Circuit breaker
By introducing the design of contact arc extinguishing module and metal mesh plate into the circuit breaker, the secondary short circuit problem caused by arc ejection is solved, the arc is effectively filtered and extinguished, and the safety and reliability of the circuit breaker are ensured.
Patent Information
- Application Number
- CN202422838131.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-20
AI Technical Summary
When the circuit breaker breaks a short-circuit and large current, the arc sprays out of the air outlet, which may cause the arc to spray onto the iron plate to form a secondary short circuit, causing an electrical accident such as drawer burning.
A circuit breaker is designed, comprising a contact arc extinguishing module and a metal mesh plate. The contact arc extinguishing module is built into a housing, an air outlet is aligned with the metal mesh plate, an exhaust channel is connected to the outside, ribs are provided to make the exhaust channel meander, the metal mesh plate is interference fit with the slot, and the mesh aperture is limited to ensure that the arc is filtered and extinguished by the metal mesh plate.
It achieves effective filtering and extinguishing of arcs, avoids arc running, prevents product damage, achieves zero arcing effect, and ensures the safety and reliability of circuit breakers.
Smart Images
Figure CN223450826U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrical technology field, concretely relates to a circuit breaker. BACKGROUND
[0002] The circuit breaker will be accompanied by the phenomenon that the arc is ejected from the air outlet while breaking the short-circuit large current, if the product is installed in the drawer cabinet and is too close to the drawer iron plate, the ejected arc will be sprayed on the iron plate and the power supply end to form secondary short circuit, causing the serious electrical accident of the drawer burning, in order to avoid the generation of this phenomenon, the circuit breaker needs to reduce the arc flying, even zero arc flying becomes the top priority of development and research. SUMMARY
[0003] Therefore, the technical problem to be solved by the utility model lies in how to reduce the arc flying, even zero arc flying. For this purpose, a circuit breaker comprises:
[0004] A body is provided with a containing cavity, the body comprises a first wiring end and a second wiring end, and the first wiring end and the second wiring end are respectively two ends in the length direction of the body;
[0005] A contact arc extinguishing module is accommodated in the containing cavity, the contact arc extinguishing module comprises a shell, the shell accommodates a contact assembly and an arc extinguishing assembly, the shell is provided with an air outlet on the side facing the first wiring end, and the arc extinguishing assembly is provided with an air channel, and the tail end of the air channel is communicated with the air outlet;
[0006] A metal mesh plate is fixed on the body, and in the length direction of the body, the metal mesh plate is located between the first wiring end and the contact arc extinguishing module;
[0007] The air outlet is aligned with the metal mesh plate to filter the gas from the air outlet.
[0008] The first wiring end is provided with an exhaust passage, one end of the exhaust passage is close to the metal mesh plate, the other end of the exhaust passage is an exhaust port communicated with the outside, and at least part of the gas passing through the metal mesh plate flows to the outside through the exhaust passage.
[0009] The distance from the air outlet to the outer wall of the first wiring end is at least 15mm.
[0010] The inner wall of the exhaust passage is provided with at least two rib strips, the rib strips are distributed in staggered positions, so that the exhaust passage is serpentine.
[0011] The lower end of the rib strip exceeds the lower end of the metal mesh plate.
[0012] The body comprises a cover body, the exhaust passage is arranged on the cover body, and the metal mesh plate is fixed on the cover body.
[0013] The cover is provided with a slot, and the metal mesh plate is inserted into the slot; the metal mesh plate is in interference fit with the slot to prevent the metal mesh plate from falling off, or a limiting structure is arranged at the slot opening of the slot to limit the metal mesh plate from falling off.
[0014] The lowest end of the metal mesh plate is lower than the lowest end of the air outlet, or a gap is arranged between the metal mesh plate and the air outlet, and the gap is not greater than 3 mm.
[0015] The metal mesh plate is a metal sheet or a metal wire braid, and the aperture of the mesh hole on the metal mesh plate is 100-250 um.
[0016] The contact assembly is a single-break point structure or a double-break point structure.
[0017] The utility model technical scheme has the following advantages:
[0018] 1. The utility model provides a circuit breaker, first contact assembly and arc extinguishing assembly are all contained in the shell, form a modular design, form sealing effect at this moment, the arc produced by breaking short-circuit large current cannot run away, the arc cannot influence other structures (tripping mechanism, operating mechanism and the like) of the whole circuit breaker, the arc can only be discharged through the air outlet, at this moment, the discharged arc is blocked by the metal mesh plate to prevent small arc particles from being sprayed, and at the same time, the gas can pass through, preventing the air outlet from being sealed, the product pressure is too large, and the product is cracked.
[0019] 2. The utility model provides a circuit breaker, the setting of the exhaust passage forms communication with the outside, so that the gas can be smoothly discharged.
[0020] 3. The utility model provides a circuit breaker, the length is limited, improves the effect of preventing arc flying, and finally realizes the effect of zero arc flying.
[0021] 4. The utility model provides a circuit breaker, the setting of the rib makes the exhaust passage meander, and the arc spraying distance is increased.
[0022] 5. The utility model provides a circuit breaker, the length of the rib is limited, the arc spraying path is further wrapped, the arc spraying distance is lengthened, and the creepage distance is also increased, and finally the effect of zero arc flying is realized.
[0023] 6. The utility model provides a circuit breaker, the exhaust passage is arranged on the cover, and the processing is more convenient.
[0024] 7. The utility model provides a circuit breaker, the cooperation between the metal mesh plate and the slot better realizes the fixing effect of the metal mesh plate.
[0025] 8. The circuit breaker provided by the utility model, the position of the metal mesh plate is limited, so that the air outlet can better align with the metal mesh plate, preventing the arc from running around; the gap is set, so that a certain distance is formed between the metal mesh plate and the air outlet, and the particles blocked by the metal mesh plate can directly fall off and will not accumulate in the air outlet, affecting the subsequent arc ejection.
[0026] 9. The circuit breaker provided by the utility model, the mesh aperture is limited, better realizing the anti-arc flying effect. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0028] Figure 1 The utility model provides a kind of circuit breaker's structural schematic diagram;
[0029] Figure 2 The utility model provides a kind of circuit breaker's sectional view;
[0030] Figure 3 For Figure 2 The utility model provides a kind of circuit breaker's structural schematic diagram;
[0031] Figure 4 The utility model provides a kind of contact arc extinguishing module's structural schematic diagram;
[0032] Figure 5 The utility model provides a kind of contact arc extinguishing module's sectional view;
[0033] Figure 6 The utility model provides a kind of upper cover and metal mesh plate cooperation's structural schematic diagram;
[0034] Figure 7 For Figure 6 The utility model provides a kind of circuit breaker's structural schematic diagram;
[0035] Figure 8 For Figure 6 The utility model provides a kind of circuit breaker's structural schematic diagram;
[0036] BRIEF DESCRIPTION OF DRAWINGS
[0037] 11. Main body; 12. Contact arc extinguishing module; 13. Metal mesh; 14. Exhaust channel; 15. Rib; 16. Cover; 17. Base; 18. Gap; 111. Accommodating cavity; 112. First terminal; 113. Second terminal; 121. Shell; 122. Contact assembly; 123. Arc extinguishing assembly; 124. Air outlet; 125. Air duct; 141. Exhaust port; 161. Slot; 162. Protrusion. DETAILED DESCRIPTION
[0038] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0042] Example 1
[0043] This embodiment provides a circuit breaker, as shown in the attached Figures 1-8 Shown, including:
[0044] The body 11 is provided with a receiving cavity 111. The body 11 includes a first wiring end 112 and a second wiring end 113. The first wiring end 112 is specifically a wire inlet end, that is, a power supply end, that is, an external circuit access to the circuit breaker. The second wiring end 113 is a wire outlet end, that is, a load end, used for electrical connection with a load device. The first wiring end 112 and the second wiring end 113 are respectively two ends in the length direction of the body 11. In the embodiment, the number of phase lines of the body 11 can be adjusted according to actual needs, which can be two-phase, three-phase, or more.
[0045] The contact arc extinguishing module 12 is accommodated in the receiving cavity 111. Here, the contact arc extinguishing module 12 corresponds to one phase circuit. When the body 11 is two-phase, the number of contact arc extinguishing modules 12 is two; when the body 11 is three-phase, the number of contact arc extinguishing modules 12 is three. Adjacent two contact arc extinguishing modules 12 are independently arranged. The contact arc extinguishing module 12 includes a shell 121, and the shell 121 accommodates a contact assembly 122 and an arc extinguishing assembly 123. The contact assembly 122 and the arc extinguishing assembly 123 cooperate, and the arc generated by the breaking is extinguished by the arc extinguishing assembly 123. The shell 121 is provided with a gas outlet 124 on the side facing the first wiring end 112. The arc extinguishing assembly 123 is provided with a gas channel 125, and the end of the gas channel 125 is in communication with the gas outlet 124. The arc generated by the contact assembly 122 is sprayed out through the gas channel 125 of the arc extinguishing assembly 123 and the gas outlet 124. Here, how the contact mechanism moves is prior art, so it is not described in detail in the embodiment.
[0046] In addition, the receiving cavity 111 also fixes a tripping mechanism and an operating mechanism.
[0047] The metal mesh plate 13 is fixed on the body 11. In the length direction of the body 11, the metal mesh plate 13 is located between the first wiring end 112 and the contact arc extinguishing module 12. In the embodiment, one phase line corresponds to one metal mesh plate 13, and adjacent two metal mesh plates 13 are independently arranged and do not interfere with each other, and will not cause short circuit phenomenon. Specifically, it is isolated by the body 11.
[0048] The outlet 124 is aligned with the metal mesh plate 13 to filter the gas from the outlet 124. The alignment means that the arc just hits the metal mesh plate 13 when it is ejected from the outlet 124 after passing through the arc extinguishing assembly 123. First, the contact assembly 122 and the arc extinguishing assembly 123 are both accommodated in the housing 121 to form a modular design, which forms a sealing effect. The arc generated by breaking a short-circuit large current cannot run around, and the arc cannot affect other structures (trip mechanism, operating mechanism, etc.) of the circuit breaker. The arc can only be discharged through the outlet 124. At this time, the discharged arc is blocked by the metal mesh plate 13 to prevent small arc particles from being ejected, and the gas can pass through to prevent the outlet from being sealed, the product pressure from being too high, and the product from exploding.
[0049] Specifically, as shown in the accompanying drawings, Figure 3 、 Figures 6-8 The first terminal 112 is provided with an exhaust passage 14, one end of the exhaust passage 14 is close to the metal mesh plate 13, and the other end of the exhaust passage 14 is an exhaust port 141 in communication with the outside. At least part of the gas passing through the metal mesh plate 13 flows to the outside through the exhaust passage 14. The exhaust passage 14 forms a communication effect with the outside. Here, the exhaust passage 14 extends outward along the length direction of the body 11. In addition, the exhaust passage 14 can also extend outward along the width direction or the height direction of the body 11.
[0050] Specifically, as shown in the accompanying drawings, Figures 1-8 The distance from the outlet 124 to the outer edge wall of the first terminal 112 is at least 15 mm. Here, the outer edge wall of the first terminal 112 is the connection position of the exhaust port 114 in communication with the outside. The length limitation improves the effect of preventing arc flying and ultimately realizes the effect of zero arc flying. However, when the arc enters the exhaust passage 14, the flow length is greater than the distance from the metal mesh plate 13 to the outer edge wall of the first terminal 112. Those skilled in the art can adjust the distance parameter and the number of ribs 15 according to actual needs to increase the flow length of the arc, so that the arc is already extinguished when it is ejected to the outer edge wall of the first terminal 112, forming an effect of zero arc flying.
[0051] Specifically, as shown in the accompanying drawings, Figure 3 、 Figures 6-8As shown, the first terminal 112 is provided with an exhaust passage 14, and the inner wall of the exhaust passage 14 is provided with at least two ribs 15, which are distributed in staggered manner to make the exhaust passage 14 meander. Here, the staggered distribution is that the ribs 15 are arranged on both sides of the inner wall of the exhaust passage 14 to form an interleaved structure. When the arc or gas enters the exhaust passage 14, it will not directly discharge towards the first terminal 112, but will flow reversely by abutting against the ribs 15, thereby increasing the path of the arc. The number and size of the ribs 15 can be adjusted according to actual needs. The provision of the exhaust passage 14 increases the path length of the arc, so that the arc is extinguished before flying out of the circuit breaker, preventing the first terminal 112 from short-circuiting. This structure can increase the arc spraying distance without increasing the length of the body 11, achieving the effect of miniaturization. In addition, the arc spraying distance can also be increased by other structures, such as increasing the length of the body 11.
[0052] Specifically, as shown in the accompanying drawings Figure 3 、 Figures 6-8 The lower end of the rib 15 exceeds the lower end of the metal mesh plate 13. The length of the rib 15 limits the arc spraying path, lengthens the arc spraying distance and increases the creepage distance, and finally achieves the effect of zero flying arc.
[0053] Specifically, the gas outlet 124 is located in the upper region of the side of the shell 121 facing the first terminal 112.
[0054] Specifically, as shown in the accompanying drawings Figures 1-8 The body 11 includes a cover 16, and the exhaust passage 1415 is arranged on the cover 16, and the metal mesh plate 13 is fixed on the cover 16. The exhaust passage 14 and the rib 15 are arranged on the cover 16, which is more convenient to process. In this embodiment, the metal mesh plate 13 is fixed with the cover 16, and the metal mesh plate 13 extends vertically downward. At this time, the lower side of the metal mesh plate 13 is suspended without being abutted by any structure. It should be noted that the body 11 also includes a base 17, and the base 17 cooperates with the cover 16 to form a containing cavity 111. The base 17 is fixed with a terminal, which is used for external wiring to form an electrical connection effect. The metal mesh plate 13 extends vertically downward towards the position of the terminal.
[0055] Specifically, as shown in the accompanying drawings Figures 1-8As shown, the cover body 16 is provided with a slot 161 which is vertically downwardly open, and the metal mesh plate 13 is inserted into the slot 161. The metal mesh plate 13 is in interference fit with the slot 161 to prevent the metal mesh plate 13 from falling off, or a limiting structure is arranged at the slot opening of the slot 161 to limit the metal mesh plate 13 from falling off. In the embodiment, the side wall of the slot 161 is provided with a protrusion 162, and the metal mesh plate 13 is embedded into the slot 161 and abuts against the protrusion 162. The protrusion 162 is arranged to form interference fit between the metal mesh plate 13 and the slot 161, so as to better achieve the fixing effect of the metal mesh plate 13. The upper end of the metal mesh plate 13 is in interference fit with the slot 161, and the lower end of the metal mesh plate 13 extends vertically downward. The shape, size and dimension of the protrusion 162 can be adjusted according to actual requirements by those skilled in the art, as long as the connection strength between the metal mesh plate 13 and the slot 161 is ensured. In addition, the metal mesh plate 13 and the cover body 16 can also be connected and fixed by bolts or buckles and the like.
[0056] Specifically, the lowest end of the metal mesh plate 13 is lower than the lowest end of the gas outlet 124. The position of the metal mesh plate 13 is limited so that the gas outlet 124 is better aligned with the metal mesh plate 13, preventing the arc from wandering.
[0057] Specifically, as shown in the accompanying drawings, Figure 3 As shown, a gap 18 is arranged between the metal mesh plate 13 and the gas outlet 124. The gap 18 is a horizontal gap 18. The gap 18 is not greater than 3 mm. The gap 18 is arranged to form a certain distance between the metal mesh plate 13 and the gas outlet 124, and the particles blocked by the metal mesh plate 13 can directly fall off and will not accumulate at the gas outlet 124, affecting the subsequent arc ejection.
[0058] Specifically, the metal mesh plate 13 is a metal sheet or a metal wire woven fabric, and the mesh hole diameter of the metal mesh plate 13 is 100-250 um. The limitation of the mesh hole diameter better achieves the effect of preventing arc flying. It should be noted that the mesh hole is not reflected in the drawings due to the small mesh hole diameter.
[0059] Specifically, the metal mesh plate 13 is made of stainless steel.
[0060] Specifically, as shown in the accompanying drawings, Figures 2-5As shown, the contact assembly 122 is a single-break structure or a double-break structure. The contact assembly 122 can be adjusted according to actual needs. In the embodiment, the contact assembly 122 is a double-break structure, that is, one contact arc-extinguishing module 12 includes one contact assembly 122 and two arc-extinguishing assemblies 123, and the two arc-extinguishing assemblies 123 are arranged on the two sides of the contact assembly 122. Since the front-end circuit has been broken during the breaking of the short-circuit large current, the arc will not affect the entire circuit breaker even if the second terminal 113 is short-circuited, so the second terminal 113 is not provided with the metal mesh plate 13, and the person skilled in the art can also set the metal mesh plate 13 on the second terminal 113 to increase the arc-extinguishing effect.
[0061] Obviously, the above embodiments are only examples for clearly illustrating but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.
Claims
1. A circuit breaker, characterized in that: include: A body (11), wherein the body (11) is provided with a receiving cavity (111), and the body (11) includes a first wiring terminal (112) and a second wiring terminal (113), wherein the first wiring terminal (112) and the second wiring terminal (113) are respectively two ends of the body (11) in a length direction; A contact arc extinguishing module (12), the contact arc extinguishing module (12) being accommodated in the accommodating cavity (111), the contact arc extinguishing module (12) comprising a housing (121), a contact assembly (122) and an arc extinguishing assembly (123) being accommodated in the housing (121), an air outlet (124) being provided on a side of the housing (121) facing the first terminal (112), the arc extinguishing assembly (123) being provided with an air duct (125), and an end of the air duct (125) being in communication with the air outlet (124); A metal mesh plate (13), the metal mesh plate (13) being fixed to the body (11), and being located between the first terminal (112) and the contact arc extinguishing module (12) in the length direction of the body (11); The gas outlet (124) is oriented toward the metal mesh plate (13) to filter the gas from the gas outlet (124).
2. The circuit breaker according to claim 1, wherein: The first terminal (112) is provided with an exhaust channel (14), one end of the exhaust channel (14) is close to the metal mesh plate (13), and the other end of the exhaust channel (14) is an exhaust port (141) connected to the outside, and at least a portion of the gas passing through the metal mesh plate (13) flows to the outside via the exhaust channel (14).
3. The circuit breaker according to claim 2, characterized in that The distance between the air outlet (124) and the outer wall of the first connection terminal (112) is at least 15 mm.
4. The circuit breaker according to claim 2, wherein: The inner wall of the exhaust channel (14) is provided with at least two ribs (15), and the ribs (15) are staggered and distributed so as to make the exhaust channel (14) meander.
5. The circuit breaker according to claim 4, characterized in that The lower end of the rib (15) exceeds the lower end of the metal mesh plate (13).
6. The circuit breaker according to claim 2 or 4, characterized in that: The main body (11) includes a cover (16), the exhaust passage (14) is arranged on the cover (16), and the metal mesh plate (13) is fixed on the cover (16).
7. The circuit breaker according to claim 6, characterized in that The cover body (16) is provided with a slot (161), and the metal mesh plate (13) is inserted into the slot (161); the metal mesh plate (13) and the slot (161) are interference-fitted to prevent the metal mesh plate (13) from falling off, or a limiting structure is provided at the notch of the slot (161) to limit the metal mesh plate (13) from falling off.
8. The circuit breaker according to claim 1, wherein: The lowest end of the metal mesh plate (13) is lower than the lowest end of the air outlet (124); or, a gap (18) is provided between the metal mesh plate (13) and the air outlet (124), and the gap (18) is not greater than 3 mm.
9. The circuit breaker according to claim 1 or 2 or 5 or 7 or 8, characterized in that: The metal mesh plate (13) is a metal sheet or a metal wire braid, and the aperture of the mesh on the metal mesh plate (13) is 100um-250um.
10. The circuit breaker according to claim 1, wherein: The contact assembly (122) is a single-breakpoint structure or a double-breakpoint structure.