Switch

Abstract

The invention discloses a switch, which comprises a shell, at least one breaking space is arranged in the shell, a first contact, a second contact and an arc extinguishing grid group are arranged in each breaking area, and the first contact and the second contact have a first separated state and a second contacted state; wherein the breaking space comprises an electric arc generation area used for accommodating the first contact and the second contact; the grid sheet accommodating area is used for accommodating the arc extinguishing grid sheet group and is positioned below the arc generation area in the first direction; the first exhaust channel and the second exhaust channel are respectively arranged on two sides of the arc extinguishing grid sheet group in the second direction and communicate the grid sheet accommodating area with the outside; the first exhaust channel is closer to an arc generation area than the second exhaust channel, and at least one part of the first exhaust channel is of a narrow-mouth structure; the caliber of the narrow-mouth structure is smaller than that of any position of the second exhaust channel; the first direction is perpendicular to the second direction; the arc extinguishing device has the advantage of being good in arc extinguishing effect.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical equipment, specifically to a switch, namely a circuit breaker or a disconnecting switch. Background Technology

[0002] Molded case switches are a common type of switch in the low-voltage electrical field, used to connect to circuits to provide overload, short-circuit protection, and so on.

[0003] In a conventional molded case circuit breaker, the arc-extinguishing chamber and contacts are arranged along the length direction, and the molded case circuit breaker also has corresponding vent holes on the casing, through which arc gas can be discharged.

[0004] With increasing performance requirements for molded case circuit breakers, conventional molded case circuit breaker designs are no longer suitable for high-voltage scenarios.

[0005] Therefore, a novel molded case circuit breaker design has been developed in this field, in which the contacts are located above the arc-extinguishing chamber in the height direction. This molded case circuit breaker has a large arc-extinguishing chamber space, so it can accommodate a large number of arc-extinguishing grids.

[0006] However, increasing the number of arc-extinguishing grid plates does not necessarily mean that these plates can be fully utilized. Therefore, for this new type of molded case circuit breaker, how to design a more reasonable gas passage to fully utilize the arc-extinguishing grid plates for arc extinguishing becomes another issue. Summary of the Invention

[0007] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a switch.

[0008] This application provides: a switch comprising a housing, wherein at least one breaking space is provided within the housing, and each breaking space is provided with a first contact, a second contact, and an arc-extinguishing grid assembly, wherein the first contact and the second contact have a first separated state and a second contacting state; wherein the breaking space includes, The area where the electric arc is generated is used to accommodate the first contact and the second contact; The grid receiving area is used to receive the arc-extinguishing grid assembly and is located below the arc-generating area in the first direction; The first exhaust channel and the second exhaust channel are respectively arranged on both sides of the arc-extinguishing grid plate group in the second direction and both connect the grid plate accommodating area with the outside. The first exhaust channel is closer to the arc generation area than the second exhaust channel, and at least part of the first exhaust channel has a narrow opening structure. The diameter of the narrow-mouth structure is smaller than the diameter of the second exhaust channel at any location. The first direction is perpendicular to the second direction.

[0009] In some embodiments of the present application, the narrow - mouth structure is only constructed by the housing.

[0010] In some embodiments of the present application, the narrow - mouth structure is jointly constructed by the housing and a blocking member fixed on the housing.

[0011] In some embodiments of the present application, the arc - extinguishing grid - plate group includes an arc - extinguishing grid - plate cover housing. The arc - extinguishing grid - plate group is fixed on the arc - extinguishing grid - plate cover housing. The arc - extinguishing grid - plate cover housing is provided with a first opening and a second opening. The first opening is a part of the first exhaust passage, and the second opening is a part of the second exhaust passage; the narrow - mouth structure is constructed by the housing, or the narrow - mouth structure is jointly constructed by the housing and the first opening, or the narrow - mouth structure is the first opening.

[0012] In some embodiments of the present application, the narrow - mouth structure is a single - hole structure.

[0013] In some embodiments of the present application, the narrow - mouth structure is a multi - hole structure, the number of holes is N, 1 < N ≤ 5, and the diameter is the sum of the sizes of all the holes.

[0014] In some embodiments of the present application, the diameter of the narrow - mouth structure is R1, and the diameter of the smallest - diameter part in the second exhaust passage is R2, 0.2R2 ≤ R1 ≤ 0.8R2.

[0015] In some embodiments of the present application, the entire first exhaust passage is a narrow - mouth structure, and the diameter of any part thereof is smaller than the diameter at any position in the second exhaust passage.

[0016] In some embodiments of the present application, a part of the first exhaust passage is a narrow - mouth structure, and the diameter at the narrow - mouth structure is smaller than the diameter of the rest of the first exhaust passage.

[0017] In some embodiments of the present application, at least one layer of filtering structure is provided in both the first exhaust passage and the second exhaust passage, and the number of filtering structures in the second exhaust passage is not more than the number of filtering structures in the first exhaust passage.

[0018] In some embodiments of the present application, at least one layer of filtering structure is provided in both the first exhaust passage and the second exhaust passage. The narrow - mouth structure in the first exhaust passage is closer to the arc - extinguishing grid - plate group than the filtering structure.

[0019] In some embodiments of the present application, the first exhaust passage includes a first exhaust port communicating with the outside, a first air inlet connected to the grid - plate accommodation area, and an intermediate area between the first exhaust port and the first air inlet. The narrow - mouth structure is provided at the first exhaust port or the first air inlet or the intermediate area.

[0020] In some embodiments of the present application, the diameter of the second exhaust passage is different at least at two places.

[0021] In some embodiments of this application, the arc-extinguishing grid assembly includes a first grid cluster and a second grid cluster; in the second direction, the first exhaust channel and the second grid cluster are located on opposite sides of the first grid cluster, and the second exhaust channel is located on the side of the second grid cluster away from the first grid cluster; the grid feet of some of the arc-extinguishing grids in the first grid cluster extend to the arc-generating region, or the total length of the second grid cluster in the second direction is greater than the total length of the first grid cluster in the second direction, or the number of arc-extinguishing grids in the second grid cluster is greater than the number of arc-extinguishing grids in the first grid cluster.

[0022] In some embodiments of this application, the arc-extinguishing grids in the second grid cluster are arranged sequentially along a preset direction, and the tilt angle of each arc-extinguishing grid relative to the first direction is no greater than 20°. The tilt angle of each arc-extinguishing grid is different, and the tilt angle is larger the closer it is to the second exhaust channel.

[0023] In some embodiments of this application, each arc-extinguishing grid in the second grid cluster is inclined and forms an angle with the first direction, and each arc-extinguishing grid in the first grid cluster is inclined and forms an angle with the first direction. The degree of inclination of each arc-extinguishing grid in the second grid cluster is greater than the degree of inclination of each arc-extinguishing grid in the first grid cluster.

[0024] In some embodiments of this application, the first grid cluster includes a first grid sub-cluster and a second grid cluster. The first grid sub-cluster is disposed near the first exhaust channel, and the second grid cluster is disposed near the second grid cluster. The arc-extinguishing grids in the first grid sub-cluster and the arc-extinguishing grids in the second arc-extinguishing grid cluster are both inclined, and their inclination directions are opposite. The inclination degree of each arc-extinguishing grid in the first grid sub-cluster is less than the inclination degree of each arc-extinguishing grid in the second arc-extinguishing grid cluster.

[0025] The advantages of this application compared to the prior art are: This application employs a dual-channel configuration, with a narrow opening in the channel closer to the breakup area. By utilizing the reduced diameter of this narrow opening, a gas pressure difference can be effectively created, allowing the gas to more easily enter and exit the far-arc side channel (the channel farther from the arc generation area) compared to existing technologies. This ensures that the arc-extinguishing grids within the arc-extinguishing grid assembly are fully utilized. The inventors discovered through research that if the two sides use the same size channel structure, the gas will concentrate and flow out through the arc-entry side channel (the channel closer to the arc generation area), resulting in a very low utilization rate of the far-arc side channel. Consequently, the corresponding arc-extinguishing grids in the far-arc side channel will also not be fully utilized. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A cross-sectional view of the housing of the switch according to an embodiment of this application is shown; Figure 2 A schematic diagram of the arc-extinguishing grid assembly of the switch according to an embodiment of this application is shown; Figure 3 A cross-sectional view of a switch according to an embodiment of this application is shown; Figure 4 A schematic diagram of a narrow-mouth structure in an embodiment of this application is shown; Figure 5 A schematic diagram of another narrow-mouth structure in an embodiment of this application is shown; Figure 6 A schematic diagram of the narrow-mouth structure at the first air inlet in an embodiment of this application is shown; Figure 7 A schematic diagram of the narrow-mouth structure at the first exhaust port in an embodiment of this application is shown; Figure 8 This illustration shows a schematic diagram of the narrow opening structure in the middle region in an embodiment of this application; Figure 9 A schematic diagram of all the arc-extinguishing grid plates in the arc-extinguishing grid plate group in an embodiment of this application is shown. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0033] like Figure 1-9 As shown in the figure, an embodiment of this application is a switch, specifically a molded case circuit breaker in the field of low-voltage electrical equipment.

[0034] The switch includes a housing, and at least one breaking space M1 is provided inside the housing. Each breaking space is provided with a first contact 100, a second contact 200, and an arc-extinguishing grid group 300.

[0035] Here, the interior of the shell can contain only one partition space M1, or it can contain multiple partition spaces M1, such as two, three, four, or even more.

[0036] Here, the housing can be the outer shell of the circuit breaker (equivalent to the outermost housing of the circuit breaker), or part of the outer shell of the circuit breaker (equivalent to part of the outermost housing of the circuit breaker), or the housing can be only a contact box (used only to house contacts, arc-extinguishing chambers, trip units, etc.).

[0037] There are many forms of shell composition, including: The housing can be made up of two halves, which are joined together in the width direction to form the housing and also form the separation space M1. This is applicable when only one separation space M1 is set in the housing, or when the housing is only a contact box.

[0038] The housing can take the form of an upper housing 10 and a lower housing 20, that is, the upper housing 10 and the lower housing 20 are combined in the height direction to form a dividing space M1. This is applicable to cases where only one dividing space M1 is provided in the housing, cases where multiple dividing spaces M1 are provided in the housing, or cases where the housing is only a contact box. In this embodiment, the housing is adopted in the form of an upper housing 10 and a lower housing 20 combined.

[0039] Regardless of the form, the segmentation space M1 has an arc generation area M10, a grid plate accommodating area M20, a first exhaust channel M30, and a second exhaust channel M40.

[0040] The arc-generating region M10 is used to accommodate the first contact 100 and the second contact 200. Here, the first contact 100 is equivalent to a moving contact, and the second contact 200 is equivalent to a stationary contact. Of course, for a structure where the stationary contact can flip, the second contact 200 is equivalent to a second moving contact. In either case, the first contact 100 has a first state in contact with the second contact 200, and a second state in which the two are separated from each other.

[0041] The inclusion of the first contact 100 and the second contact 200 here means that the first contact 100 and the second contact 200 only need to be within the arc-generating region M10, and it is not necessary for the entire moving contact or the entire stationary contact to be within the arc-generating region M10. Taking the moving contact and stationary contact as an example, it can be that the stationary contact, the entire moving contact, and the rotating shaft are all within the arc-generating region M10 of the housing; or it can be that the rotating shaft and part of the moving contact are located outside the housing, with only one end of the moving contact with the first contact 100 and the stationary contact located within the arc-generating region M10.

[0042] The grid receiving area M20 is used to accommodate the arc-extinguishing grid assembly 300 and is located below the arc-generating area M10 in the first direction F1 (which can also be described as the height direction). There are several ways to fix the arc-extinguishing grid assembly 300. For example, slots can be opened in the grid receiving area M20 within the housing, and the arc-extinguishing grids of the arc-extinguishing grid assembly 300 can be directly inserted into the slots; alternatively, each arc-extinguishing grid of the arc-extinguishing grid assembly 300 can be fixed by two insulating plates, forming a whole and then placed within the grid receiving area M20; furthermore, the arc-extinguishing grid assembly 300 can be divided into multiple sub-groups, each fixed by two insulating plates, effectively making multiple arc-extinguishing grid assemblies 300 each a whole, all placed sequentially within the grid receiving area M20; still more specifically, all the arc-extinguishing grids of the arc-extinguishing grid assembly 300 can be fixed by the cover 310 to form a whole and placed within the grid receiving area M20.

[0043] The first exhaust channel M30 and the second exhaust channel M40 are respectively arranged on both sides of the arc-extinguishing grid plate group 300 in the second direction F2 (or the length direction), and both connect the grid plate receiving area M20 to the outside.

[0044] Here, since the arc-extinguishing grid assembly 300 is not a symmetrical structure centered on the arc-generating region M10, one exhaust channel will be closer to the arc-generating region M10 than the other exhaust channel. In this embodiment, the first exhaust channel M30 is closer to the arc-generating region M10 than the second exhaust channel M40.

[0045] In order to create a gas pressure difference, at least a portion of the first exhaust passage M30 is a narrow opening structure S, where the diameter of the narrow opening structure S is smaller than the diameter of the second exhaust passage M40 at any position.

[0046] Due to the reduced diameter, although the first exhaust channel M30 is closer to the arc generation area M10, the reduced diameter can effectively create a gas pressure difference, making it easier for the gas to enter the far-arc side air passage (the air passage farther from the arc generation area M10) for discharge compared to existing technologies, thus allowing the arc-extinguishing grids in the arc-extinguishing grid assembly 300 to be fully utilized.

[0047] Here, at least a portion is a narrow-mouth structure S. This can be a situation where the entire first exhaust passage M30 is a narrow-mouth structure S, or it can be a situation where only a certain part is a narrow-mouth structure S, or it can be a situation where multiple parts are narrow-mouth structures.

[0048] When the entire first exhaust channel M30 is a narrow-mouth structure S, the diameter of the first exhaust channel M30 at any point is smaller than the diameter at any point in the second exhaust channel M40. This overall narrow-mouth structure S design is very simple to form, can create a larger pressure difference, and ensures that the electric arc can more easily enter the exhaust channel at the far end of the arc.

[0049] In the case of a partially narrow-orifice structure S, only one or a few parts of the first exhaust channel M30 have a narrow-orifice structure S, while the diameter of the remaining parts of the first exhaust channel M30 (non-narrow-orifice structures) is larger than the diameter of the narrow-orifice structure S. This partially narrow-orifice structure S is equivalent to forming a Laval nozzle-like structure inside the first exhaust channel M30, which can increase the flow velocity of the arc gas after passing through the narrow-orifice structure S, thereby improving the arc-extinguishing capability of the entire product.

[0050] There are many ways to form a narrow opening. It can be constructed solely from the shell, meaning the first exhaust channel M30 is constructed entirely from the shell, directly forming the narrow opening structure S. This method makes the forming of the narrow opening structure S very simple, requiring no additional components.

[0051] Alternatively, it can be constructed by a shell and a blocking member Z fixed on the shell. The form in which the blocking member Z and the shell are formed is divided into two types.

[0052] One type involves a casing that has already formed a preliminary first exhaust channel M30. The diameter of this first channel is reduced by the installation of a blocking element Z, creating a narrow-mouth structure S. In this case, the casing construction is relatively simple; only the additional blocking element Z is needed to form the narrow-mouth structure S.

[0053] Another scenario involves the housing not yet forming the initial exhaust channel M30, where it, together with the blocking component Z, forms a complete first exhaust channel M30 and simultaneously creates a narrow opening structure S. In this case, the housing structure is relatively more complex, but it can still form the narrow opening structure S.

[0054] Alternatively, the narrow opening structure can be directly set on the blocking component Z, which is formed by the blocking component Z being installed into the housing.

[0055] As a relatively preferred method, the arc extinguishing grid group 300 is fixed on the cover 310. The cover 310 is respectively provided with a first opening 310a and a second opening 310b on both sides in the second direction F2. The first opening 310a is a part of the first exhaust passage M30, and the second opening 310b is a part of the second exhaust passage M40. The size of the first opening 310a is smaller than that of the second opening 310b. Therefore, the first opening 310a and the inner wall of the housing together form a narrow opening structure S. In this way, the cover 310 of the arc extinguishing chamber is used as the blocking member Z, and the forming method is very simple. At the same time, the narrow opening can be made closer to the arc extinguishing grid group 300 (that is, the entrance of the first exhaust passage M30), so that a gas pressure difference can be formed within the arc extinguishing grid group 300, making it smoother for the arc gas to enter the second exhaust passage M40.

[0056] Of course, in the way that the arc extinguishing grid group 300 includes the structure of the cover 310, the first opening 310a and the second opening 310b can also be set to the same size, and the narrow opening structure S is formed by the housing structure or completed by the housing and other blocking members Z.

[0057] It is worth mentioning that regardless of the above-mentioned narrow opening structure S, it includes a single-hole form and also a multi-hole form (but not more than 5).

[0058] Taking the single-hole form as an example, its caliber is equivalent to the size of a single hole. The forming structure of the single-hole structure is the simplest and can also ensure the gas flow rate.

[0059] Taking the multi-hole form as an example, the number of holes is N, and 1 < N ≤ 5. The caliber of the narrow opening structure S is the sum of the sizes of all the holes. Although the structure of the multi-hole method is relatively more complex, it can ultimately also form the function of the narrow opening structure S.

[0060] Here, the shape of the hole can be set arbitrarily, it can be rectangular, square, circular, or some irregular shapes.

[0061] Here, the caliber of the narrow opening structure S is R1, and the caliber of the smallest part of the second exhaust passage M40 is R2, 0.2R2 ≤ R1 ≤ 0.8R2. That is to say, the ratio of the caliber of the narrow opening structure S to the smallest caliber of the second exhaust passage M40 is between 1:5 and 4:5. This proportional relationship can ensure the effective generation of the gas pressure difference.

[0062] At least one layer of filter structure 500 is provided in both the first exhaust channel M30 and the second exhaust channel M40, and the number of filter structures 500 in the second exhaust channel M40 is no more than the number of filter structures 500 in the first exhaust channel M30. In this embodiment, each exhaust channel is provided with four layers of filter structures 500. The filter structures 500 can be chosen from many options, such as a perforated insulating plate or a perforated metal plate, a metal mesh, or multiple spaced columnar structures.

[0063] Regardless of the structure, the goal is to ensure that the flowing gas passes through the filter structure 500 to remove metal particles. The reason for using no more filter structures 500 in the second exhaust channel M40 than in the first exhaust channel M30 is that the filter structure 500 itself has a certain obstructive effect on airflow (obstruction on one side makes it easier for airflow to flow to the other side), which affects the pressure difference. Setting the same number of filter structures 500 on both sides, or setting fewer filter structures 500 in the second exhaust channel M40, effectively "cancels out" the effects on both sides, ultimately allowing the arc gas to flow fully into the second exhaust channel M40.

[0064] For the partial narrow-mouth structure S, the first exhaust channel M30 is divided into a first exhaust port M301, a first air inlet M302, and an intermediate region M303. The first exhaust port M301 is connected to the outside, the first air inlet M302 is connected to the grid receiving area M20, and the intermediate region M303 is located between the first exhaust port M301 and the first air inlet M302.

[0065] Here, the narrow-mouth structure S can be set at the first air inlet M302 (the effect is the best, and the gas can directly generate a good gas pressure difference at the arc extinguishing grid assembly 300), the narrow-mouth structure S can be set in the middle region M303 (the effect is relatively worse, but it can still generate a good gas pressure difference), and the narrow-mouth structure S can be set at the first exhaust port M301 (the effect is even worse, but it can still form a gas pressure difference).

[0066] Here, for the second exhaust passage M40, it can be an exhaust passage with a uniform diameter at all points, or it can be two or more exhaust passages with different diameters. For example, it can have a structure where the diameter gradually increases from inside the housing to outside the housing, or a structure where the diameter gradually decreases, or a structure with two sections of different diameters.

[0067] For the arc-extinguishing grid assembly 300, the arc-extinguishing grid assembly 300 includes a first grid cluster and a second grid cluster 300a.

[0068] The first cluster of arc-extinguishing grids contains several arc-extinguishing grids, such as 17, but more or fewer arc-extinguishing grids can also be used.

[0069] The second grid cluster 300a contains several arc-extinguishing grids, such as 30, but more or fewer arc-extinguishing grids can also be used.

[0070] In the second direction F2, the first exhaust passage M30 and the second grille cluster 300a are located on both sides of the first grille cluster, and the second exhaust passage M40 is located on the side of the second grille cluster 300a away from the first grille cluster.

[0071] This arrangement of arc-extinguishing grid clusters, combined with the narrow-mouth structure S, allows arc gas to pass through a large number of arc-extinguishing grids into the second exhaust channel M40. By making full use of these arc-extinguishing grids, it can adapt to higher arc voltages and improve arc-extinguishing capability.

[0072] Here, the grid feet of some of the arc-extinguishing grids within the first grid cluster extend to the arc-generating region M10. This design is more conducive to arc extinguishing and to the full utilization of the arc-extinguishing grids.

[0073] Here, the total length of the second grid cluster 300a in the second direction F2 is greater than the total length of the first grid cluster in the second direction F2.

[0074] Here, each arc-extinguishing grid in the second grid cluster 300a has an angle with the first direction F1 (equivalent to tilting towards the direction of the second exhaust channel M40). The degree of tilt of each arc-extinguishing grid in the second grid cluster 300a is different, specifically, it is positively correlated with the distance from the first grid cluster. The farther away, the larger the tilt angle, but the maximum angle is no more than 20°.

[0075] Unlike existing technologies where arc-extinguishing grids are arranged in parallel, this type of arc-extinguishing grid, with its angle, inclination, and arrangement, forms a gradually changing pattern. The closer the arc-extinguishing grid is to the second exhaust channel M40, the more inclined it becomes (equivalent to being more oriented towards the second exhaust channel M40). This adapts to the trajectory of the electric arc, effectively reduces the obstruction of the arc gas, and ensures that the arc gas enters the second exhaust channel M40 more smoothly, which is conducive to the full utilization of the arc-extinguishing grid.

[0076] Here, each arc-extinguishing grid in the second grid cluster 300a has an angle with the first direction F1 and is tilted toward the direction of the second exhaust channel M40. Each arc-extinguishing grid in the first grid cluster is tilted and has an angle with the first direction F1. The tilt of each arc-extinguishing grid in the second grid cluster 300a is greater than the tilt of each arc-extinguishing grid in the first grid cluster.

[0077] Since the arc-extinguishing grids in the first grid cluster are closer to the arc-generating region M10, their tilt is smaller than that of the arc-generating region to accommodate the flow of arc gas in this area. The arc-extinguishing grid group 300 in the second grid cluster 300a adopts a more tilted angle to accommodate the flow of arc gas in this area. This non-perfectly parallel structure of the arc-extinguishing grids is more conducive to the flow of arc gas and to the full utilization of the arc-extinguishing grids.

[0078] Here, the first grid cluster includes a first grid sub-cluster 300b and a second grid cluster 300c. The first grid cluster 300b contains several arc-extinguishing grids, specifically nine, but more or fewer are possible. The first grid cluster 300b is located near the first exhaust channel M30.

[0079] The second grid sub-cluster 300c contains several arc-extinguishing grids, specifically eight, though more or fewer are possible. The second grid sub-cluster 300c is positioned close to the second grid sub-cluster 300a.

[0080] The arc-extinguishing grids in the first grid sub-cluster 300b are inclined at an angle to the first direction F1 and away from the direction where the second grid sub-cluster 300c is located. The arc-extinguishing grids in the second grid sub-cluster are inclined at an angle to the first direction F1 and towards the direction where the second grid sub-cluster 300a is located. The inclination degree of each arc-extinguishing grid in the first grid sub-cluster 300b is less than that of each arc-extinguishing grid in the second grid sub-cluster 300c. The inclination direction of each arc-extinguishing grid in the first grid sub-cluster 300b is opposite to that of each arc-extinguishing grid in the second grid sub-cluster 300c.

[0081] This divides the first grid cluster into a first grid sub-cluster 300b and a second grid cluster 300c, and the aforementioned inclined arrangement is also to better adapt to the flow of arc gas and facilitate the full utilization of the arc-extinguishing grid.

[0082] The circuit breaker schemes illustrated above can also be applied to disconnect switches.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A switch, which is a circuit breaker or a disconnecting switch, comprising a housing, at least one breaking space within the housing, and each breaking space having a first contact, a second contact, and an arc-extinguishing grid assembly, wherein the first contact and the second contact have a first separated state and a second contacted state; characterized in that: The breaking space includes an arc generation area for accommodating a first contact and a second contact; a grid sheet accommodating area for accommodating an arc extinguishing grid sheet group and located below the arc generation area in a first direction; a first exhaust passage and a second exhaust passage respectively arranged on both sides of the arc extinguishing grid sheet group in a second direction and both connecting the grid sheet accommodating area to the outside; The first exhaust passage is closer to the arc generation area than the second exhaust passage, and at least a part of the first exhaust passage is of a narrow-port structure; The caliber of the narrow-port structure is smaller than the caliber at any position of the second exhaust passage; The first direction is perpendicular to the second direction.

2. A switch according to claim 1, characterized in that: The narrow-port structure is only constructed by the housing; Or, the narrow-port structure is jointly constructed by the housing and a blocking member fixed on the housing.

3. A switch according to claim 1, characterized in that: The arc extinguishing grid sheet group includes an arc extinguishing grid sheet housing, and the arc extinguishing grid sheet group is fixed on the arc extinguishing grid sheet housing. The arc extinguishing grid sheet housing is provided with a first opening and a second opening. The first opening is a part of the first exhaust passage, and the second opening is a part of the second exhaust passage; the narrow-port structure is constructed by the housing, or the narrow-port structure is jointly constructed by the housing and the first opening, or the narrow-port structure is the first opening.

4. A switch according to claim 1, characterized in that: The narrow-port structure is a single-hole structure; The narrow-port structure is a multi-hole structure, the number of holes is N, 1 < N ≤ 5, and the caliber is the sum of the sizes of all holes.

5. A switch according to claim 1, characterized in that: The caliber of the narrow-port structure is R1, and the caliber of the smallest caliber part in the second exhaust passage is R2, 0.2R2 ≤ R1 ≤ 0.8R2.

6. A switch according to claim 1, characterized in that: The whole of the first exhaust passage is of a narrow-port structure, and the caliber at any part thereof is smaller than the caliber at any position of the second exhaust passage; Or, a part of the first exhaust passage is of a narrow-port structure, and the caliber at the narrow-port structure is smaller than the caliber at the other parts of the first exhaust passage.

7. A switch according to claim 1, characterized in that: At least one layer of filtering structure is provided in both the first exhaust passage and the second exhaust passage, and the number of filtering structures in the second exhaust passage is not more than the number of filtering structures in the first exhaust passage; Or / and, at least one layer of filtering structure is provided in both the first exhaust passage and the second exhaust passage, and the narrow-port structure in the first exhaust passage is closer to the arc extinguishing grid sheet group than the filtering structure.

8. A switch according to claim 1, characterized in that: The first exhaust passage includes a first exhaust port communicating with the outside, a first air inlet connected to the grid sheet accommodating area, and an intermediate area between the first exhaust port and the first air inlet. The narrow-port structure is arranged at the first exhaust port or the first air inlet or the intermediate area; And / or, the caliber of the second exhaust passage is different at least at two places.

9. A switch according to claim 1, characterized in that: The arc extinguishing grid sheet group includes a first grid sheet cluster and a second grid sheet cluster; in the second direction, the first exhaust passage and the second grid sheet cluster are located on both sides of the first grid sheet cluster, and the second exhaust passage is located on the side of the second grid sheet cluster far from the first grid sheet cluster; the grid sheet feet of some arc extinguishing grid sheets in the first grid sheet cluster extend to the arc generation area, or the total length of the second grid sheet cluster in the second direction is greater than the total length of the first grid sheet cluster in the second direction, or the number of arc extinguishing grid sheets in the second grid sheet cluster is greater than the number of arc extinguishing grid sheets in the first grid sheet cluster.

10. A switch according to claim 9, characterized in that: The arc extinguishing grid sheets in the second grid sheet cluster are arranged in sequence along a preset direction, the inclination angle of each arc extinguishing grid sheet with respect to the first direction is not greater than 20°, the inclination angles of each arc extinguishing grid sheet are different, and the inclination angle is larger the closer it is to the second exhaust passage; Alternatively, each arc-extinguishing grid in the second grid cluster is inclined and has an angle with the first direction, each arc-extinguishing grid in the first grid cluster is inclined and has an angle with the first direction, and the degree of inclination of each arc-extinguishing grid in the second grid cluster is greater than the degree of inclination of each arc-extinguishing grid in the first grid cluster. Alternatively, the first grid cluster includes a first grid sub-cluster and a second grid cluster. The first grid sub-cluster is located near the first exhaust channel, and the second grid cluster is located near the second grid cluster. The arc-extinguishing grids in the first grid sub-cluster and the arc-extinguishing grids in the second arc-extinguishing grid cluster are both inclined, and their inclination directions are opposite. The inclination degree of each arc-extinguishing grid in the first grid sub-cluster is less than the inclination degree of each arc-extinguishing grid in the second arc-extinguishing grid cluster.

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