of the arc-extinguishing chamber along the third direction D3, and less closer to the upper end.

[0084] In this application, the mounting bracket 1 includes a first baffle 13 and a second baffle 14. The first baffle 13 is close to the upper end of the arc-extinguishing chamber, and the second baffle 14 is close to the lower end of the arc-extinguishing chamber. Therefore, the second baffle 14 is subjected to greater impact from the high-temperature gas, while the first baffle 13 is subjected to less impact from the high-temperature gas.

[0085] In this application, the second baffle 14 is integrally formed with the first side plate 11 and the second side plate 12, possessing high pressure-bearing capacity and improving the reliability of the mounting bracket 1. The first baffle 13 is detachably connected to the first side plate 11 and the second side plate 12, and the first baffle 13 can be made of a material different from the first side plate 11 and the second side plate 12. Since the first baffle 13 withstands relatively small impacts, a material with lower strength or a thinner sheet can be selected to save costs.

[0086] Furthermore, during the circuit breaker's closing and opening tests, the circuit breaker will experience segmented high currents. These segmented high currents generate greater energy, and the weaker first baffle 13 will be breached by the high-temperature gas. Thus, the first baffle 13 also becomes an outlet for the high-temperature gas. This prevents the high-temperature gas from being forcefully intercepted and flowing back to the contact area, avoiding damage to the contacts and other components.

[0087] During normal operation, the first baffle 13 is not subjected to high-energy impacts, effectively preventing foreign objects from entering the circuit breaker. The second baffle 14 is integrally formed with the first side plate 11 and the second side plate 12, has high strength, and will not be broken by high-temperature airflow, thus providing good insulation protection.

[0088] and Figure 1 Compared to the structure shown, in this application, the overlap between the first baffle 13 and the second baffle 14 is lower. Therefore, compared to... Figure 1 As shown in the layered structure, the arc-extinguishing chamber of this application saves more materials.

[0089] On the other hand, the first baffle 13 and the second baffle 14 of this application can form an integral mounting structure with the mounting bracket 1, which also facilitates the assembly of the circuit breaker.

[0090] In summary, the arc-extinguishing chamber provided in this application includes a first baffle 13 and a second baffle 14 with insulating properties, eliminating the need for independently installed insulating baffles and white cardboard at the outlet of the arc-extinguishing chamber grid assembly in the prior art, thus improving the circuit breaker assembly efficiency. The first baffle 13 and the second baffle 14 each serve a specific function, meeting the requirements for insulation and preventing foreign object ingress. Furthermore, the overlap between the first baffle 13 and the second baffle 14 is low, resulting in greater material savings compared to the existing structure where insulating baffles and white cardboard are arranged side-by-side. In addition, during the circuit breaker's opening and closing tests, the first baffle 13 can serve as an outlet for high-temperature gas, thus preventing damage to components such as contacts.

[0091] Please continue to refer to this. Figure 2 In some embodiments of this application, the first side plate 11, the second side plate 12, and the second baffle 14 may be made of thermosetting plastics, such as insulating materials like DMC.

[0092] Figure 5 for Figure 2 In some embodiments of this application, along the second direction D2, first slots 111 for mounting the first baffle 13 can be symmetrically provided at the ends of the first side plate 11 and the second side plate 12. The first slots 111 extend along the third direction D3, so that the first baffle 13 can be connected to the first side plate 11 and the second side plate 12 by plugging in.

[0093] Please continue to refer to this. Figure 5 In some embodiments of this application, the first baffle 13 is white paperboard. This white paperboard is not ordinary paperboard, but a high-performance phenolic resin-based insulating laminate. The most common type is phenolic resin laminated paperboard, followed by phenolic resin laminated fabric. The function of the white paperboard is to provide excellent electrical insulation properties, mechanical strength, and a certain degree of heat resistance. Thus, the first baffle 13 can both serve as an insulating barrier and withstand high temperatures and other impacts during normal arc extinguishing processes without easily being damaged.

[0094] It should be noted that, in addition to white cardboard, the first baffle 13 can also be a plastic board with a certain strength and flame retardancy.

[0095] Figure 6 This is a structural diagram of an arc-extinguishing chamber provided in an embodiment of this application. Figure 7 This is a structural schematic diagram of an arc-isolating component in an arc-extinguishing chamber provided in an embodiment of this application. Please refer to... Figure 3 , Figure 6 and Figure 7 In some embodiments of this application, the mounting frame 1 further includes a top plate 15, and the arc-extinguishing chamber further includes an arc-isolating component 3. Along the third direction D3, the top plate 15 is disposed at the upper end of the first side plate 11 and the second side plate 12, and blocks the space between the first side plate 11 and the second side plate 12.

[0096] Along the second direction D2, the arc-blocking component 3 is disposed at the arc inlet 21 of the arc-extinguishing grid assembly 2 and is in contact with the first side plate 11 and the second side plate 12.

[0097] The arc-blocking component 3 is provided with a receiving groove 31 that is connected to the arc inlet 21 at the position opposite to the arc inlet 21. Along the first direction D1, the width of the receiving groove 31 is smaller than the width of the arc inlet 21, and the moving contact 4 and the stationary contact 5 contact and separate in the receiving groove 31.

[0098] For details, please refer to [link / reference]. Figure 3 , Figure 6 and Figure 7 In some embodiments of this application, a top plate 15 is provided on the top of the arc-extinguishing grid assembly 2, and an arc-blocking component 3 is provided at the arc inlet 21 of the arc-extinguishing grid assembly 2, wherein the width of the receiving groove 31 formed on the arc-blocking component 3 is smaller than the width of the arc inlet 21. This helps to improve the sealing of the arc-extinguishing chamber.

[0099] Once an electric arc is generated in the receiving tank 31, it heats the surrounding gas, causing it to expand rapidly. This creates a significant pressure difference between the inside and outside of the arc-extinguishing chamber. This pressure difference propels the arc towards the arc-extinguishing grid assembly 2. The arc is then extinguished by the cooling and cutting action of the arc-extinguishing grid assembly 2. The high-temperature gas escapes through the gas outlet 16 of the arc-extinguishing chamber. During this process, the better the sealing of the arc-extinguishing chamber and the greater the pressure difference between the inside and outside, the faster the arc transfers, thus accelerating arc extinguishing.

[0100] Please continue to refer to this. Figure 3 In some embodiments of this application, along the first direction D1, the outline of the main body portion of the arc-extinguishing grid assembly 2 at one end of the arc inlet 21 is a broken line, and the outline includes a first line segment and a second line segment connected together. Along the third direction D3, the arc-extinguishing grid corresponding to the first line segment is closer to the top plate 15, and the arc-extinguishing grid corresponding to the second line segment is relatively farther from the top plate 15. Along the second direction D2, the end where the first and second line segments connect is farther from the first baffle 13 than the other ends of both the first and second line segments.

[0101] Along the first direction D1, the first side plate 11 and the second side plate 12 cover the arc extinguishing grid plate group 2. The outline of the first side plate 11 and the second side plate 12 at one end of the arc inlet 21 is a polygonal shape that matches the arc extinguishing grid plate group 2.

[0102] Please combine Figure 3 , Figure 6 and Figure 7 The arc-blocking component 3 includes an integrally formed arc-blocking part 32 and a blocking part 33. The arc-blocking part 32 is disposed at the arc-extinguishing grid plate corresponding to the second line segment. The surface of the arc-blocking part 32 that contacts the first side plate 11 and the second side plate 12 includes a first inclined surface 321 that is adapted to the shape of the first side plate 11 and the second side plate 12. The receiving groove 31 is formed in the arc-blocking part 32.

[0103] The blocking part 33 is disposed at the arc-extinguishing grid plate corresponding to the first line segment. The blocking part 33 is inclined towards the top plate 15 relative to the arc-blocking part 32. The surface of the blocking part 33 that contacts the first side plate 11 and the second side plate 12 is a second inclined surface 331 that is adapted to the shape of the first side plate 11 and the second side plate 12. Furthermore, the blocking part 33 can cover the arc inlet 21 corresponding to the first line segment.

[0104] Figure 8 This is a schematic diagram of the structure of the arc-extinguishing chamber combined with the stationary and moving contacts according to an embodiment of this application. Figure 9 for Figure 8 The cross-sectional view. Please refer to... Figure 3 , Figure 8 and Figure 9Specifically, influenced by the movement trajectory of the moving contact 4, in some embodiments of this application, along the first direction D1, the outline of the main body of the arc-extinguishing grid plate group 2 at one end of the arc inlet 21 is a broken line shape, and the shapes of the first side plate 11 and the second side plate 12 at one end of the arc inlet 21 are broken lines that are adapted to the arc-extinguishing grid plate group 2.

[0105] In this configuration, the main body of the arc-isolating part 32 is located at the arc-extinguishing grid plate corresponding to the second line segment, and the receiving groove 31 is formed in the arc-isolating part 32. The blocking part 33 is located at the arc-extinguishing grid plate corresponding to the first line segment. The blocking part 33 is inclined relative to the arc-isolating part 32 towards the top plate 15. The blocking part 33 contacts the top plate 15, the first side plate 11, and the second side plate 12, and is used to cover the arc inlet 21 corresponding to the first line segment. In this way, the arc-isolating component 3 can be better combined with the first side plate 11 and the second side plate 12, improving the sealing of the arc-extinguishing chamber and promoting the transfer of the arc into the arc-extinguishing grid plate assembly 2, thereby improving the arc extinguishing efficiency.

[0106] Figure 10 This is a schematic diagram illustrating the structure of an arc-extinguishing grid assembly and an arc-blocking component in accordance with an embodiment of this application. Please refer to the following: Figure 7 and Figure 10 In some embodiments of this application, a fastening groove 322 is further provided on the first inclined surface 321, and the arc-extinguishing grid plate assembly 2 has a first arc-extinguishing grid plate 22 that is interference-fitted with the fastening groove 322. The first arc-extinguishing grid plate 22 is interference-fitted with the fastening groove 322.

[0107] Specifically, please combine Figure 6 , Figure 7 and Figure 10 In some embodiments of this application, the arc-extinguishing grid plate group 2 is fixedly connected to the mounting frame 1, and the arc-blocking part 32 is interference-fitted with the arc-extinguishing grid plate through the fastening groove 322 on the first inclined surface 321. In this way, the various components of the arc-extinguishing chamber can be assembled into an independent integral structure. When assembling the circuit breaker, the entire arc-extinguishing chamber can be installed with the base of the circuit breaker, thereby improving the installation efficiency.

[0108] It should be noted that the first arc-extinguishing grid 22 mentioned in this application does not refer to a single arc-extinguishing grid; it could also be two arc-extinguishing grids. For example, in Figure 10 In the arc-extinguishing grid assembly 2, two arc-extinguishing grid plates are interference-fitted with the fastening grooves 322 on the arc-isolating component 3. In other embodiments of this application, the number of fastening grooves 322 can be one or more, and the number of arc-extinguishing grid plates cooperating with one fastening groove 322 can be one or more. This application does not impose any restrictions on this.

[0109] Please continue to combine Figure 7 and Figure 10In some embodiments of this application, the first inclined surface 321 is further provided with a positioning plate 323 extending toward the arc-extinguishing grid assembly 2. The positioning plate 323 contacts the groove wall of at least some of the arc-extinguishing grids in the arc-extinguishing grid assembly 2, and is used to determine the mating position of the arc-extinguishing grid assembly 2 and the arc-blocking component 3 in the first direction D1.

[0110] Specifically, as mentioned above, at least one arc-extinguishing grid in the arc-extinguishing grid assembly 2 needs to be interference-fitted with the fastening groove 322 on the arc-isolating component 3. A positioning plate 323 extending towards the arc-extinguishing grid assembly 2 is also provided on the side of the arc-isolating component 3 facing the first side plate 11 and the second side plate 12. This positioning plate 323 contacts the groove wall of at least some of the arc-extinguishing grids in the arc-extinguishing grid assembly 2. Thus, when the arc-extinguishing grids are assembled with the arc-isolating component 3, the positioning plate 323 can determine the mating position of the arc-extinguishing grid assembly 2 and the arc-isolating component 3 in the first direction D1, facilitating the assembly of the arc-extinguishing grids and the arc-isolating component 3.

[0111] Please combine Figure 3 Figure 7 and Figure 10 In some embodiments of this application, one side of the positioning plate 323 is the groove wall of the receiving groove 31, and the other side of the positioning plate 323 is provided with a plug-in block, on which a fastening groove 322 is formed.

[0112] A positioning protrusion 324 is also provided on the side of the plug block away from the positioning plate 323. The positioning protrusion 324 is adapted to the groove wall 111B of the slot 111 of the first arc-extinguishing grid plate 22 on the mounting frame 1. The mounting frame 1 is plugged into the positioning protrusion 324 through the slot 111 of the first arc-extinguishing grid plate 22.

[0113] As mentioned above, the arc-extinguishing grid assembly 2 is fixedly connected to the mounting bracket 1, and the arc-blocking part 32 is interference-fitted with the first arc-extinguishing grid 22. In this way, the various components of the arc-extinguishing chamber can be assembled into an independent integral structure. On this basis, a positioning protrusion 324 is also provided on the side of the plug block away from the positioning plate 323. The mounting bracket 1 is plugged into the positioning protrusion 324 through the slot 111. In this way, the assembly reliability of the mounting bracket 1, the arc-extinguishing grid assembly 2, and the arc-blocking component 3 can be improved.

[0114] Please continue to refer to this. Figure 6 and Figure 7 In some embodiments of this application, the arc-blocking component 3 further includes a bottom 34, which is integrally disposed with the arc-blocking part 32 and the blocking part 33. Along the second direction D2, the bottom 34 extends away from the top plate 15 relative to the arc-blocking component 3 toward the first side plate 11 and the second side plate 12. The bottom 34 contacts the first side plate 11 and the second side plate 12, and supports the mounting frame 1 and the arc-extinguishing grid plate group 2 in the mounting frame 1.

[0115] Specifically, in this embodiment, the bottom 34 is integrally formed with the arc-isolating part 32 and the blocking part 33, and the bottom 34 can support the mounting frame 1 and the arc-extinguishing grid plate assembly 2 inside the mounting frame 1. When the arc-extinguishing chamber is being placed or removed, the bottom 34 can play a load-bearing role, preventing the arc-isolating component 3 from separating from the mounting frame 1 and the arc-extinguishing grid plate assembly 2 under the action of gravity, thereby improving the reliability of the arc-extinguishing chamber assembly structure.

[0116] Please continue to refer to this. Figure 3 In some embodiments of this application, multiple rows of slots 111 are symmetrically arranged on the opposite sides of the first side plate 11 and the second side plate 12. The arc-extinguishing grid plates are inserted into the slots 111 in a one-to-one correspondence.

[0117] In existing technologies, the connection between the arc-extinguishing grid and the first side plate 11' and the second side plate 12' is mostly achieved by riveting. In this embodiment, the arc-extinguishing grid is connected to the first side plate 11 and the second side plate 12 by plugging, which simplifies the arrangement of the arc-extinguishing grid.

[0118] Please combine Figure 6 , Figure 7 and Figure 9 In some embodiments of this application, the arc-extinguishing grid plates of the arc-extinguishing grid plate group 2 are inclined in a direction away from the top plate 15. The first arc-extinguishing grid plate 22 in the arc-extinguishing grid plate group 2 is interference-fitted with the fastening groove 322, and a portion of the remaining arc-extinguishing grid plates abut against the first inclined surface 321, and another portion abuts against the second inclined surface 331.

[0119] Specifically, in some embodiments of this application, the arc-extinguishing grid assembly 2 includes multiple arc-extinguishing grids, each with a cutting groove. When multiple arc-extinguishing grids are arranged, the arc-extinguishing grids of the arc-extinguishing grid assembly 2 are tilted away from the top plate 15, so that the bottom of the cutting grooves on the multiple arc-extinguishing grids are arranged generally along an arc direction, forming a cutting blade that matches the movement trajectory of the moving contact 4, thereby enhancing the arc cutting effect.

[0120] In this embodiment, at least one first arc-extinguishing grid plate 22 in the arc-extinguishing grid plate group 2 is interference-fitted with the fastening groove 322, and at least a portion of the remaining arc-extinguishing grid plates abut against the first inclined surface 321 and the second inclined surface 331. This prevents the arc-extinguishing grid plates inserted into the mounting bracket 1 from falling off, improving the reliability of the arc-extinguishing chamber.

[0121] Based on the same inventive concept, this application also provides a molded case circuit breaker, including any of the arc-extinguishing chambers described above. Its beneficial effects can be found in the description of the arc-extinguishing chamber and the beneficial effects of each possible implementation, and will not be repeated here.

[0122] 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.

[0123] 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 quenching chamber, characterized in that, Includes mounting brackets and arc-extinguishing grid assembly; The mounting bracket includes a first side plate, a second side plate, a first baffle, and a second baffle; Along the first direction, the first side plate and the second side plate are disposed opposite to each other; Along the second direction, the first baffle and the second baffle are disposed at the same end of the first side plate and the second side plate, thereby blocking the space between the first side plate and the second side plate; Along a third direction, the first baffle is disposed near the upper end of the first side plate and the second side plate, and a gas outlet is reserved between the baffle and the upper end; the second baffle is connected to the first baffle and extends to the lower end of the first side plate and the second side plate; the lower end is the end of the first side plate and the second side plate near the circuit breaker base when the arc-extinguishing chamber is installed, and the upper end is the other end of the first side plate and the second side plate opposite to the lower end. Both the first baffle and the second baffle are insulating boards, and the first baffle is a flexible board that is detachably connected to the first side plate and the second side plate; the first side plate, the second side plate and the second baffle are integrally formed. The arc-extinguishing grid assembly is fixedly installed in the space enclosed by the first side plate, the second side plate, the first baffle, and the second baffle, and the outlet of the arc-extinguishing grid assembly faces the first baffle, the second baffle, and the gas outlet; The first direction, the second direction, and the third direction are perpendicular to each other.

2. The arc chute of claim 1, wherein, The mounting frame also includes a top plate, and the arc-extinguishing chamber also includes an arc-isolating component; Along the third direction, the top plate is disposed at the upper end of the first side plate and the second side plate, thereby blocking the space between the first side plate and the second side plate; Along the second direction, the arc-blocking component is disposed at the arc inlet of the arc-extinguishing grid assembly and is in contact with the first side plate and the second side plate; The arc-blocking component is provided with a receiving groove that communicates with the arc inlet at the location opposite to the arc inlet. Along the first direction, the width of the receiving groove is smaller than the width of the arc inlet, and the moving contact and the stationary contact come into contact and separate in the receiving groove.

3. The arc chute of claim 2, wherein, Along the first direction, the outline of the main body of the arc-extinguishing grid assembly at one end of the arc inlet is a broken line, and the outline includes a first line segment and a second line segment connected to each other. Along the third direction, the arc-extinguishing grid plate corresponding to the first line segment is closer to the top plate, and the arc-extinguishing grid plate corresponding to the second line segment is relatively farther away from the top plate; Along the second direction, the end where the first line segment connects to the second line segment is farther from the first baffle relative to the other end of the first line segment and the other end of the second line segment; Along the first direction, the first side plate and the second side plate cover the arc-extinguishing grid assembly, and the outline of the first side plate and the second side plate at one end of the arc inlet is a polygonal shape adapted to the arc-extinguishing grid assembly; The arc-blocking component includes an integrally formed arc-blocking part and a blocking part. The arc-blocking part is disposed at the arc-extinguishing grid plate corresponding to the second line segment. The surface of the arc-blocking part that contacts the first side plate and the second side plate includes a first inclined surface adapted to the shape of the first side plate and the second side plate. The receiving groove is formed in the arc-blocking part. The blocking part is disposed at the arc-extinguishing grid plate corresponding to the first line segment. The blocking part is inclined relative to the arc-blocking part towards the top plate. The surface of the blocking part that contacts the first side plate and the second side plate is a second inclined surface that is adapted to the shape of the first side plate and the second side plate. The blocking part can cover the arc entrance at the location corresponding to the first line segment.

4. The arc chute of claim 3, wherein, The first inclined surface is also provided with a fastening groove, and the arc extinguishing grid plate group has a first arc extinguishing grid plate that is interference-fitted with the fastening groove; the first arc extinguishing grid plate is interference-fitted with the fastening groove.

5. The arc chute of claim 4, wherein, The first inclined surface is also provided with a positioning plate extending toward the arc-extinguishing grid assembly; The positioning plate contacts the groove wall of at least some of the arc-extinguishing grid plates in the arc-extinguishing grid plate group, and is used to determine the mating position of the arc-extinguishing grid plate group and the arc-blocking component in the first direction.

6. The arc chute of claim 5, wherein, One side of the positioning plate is the wall of the receiving groove, and the other side of the positioning plate is provided with a plug-in block, on which the fastening groove is formed; A positioning protrusion is also provided on the side of the plug block away from the positioning plate. The positioning protrusion is adapted to the groove wall of the slot of the first arc-extinguishing grid plate on the mounting frame. The mounting frame is plugged into the positioning protrusion through the slot of the first arc-extinguishing grid plate.

7. The arc-extinguishing chamber according to claim 4, 5, or 6, characterized in that, The arc-blocking component also includes a bottom, which is integrally formed with the arc-blocking part and the blocking part. Along the second direction, the bottom extends relative to the arc-blocking component towards the end of the first side plate and the second side plate away from the top plate. The bottom contacts the first side plate and the second side plate and supports the mounting frame and the arc-extinguishing grid plate assembly inside the mounting frame.

8. The arc chute according to claim 4 or 5 or 6, characterized in that Along the first direction, multiple rows of slots are symmetrically arranged on the opposite side of the first side plate and the second side plate; the arc-extinguishing grid plate is inserted into each slot in a one-to-one correspondence.

9. The arc chute of claim 8, wherein, Along the second direction, the arc-extinguishing grid plates of the arc-extinguishing grid plate assembly are inclined in a direction away from the top plate; The first arc-extinguishing grid plate is interference-fitted with the fastening groove, and a portion of the remaining arc-extinguishing grid plates abut against the first inclined surface, while another portion abuts against the second inclined surface.

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

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