Arc extinguishing mechanism of circuit breaker and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and discloses an arc extinguishing mechanism of a circuit breaker and the circuit breaker. The circuit breaker comprises a shell and an arc extinguishing mechanism, the arc extinguishing mechanism comprises an arc extinguishing cover and a plurality of arc extinguishing grid pieces, the arc extinguishing cover comprises an upper side wall, a lower side wall, a left side wall and a right side wall and forms an arc extinguishing cavity in a surrounding mode, and the arc extinguishing grid pieces are arranged in the arc extinguishing cavity at intervals. The left end and the right end of the arc extinguishing grid sheet are respectively supported on the left side wall and the right side wall, and the arc extinguishing cover is integrally formed. The arc extinguishing mechanism of the utility model has the advantages of few parts, convenient assembly and good arc extinguishing reliability. The circuit breaker provided by the utility model is provided with the arc extinguishing mechanism, the structure is simple, and the arc extinguishing reliability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing mechanism of a circuit breaker and the circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under abnormal circuit conditions within a specified time. When the circuit breaker interrupts the current, an arc will be generated between the moving and static contacts. If the arc cannot be extinguished quickly, the continuous burning will seriously damage the moving and static contacts. In severe cases, it can also cause the circuit breaker to fail to effectively interrupt the fault current.

[0003] The arc extinguishing chamber is an important part of the arc extinguishing system of the molded case circuit breaker, which is used to divide, cool and extinguish the arc. The existing arc extinguishing chamber includes two left and right arc isolation plates and a number of metal grids. The metal grids are fixed on the left and right arc isolation plates by riveting. The metal grids are used to divide and extinguish the arc. At the same time, the arc extinguishing system of the molded case circuit breaker also includes an arc extinguishing hood, which is arranged between the arc extinguishing chamber and the moving and static contacts. The arc extinguishing hood produces a large amount of gas when the arc erodes, thereby achieving the effect of gas blowing to extinguish the arc. This type of arc extinguishing system of the circuit breaker has a large number of parts and a complex assembly process. Utility Model Content

[0004] One purpose of the utility model is to provide an arc extinguishing mechanism for a circuit breaker, which has fewer parts, is easy to assemble, and has good arc extinguishing reliability.

[0005] Another object of the utility model is to provide a circuit breaker which has a simple structure and good arc extinguishing reliability by providing the above arc extinguishing mechanism.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The arc extinguishing mechanism of the circuit breaker comprises an arc extinguishing hood and a plurality of arc extinguishing grids, wherein the arc extinguishing hood comprises an upper side wall, a lower side wall, a left side wall and a right side wall and is surrounded to form an arc extinguishing cavity, wherein a plurality of arc extinguishing grids are arranged in the arc extinguishing cavity at intervals, and the left and right ends of the arc extinguishing grids are respectively supported on the left side wall and the right side wall, and the arc extinguishing hood is formed in one piece.

[0008] As an optional solution, the arc extinguishing cover is provided with a plurality of mounting structures for supporting the arc extinguishing grid, and the mounting structures include a first slot and a second slot respectively arranged on the left side wall and the right side wall, and the two ends of the arc extinguishing grid are respectively inserted into the first slot and the second slot.

[0009] As an optional solution, the mounting structure further includes a socket provided in the first slot and / or the second slot, and at least one of the left and right ends of the arc-extinguishing grid is provided with a protrusion, and the protrusion is plugged into the corresponding socket.

[0010] As an optional solution, the arc extinguishing cover is integrally injection-molded from nylon material.

[0011] As an optional solution, the circuit breaker includes a static contact and a static contact point arranged on the static contact, the lower side wall is provided with a first avoidance hole for the static contact point to extend into the arc extinguishing chamber, and the lower side wall is arranged in close contact with the static contact.

[0012] As an optional scheme, the front and rear ends of the lower side wall facing away from the arc extinguishing chamber respectively form a first profile and a second profile, at least part of the first profile and at least part of the second profile are respectively fitted with the front and rear ends of the static contact, and the second profile extends outside the left side wall and the right side wall.

[0013] As an optional solution, a side of the upper side wall facing away from the arc extinguishing chamber forms an abutment plane, and the abutment plane is configured to abut against a housing of the circuit breaker; and / or

[0014] A plurality of weight-reducing grooves are arranged on the upper side wall.

[0015] As an optional solution, the arc extinguishing cover further comprises a rear side wall, and a second avoidance hole is provided on the rear side wall, and the second avoidance hole is configured to allow the moving contact of the circuit breaker to extend into the arc extinguishing cavity.

[0016] A circuit breaker comprises a contact mechanism and the above-mentioned arc extinguishing mechanism, wherein the contact mechanism comprises a static contact, a static contact point arranged on the static contact, and a moving contact, wherein the static contact point and the moving contact extend laterally into the arc extinguishing cavity respectively.

[0017] As an optional solution, the circuit breaker further includes a shell, the contact mechanism and the arc extinguishing mechanism are both installed in the shell, and at least a portion of the static contact is covered between the lower side wall and the shell.

[0018] The beneficial effects of the utility model are:

[0019] The arc extinguishing mechanism of the utility model has an arc extinguishing hood that can produce gas under the action of the electric arc, thereby achieving the effect of blowing arc extinguishing; the arc extinguishing hood comprises an upper side wall, a lower side wall, a left side wall and a right side wall, so that the arc extinguishing cavity has a higher sealing performance, which is beneficial for the electric arc to move toward the arc extinguishing grid under the action of the airflow, so that the arc extinguishing grid can divide the arc, and the reliability of the arc extinguishing mechanism is further improved; the arc extinguishing hood is integrally formed and can support the arc extinguishing grid, so that the overall structure of the arc extinguishing mechanism is simple and the number of parts is small, which can simplify the assembly process and improve production efficiency.

[0020] The circuit breaker of the utility model has a simple structure and good arc extinguishing reliability by arranging the arc extinguishing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a circuit breaker provided by a specific implementation method of the utility model;

[0022] Figure 2 It is a longitudinal cross-sectional schematic diagram of a circuit breaker provided by a specific embodiment of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the arc extinguishing mechanism provided by a specific implementation method of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the arc extinguishing cover provided by the specific implementation mode of the utility model at a viewing angle;

[0025] Figure 5 It is a schematic diagram of the structure of the arc extinguishing cover provided by the specific embodiment of the utility model from another perspective;

[0026] Figure 6 It is a structural schematic diagram of the arc extinguishing grid provided by a specific implementation method of the utility model.

[0027] In the figure:

[0028] 10. arc extinguishing mechanism; 11. arc extinguishing cover; 111. upper side wall; 1111. abutting plane; 1112. weight reduction groove; 112. lower side wall; 1121. first profile; 1122. second profile; 1123. first avoidance hole; 113. left side wall; 1131. first slot; 114. right side wall; 1141. second slot; 115. rear side wall; 1151. second avoidance hole; 116. arc extinguishing cavity; 117. jack; 118. reflector; 12. arc extinguishing grid; 121. protrusion; 122. arc extinguishing notch;

[0029] 21. static contact; 211. U-shaped portion; 212. Z-shaped portion; 22. static contact point; 23. moving contact; 24. moving contact point;

[0030] 30. Shell; 31. Base; 32. Middle cover; 33. Upper cover;

[0031] 40. Arc starting parts. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, 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 a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] This embodiment provides an arc extinguishing mechanism of a circuit breaker and a circuit breaker, wherein the arc extinguishing mechanism has fewer parts, is easy to assemble, and has good arc extinguishing reliability. By arranging the arc extinguishing mechanism, the circuit breaker has a simple structure and good arc extinguishing reliability.

[0037] like Figure 1 and Figure 2As shown, the circuit breaker includes a housing 30, a contact mechanism and an arc extinguishing mechanism 10. The housing 30 forms a receiving cavity, and the contact mechanism and the arc extinguishing mechanism 10 are installed in the receiving cavity. Specifically, the housing 30 includes a base 31, a middle cover 32 and an upper cover 33. The base 31 and the upper cover 33 are interlocked in the up and down directions, and an opening is provided on the upper cover 33, and the middle cover 32 blocks the opening, so that the housing 30 forms a receiving cavity. The contact mechanism includes a static contact 21, a static contact 22, a moving contact 23 and a moving contact 24. The static contact 21 is fixed on the base 31, and specifically, the static contact 21 can be installed on the base 31 by fasteners such as screws. The static contact 22 is arranged on the static contact 21. The moving contact 23 is movably installed on the base 31, and the moving contact 24 is installed on the side of the moving contact 23 facing the static contact 22. When the moving contact 23 rotates relative to the base 31, the moving contact 24 and the stationary contact 22 can be brought into contact or separated, thereby realizing opening and closing of the switch.

[0038] like Figure 2 and Figure 3 As shown, the arc extinguishing mechanism 10 includes an arc extinguishing cover 11 and a plurality of arc extinguishing grids 12. The arc extinguishing cover 11 includes an upper side wall 111, a lower side wall 112, a left side wall 113 and a right side wall 114, and is surrounded to form an arc extinguishing cavity 116. The plurality of arc extinguishing grids 12 are arranged in intervals in the arc extinguishing cavity 116, thereby forming a grid-like structure. The left and right ends of the arc extinguishing grids 12 are respectively supported on the left side wall 113 and the right side wall 114, and the arc extinguishing cover 11 is formed in one piece.

[0039] The arc extinguishing mechanism 10 of this embodiment, the arc extinguishing hood 11 can produce gas under the erosion of the arc, so as to achieve the effect of blowing arc extinguishing; the arc extinguishing hood 11 includes an upper side wall 111, a lower side wall 112, a left side wall 113 and a right side wall 114, so that the arc extinguishing cavity 116 has a high sealing performance, which is conducive to the arc moving to the arc extinguishing grid 12 under the action of the airflow, so that the arc extinguishing grid 12 can divide the arc, and further improve the arc extinguishing reliability of the arc extinguishing mechanism 10; the arc extinguishing hood 11 is integrally formed and can support the arc extinguishing grid 12, so that the overall structure of the arc extinguishing mechanism 10 is simple and the number of parts is small, which can simplify the assembly process and improve production efficiency. The circuit breaker of this embodiment, by setting the above-mentioned arc extinguishing mechanism 10, has a simple structure and good arc extinguishing reliability.

[0040] In this embodiment, Figure 2 and Figure 4As shown, a first avoidance hole 1123 is provided on the lower side wall 112, and the static contact 22 extends from the first avoidance hole 1123 into the arc extinguishing cavity 116. Preferably, the lower side wall 112 is arranged in close contact with the static contact 21, so as to effectively prevent the arc from burning at the root of the static contact 21, thereby improving the service life of the static contact 21. In this embodiment, the front and rear ends of the lower side wall 112 away from the arc extinguishing cavity 116 are respectively formed with a first profile 1121 and a second profile 1122, and the first profile 1121 and the second profile 1122 are respectively located at the front and rear ends of the first avoidance hole 1123. At least part of the first profile 1121 and at least part of the second profile 1122 are respectively arranged in close contact with the front and rear ends of the static contact 21, and the second profile 1122 extends out of the left side wall 113 and the right side wall 114, and extends to the rear end of the base 31. By setting the first profile 1121 and the second profile 1122, the lower side wall 112 and the base 31 can better cover the static contact 21. That is to say, the arc extinguishing cover 11 integrates the function of the static contact cover, and the static contact cover is integrated with the arc extinguishing cover 11, so as to more reliably prevent the static contact 21 from being burned by the arc when opening and closing the switch, thereby improving the service life and stability of the static contact 21.

[0041] In this embodiment, along the front-to-back direction, the stationary contact 21 includes a Z-shaped portion 212 and a U-shaped portion 211 connected to each other, wherein the stationary contact 22 is arranged on the U-shaped portion 211. The first profile 1121 is arranged to fit the corner of the Z-shaped portion 212, and the second profile 1122 is arranged to fit the corner of the U-shaped portion 211, so as to better protect the stationary contact 21.

[0042] Preferably, if Figure 2 As shown, the circuit breaker further includes an arc-starting member 40, which is disposed on the stationary contact 21 and located on a side of the stationary contact 22 close to the arc-extinguishing grid 12, and the arc-starting member 40 also extends from the first avoidance hole 1123 into the arc-extinguishing cavity 116. The arc-starting member 40 can guide the arc to move to one side of the metal grid, thereby preventing the arc from burning the stationary contact 21 or the moving contact 23.

[0043] like Figure 2 and Figure 5 As shown, the arc extinguishing cover 11 further includes a rear side wall 115, and a second avoidance hole 1151 is provided on the rear side wall 115. The moving contact 23 extends from the second avoidance hole 1151 into the arc extinguishing cavity 116, so that the moving contact 24 can contact the static contact 22. The arrangement of the front side wall of the arc extinguishing cover 11 further improves the sealing performance of the arc extinguishing cavity 116, so that the arc moves toward the arc extinguishing grid 12 under the action of the airflow. Preferably, as Figure 5As shown, the arc extinguishing cover 11 further includes two oppositely arranged reflective plates 118, which extend from the edge of the second avoidance hole 1151 to the inside of the arc extinguishing cavity 116, and the two reflective plates 118 are respectively located on both sides of the moving contact 23. The arrangement of the reflective plates 118 can effectively prevent harmful substances such as dust, metal particles and high-temperature air from entering other mechanisms in the circuit breaker.

[0044] like Figure 2 and Figure 5 As shown, the side of the upper side wall 111 away from the arc extinguishing chamber 116 forms an abutting plane 1111, and the abutting plane 1111 abuts against the housing 30 of the circuit breaker. In this embodiment, the lower side wall 112 at the lower end of the arc extinguishing cover 11 abuts against the static contact 21, and the abutting plane 1111 at the upper end abuts against the middle cover 32, thereby ensuring that the arc extinguishing cover 11 is stably supported inside the housing 30. In order to ensure that the abutting plane 1111 fits with the middle cover 32, the longitudinal section of the upper side wall 111 is constructed as follows Figure 2 The trapezoidal structure shown. Preferably, a plurality of weight-reducing grooves 1112 are provided on the upper side wall 111, and the weight-reducing grooves 1112 can not only reduce the overall weight of the arc extinguishing mechanism 10, but also reduce the material usage of the arc extinguishing cover 11, thereby reducing the manufacturing cost. It is understandable that the specific shape and size of the weight-reducing grooves 1112 can be selected and set as needed, and the preferred solution is that the weight-reducing grooves 1112 make the wall thickness of the upper side wall 111 uniform at all locations.

[0045] Preferably, in this embodiment, the arc extinguishing cover 11 is integrally injection-molded from nylon material. Nylon material can generate a large amount of gas under arc erosion, and can blow the arc into the arc extinguishing chamber, thereby ensuring the effect of blowing arc extinguishing.

[0046] Preferably, the arc extinguishing hood 11 is provided with a plurality of mounting structures for supporting the arc extinguishing grids 12. Each arc extinguishing grid 12 is mounted on the arc extinguishing hood 11 through a corresponding mounting structure, without the need for external connectors, and has a simple structure and is easy to install. Figure 3 and Figure 4 As shown, the installation structure includes a first slot 1131 provided on the left side wall 113 and a second slot 1141 provided on the right side wall 114, and the left and right ends of the arc-extinguishing grid 12 are respectively inserted into the first slot 1131 and the second slot 1141. The insertion installation method improves the convenience of installing the arc-extinguishing grid 12. In this embodiment, the number of the first slots 1131 is equal to the number of the second slots 1141 and they are arranged one by one, so as to reliably limit each arc-extinguishing grid 12.

[0047] like Figure 6 As shown, the arc extinguishing grid 12 is a sheet-shaped metal component and is provided with an arc extinguishing notch 122 , which is used to avoid the moving contact 23 .

[0048] Preferably, if Figure 3 , Figure 4 and Figure 6 As shown, the installation structure further includes an insertion hole 117 arranged in the first slot 1131 and / or the second slot 1141, and at least one of the left and right ends of the arc-extinguishing grid 12 is provided with a protrusion 121, which is plugged into the corresponding insertion hole 117. The arc-extinguishing cover 11 itself has a certain elasticity. When the arc-extinguishing grid 12 is installed, the protrusion 121 can slightly open the left side wall 113 and the right side wall 114 of the arc-extinguishing cover 11. When the protrusion 121 is inserted into the corresponding insertion hole 117, the left side wall 113 and the right side wall 114 restore the deformation. Through the cooperation of the protrusion 121 and the insertion hole 117, the arc-extinguishing grid 12 can be prevented from sliding out of the first slot 1131 and the second slot 1141, thereby improving the structural reliability of the arc-extinguishing mechanism 10. In this embodiment, the first slot 1131 and the second slot 1141 are both provided with insertion holes 117 , and the left and right ends of the arc-extinguishing grid 12 are both provided with protrusions 121 , which are correspondingly inserted into the insertion holes 117 in the first slot 1131 and the second slot 1141 .

[0049] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the field, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scopes, and the content of this specification should not be understood as limiting the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. The arc extinguishing mechanism of the circuit breaker is characterized by: The invention comprises an arc extinguishing hood (11) and a plurality of arc extinguishing grids (12); the arc extinguishing hood (11) comprises an upper side wall (111), a lower side wall (112), a left side wall (113) and a right side wall (114) and is arranged to form an arc extinguishing cavity (116); a plurality of arc extinguishing grids (12) are arranged in the arc extinguishing cavity (116) at intervals; the left and right ends of the arc extinguishing grids (12) are respectively supported on the left side wall (113) and the right side wall (114); and the arc extinguishing hood (11) is integrally formed.

2. The arc extinguishing mechanism of the circuit breaker according to claim 1, characterized in that: The arc extinguishing cover (11) is provided with a plurality of mounting structures for supporting the arc extinguishing grid (12), the mounting structures comprising a first slot (1131) and a second slot (1141) respectively arranged on the left side wall (113) and the right side wall (114), and two ends of the arc extinguishing grid (12) are respectively inserted into the first slot (1131) and the second slot (1141).

3. The arc extinguishing mechanism of the circuit breaker according to claim 2, characterized in that: The mounting structure further comprises a socket (117) arranged in the first slot (1131) and / or the second slot (1141), and at least one of the left and right ends of the arc-extinguishing grid (12) is provided with a protrusion (121), and the protrusion (121) is plugged into the corresponding socket (117).

4. The arc extinguishing mechanism of the circuit breaker according to claim 1, characterized in that: The arc extinguishing cover (11) is integrally injection-molded from nylon material.

5. The arc extinguishing mechanism of the circuit breaker according to any one of claims 1 to 4, characterized in that: The circuit breaker comprises a static contact (21) and a static contact point (22) arranged on the static contact (21); a first avoidance hole (1123) for allowing the static contact point (22) to extend into the arc extinguishing chamber (116) is arranged on the lower side wall (112); and the lower side wall (112) and the static contact (21) are arranged in close contact.

6. The arc extinguishing mechanism of the circuit breaker according to claim 5, characterized in that: The front and rear ends of the lower side wall (112) facing away from the arc extinguishing chamber (116) respectively form a first profile (1121) and a second profile (1122); at least a portion of the first profile (1121) and at least a portion of the second profile (1122) are respectively fitted with the front and rear ends of the static contact (21); and the second profile (1122) extends out of the left side wall (113) and the right side wall (114).

7. The arc extinguishing mechanism of a circuit breaker according to any one of claims 1 to 4, characterized in that: A side of the upper side wall (111) facing away from the arc extinguishing chamber (116) forms an abutment plane (1111), and the abutment plane (1111) is configured to abut against a housing (30) of a circuit breaker; and / or A plurality of weight-reducing grooves (1112) are provided on the upper side wall (111).

8. The arc extinguishing mechanism of a circuit breaker according to any one of claims 1 to 4, characterized in that: The arc extinguishing cover (11) further comprises a rear side wall (115), on which a second avoidance hole (1151) is provided, and the second avoidance hole (1151) is configured to allow a moving contact (23) of a circuit breaker to extend into the arc extinguishing chamber (116).

9. A circuit breaker, characterized in that: It comprises a contact mechanism and the arc extinguishing mechanism as claimed in any one of claims 1 to 8, wherein the contact mechanism comprises a static contact (21), a static contact point (22) and a moving contact (23) arranged on the static contact (21), and the static contact point (22) and the moving contact (23) respectively extend sideways into the arc extinguishing chamber (116).

10. The circuit breaker according to claim 9, characterized in that The circuit breaker further comprises a housing (30), the contact mechanism and the arc extinguishing mechanism are both mounted on the housing (30), and at least a portion of the stationary contact (21) is wrapped between the lower side wall (112) and the housing (30).

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