Arc extinguish chamber and circuit breaker
By designing an arc extinguishing chamber with arc-induced plate and arc-separating plate in the circuit breaker, the problem of arc escape is solved, and a stronger arc extinguishing effect and protection of circuit breaker components is achieved.
Patent Information
- Application Number
- CN202421438596.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The arc extinguishing chamber in the existing circuit breaker is prone to arc escape during the arc extinguishing process, causing the circuit breaker components to be ablated and affecting the normal use of the equipment.
An arc extinguishing chamber is designed, including an arc extinguishing cover, a first arc-displacement plate and a second arc-displacement plate. By setting up an arc-induced plate and an arc-displacement grid set, the arc is blocked by the arc-displacement plate after entering the arc extinguishing chamber, reducing the probability of arc egress.
It effectively reduces the probability of arc escape during arc extinguishing, enhances the arc extinguishing effect of the arc extinguishing chamber, protects the components of the circuit breaker, and ensures the normal operation of the equipment.
Smart Images
Figure CN222813539U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic equipment, and in particular to an arc extinguishing chamber and a circuit breaker. Background Art
[0002] Circuit breakers are generally used in various low-voltage power systems to connect and disconnect currents in power systems and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. When the moving contact and the stationary contact in the circuit breaker are in contact or disconnected, an arc will be generated between the moving contact and the stationary contact, and the arc will burn the components in the circuit breaker. Therefore, an arc extinguishing chamber is set in the circuit breaker, and the arc is extinguished after entering the arc extinguishing chamber to avoid damage to the circuit breaker by the arc.
[0003] In the related art, arc leakage may occur in the arc extinguishing chamber during the arc extinguishing process. The leaking arc may burn other components in the circuit breaker, making the circuit breaker unable to be used normally. Utility Model Content
[0004] The present application provides an arc extinguishing chamber and a circuit breaker, which reduce the probability of arc escape during the arc extinguishing process, thereby enhancing the arc extinguishing effect of the arc extinguishing chamber.
[0005] In a first aspect, the present application provides an arc extinguishing chamber for extinguishing an arc at a stationary contact. The arc extinguishing chamber comprises: an arc extinguishing hood, a first arc ignition plate and a second arc ignition plate. The arc extinguishing hood comprises an arc extinguishing portion, an arc striking plate, a first mounting portion and a second mounting portion. The arc extinguishing portion is close to the stationary contact on a first side along a first direction, and the first direction is a height direction of the arc extinguishing portion. The arc striking plate is close to the second side of the arc extinguishing portion along the first direction. The first mounting portion and the second mounting portion are respectively arranged at two ends of the arc extinguishing hood along a second direction, and the second direction is perpendicular to the first direction. The first arc ignition plate is connected to the first mounting portion. The second arc ignition plate is connected to the second mounting portion. The stationary contact and the arc striking plate are both located between the first arc ignition plate and the second arc ignition plate. The first arc ignition plate covers one side of the stationary contact and the arc striking plate in the second direction. The second arc ignition plate covers the other side of the stationary contact and the arc striking plate in the second direction.
[0006] According to the first aspect, in the present application, the arc extinguishing portion of the arc extinguishing chamber is placed close to the static contact of the circuit breaker along the first side of the first direction, so that the arc around the static contact can enter the arc extinguishing chamber through the top of the arc extinguishing portion. The arc striking plate is placed close to the second side of the arc extinguishing portion along the first direction, so that the arc can enter the arc extinguishing chamber through the bottom of the arc extinguishing portion. The first arc-isolating plate and the second arc-isolating plate are respectively arranged on both sides of the arc extinguishing chamber along the second direction, so that the static contact and the arc-isolating plate are both located between the first arc-isolating plate and the second arc-isolating plate. And the first arc-isolating plate and the second arc-isolating plate cover the static contact and the arc-isolating plate in the second direction, so that the first arc-isolating plate and the second arc-isolating plate can block the arc during the arc extinguishing process, reducing the probability of arc escape during the arc extinguishing process.
[0007] In a possible design, the first arc isolation plate and the second arc isolation plate are made of polyamide or polyoxymethylene, so that the first arc isolation plate and the second arc isolation plate release arc extinguishing gas after being heated.
[0008] Based on the description of the above embodiments, the material of the first arc isolation plate and the second arc isolation plate can be polyamide material or polyoxymethylene material, so that the first arc isolation plate and the second arc isolation plate release arc extinguishing gas after being heated, thereby accelerating the arc extinguishing speed and further enhancing the arc extinguishing effect of the arc extinguishing chamber.
[0009] In a possible design, the arc extinguishing portion includes an arc extinguishing grid group and a grid support. The arc extinguishing grid group includes a plurality of arc extinguishing grids stacked along the first direction. A Y-shaped arc striking groove is provided on the side of each arc extinguishing grid close to the stationary contact. The grid support includes a first side plate and a second side plate. The first side plate is arranged on one side of the arc extinguishing grid group along the second direction. The second side plate is arranged on the other side of the arc extinguishing grid group along the second direction. One end of each arc extinguishing grid is fixed to the first side plate. The other end of each arc extinguishing grid is fixed to the second side plate.
[0010] Based on the description of the above embodiment, the arc extinguishing grid group in the arc extinguishing part includes a plurality of arc extinguishing grids stacked along a first direction. A Y-shaped arc striking groove is provided on a side of each arc extinguishing grid close to the stationary contact, so that the arc can enter the arc extinguishing grid more easily, thereby improving the arc extinguishing effect of the arc extinguishing chamber. The grid support may include a first side plate and a second side plate arranged opposite to each other along a second direction. The first side plate and the second side plate can both fix the arc extinguishing grid, so that the arc extinguishing grid is relatively stable in the circuit breaker to ensure the arc extinguishing effect of the arc extinguishing grid.
[0011] In a possible design, the first mounting portion is the first side plate, the second mounting portion is the second side plate, the first arc isolation plate is connected to the first side plate, and the second arc isolation plate is connected to the second side plate.
[0012] In a possible design, the arc-extinguishing grid has a first end extending toward the first arc-isolating plate. The arc-extinguishing grid has a second end extending toward the second arc-isolating plate. The first mounting portion is the first end, and the second mounting portion is the second end. The first arc-isolating plate is connected to the first end. The second arc-isolating plate is connected to the second end.
[0013] In summary, the operator can select the above two matching methods according to the needs, so that the first arc isolation plate is connected to the first mounting portion, and the second arc isolation plate is connected to the second mounting portion.
[0014] In a possible design, a first mounting groove is provided on a side of the first arc isolation plate facing the arc extinguishing cover. A second mounting groove is provided on a side of the second arc isolation plate facing the arc extinguishing cover. The first mounting groove is sleeved on the first mounting portion. The second mounting groove is sleeved on the second mounting portion.
[0015] Based on the description of the above embodiment, by sleeve-mounting the first mounting groove of the first partition plate on the first mounting portion, and sleeve-mounting the second mounting groove of the second partition plate on the second mounting portion, the first arc isolation plate and the second arc isolation plate can be positioned so that the first arc isolation plate and the second arc isolation plate can stably play the role of blocking arc escape during the arc extinguishing process.
[0016] In a possible design, a first boss is provided in the first mounting groove. When the first mounting groove is sleeved on the first mounting portion, the first boss abuts against the first mounting portion. A second boss is provided in the second mounting groove. When the second mounting groove is sleeved on the second mounting portion, the second boss abuts against the second mounting portion.
[0017] Based on the description of the above embodiment, the first boss provided in the first mounting groove abuts against the first mounting groove, and the second boss provided in the second mounting groove abuts against the second mounting groove. The first arc isolation plate is connected to the first mounting portion by interference, and the second arc isolation plate is connected to the second mounting portion by interference. Based on this, the first arc isolation plate and the second arc isolation plate are fully positioned, and the stability of the first arc isolation plate and the second arc isolation plate during the arc extinguishing process can be further improved.
[0018] In a possible design, two first bosses are disposed in the first installation groove, and two second bosses are disposed in the second installation groove.
[0019] Based on the description of the above embodiment, two first bosses are provided in the first mounting groove, which increases the stability of the connection between the first arc isolation plate and the first mounting portion, and can prevent the first arc isolation plate from being over-positioned with the first mounting portion. Similarly, two second bosses are provided in the second mounting groove, which increases the stability of the connection between the second arc isolation plate and the second mounting portion, and can prevent the second arc isolation plate from being over-positioned with the second mounting portion.
[0020] In a possible design, a first chamfer is provided at the opening of the first mounting groove. A second chamfer is provided at the opening of the second mounting groove. A first inclined surface is provided on the side of the first boss facing the first mounting portion. A second inclined surface is provided on the side of the second boss facing the second mounting portion. The first chamfer cooperates with the first inclined surface. The second chamfer cooperates with the second inclined surface.
[0021] Based on the description of the above embodiment, the first chamfer of the first mounting groove matches the first inclined surface of the first boss, and the second chamfer of the second mounting groove matches the second inclined surface of the second boss, which plays a role in guiding the installation of the first arc isolation plate and the second arc isolation plate. At the same time, the difficulty of assembling the first arc isolation plate and the second arc isolation plate is reduced.
[0022] In a second aspect, the present application provides a circuit breaker, comprising: a housing, a moving contact, a stationary contact, and an arc extinguishing chamber as described in any one of the above embodiments. The housing has a receiving cavity, and the moving contact, the stationary contact, and the arc extinguishing chamber are all arranged in the receiving cavity. The moving contact is rotatably connected in the housing. The stationary contact is arranged on the rotation track of the moving contact, and an arc is generated when the moving contact contacts the stationary contact. The arc extinguishing chamber is close to the stationary contact and is used to extinguish the arc.
[0023] The beneficial effects of the circuit breaker provided in the second aspect can be referred to the beneficial effects brought about by the first aspect and the possible implementation methods of the first aspect, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] 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 description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0025] Figure 1 It is a schematic diagram of a circuit breaker cover body exploding along the second direction in an embodiment of the present application.
[0026] Figure 2 This is a schematic diagram of the arc extinguishing chamber exploding along the second direction in an embodiment of the present application.
[0027] Figure 3 It is a structural schematic diagram of a hidden cover of a circuit breaker in an embodiment of the present application.
[0028] Figure 4 This is a schematic diagram of the first structure of the arc extinguishing part in the embodiment of the present application.
[0029] Figure 5 This is a schematic diagram of the second structure of the arc extinguishing part in the embodiment of the present application.
[0030] Figure 6 It is a structural schematic diagram of the first arc isolation plate and the second arc isolation plate in an embodiment of the present application.
[0031] Figure 7 for Figure 6 Magnified view of section A.
[0032] Description of reference numerals:
[0033] 100-circuit breaker;
[0034] 1-arc extinguishing chamber;
[0035] 11-arc extinguishing cover; 11-arc extinguishing part; 111-arc extinguishing grid; 111a-first end; 111b-second end; 1111-arc striking groove; 112-grid support; 1121-first side plate; 1122-second side plate; 12-arc striking plate;
[0036] 13-first arc isolation plate; 131-first mounting groove; 1311-first chamfer; 132-first boss; 1321-first inclined surface;
[0037] 14-second arc isolation plate; 141-second mounting groove; 1411-second chamfer; 142-second boss; 1421-first inclined surface;
[0038] 2-static contact; 3-moving contact; 4-housing; 41-base; 42-cover;
[0039] X-first direction; Y-second direction. DETAILED DESCRIPTION
[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0042] The terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.
[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0044] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0045] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. For example, in the description of the present application, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.
[0046] In addition, the expressions of the indicated directions, such as the X direction, the Y direction, and the Z direction, used to illustrate the operation and construction of the components of the present embodiment are not absolute but relative, and although these indications are appropriate when the components of the battery pack are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.
[0047] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned 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.
[0048] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).
[0049] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection may also be an integral connection, such as welding, bonding or integral molding to form a connection for connection. The "connection" or "connection" of a circuit structure may refer to an electrical connection or a signal connection in addition to a physical connection. For example, it may be a direct connection, that is, a physical connection, or it may be an indirect connection through at least one intermediate element, as long as the circuit is connected, or it may be the internal connection of two elements; the signal connection may refer to a signal connection through a media medium, such as a radio wave, in addition to a signal connection through a circuit. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0050] like Figure 1 As shown, the circuit breaker 100 may include a housing 4, an operating mechanism, a contact system, a release and other parts.
[0051] The housing 4 may include a base 41 and a cover 42 , and the base 41 and the cover 42 are buckled together to form an accommodating cavity, so that the operating mechanism, the contact system, the releaser and other parts are all arranged in the above-mentioned accommodating cavity.
[0052] The contact system may include a moving contact 3 and a stationary contact 2. The moving contact 3 is rotatably connected in the housing 4, and the stationary contact 2 is arranged on the rotation track of the moving contact 3, so that the moving contact 3 will contact the stationary contact 2 when rotating. When the circuit works normally, the moving contact 3 contacts the stationary contact 2, and the current passes through the contact system to keep the circuit breaker 100 in a closed state. When a circuit fault occurs, such as a short circuit or overload, the trip device of the circuit breaker 100 will sense it and quickly disconnect the moving contact 3 from the stationary contact 2, cut off the current, and prevent the occurrence of fire or other safety accidents.
[0053] During the contact and disconnection process between the static contact 2 and the moving contact 3, an arc will be generated between the static contact 2 and the moving contact 3. The arc will burn the contact system and affect the flow of current in the contact system. Therefore, it is necessary to set an arc extinguishing system in the circuit breaker 100 to extinguish the arc.
[0054] Among them, Figure 1 As shown, the arc extinguishing system may be an arc extinguishing chamber 1, and the arc needs to enter the arc extinguishing chamber 1 for arc extinguishing. During the arc extinguishing process of the arc extinguishing chamber 1, part of the arc may escape from the arc extinguishing chamber 1. When the arc escapes and contacts other components in the circuit breaker 100, it will burn other components, thereby causing damage to the circuit breaker 100.
[0055] In order to prevent the arc from escaping during the process of entering the arc extinguishing chamber 1 as much as possible, the embodiment of the present application provides an arc extinguishing chamber 1 and a circuit breaker 100, by arranging a first arc isolation plate 13 and a second arc isolation plate 14 between the static contact 2 and the arc striking plate 12, so that the arc is blocked by the arc isolation plate during the process of passing through the arc striking plate 12 into the arc extinguishing chamber 1, thereby reducing the probability of arc escaping. Figure 1-7 Provide detailed explanation.
[0056] like Figure 1-Figure 3 As shown, the present application provides an arc extinguishing chamber 1 for extinguishing an arc in a circuit breaker 100. The arc extinguishing chamber 1 includes: an arc extinguishing hood, a first arc isolation plate 13 and a second arc isolation plate 14. The arc extinguishing hood includes an arc extinguishing portion 11, an arc striking plate 12, a first mounting portion and a second mounting portion. The arc extinguishing portion 11 is close to the static contact 2 on a first side along a first direction X, and the first direction X is the height direction of the arc extinguishing portion 11. The arc striking plate 12 is close to the second side of the arc extinguishing portion 11 along the first direction X. The first mounting portion and the second mounting portion are respectively arranged at two ends of the arc extinguishing hood along a second direction Y, and the second direction Y is perpendicular to the first direction X. The first arc isolation plate 13 is connected to the first mounting portion. The second arc isolation plate 14 is connected to the second mounting portion. The static contact 2 and the arc striking plate 12 are both located between the first arc isolation plate 13 and the second arc isolation plate 14. The first arc isolation plate 13 covers one side of the static contact 2 and the arc striking plate 12 in the second direction Y. The second arc isolation plate 14 covers the other side of the stationary contact 2 and the arc striking plate 12 in the second direction Y.
[0057] The arc extinguishing hood may have a cavity structure, and the arc is extinguished in the cavity of the arc extinguishing hood.
[0058] like Figure 1 As shown, the installation position of the static contact 2 in the circuit breaker 100 is relatively fixed, and the moving contact 3 rotates to the vicinity of the static contact 2 and contacts the static contact 2. Therefore, the arc generated when the moving contact 3 contacts or disconnects with the static contact 2 is generally generated around the static contact 2. According to the above content, it can be known that the arc enters the arc extinguishing cover from around the static contact 2.
[0059] Specifically, Figure 2 As shown, the arc extinguishing hood may include an arc extinguishing portion 11, an arc striking plate 12, a first mounting portion and a second mounting portion.
[0060] The arc extinguishing portion 11 may be an arc extinguishing grid group, which is used to extinguish the arc entering the arc extinguishing cover.
[0061] Further, the arc extinguishing portion 11 may include an arc inlet. Exemplarily, the arc inlet is located at a first side or a second side of the arc extinguishing portion 11 along the first direction X, that is, the top or the bottom of the arc extinguishing portion 11.
[0062] like Figure 3 As shown, the static contact 12 is arranged on a first side of the arc extinguishing portion 11 along the first direction X. The static contact 2 is used to introduce an arc into the arc extinguishing portion 11 from the top of the arc extinguishing portion 11 for arc extinguishing.
[0063] like Figure 2 and Figure 3 As shown, the arc-starting plate 12 is arranged at the second side of the arc-extinguishing portion 11 along the first direction X, that is, at the bottom of the arc-extinguishing portion 11. The arc-starting plate 12 is used to introduce the arc into the arc-extinguishing portion 11 from the bottom of the arc-extinguishing portion 11 for arc extinguishing.
[0064] The first mounting portion is arranged at one end of the arc extinguishing hood along the second direction Y, and the second mounting portion is arranged at one end of the arc extinguishing hood along the second direction Y. A first arc isolation plate 13 is arranged on the first mounting plate, and a second arc isolation plate 14 is arranged on the second mounting plate. The second direction Y is the width direction of the arc extinguishing hood, and the second direction Y is perpendicular to the first direction X.
[0065] The stationary contact 2 and the arc striking plate 12 are both located between the first arc striking plate 13 and the second arc striking plate 14, and the first arc striking plate 13 and the second arc striking plate 14 cover the stationary contact 2 and the arc striking plate 12 in the second direction Y, so as to block the arc from escaping at the stationary contact 2 and the arc striking plate 12. Therefore, the first arc striking plate 13 and the second arc striking plate 14 can block the arc during the arc extinguishing process, and reduce the probability of arc escaping during the arc extinguishing process.
[0066] In summary, in the present application, the arc extinguishing portion 11 of the arc extinguishing chamber 1 is placed close to the static contact 2 of the circuit breaker 100 along the first side of the first direction X, so that the arc around the static contact 2 can enter the arc extinguishing chamber 1 through the top of the arc extinguishing portion 11. The arc striking plate 12 is placed close to the second side of the arc extinguishing portion 11 along the first direction X, so that the arc can enter the arc extinguishing chamber 1 through the bottom of the arc extinguishing portion 11. The first arc-isolating plate 13 and the second arc-isolating plate 14 are respectively arranged on both sides of the arc extinguishing chamber 1 along the second direction Y, so that the static contact 2 and the arc-isolating plate 12 are both located between the first arc-isolating plate 13 and the second arc-isolating plate 14. And the first arc-isolating plate 13 and the second arc-isolating plate 14 cover the static contact 2 and the arc-isolating plate 12 in the second direction Y, so that the first arc-isolating plate 13 and the second arc-isolating plate 14 can block the arc during the arc extinguishing process, thereby reducing the probability of arc escape during the arc extinguishing process.
[0067] In some embodiments, the first arc isolation plate 13 and the second arc isolation plate 14 can be made of polyamide or polyoxymethylene, so that the first arc isolation plate 13 and the second arc isolation plate 14 release arc extinguishing gas after being heated.
[0068] An electric arc is a high-energy and high-temperature phenomenon.
[0069] Polyamide material (PA66) or polyoxymethylene material (POM) will undergo thermal decomposition in a high temperature environment and release arc extinguishing gas, thereby accelerating the arc extinguishing speed and further enhancing the arc extinguishing effect of the arc extinguishing chamber 1.
[0070] It should be noted that the materials of the first arc isolation plate 13 and the second arc isolation plate 14 include but are not limited to the above two materials.
[0071] Based on the description of the above embodiments, the material of the first arc isolation plate 13 and the second arc isolation plate 14 can be polyamide material or polyoxymethylene material, so that the first arc isolation plate 13 and the second arc isolation plate 14 release arc extinguishing gas after being heated, thereby accelerating the arc extinguishing speed and further enhancing the arc extinguishing effect of the arc extinguishing chamber 1.
[0072] In some embodiments, Figure 4 and Figure 5 As shown, the arc extinguishing portion 11 includes an arc extinguishing grid group and a grid support 112. The arc extinguishing grid group includes a plurality of arc extinguishing grids 111 stacked along a first direction X. A Y-shaped arc striking groove 1111 is provided on a side of each arc extinguishing grid 111 close to the stationary contact 2. The grid support 112 includes a first side plate 1121 and a second side plate 1122. The first side plate 1121 is arranged on one side of the arc extinguishing grid group along the second direction Y. The second side plate 1122 is arranged on the other side of the arc extinguishing grid group along the second direction Y. One end of each arc extinguishing grid 111 is fixed to the first side plate 1121. The other end of each arc extinguishing grid 111 is fixed to the second side plate 1122.
[0073] The arc extinguishing grid group includes a plurality of arc extinguishing grids 111 stacked along a first direction X. The arc extinguishing grids 111 can be made of steel sheets. After the arc enters the arc extinguishing cover, the arc extinguishing grids 111 divide a long arc into multiple short arcs. When the AC current passes through zero, all the short arcs are extinguished at the same time. Therefore, the more layers of the arc extinguishing grids 111, the more times and the more the long arc is divided, and the better the arc extinguishing effect of the arc extinguishing grid group. Specifically, the number of arc extinguishing grids 111 in the arc extinguishing grid group can be greater than or equal to 11 layers to ensure the arc extinguishing effect of the arc extinguishing grid group.
[0074] Furthermore, the arc-starting plate 12 arranged at the bottom of the arc-extinguishing portion 11 along the first direction X can be regarded as a layer of arc-extinguishing grid 111. That is, the number of layers of arc-extinguishing grids 111 in the arc-extinguishing grid group is increased, thereby further improving the arc-extinguishing effect of the arc-extinguishing chamber 1.
[0075] Furthermore, each arc-extinguishing grid 111 is provided with an arc-striking groove 1111. The arc-striking groove 1111 is used to introduce the arc into the arc-extinguishing grid 111 for arc extinguishing. Specifically, the shape of the arc-striking groove 1111 includes but is not limited to two types: a V-shaped arc-striking groove 1111 and a Y-shaped arc-striking groove 1111. Compared with the V-shaped arc-striking groove 1111, the Y-shaped arc-striking groove 1111 can make it easier for the arc to enter the arc-extinguishing grid 111, thereby improving the arc extinguishing effect.
[0076] like Figure 4 and Figure 5 As shown, the arc extinguishing grid 111 in the present application is provided with a Y-shaped arc striking groove 1111 .
[0077] The grid support 112 may include a first side plate 1121 and a second side plate 1122 that are arranged opposite to each other along the second direction Y. The first side plate 1121 and the second side plate 1122 may both fix the arc extinguishing grid 111 to make the arc extinguishing grid 111 relatively stable in the circuit breaker 100 to ensure the arc extinguishing effect of the arc extinguishing grid 111.
[0078] Based on the description of the above embodiment, the arc extinguishing grid group in the arc extinguishing portion 11 includes a plurality of arc extinguishing grids 111 stacked along the first direction X. A Y-shaped arc-initiating groove 1111 is provided on the side of each arc extinguishing grid 111 close to the stationary contact 2, so that the arc can more easily enter the arc extinguishing grid 111, thereby improving the arc extinguishing effect of the arc extinguishing chamber 1. The grid support 112 may include a first side plate 1121 and a second side plate 1122 that are relatively arranged along the second direction Y. Among them, the first side plate 1121 and the second side plate 1122 can both fix the arc extinguishing grid 111, so that the arc extinguishing grid 111 is relatively stable in the circuit breaker 100, so as to ensure the arc extinguishing effect of the arc extinguishing grid 111.
[0079] Furthermore, the assembly structure of the first side plate 1121, the second side plate 1122 and the arc-extinguishing grid 111 may include but is not limited to the following two situations:
[0080] The first case is Figure 4 As shown, the arc-extinguishing grid 111 is provided with protruding structures on both sides along the second direction Y. A plurality of clamping grooves are correspondingly provided on the first side plate 1121 and the second side plate 1122, so that each clamping groove corresponds to a protruding structure. The protruding structure is clamped in the clamping groove, so that the arc-extinguishing grid 111 is fixed between the first side plate 1121 and the second side plate 1122.
[0081] The second case is Figure 5 As shown, the arc-extinguishing grid 111 is provided with reverse clamping grooves on both sides of the second direction Y, and the opening direction of the reverse clamping grooves faces the first side plate 1121 and the second side plate 1122. The two reverse clamping grooves are clamped on the first side plate 1121 and the second side plate 1122 respectively, so that the arc-extinguishing grid 111 is fixed between the first side plate 1121 and the second side plate 1122.
[0082] In order to adapt to the two assembly structures of the arc-extinguishing bracket and the arc-extinguishing grid group, the assembly structure of the arc-isolating plate is also divided into the following two types.
[0083] In the first case, if Figure 4 As shown, the first installation portion is the first side plate 1121, and the second installation portion is the second side plate 1122. The first arc isolation plate 13 is connected to the first side plate 1121. The second arc isolation plate 14 is connected to the second side plate 1122.
[0084] In the second case, if Figure 5 As shown, the arc extinguishing grid 111 extends toward the first arc isolation plate 13 with a first end 111a. The arc extinguishing grid 111 extends toward the second arc isolation plate 14 with a second end 111b. The first mounting portion is the first end 111a, and the second mounting portion is the second end 111b. The first arc isolation plate 13 is connected to the first end 111a. The second arc isolation plate 14 is connected to the second end 111b.
[0085] In summary, the operator can select the above two matching methods according to the needs, so that the first arc isolation plate 13 is connected to the first installation part, and the second arc isolation plate 14 is connected to the second installation part.
[0086] Combination Figure 6 It can be seen that, in some embodiments, a first mounting groove 131 is provided on a side of the first arc isolation plate 13 facing the arc extinguishing cover.
[0087] A second mounting groove 141 is provided on one side of the second arc isolation plate 14 facing the arc extinguishing cover. The first mounting groove 131 is sleeved on the first mounting portion.
[0088] The second mounting groove 141 is sleeved on the second mounting portion.
[0089] A first mounting groove 131 is provided on the side of the first arc isolation plate 13 facing the arc extinguishing hood, and a second mounting groove 141 is provided on the side of the second arc isolation plate 14 facing the arc extinguishing hood. The first arc isolation plate 13 and the second arc isolation plate 14 are both shell 4 structures with accommodating cavities. Specifically, the thickness of the shell 4 structure can be greater than 1 mm to ensure the structural strength of the shell 4.
[0090] When the first mounting groove 131 is sleeved on the first mounting portion, the inner wall of the first mounting groove 131 and the outer wall of the first mounting portion abut against each other, thereby positioning the first arc isolation plate 13 so that the first arc isolation plate 13 can stably play a role in blocking arc escape during the arc extinguishing process.
[0091] When the second mounting groove 141 is sleeved on the second mounting portion, the inner wall of the second mounting groove 141 and the outer wall of the second mounting portion abut against each other, so that the second arc isolation plate 14 can be positioned so that the second arc isolation plate 14 can stably play the role of blocking arc escape during the arc extinguishing process.
[0092] For the first arc isolation plate assembly structure, Figure 4 and Figure 6 In combination, the first mounting groove 131 is sleeved on the first side plate 1121 , and the second mounting groove 141 is sleeved on the second side plate 1122 .
[0093] For the second arc isolation plate assembly structure, Figure 5 and Figure 6 In combination, the first mounting groove 131 is sleeved on the first end 111 a of the arc extinguishing grid 111 extending toward the first arc isolation plate 13 , and the second mounting groove 141 is sleeved on the second end 111 b of the arc extinguishing grid 111 extending toward the second arc isolation plate 14 .
[0094] Based on the description of the above embodiment, by sleeve-mounting the first mounting groove 131 of the first partition plate on the first mounting portion, and sleeve-mounting the second mounting groove 141 of the second partition plate on the second mounting portion, the first arc isolation plate 13 and the second arc isolation plate 14 can be positioned so that the first arc isolation plate 13 and the second arc isolation plate 14 can stably play a role in blocking arc escape during the arc extinguishing process.
[0095] In some embodiments, Figure 6 As shown, a first boss 132 is provided in the first mounting groove 131. When the first mounting groove 131 is sleeved on the first mounting portion, the first boss 132 abuts against the first mounting portion. A second boss 142 is provided in the second mounting groove 141. When the second mounting groove 141 is sleeved on the second mounting portion, the second boss 142 abuts against the second mounting portion.
[0096] The first boss 132 arranged in the first mounting groove 131 abuts against the first mounting portion, so that the first arc isolation plate 13 is interference connected with the first mounting portion, so that the first arc isolation plate 13 is clamped on the first mounting portion and cannot move, thereby achieving comprehensive positioning of the first arc isolation plate 13, which can further improve the stability of the first arc isolation plate 13 during the arc extinguishing process.
[0097] The second bosses 142 arranged in the second mounting grooves 141 are all in contact with the second mounting portion, so that the second arc isolation plate 14 is interference-connected with the second mounting portion, so that the second arc isolation plate 14 is clamped on the first mounting portion and cannot move, thereby achieving comprehensive positioning of the second arc isolation plate 14, which can further improve the stability of the first arc isolation plate 13 during the arc extinguishing process.
[0098] For the first case, the first boss 132 is connected to the first side plate 1121 by interference fit. The second boss 142 is connected to the second side plate 1122 by interference fit.
[0099] For the second case, the first boss 132 is in interference connection with the first end 111a of the arc extinguishing grid 111 extending toward the first arc isolation plate 13. The second boss 142 is in interference connection with the first end 111a of the arc extinguishing grid 111 extending toward the first arc isolation plate 13.
[0100] In summary, the first boss 132 provided in the first mounting groove 131 abuts against the first mounting groove 131, and the second boss 142 provided in the second mounting groove 141 abuts against the second mounting groove 141. The first arc-isolating plate 13 is interference-connected with the first mounting portion, and the second arc-isolating plate 14 is interference-connected with the second mounting portion. Based on this, the first arc-isolating plate 13 and the second arc-isolating plate 14 are fully positioned, and the stability of the first arc-isolating plate 13 and the second arc-isolating plate 14 during the arc extinguishing process can be further improved.
[0101] In some embodiments, Figure 6 As shown, two first bosses 132 are disposed in the first installation groove 131 , and two second bosses 142 are disposed in the second installation groove 141 .
[0102] The first boss 132 is interference-connected with the first mounting groove 131, but the area of the abutment surface between the first boss 132 and the first mounting groove 131 is small. Based on this, the interference connection between the first boss 132 and the first mounting groove 131 can increase the area of the abutment surface and increase the stability of the connection between the first arc isolation plate 13 and the first mounting portion.
[0103] Furthermore, when the number of the first bosses 132 is greater than two, there are multiple interference connections between the first bosses 132 and the first mounting grooves 131. Based on this, the interference connection between the two first bosses 132 and the first mounting grooves 131 can prevent the first arc isolation plate 13 from being over-positioned with the first mounting portion.
[0104] The specific positions of the two first bosses 132 in the first installation groove 131 are not specifically limited in this application.
[0105] For example, Figure 3 As shown, two first bosses 132 are arranged in the first installation groove 131 , one first boss 132 is arranged at one side of the first installation groove 131 along the first direction X, and the other first boss 132 is arranged at the other side of the first installation groove 131 along the first direction X.
[0106] In summary, the first mounting groove 131 is provided with two first bosses 132, which increases the stability of the connection between the first arc isolation plate 13 and the first mounting portion, and can prevent the first arc isolation plate 13 from being over-positioned with the first mounting portion. Similarly, the second mounting groove 141 is provided with two second bosses 142, which increases the stability of the connection between the second arc isolation plate 14 and the second mounting portion, and can prevent the second arc isolation plate 14 from being over-positioned with the second mounting portion.
[0107] In some embodiments, Figure 6 and Figure 7 As shown, a first chamfer 1311 is provided at the opening of the first installation slot 131. A second chamfer 1411 is provided at the opening of the second installation slot 141.
[0108] When the first arc isolation plate 13 is sleeved on the first mounting portion, the first chamfer 1311 plays a role of guiding the installation. At the same time, the first chamfer 1311 reduces the difficulty of assembling the first arc isolation plate 13. The second chamfer 1411 is similar and will not be described in detail here.
[0109] Further, the first boss 132 has a first inclined surface 1321 on one side facing the first mounting portion. The second boss 142 has a second inclined surface 1421 on one side facing the second mounting portion. The first chamfer 1311 matches the first inclined surface 1321. The second chamfer 1411 matches the second inclined surface 1421.
[0110] The chamfer provided at the opening of the first installation groove 131 may be arranged opposite to the first inclined surface 1321 , further reducing the difficulty of assembling the first arc isolation plate 13 .
[0111] Similarly, the chamfer provided at the opening of the second installation groove 141 can be arranged opposite to the second inclined surface 1421 , further reducing the difficulty of assembling the second arc isolation plate 14 .
[0112] Based on the description of the above embodiment, the first chamfer 1311 of the first mounting groove 131 cooperates with the first inclined surface 1321 of the first boss 132, and the second chamfer 1411 of the second mounting groove 141 cooperates with the second inclined surface 1421 of the second boss 142, which play a role in guiding the installation of the first arc isolation plate 13 and the second arc isolation plate 14. At the same time, the difficulty of assembling the first arc isolation plate 13 and the second arc isolation plate 14 is reduced.
[0113] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.
[0114] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. An arc extinguishing chamber for extinguishing an arc at a stationary contact, characterized in that: include: An arc extinguishing hood, a first arc-isolating plate and a second arc-isolating plate; The arc extinguishing hood comprises an arc extinguishing portion, an arc striking plate, a first mounting portion and a second mounting portion; The arc extinguishing portion is close to the stationary contact along a first side of a first direction, wherein the first direction is a height direction of the arc extinguishing portion; The arc striking plate is close to a second side of the arc extinguishing portion along the first direction; The first mounting portion and the second mounting portion are respectively arranged at two ends of the arc extinguishing cover along a second direction, and the second direction is perpendicular to the first direction; The first arc isolation plate is connected to the first mounting portion; The second arc isolation plate is connected to the second mounting portion; The static contact and the arc-starting plate are both located between the first arc-isolating plate and the second arc-isolating plate; The first arc isolation plate covers one side of the static contact and the arc striking plate in the second direction; The second arc isolation plate covers the other side of the static contact and the arc striking plate in the second direction.
2. The arc extinguishing chamber according to claim 1, characterized in that: The first arc isolation plate and the second arc isolation plate are made of polyamide or polyoxymethylene, so that the first arc isolation plate and the second arc isolation plate release arc extinguishing gas after being heated.
3. The arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing part includes an arc extinguishing grid group and a grid support; The arc-extinguishing grid group includes a plurality of arc-extinguishing grids stacked along the first direction; A Y-shaped arc striking groove is provided on one side of each arc extinguishing grid close to the static contact; The grid support comprises a first side plate and a second side plate; The first side plate is arranged on one side of the arc extinguishing grid group along the second direction; The second side plate is arranged on the other side of the arc extinguishing grid group along the second direction; One end of each of the arc-extinguishing grids is fixed to the first side plate; The other end of each of the arc-extinguishing grids is fixed to the second side plate.
4. The arc extinguishing chamber according to claim 3, characterized in that: The first mounting portion is the first side plate, and the second mounting portion is the second side plate; The first arc isolation plate is connected to the first side plate; The second arc isolation plate is connected to the second side plate.
5. The arc extinguishing chamber according to claim 3, characterized in that: The arc extinguishing grid has a first end extending toward the first arc isolation plate; The arc extinguishing grid has a second end extending toward the second arc isolation plate; The first mounting portion is the first end, and the second mounting portion is the second end; The first arc isolation plate is connected to the first end; The second arc isolation plate is connected to the second end.
6. The arc extinguishing chamber according to claim 4 or 5, characterized in that: A first mounting groove is provided on a side of the first arc isolation plate facing the arc extinguishing cover; A second mounting groove is provided on a side of the second arc isolation plate facing the arc extinguishing cover; The first mounting groove is sleeved on the first mounting portion; The second mounting groove is sleeved on the second mounting portion.
7. The arc extinguishing chamber according to claim 6, characterized in that: A first boss is provided in the first mounting groove; When the first mounting groove is sleeved on the first mounting portion, the first boss abuts against the first mounting portion; A second boss is provided in the second mounting groove; When the second mounting groove is sleeved on the second mounting portion, the second bosses are in contact with the second mounting portion.
8. The arc extinguishing chamber according to claim 7, characterized in that: Two first bosses are provided in the first mounting groove; Two second bosses are arranged in the second mounting groove.
9. The arc extinguishing chamber according to claim 7, characterized in that: A first chamfer is provided at the opening of the first mounting groove; A second chamfer is provided at the opening of the second mounting groove; A first inclined surface is provided on one side of the first boss facing the first mounting portion; A second inclined surface is provided on one side of the second boss facing the second mounting portion; The first chamfer cooperates with the first inclined surface; The second chamfer cooperates with the second inclined surface.
10. A circuit breaker, characterized in that: Comprising a housing, a moving contact, a stationary contact and an arc extinguishing chamber as described in any one of claims 1 to 9; The housing has a receiving cavity, and the moving contact, the static contact and the arc extinguishing chamber are all arranged in the receiving cavity; The moving contact is rotatably connected in the housing; The stationary contact is arranged on the rotation track of the moving contact, and an arc is generated when the moving contact contacts the stationary contact; The arc extinguishing chamber is close to the static contact and is used for extinguishing the arc.