Arc extinguish chamber and circuit breaker
By setting up a grid assembly in the arc extinguishing chamber, increasing the thickness of magnetic permeability at the grid legs and optimizing the grid spacing, the problem of slow arc transfer is solved, and the high current breaking ability and arc extinguishing effect are improved.
Patent Information
- Application Number
- CN202422311599.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-20
AI Technical Summary
When the arc extinguishing chamber of the existing circuit breaker is broken down with a large current, the arc transfer is slow and it cannot even enter the arc extinguishing chamber completely, affecting the arc extinguishing effect.
A grid assembly is provided in the arc extinguishing chamber. The thickness of the magnetic conduction material at the grid legs is greater than that of the abdomen of the grid, which increases the ferromagnetic content of the arc-guiding path space, forms an arc-guiding path space, and cooperates with the gas-generating assembly to optimize the grid spacing and thickness ratio and improve the arc transfer speed.
The breaking capacity of the arc extinguishing chamber under high current conditions is enhanced, the arc transfer speed is improved, and the arc extinguishing effect is ensured.
Smart Images
Figure CN223218248U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to an arc extinguishing chamber and a circuit breaker. Background Art
[0002] Arc extinguishing chambers are common components within circuit breakers, and using them to extinguish arcs is one of the fundamental methods of arc extinguishing. Typically, an arc extinguishing chamber consists of grids, gas-generating components, gas ducts, and gas outlets, with the metal grids stacked and arranged in a specific pattern. When an arc forms between the contacts, magnetic and gas blowing forces the arc into the grids, splitting the long arc into multiple shorter segments. This increases the arc voltage, reducing the fault current and extinguishing the arc effectively. However, existing circuit breaker arc extinguishing chambers suffer from slow arc transfer, or even the inability of the arc to enter the chamber when interrupting high currents, compromising the arc extinguishing effectiveness of the chamber. Utility Model Content
[0003] The purpose of this application is to provide an arc extinguishing chamber and a circuit breaker to address the deficiencies in the above-mentioned prior art, which can increase the arc transfer speed and enhance the breaking capacity.
[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:
[0005] According to one aspect of an embodiment of the present application, an arc extinguishing chamber is provided, wherein a grid assembly is provided in the arc extinguishing chamber, wherein the grid assembly is located on the opposite side of a moving contact assembly along a first direction, wherein the grid assembly includes at least one grid, wherein the grid includes a grid leg close to the moving contact assembly and a grid belly away from the moving contact assembly, wherein the thickness of the magnetic conductive material at the grid leg is greater than the thickness of the grid belly.
[0006] Optionally, along the thickness direction, the grid legs of the grid include at least two layers, and the total thickness of the at least two layers of magnetic conductive material at the grid legs is greater than the thickness of the grid belly; or, along the thickness direction, a thickening part is further provided on one side of the grid leg, and the total thickness of the magnetic conductive material at the grid legs and the thickening part is greater than the thickness of the grid belly.
[0007] Optionally, the grid leg is bent along the thickness direction, and the thickness of the magnetic conductive material at the bent grid leg is greater than the thickness of the grid belly.
[0008] Optionally, the grid legs and the grid belly are integrally arranged so that the thickness of the magnetic conductive material at the grid legs is greater than the thickness of the grid belly.
[0009] Optionally, an arc guide path space is formed between the grid assembly and the moving contact assembly, and gas-generating components are respectively provided on both sides of the arc guide path space along the second direction, and the second direction, the first direction and the thickness direction are perpendicular to each other; at least 80% of the area of the grid leg is located in the area covered by the gas-generating components.
[0010] Optionally, the grid plate assembly includes at least two grid plates, and the ratio of the spacing between the core portions of the at least two grid plates to the thickness of the core portions of the grid plates is ≥2.
[0011] Optionally, the grid plate assembly includes a plurality of grid plates, and the grid plate legs of the plurality of grid plates extend toward the moving contact assembly, so that the grid plate assembly forms an inverted convex U-shaped arrangement in the first direction.
[0012] Optionally, the grid legs are bent to form a V-shape at an acute angle or to form a U-shape in parallel.
[0013] Optionally, the arc extinguishing chamber further includes a support member, and the arc extinguishing chamber forms a semi-enclosed space with an opening through the support member, and the opening faces the moving contact assembly. The grid assembly and the gas generating assembly are located in the semi-enclosed space and fixed on the support member.
[0014] Another aspect of an embodiment of the present application provides a circuit breaker, comprising a moving contact assembly and the arc extinguishing chamber described above, wherein the opening of the arc extinguishing chamber faces the moving contact assembly, and the grid assembly in the arc extinguishing chamber is arranged opposite to the moving contact assembly.
[0015] The beneficial effects of this application include:
[0016] The present application provides an arc extinguishing chamber and a circuit breaker, wherein an arc guide path space is formed between the grid assembly and the moving contact assembly, the thickness of the magnetic conductive material at the grid legs is increased, and the grid legs are located in the arc guide path space, thereby increasing the ferromagnetic content of the arc guide path space, that is, increasing the magnetic blowing force of the arc guide path space, making it easier for the arc generated by the breaking of the moving contact assembly to enter the grid assembly, thereby increasing the arc transfer speed, enhancing the breaking capacity of the arc extinguishing chamber under high current conditions, and ensuring the arc extinguishing effect of the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0018] Figure 1A schematic diagram of the coordination of an arc extinguishing chamber and a moving contact assembly provided in an embodiment of the present application;
[0019] Figure 2 This is one of the structural schematic diagrams of an arc extinguishing chamber provided in an embodiment of the present application;
[0020] Figure 3 This is a second structural diagram of an arc extinguishing chamber provided in an embodiment of the present application;
[0021] Figure 4 A schematic structural diagram of an arc extinguishing chamber grid assembly provided in an embodiment of the present application;
[0022] Figure 5 This is one of the schematic diagrams of the grid structure of an arc extinguishing chamber provided in an embodiment of the present application;
[0023] Figure 6 This is a second schematic diagram of an arc extinguishing chamber grid structure provided in an embodiment of the present application;
[0024] Figure 7 This is a third schematic diagram of the arc extinguishing chamber grid structure provided in an embodiment of the present application.
[0025] Icons: 10-arc extinguishing chamber; 10a-support member; 11-grid assembly; 110-grid; 11a-grid belly; 11b-grid leg; 11c-grid notch; 11d-thickening member; 12-gas generating assembly; 21-moving contact assembly; F1-first direction; F2-second direction; T-thickness direction; Ta, Tb-thickness. DETAILED DESCRIPTION
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application as claimed, but merely represents selected embodiments of the present application. It should be noted that, unless there is a conflict, the various features of the embodiments of the present application may be combined with each other, and the combined embodiments are still within the scope of protection of the present application.
[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.
[0031] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0032] When the existing arc extinguishing chamber 10 is tested, the arc cannot completely enter the grid 110, and only ablation marks are left at the edge of the grid 110, resulting in a poor arc extinguishing effect.
[0033] In one aspect of the embodiment of the present application, referring to Figure 1 、 Figure 2 , an arc extinguishing chamber 10 is provided, wherein a grid assembly 11 is disposed in the arc extinguishing chamber 10, and the grid assembly 11 is located on the opposite side of the moving contact assembly 21 along the first direction F1. The grid assembly 11 includes at least one grid 110, and the grid 110 includes a grid leg 11b close to the moving contact assembly 21 and a grid belly 11a away from the moving contact assembly 21. The thickness Tb of the magnetic conductive material at the grid leg 11b is greater than the thickness Ta of the grid belly 11a.
[0034] Specifically, if Figure 3As shown, the arc extinguishing chamber 10 includes a support member 10a, which can be regarded as a side wall of the arc extinguishing chamber 10. The arc extinguishing chamber 10 forms a semi-enclosed space with an opening through the support member 10a, and the grid assembly 11 is located in the semi-enclosed space; the opening of the arc extinguishing chamber 10 faces the moving contact assembly 21, so that the arc generated by the disconnection of the moving contact assembly 21 can enter the grid assembly 11 in the arc extinguishing chamber 10 through the opening for arc extinguishing.
[0035] The grid assembly 11 is made of magnetic conductive material and includes at least one grid 110. The grid 110 includes grid legs 11b and a grid belly 11a, wherein the grid belly 11a is away from the moving contact assembly 21, and the grid legs 11b are close to the moving contact assembly 21. The thickness Tb of the magnetic conductive material at the grid legs 11b is greater than the thickness Ta of the grid belly 11a.
[0036] An arc guide path space is formed between the grid assembly 11 and the moving contact assembly 21. In this application, the thickness Tb of the magnetic material at the grid leg 11b (the thickness Tb below refers to the thickness at the grid leg 11b where the magnetic material is provided) is increased, and the grid leg 11b is located in the arc guide path space, which increases the ferromagnetic content of the arc guide path space, that is, increases the magnetic blowing force of the arc guide path space, so that the arc generated by the breaking of the moving contact assembly 21 can more easily enter the grid assembly 11, thereby increasing the arc transfer speed, enhancing the breaking capacity of the arc extinguishing chamber 10 under high current conditions, and ensuring the arc extinguishing effect of the arc extinguishing chamber 10.
[0037] Regarding the relationship between the thickness Tb of the grid legs 11b and the thickness Ta of the grid belly 11a, the present application can be implemented in different ways. In some embodiments, along the thickness direction T, the grid legs 11b of the grid 110 include at least two layers (not shown in the figure), and the total thickness Tb of the magnetic conductive material at the at least two layers of grid legs 11b is greater than the thickness Ta of the grid belly 11a.
[0038] For example, a single-layer grid leg 11b has the same thickness as the grid abdomen 11a. When the grid leg 11b has at least two layers, it is equivalent to placing at least one other grid leg 11b made of the same material next to the single-layer grid leg 11b. In this way, the total thickness Tb of the magnetic conductive material at at least two layers of grid legs 11b is greater than the thickness Ta of the grid abdomen 11a.
[0039] In other embodiments, Figure 5 As shown, along the thickness direction T, the grid leg 11b is bent, and the total thickness Tb of the magnetic conductive material at the bent grid leg 11b is greater than the thickness Ta of the grid abdomen 11a.
[0040] For example, the single-layer grid leg 11b has the same thickness as the grid belly 11a. Bending the grid leg 11b along the thickness direction T is equivalent to forming two layers of grid legs 11b to increase the total thickness Tb of the grid legs 11b at the bending position. In this way, the total thickness Tb of the grid legs 11b at the bending position is greater than the thickness Ta of the grid belly 11a.
[0041] Furthermore, the bent grid legs 11b are formed into a V-shape at an acute angle or into a U-shape when they are parallel. Figure 5 In the embodiment, the two layers of grid legs 11b are parallel to each other after being bent to form a U shape; in other examples, the two layers of grid legs 11b are arranged at an acute angle to form a V shape after being bent, and the specific arrangement is based on actual needs.
[0042] In some other embodiments, Figure 6 As shown, the grid legs 11b and the grid abdomen 11a are integrally provided, so that the thickness Tb of the magnetic conductive material at the grid legs 11b is greater than the thickness Ta of the grid abdomen 11a.
[0043] When processing the grid 110, the magnetic material at the grid legs 11b is thickened, or the grid belly 11a is thinned. After the grid 110 is formed as one piece, the thickness Tb of the magnetic material at the grid legs 11b is greater than the thickness Ta of the grid belly 11a.
[0044] You can also Figure 7 In an embodiment, the grid leg 11b is a flat plate structure, and a separate thickening member 11d is provided on the grid leg 11b, which can generally be an iron block. The total thickness between the thickening member 11d and the grid leg 11b (including the gap between the thickening member 11d and the grid leg 11b) is thickness Tb, and thickness Tb is greater than thickness Ta of the grid belly 11a.
[0045] It should be noted that the thickness Tb in the above embodiments is the total thickness including the gaps between components in the thickness direction T. For details, please refer to the drawings of each embodiment.
[0046] Furthermore, if Figure 2 、 Figure 3 As shown, gas generating components 12 are respectively provided on both sides of the arc guide path space along the second direction F2 , and the second direction F2 is perpendicular to the first direction F1 ; at least 80% of the area of the grid leg 11 b is located in the area covered by the gas generating components 12 .
[0047] The gas-generating component 12 and the grid component 11 are used together to extinguish the arc. The gas-generating component 12 is made of suitable materials and can produce a large amount of gas after arc erosion, thereby increasing the pressure in the arc extinguishing chamber 10 and forming a pressure difference with the outside. Finally, gas blowing is formed on the arc through the gas outlet of the arc extinguishing chamber 10, thereby achieving the effect of arc extinguishing.
[0048] In the present application, the grid leg 11b of the grid 110 extends toward the moving contact assembly 21, and the gas-generating assembly 12 and the grid 110 have an overlapping area. At least 80% of the area of the grid leg 11b is covered by the gas-generating assembly 12. In this way, the overlapping area between the grid leg 11b and the gas-generating assembly 12 is greatly increased, which is conducive to rapid arc extinguishing.
[0049] In the first direction F1 , the grid assembly 11 is located above the gas generating assembly 12 . The grid assembly 11 and the gas generating assembly 12 are located in a semi-enclosed space and are fixed to the inner wall of the support member 10 a in cooperation with each other.
[0050] When the grid plate assembly 11 includes at least two grid plates 110 , the ratio of the interval between the grid plate abdomens 11 a of the at least two grid plates 110 to the thickness of the grid plate abdomens 11 a of the grid plates 110 is ≥2.
[0051] The ratio of the spacing between the grid plate abdomens 11a of adjacent grid plates 110 to the thickness Ta of the grid plate abdomen 11a is set to be ≥2, thereby increasing the spacing between the grid plate abdomens 11a to reduce flow resistance, and at the same time increasing the content of iron material in the arc guide path space to increase the magnetic blowing force and accelerate arc transfer.
[0052] As the spacing between the grid abdomen 11a increases, the iron content density on both sides of the arc guide path space decreases, resulting in a weakening of the magnetic blowing force in the arc guide path space. By increasing the thickness Tb of the magnetic material at the grid leg 11b, the ferromagnetic content in the arc guide path space is increased, the magnetic blowing force is increased, and the arc is easier to enter the grid 110.
[0053] The grid assembly 11 includes a plurality of grids 110 . The grid legs 11 b of the plurality of grids 110 extend toward the moving contact assembly 21 , so that the grid assembly 11 is arranged in an inverted U-shape in the first direction F1 .
[0054] Figure 3 、 Figure 4 In the figure, multiple grid plates 110 are arranged along the thickness direction T, and the grid plates 110 located in the middle area of the thickness direction T have grid plates legs 11b closer to the moving contact assembly 21, and the grid plates legs 11b of the grid plates 110 located in the two side areas are farther away from the moving contact assembly 21. In this way, the multiple grid plates 110 form an inverted convex shape toward the moving contact assembly 21. Part of the arc generated by the breaking of the moving contact assembly 21 first enters the grid plates 110 in the middle area closer to the moving contact assembly 21, and the other part of the arc then enters the grid plates 110 in the two side areas, making it easy for the arc to enter the grid plates 110, thereby increasing the overall transfer speed of the arc.
[0055] The grid plates 110 have grid notches 11c protruding toward the grid abdomen 11a at the connection positions of the grid legs 11b and the grid abdomen 11a. When multiple grid plates 110 are arranged in sequence along the thickness direction T, the grid notches 11c of adjacent grid plates 110 are staggered.
[0056] As shown in FIG5 , the grid plate 110 has two grid plate legs 11b, which intersect upward along the first direction F1 and connect to the grid plate abdomen 11a. A grid plate notch 11c is formed at the intersection of the grid plate abdomen 11a and the grid plate legs 11b. The grid plate notch 11c protrudes toward the grid plate abdomen 11a. The shape and position of the grid plate notch 11c of each grid plate 110 may be different. For example, Figure 5 The deeper grid slots 11c shown can also form Figure 6 The shallower grid slots 11c are shown.
[0057] In order to better cut and receive the arc, when multiple grid plates 110 are arranged along the thickness direction T, the grid plate slots 11c of adjacent grid plates 110 are staggered. Compared with the existing method of arranging adjacent grid plates 110 of the same specification, the staggered arrangement of adjacent grid plates 110 in the present application makes it easier for the arc to be cut by the grid plates 110 when the number of grid plates 110 arrays increases under high-voltage working conditions.
[0058] In summary, the arc extinguishing chamber 10 of the embodiment of the present application reduces the flow resistance by increasing the grid spacing, and at the same time increases the iron content in the arc guide path space to increase the magnetic blowing force by setting the thickness Tb of the magnetic conductive material at the grid leg 11b to be greater than the thickness Ta of the grid belly 11a; optimizes the ratio of the grid spacing and the thickness of the grid 110, takes into account the heat capacity and flow resistance of the grid 110, makes it easier for the arc to enter the grid 110 and ensures the structural stability of the grid 110, thereby improving the arc transfer speed and enhancing the breaking capacity.
[0059] On the other hand, an embodiment of the present application also discloses a circuit breaker, comprising a moving contact assembly 21 and an arc extinguishing chamber 10 as described above, wherein the opening of the arc extinguishing chamber 10 faces the moving contact assembly 21, and the grid assembly 11 in the arc extinguishing chamber 10 is arranged opposite to the moving contact assembly 21.
[0060] The moving contact assembly 21 and the static contact assembly cooperate to realize opening and closing. The moving contact assembly 21 and the static contact assembly are disconnected to generate an arc, and the arc enters the grid 110 in the arc extinguishing chamber 10 through the opening of the arc extinguishing chamber 10 to realize arc extinguishing.
[0061] The circuit breaker includes the same structure and benefits as the arc extinguishing chamber 10 in the aforementioned embodiment. The structure and benefits of the arc extinguishing chamber 10 have been described in detail in the aforementioned embodiment and will not be repeated here.
[0062] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.
Claims
1. An arc extinguishing chamber, characterized in that: A grid assembly (11) is provided in the arc extinguishing chamber (10), the grid assembly (11) is located on the opposite side of the moving contact assembly (21) along a first direction (F1), the grid assembly (11) includes at least one grid (110), the grid (110) includes a grid leg (11b) close to the moving contact assembly (21) and a grid belly (11a) away from the moving contact assembly (21), and the thickness (Tb) of the magnetic conductive material at the grid leg (11b) is greater than the thickness (Ta) of the grid belly (11a).
2. The arc extinguishing chamber according to claim 1, characterized in that: In the thickness direction (T), the grid leg (11b) of the grid (110) comprises at least two layers, and the total thickness (Tb) of the magnetic conductive material at the at least two layers of the grid leg (11b) is greater than the thickness (Ta) of the grid abdomen (11a); Alternatively, along the thickness direction (T), a thickening member (11d) is further provided on one side of the grid leg (11b), and the total thickness (Tb) of the magnetic conductive material at the grid leg (11b) and the thickening member (11d) is greater than the thickness (Ta) of the grid abdomen (11a).
3. The arc extinguishing chamber according to claim 1, characterized in that: In the thickness direction (T), the grid leg (11b) is bent, and the thickness (Tb) of the magnetic conductive material at the bent grid leg (11b) is greater than the thickness (Ta) of the grid abdomen (11a).
4. The arc extinguishing chamber according to claim 1, characterized in that: The grid leg (11b) and the grid belly (11a) are integrally arranged so that the thickness (Tb) of the magnetic conductive material at the grid leg (11b) is greater than the thickness (Ta) of the grid belly (11a).
5. The arc extinguishing chamber according to any one of claims 1 to 4, characterized in that: An arc-guiding path space is formed between the grid assembly (11) and the moving contact assembly (21), and gas-generating assemblies (12) are respectively provided on both sides of the arc-guiding path space along a second direction (F2), wherein the second direction (F2), the first direction (F1) and the thickness direction (T) are perpendicular to each other; and at least 80% of the area of the grid leg (11b) is located in the area covered by the gas-generating assemblies (12).
6. The arc extinguishing chamber according to any one of claims 1 to 4, characterized in that: The grid plate assembly (11) comprises at least two grid plates (110), and the ratio of the distance between the grid plate abdomens (11a) of the at least two grid plates (110) to the thickness (Ta) of the grid plate abdomens (11a) of the grid plates (110) is ≥2.
7. The arc extinguishing chamber according to any one of claims 1 to 4, characterized in that: The grid plate assembly (11) comprises a plurality of grid plates (110), wherein the grid plate legs (11b) of the plurality of grid plates (110) extend toward the moving contact assembly (21), so that the grid plate assembly (11) forms an inverted convex-shaped arrangement in the first direction (F1).
8. The arc extinguishing chamber according to claim 3, characterized in that: The grating legs (11b) are bent to form a V shape at an acute angle or to form a U shape in parallel.
9. The arc extinguishing chamber according to claim 5, characterized in that: The arc extinguishing chamber (10) further comprises a support member (10a), wherein the arc extinguishing chamber (10) forms a semi-enclosed space having an opening through the support member (10a), wherein the opening faces the moving contact assembly (21), and the grid assembly (11) and the gas generating assembly (12) are located in the semi-enclosed space and fixed on the support member (10a).
10. A circuit breaker, characterized in that: The invention comprises a moving contact assembly (21) and an arc extinguishing chamber (10) according to any one of claims 1 to 9, wherein the opening of the arc extinguishing chamber (10) faces the moving contact assembly (21), and the grid assembly (11) in the arc extinguishing chamber (10) is arranged opposite to the moving contact assembly (21).