Arc extinguishing assembly and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses an arc extinguishing assembly and a circuit breaker, and the arc extinguishing assembly comprises a common grid plate group, a middle grid plate group and a reserve grid plate group. The common grid plate group, the reserve grid plate group and the middle grid plate group are respectively provided with a belly part close to a rotating path of the moving contact; when the moving contact moves along the rotation path, the distance from the moving contact to the belly of the middle grid sheet group is smaller than the distance from the moving contact to the belly of the common grid sheet group and the belly of the reserve grid sheet group, so that a first arc striking part is formed on the middle grid sheet group; one side, far away from the common grid sheet group, of the reserve grid sheet group is provided with a run-on plate, and the run-on plate is provided with a second arc-on part which extends towards the moving path of the moving contact. The circuit breaker can improve the arc extinguishing capability of the arc extinguishing assembly, enables the single-pole module to extinguish full-voltage arc, and effectively improves the safety and reliability of the circuit breaker.

Description

Technical Field

[0001] This application relates to the technical field of low-voltage electrical appliances, and more specifically, to an arc extinguishing component and a circuit breaker. Background Art

[0002] In the field of low-voltage electrical appliances, the application requirements of DC2000 - 2500V have been proposed. Therefore, the existing DC1500V products no longer meet the user's needs. To meet the application requirements, the disconnector manufacturers have launched 4P products. Compared with 2P products, the 4P products adopt four pairs of moving contacts, static contacts, and corresponding arc extinguishing components, resulting in the overall volume being twice that of 2P products and the manufacturing cost being higher. If 2P products are used, the voltage borne by a single pole increases, and breakdown failure is likely to occur, and the remaining other pole will bear the full voltage. At this time, if a single pole does not have the ability to break the full voltage, the product and the circuit will be directly damaged. The arc extinguishing components provided by the prior art do not have a reserved breaking margin. In the case of the failure of one pole, the other pole does not have the ability to extinguish the arc of the full voltage, resulting in the safety of the product not being guaranteed. Summary of the Utility Model

[0003] The purpose of this application is to provide an arc extinguishing component and a circuit breaker, which can improve the arc extinguishing ability of the arc extinguishing component, enable the single-pole module to extinguish the arc of the full voltage, and effectively improve the safety and reliability of the circuit breaker.

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, an embodiment of this application provides an arc extinguishing component, which is arranged in cooperation with the contact component inside the circuit breaker. The arc extinguishing component includes a common grid group, an intermediate grid group, and a reserve grid group that are arranged in sequence on one side of the contact component; the contact component includes a static contact and a moving contact that is rotatably arranged inside the circuit breaker; the arrangement direction of the arc extinguishing component is located on the rotation plane of the moving contact; the common grid group, the reserve grid group, and the intermediate grid group all have a belly close to the rotation path of the moving contact; when the moving contact moves along the rotation path, the distance from the moving contact to the belly of the intermediate grid group is less than the distance to the belly of the common grid group and the reserve grid group, so that a first arc initiation part is formed on the intermediate grid group; an arc initiation plate is arranged on the side of the reserve grid group away from the common grid group, and a second arc initiation part extending along the movement path of the moving contact is arranged on the arc initiation plate.

[0006] As an optional implementation manner, the common grid group includes a plurality of first grids arranged at intervals; the reserve grid group includes a plurality of second grids arranged at intervals; the plane where the first grids are located and the plane where the second grids are located are both perpendicular to and intersect with the rotation plane of the moving contact.

[0007] As an alternative embodiment, the intermediate grid group includes at least one intermediate grid; the abdomen of the intermediate grid bulges towards the side close to the rotation path.

[0008] As an alternative embodiment, the protruding distance of the intermediate grid is 1-3 times the gap distance between the intermediate grid and the adjacent first grid or second grid; when the gap distances between the first grid and the intermediate grid and between the second grid and the intermediate grid are different, the smaller value is taken.

[0009] As an alternative embodiment, there are two intermediate grids, and the protruding distance of the abdomen of the most protruding intermediate grid is 1-3 times the gap distance between this intermediate grid and its adjacent intermediate grid and the adjacent first grid or second grid; when the two gap distances are different, the smaller value is taken.

[0010] As an alternative embodiment, there are at least three intermediate grids, and the protruding distance of the abdomen of the most protruding intermediate grid is 1-3 times the gap distance between this intermediate grid and its adjacent intermediate grids; when the two gap distances are different, the smaller value is taken.

[0011] As an alternative embodiment, the planes where the first grid, the second grid, and the intermediate grid are located are parallel to each other.

[0012] As an alternative embodiment, the projection edges of the bellies of the common grid group, the reserve grid group, and the intermediate grid group close to the moving contact on the rotation plane are arc-shaped.

[0013] As an alternative embodiment, the arc shape is an S-shaped line; the S-shaped line gradually moves away from the static contact downward from the middle; the S-shaped line gradually moves away from the opening position of the moving contact upward from the middle.

[0014] As an alternative embodiment, at least the intermediate grid further includes legs, and the abdomen and the legs form a groove with an opening facing the rotation path of the moving contact, and the groove is symmetrically arranged with respect to the rotation plane.

[0015] As an alternative embodiment, the common grid group and / or the reserve grid group are provided with legs extending towards the moving contact side, and the abdomen and the legs form a groove with an opening facing the rotation path of the moving contact, and the groove is symmetrically arranged with respect to the rotation plane.

[0016] As an alternative embodiment, the ratio of the number of grids in the common grid group to the reserve grid group is 2-3.

[0017] In a second aspect, an embodiment of the present application provides a circuit breaker, which includes a circuit breaker housing, a contact assembly, and the above-mentioned arc extinguishing assembly; the contact assembly includes a static contact and a moving contact rotatably arranged in the circuit breaker housing, and an opening facing the arc extinguishing assembly is formed when the moving contact and the static contact are opened; the arc generated on the moving contact enters the arc extinguishing assembly through the first arc guiding portion and / or the second arc guiding portion.

[0018] The beneficial effects of the embodiment of the present application include:

[0019] An embodiment of the present application provides an arc extinguishing assembly, which is cooperatively arranged with the contact assembly inside the circuit breaker. The arc extinguishing assembly of the embodiment of the present application includes a common grid group, an intermediate grid group, and a reserve grid group that are arranged in sequence on one side of the contact assembly. The setting of the reserve grid group greatly improves the arc extinguishing performance of the arc extinguishing assembly. When a pole of the circuit breaker fails, the moving contact stops at a position close to the reserve grid group after the opening operation, so that the arc on the moving contact is transferred to the reserve grid group, and arc extinguishing is achieved through the reserve grid group, the intermediate grid group, and the common grid group.

[0020] The contact assembly of the embodiment of the present application includes a static contact and a moving contact rotatably arranged in the circuit breaker; the arrangement direction of the arc extinguishing assembly is on the rotation plane of the moving contact; the common grid group, the reserve grid group, and the intermediate grid group all have a belly close to the rotation path of the moving contact. When the moving contact of the embodiment of the present application moves along the rotation path, the distance from the moving contact to the belly of the intermediate grid group is less than the distances to the bellies of the common grid group and the reserve grid group, so that a first arc guiding portion is formed on the intermediate grid group. When the moving contact is opened, it first passes through the first arc guiding portion along the rotation path. Since the distance between the moving contact and the first arc guiding portion is small, the arc can enter the intermediate grid group of the arc extinguishing assembly through the first arc guiding portion and run the arc towards the common grid group. At this time, the intermediate grid group and the common grid group achieve arc extinguishing. An arc guiding plate is arranged on the side of the reserve grid group away from the common grid group, and a second arc guiding portion extending towards the movement path of the moving contact is arranged on the arc guiding plate. After passing through the first arc guiding portion, if there is still an arc on the moving contact, when the moving contact rotates to the first arc guiding portion, the arc can enter the reserve grid group, so that the reserve grid group achieves arc extinguishing. Therefore, the embodiment of the present application can improve the arc extinguishing ability of the arc extinguishing assembly, enable the single-pole module to extinguish the full-voltage arc, and effectively improve the safety and reliability of the circuit breaker.

[0021] An embodiment of the present application provides a circuit breaker, which includes a circuit breaker housing, a contact assembly, and the arc extinguishing assembly described above; the contact assembly includes a static contact and a moving contact rotatably arranged in the circuit breaker housing, and the moving contact and the static contact are separated to form an opening facing the arc extinguishing assembly; the arc generated on the moving contact enters the arc extinguishing assembly through the first arc guiding portion and / or the second arc guiding portion. The circuit breaker provided by the embodiment of the present application adopts the above arc extinguishing assembly, and its arc extinguishing ability is greatly improved by the setting of the reserve grid group. In a 2P product, when both pole units are working properly, the moving contact points to the first arc guiding portion, so that the intermediate grid group and the common grid group can cut the arc to extinguish the normal arc. When one of the pole units fails, the moving contact points to the second arc guiding portion, so that the arc enters the reserve grid group from the second arc guiding portion for arc extinguishing. Therefore, the arc extinguishing assembly of the circuit breaker in the embodiment of the present application has a quite high bipolar breaking margin, enabling the single-pole module to extinguish the full-voltage arc and effectively improving the safety and reliability of the circuit breaker. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 One of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0024] Figure 2 Two of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0025] Figure 3 Three of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0026] Figure 4 Four of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0027] Figure 5 Five of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0028] Figure 6 Six of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0029] Figure 7 Seven of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application;

[0030] Figure 8 Eight of the structural schematic diagrams of the arc extinguishing assembly in the embodiment of the present application.

[0031] Icon:

[0032] 100 - Arc extinguishing component; 101 - Common grid group; 102 - Reserve grid group; 103 - Intermediate grid group; 104 - Static contact; 105 - Moving contact; 106 - Rotation path; 107 - First arc - initiating part; 108 - Arc - initiating plate; 109 - Second arc - initiating part; 110 - First grid; 111 - Second grid; 112 - Intermediate grid; 113 - S - shaped line; 114 - Groove; 115 - Circuit breaker housing; D - Protrusion distance; d - Gap distance. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0035] It should be noted that: Similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0037] In the field of low-voltage electrical appliances, the application requirements of DC2000 - 2500V have been put forward. Therefore, the existing DC1500V products no longer meet the user's needs. To meet the application requirements, the disconnector manufacturers have launched 4P products. Compared with the 2P products, the 4P products adopt four pairs of moving contacts 105, static contacts 104 and corresponding arc extinguishing components 100, resulting in the overall volume being twice that of the 2P products and the manufacturing cost being higher. If 2P products are used, the voltage borne by a single pole increases, and breakdown failure is likely to occur. The remaining other pole will bear the full voltage. At this time, if a single pole does not have the ability to break the full voltage, the product and the circuit will be directly damaged. The arc extinguishing component 100 provided by the prior art does not reserve a breaking margin. In the case of the failure of one pole, the other pole does not have the ability to extinguish the arc of the full voltage, resulting in the safety of the product not being guaranteed.

[0038] To solve the above technical problems, the embodiments of the present application provide an arc extinguishing component 100 and a circuit breaker.

[0039] Referring to Figure 1 、 Figure 2 and Figure 3 As shown, the embodiments of the present application provide an arc extinguishing component 100, which is cooperatively arranged with the contact component inside the circuit breaker. The arc extinguishing component 100 includes a common grid group 101, an intermediate grid group 103 and a reserve grid group 102 arranged in sequence on one side of the contact component; the contact component includes a static contact 104 and a moving contact 105 rotatably arranged inside the circuit breaker; the arrangement direction of the arc extinguishing component 100 is located on the rotation plane of the moving contact 105; the common grid group 101, the reserve grid group 102 and the intermediate grid group 103 all have a belly close to the rotation path 106 of the moving contact 105; when the moving contact 105 moves along the rotation path 106, the distance from the moving contact 105 to the belly of the intermediate grid group 103 is less than the distance to the belly of the common grid group 101 and the reserve grid group 102, so that a first arc leading portion 107 is formed on the intermediate grid group 103; an arc leading plate 108 is arranged on the side of the reserve grid group 102 away from the common grid group 101, and a second arc leading portion 109 extending along the movement path of the moving contact 105 is arranged on the arc leading plate 108.

[0040] It should be noted that the arc extinguishing component 100 provided by the embodiments of the present application can be applied not only to 2P circuit breaker products, but also to 3P or 4P products. Those skilled in the art can make a choice according to needs, and no special limitation is made in this regard.

[0041] Exemplarily, in a 2P product, when each pole unit is operating normally, the moving contact 105 points to the first arc - guiding part 107, so that the intermediate grid - plate group 103 and the common grid - plate group 101 can divide the arc to extinguish the normal arc. When one of the pole units fails, the moving contact 105 points to the second arc - guiding part 109, so that the arc enters the reserve grid - plate group 102 from the second arc - guiding part 109 for arc extinguishing. Therefore, the arc - extinguishing assembly 100 of the present application embodiment has a quite high bipolar breaking margin, enabling the single - pole module to extinguish the full - voltage arc and effectively improving the safety and reliability of the circuit breaker.

[0042] It should be noted that the common grid - plate group 101, the intermediate grid - plate group 103, and the reserve grid - plate group 102 of the present application embodiment are arranged in sequence. The common grid - plate group 101 is close to the static contact 104, the reserve grid - plate group 102 is far from the static contact 104 and close to the moving contact 105 at the opening position. When the moving contact 105 is at the opening position, the moving contact 105 and the arc - guiding plate 108 approach each other, so that the dynamic arc root on the moving contact 105 can be transferred to the second arc - guiding part 109, enabling the arc to be transferred into the reserve grid - plate group 102 for extinguishing.

[0043] Among them, during the movement of the moving contact 105 when opening, before reaching the opening position, the middle section of the movement path of the moving contact 105 needs to pass through the first arc - guiding part 107 of the intermediate grid - plate 112. At this time, the moving contact 105 points to the first arc - guiding part 107. Since the distance between the moving contact 105 and the first arc - guiding part 107 is small at this time, the dynamic arc root on the moving contact 105 can be transferred to the first arc - guiding part 107, enabling the intermediate grid - plate group 103 and the common grid - plate group 101 to divide and extinguish the arc.

[0044] The present application embodiment provides an arc - extinguishing assembly 100, which is cooperatively arranged with the contact assembly inside the circuit breaker. The arc - extinguishing assembly 100 of the present application embodiment includes a common grid - plate group 101, an intermediate grid - plate group 103, and a reserve grid - plate group 102 that are arranged in sequence on one side of the contact assembly. The present application embodiment greatly improves the arc - extinguishing performance of the arc - extinguishing assembly 100 through the setting of the reserve grid - plate group 102.

[0045] When one pole of the circuit breaker fails, the moving contact 105 stops at a position close to the reserve grid - plate group 102 after the opening action, enabling the arc on the moving contact 105 to be transferred to the reserve grid - plate group 102 and extinguished through the reserve grid - plate group 102, the intermediate grid - plate group 103, and the common grid - plate group 101.

[0046] The contact assembly of the embodiment of the present application includes a static contact 104 and a moving contact 105 rotatably arranged in the circuit breaker; the arrangement direction of the arc extinguishing assembly 100 is located on the rotation plane of the moving contact 105; the common grid group 101, the reserve grid group 102 and the intermediate grid group 103 all have bellies close to the rotation path 106 of the moving contact 105.

[0047] When the moving contact 105 of the embodiment of the present application moves along the rotation path 106, the distance from the moving contact 105 to the belly of the intermediate grid group 103 is less than the distances to the bellies of the common grid group 101 and the reserve grid group 102, so that a first arc guiding part 107 is formed on the intermediate grid group 103. When the moving contact 105 opens, it moves along the rotation path 106 and first passes through the first arc guiding part 107. Since the distance between the moving contact 105 and the first arc guiding part 107 is small, the arc can enter the intermediate grid group 103 of the arc extinguishing assembly 100 through the first arc guiding part 107 and run the arc towards the common grid group 101. At this time, the intermediate grid group 103 and the common grid group 101 achieve arc extinguishing.

[0048] An arc guiding plate 108 is arranged on the side of the reserve grid group 102 away from the common grid group 101, and a second arc guiding part 109 extending towards the movement path of the moving contact 105 is arranged on the arc guiding plate 108. After passing through the first arc guiding part 107, if there is still an arc on the moving contact 105, when the moving contact 105 rotates to the second arc guiding part 109, the arc can enter the reserve grid group 102, so that the reserve grid group 102 achieves arc extinguishing.

[0049] Therefore, the embodiment of the present application can improve the arc extinguishing ability of the arc extinguishing assembly 100, enable the single-pole module to extinguish the full-voltage arc, and effectively improve the safety and reliability of the circuit breaker.

[0050] Refer to Figure 4 As shown, as an alternative embodiment, the common grid group 101 includes a plurality of first grids 110 arranged at intervals; the reserve grid group 102 includes a plurality of second grids 111 arranged at intervals; the plane where the first grids 110 are located and the plane where the second grids 111 are located are both perpendicular to and intersect with the rotation plane of the moving contact 105.

[0051] Among them, the intermediate grid group 103 includes at least one intermediate grid 112; the belly of the intermediate grid 112 protrudes towards the side close to the rotation path 106.

[0052] It should be noted that the plane where the intermediate grid 112 is located is also perpendicular to and intersects with the rotation plane of the moving contact 105.

[0053] Further, refer to Figure 5 And Figure 8As shown, the grid plates in the grid plate assembly composed of the first grid plate 110, the second grid plate 111 and the intermediate grid plate group 103 also have legs. A groove 114 is formed between the abdomen and the legs, with the opening of the groove facing the rotation path 106 of the moving contact 105. The two sides of the groove 114 are symmetrically arranged with respect to the rotation plane.

[0054] It should be noted that the technical effect of the embodiment of the present application is mainly achieved by the abdomen, and the legs on the above-mentioned grid plates can be set as needed.

[0055] Specifically, at least the intermediate grid plate group 103 is provided with legs extending towards the moving contact 105; the legs are symmetrically arranged with respect to the rotation plane, and a groove 114 structure can be formed between the two legs and the abdomen.

[0056] Furthermore, the first grid plate 110 and the second grid plate 111 are provided with legs extending towards the moving contact 105, and a groove 114 is formed between the abdomen and the legs, with the opening of the groove facing the rotation path 106 of the moving contact 105. The groove 114 is symmetrically arranged with respect to the rotation plane.

[0057] During the rotation of the moving contact 105, it can pass through the groove 114. In particular, when the moving contact 105 passes through the first arcing portion 107, the moving contact 105 is inserted into the groove 114, so that the moving contact 105 is located in the groove 114 opened on the intermediate grid plate 112, facilitating the intermediate grid plate 112 serving as the first arcing portion 107 to have a larger contact surface close to the moving contact 105, ensuring that the arc moving arc root on the moving contact 105 can be quickly transferred to the intermediate grid plate 112.

[0058] Referring to Figure 5 As shown, according to needs, the three surfaces of the groove 114 on the intermediate grid plate 112 serving as the first arcing portion 107 can be made to have the same distance to the moving contact 105, and all are close to the surface of the moving contact 105.

[0059] Furthermore, it should be noted that the arc stretching length provides the arc column voltage drop, and the grid plates cutting the arc provide the near-pole voltage drop. Every two grid plates jointly cut the arc, which can provide a voltage of 25 - 35V. Among them, those skilled in the art can select the number of grid plates as needed, and no special limitation is made in this regard.

[0060] Exemplarily, when the single-pole breaking is 2000V, the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is approximately 58 - 80 pieces, where the middle grid pieces 112 are the 39th - 54th pieces counted from the fixed contact 104 end. Among them, the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 is 2 - 3. Specifically, when the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is 58, there are three middle grid pieces 112, which are the 39th, 40th and 41st respectively. Among them, there are 38 first grid pieces 110, 17 second grid pieces 111, and the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 is 2.2.

[0061] Exemplarily, when the single-pole breaking is 1500V, the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is approximately 50 - 60 pieces, where the middle grid pieces 112 are the 34th - 40th pieces counted from the fixed contact 104 end. Specifically, when the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is 50, there are three middle grid pieces 112, which are the 34th, 35th and 36th respectively. Among them, there are 33 first grid pieces 110, 14 second grid pieces 111, and the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 is 2.4.

[0062] Exemplarily, when the single-pole breaking is 1000V, the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is approximately 29 - 40 pieces, where the middle grid pieces 112 are the 20th - 27th pieces counted from the fixed contact 104 end. Specifically, when the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is 29, there are three middle grid pieces 112, which are the 20th, 21st and 22nd respectively. Among them, there are 19 first grid pieces 110, 7 second grid pieces 111, and the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 is 2.7.

[0063] Exemplarily, when the single-pole breaking is 750V, the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is approximately 22 - 30 pieces, where the middle grid pieces 112 are the 15th - 20th pieces counted from the fixed contact 104 end. Specifically, when the total number of the first grid pieces 110, the second grid pieces 111 and the middle grid pieces 112 is 22, there are three middle grid pieces 112, which are the 15th, 16th and 17th respectively. Among them, there are 14 first grid pieces 110, 5 second grid pieces 111, and the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 is 2.8.

[0064] Exemplarily, when the single-pole breaking is 500V, the total number of the first grid pieces 110, the second grid pieces 111, and the intermediate grid pieces 112 is approximately 15 - 20 pieces, and the intermediate grid pieces 112 are the 10th - 14th pieces counted from the static contact 104 end. Specifically, when the total number of the first grid pieces 110, the second grid pieces 111, and the intermediate grid pieces 112 is 15, there are three intermediate grid pieces 112, which are the 10th, 11th, and 12th respectively. Among them, there are 9 first grid pieces 110 and 3 second grid pieces 111, and the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 is 3.

[0065] Through the above settings, the embodiments of the present application can ensure that the arcing time is within about 20 ms during normal bipolar breaking, and within about 100 ms during single-pole breaking. This not only ensures the number of normal breakings but also guarantees a certain single-pole breaking ability.

[0066] For the specific ratio data of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102, those skilled in the art can set it according to needs. It should be noted that the above-disclosed embodiments make the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 being 2 - 3 a preferable arrangement. In a specific product structure, those skilled in the art can adjust this ratio, for example, making the ratio of the number of grid pieces of the common grid piece group 101 and the reserve grid piece group 102 being 1, or other data.

[0067] Referring to Figure 7 As shown, as an optional implementation manner, the protruding distance D of the abdomen of the intermediate grid piece 112 is 1 - 3 times the gap distance d between the intermediate grid piece 112 and the adjacent first grid piece 110 or second grid piece 111.

[0068] It should be noted that since the distance from the moving contact 105 to the abdomen of the intermediate grid piece group 103 is less than the distances to the abdomen of the common grid piece group 101 and the corresponding abdomen of the reserve grid piece group 102, from the direction perpendicular to the rotation plane of the moving contact 105, the abdomen of the intermediate grid piece group 103 protrudes from the abdomens of the adjacent first grid piece 110 and second grid piece 111.

[0069] If there is one intermediate grid piece 112, the protruding distance D of the abdomen of the intermediate grid piece 112 is 1 - 3 times the gap distance d between the intermediate grid piece 112 and the adjacent first grid piece 110 and second grid piece 111. If the two d values are different, d is taken as the smaller value.

[0070] If there are two intermediate grid pieces 112, the protruding distance D of the abdomen of the most protruding intermediate grid piece 112 is 1 - 3 times the gap distance d between this intermediate grid piece 112 and its adjacent intermediate grid piece 112 and the adjacent first grid piece 110 or second grid piece 111. If the two d values are different, d is taken as the smaller value.

[0071] When there are at least three intermediate grid plates 112, the protruding distance D of the abdomen of the most protruding intermediate grid plate 112 is 1-3 times the gap distance d between this intermediate grid plate 112 and its adjacent intermediate grid plate 112. If the two d values are different, d is taken as the smaller value.

[0072] Exemplarily, there are three intermediate grid plates 112 that all protrude, and the distances between the intermediate grid plate 112 in the middle and its adjacent intermediate grid plates 112 on both sides are the same. Then the protruding distance D of the intermediate grid plate 112 in the middle is 2 times the distance between its adjacent intermediate grid plates 112 on both sides.

[0073] That is to say, the protruding distance D of the intermediate grid plate 112 cannot be too large, otherwise it will affect the arc entering the upper second grid plate 111, resulting in the second grid plate 111 being ineffective during single-pole breaking.

[0074] As an alternative implementation, the planes where the first grid plate 110, the second grid plate 111, and the intermediate grid plate 112 are located are parallel to each other.

[0075] Referring to Figure 6 As shown, as an alternative implementation, the projections of the edges of the abdomen of the common grid plate group 101, the reserve grid plate group 102, and the intermediate grid plate group 103 near the moving contact 105 on the rotation plane are arc-shaped. Exemplarily, the arc shape is an S-shaped line 113; the S-shaped line 113 gradually moves away from the static contact 104 downward from the middle; the S-shaped line 113 gradually moves away from the opening position of the moving contact 105 upward from the middle. Then the grid plate located in the middle of the S-shaped line 113 is the intermediate grid plate 112.

[0076] Referring to Figure 4 、 Figure 6 As shown, an embodiment of the present application provides a circuit breaker, including a circuit breaker housing 115, a contact assembly, and the above-mentioned arc extinguishing assembly 100; the contact assembly includes a static contact 104 and a moving contact 105 rotatably arranged in the circuit breaker housing 115, and the moving contact 105 and the static contact 104 are opened to form an opening facing the arc extinguishing assembly 100; the arc generated on the moving contact 105 enters the arc extinguishing assembly 100 through the first arc guiding portion 107 and / or the second arc guiding portion 109.

[0077] The circuit breaker provided by the embodiment of the present application adopts the above-mentioned arc extinguishing assembly 100, and its arc extinguishing ability is greatly improved by the setting of the reserve grid plate group 102.

[0078] In the 2P product, when each pole unit is operating normally, the moving contact 105 points to the first arc ignition part 107, so that the intermediate grid group 103 and the common grid group 101 can cut the arc to extinguish the normal arc. When one of the pole units fails, the moving contact 105 points to the second arc ignition part 109, so that the arc enters the reserve grid group 102 from the second arc ignition part 109 for arc extinguishing. Therefore, the arc extinguishing component 100 of the circuit breaker in the embodiment of the present application has a quite high bipolar breaking margin, enabling the single-pole module to extinguish the full-voltage arc and effectively improving the safety and reliability of the circuit breaker.

[0079] The foregoing is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An arc extinguishing component (100), which is cooperatively arranged with a contact component inside a circuit breaker, is characterized in that, The arc extinguishing component (100) includes a common grid group (101), an intermediate grid group (103), and a reserve grid group (102) which are arranged in sequence on one side of the contact component; the contact component includes a static contact (104) and a moving contact (105) rotatably arranged in the circuit breaker; the arrangement direction of the arc extinguishing component (100) is located on the rotation plane of the moving contact (105); the common grid group (101), the reserve grid group (102), and the intermediate grid group (103) all have a belly close to the rotation path (106) of the moving contact (105); when the moving contact (105) moves along the rotation path (106), the distance from the moving contact (105) to the belly of the intermediate grid group (103) is less than the distances to the bellies of the common grid group (101) and the reserve grid group (102), so that a first arc leading part (107) is formed on the intermediate grid group (103); an arc leading plate (108) is arranged on the side of the reserve grid group (102) away from the common grid group (101), and a second arc leading part (109) extending along the movement path of the moving contact (105) is arranged on the arc leading plate (108).

2. The arc extinguishing component (100) according to claim 1, characterized in that, The common grid group (101) includes a plurality of first grids (110) arranged at intervals; the reserve grid group (102) includes a plurality of second grids (111) arranged at intervals; the planes where the first grids (110) are located and the planes where the second grids (111) are located are both perpendicular to and intersect with the rotation plane of the moving contact (105).

3. The arc extinguishing component (100) according to claim 2, characterized in that, The intermediate grid group (103) includes at least one intermediate grid (112); the belly of the intermediate grid (112) protrudes towards the side close to the rotation path (106).

4. The arc extinguishing component (100) according to claim 3, characterized in that, The protruding distance (D) of the intermediate grid (112) is 1-3 times the gap distance (d) between the intermediate grid (112) and the adjacent first grid (110) or second grid (111); when the gap distances (d) between the first grid (110) and the intermediate grid and between the second grid (111) and the intermediate grid are different, the smaller value is taken.

5. The arc extinguishing component (100) according to claim 3, characterized in that, There are two intermediate grids (112), and the protruding distance (D) of the belly of the most protruding intermediate grid (112) is 1-3 times the gap distance (d) between this intermediate grid (112) and its adjacent intermediate grid (112) and the adjacent first grid (110) or second grid (111); when the two gap distances (d) are different, the smaller value is taken.

6. The arc extinguishing component (100) according to claim 3, characterized in that There are at least three intermediate grids (112), and the protruding distance (D) of the belly of the most protruding intermediate grid (112) is 1-3 times the gap distance (d) between this intermediate grid (112) and its adjacent intermediate grids (112); when the two gap distances (d) are different, the smaller value is taken.

7. The arc extinguishing component (100) according to claim 3, characterized in that, The planes where the first grids (110), the second grids (111), and the intermediate grids (112) are located are parallel to each other.

8. The arc extinguishing component (100) according to claim 1, characterized in that, The projection edges of the abdomen of the common grid group (101), the reserve grid group (102), and the intermediate grid group (103) close to the moving contact (105) on the rotation plane are arc-shaped.

9. The arc extinguishing component (100) according to claim 8, characterized in that, The arc shape is an S-shaped line (113); the S-shaped line (113) gradually moves away from the static contact (104) downward from the middle; the S-shaped line (113) gradually moves away from the opening position of the moving contact (105) upward from the middle.

10. The arc extinguishing component (100) according to any one of claims 3-7, characterized in that, At least the intermediate grid (112) further includes legs, and the abdomen and the legs form a groove (114) with an opening facing the rotation path (106) of the moving contact (105), and the groove (114) is symmetrically arranged with respect to the rotation plane.

11. The arc extinguishing component (100) according to claim 1, characterized in that, The common grid group (101) and / or the reserve grid group (102) are provided with legs extending toward the moving contact (105), and the abdomen and the legs form a groove (114) with an opening facing the rotation path (106) of the moving contact (105), and the groove (114) is symmetrically arranged with respect to the rotation plane.

12. The arc extinguishing component (100) according to any one of claims 1-9, characterized in that, The ratio of the number of grids of the common grid group (101) to the reserve grid group (102) is 2-3.

13. A circuit breaker, characterized in that, It includes a circuit breaker housing (115), a contact assembly, and the arc extinguishing assembly (100) according to any one of claims 1-12; the contact assembly includes a static contact (104) and a moving contact (105) rotatably arranged in the circuit breaker housing (115), and the moving contact (105) and the static contact (104) are opened to form an opening facing the arc extinguishing assembly (100); the arc generated on the moving contact (105) enters the arc extinguishing assembly (100) through the first arc guiding portion (107) and / or the second arc guiding portion (109).

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