Disconnecting device

Abstract

The application provides a kind of breaking device.The breaking device includes static and dynamic contact assembly, static contact assembly includes static arc contact and static main contact, dynamic contact assembly includes dynamic arc contact, dynamic main contact and air cylinder, dynamic arc contact is connected with air cylinder, dynamic contact assembly further includes the pull rod connected with dynamic arc contact;The breaking device further includes: piston, the inner cavity of air cylinder is formed with gas cavity around piston and pull rod;Nozzle assembly includes first and second nozzle parts, the first nozzle part is movably arranged on the static main contact and has a first nozzle, the second nozzle part is connected with the dynamic main contact and has a second nozzle;Nozzle assembly has the first state that the first and second nozzles are communicated and the second state that the first and second nozzles are disconnected;In the process that the breaking device moves from the closed position to the open position, the nozzle assembly moves from the first state to the second state.The application solves the problem that the breaking device in the prior art cannot extinguish the arc when in the open position.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical appliance switching technology, and more specifically, to a switching device. Background Technology

[0002] Currently, when the switching device is tripping, it uses compressed gas to blow away the arc, so that the gas is ejected through the nozzle of the moving contact to extinguish the arc.

[0003] However, the breaking capacity of existing breaking devices is limited, and there is a phenomenon that the arc cannot be extinguished when the circuit is in the open position, which affects the operational reliability of the breaking device. Summary of the Invention

[0004] The main objective of this invention is to provide a switching device to solve the problem that the switching device in the prior art cannot extinguish the electric arc when it is in the open position.

[0005] To achieve the above objectives, the present invention provides a switching device, comprising a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a stationary arc contact and a stationary main contact connected to each other. The moving contact assembly includes a moving arc contact, a moving main contact, and a cylinder. The moving contact assembly also includes a pull rod connected to the moving arc contact. The switching device further includes a piston, the inner cavity of which surrounds the piston and the pull rod to form a gas chamber. A nozzle assembly includes a first nozzle portion and a second nozzle portion. The first nozzle portion is movably disposed on the stationary main contact and has a first nozzle. The second nozzle portion is connected to the moving main contact and has a second nozzle, which communicates with the gas chamber. The nozzle assembly has a first state in which the first nozzle and the second nozzle are connected and a second state in which the first nozzle and the second nozzle are disconnected. During the process of the switching device moving from the closed position to the open position, the nozzle assembly moves from the first state to the second state.

[0006] Furthermore, when the nozzle assembly is in the second state, at least part of the first nozzle portion blocks the second nozzle.

[0007] Furthermore, the first nozzle portion and the second nozzle portion are movably connected, and the disconnecting device further includes a first mating assembly, which includes: a first mating portion disposed on the first nozzle portion; and a second mating portion disposed on the second nozzle portion. One of the first mating portion and the second mating portion is a first protrusion, and the other of the first mating portion and the second mating portion is a first recess. The first protrusion extends into the first recess and can slide along the extending direction of the first recess to connect the first nozzle portion and the second nozzle portion.

[0008] Furthermore, the first nozzle is a first through hole, which includes a first straight hole section and a variable diameter hole section that are interconnected. The first straight hole section is located close to the second nozzle, and the inner diameter of the first straight hole section is smaller than the inner diameter of the variable diameter hole section. Along the direction from the second nozzle to the first nozzle, the inner diameter of the variable diameter hole section gradually increases.

[0009] Furthermore, the second nozzle is a second through hole, which includes a second straight hole section and a third straight hole section that are interconnected. The second straight hole section is located close to the first nozzle, and the inner diameter of the second straight hole section is smaller than the inner diameter of the third straight hole section.

[0010] Furthermore, the switching device also includes a second mating assembly, which includes: a third mating portion disposed on the first nozzle portion; and a fourth mating portion disposed on the stationary main contact. One of the third and fourth mating portions is a second protrusion, and the other of the third and fourth mating portions is a second recess. The second protrusion extends into the second recess and can slide along the extending direction of the second recess to connect the first nozzle portion and the stationary main contact.

[0011] Further, the second recess includes: a straight section; an inclined section communicating with the straight section and located below the straight section; wherein, when the switching device is in the closed position, the second protrusion is located within the straight section; during the process of the switching device moving from the closed position to the open position, the second protrusion slides from the straight section into the inclined section; the inclined section is arc-shaped and its center is located below the straight section; and / or, the second recess is a groove.

[0012] Furthermore, the first mating component is one; or, the first mating component is multiple, and the multiple first mating components are spaced apart along a direction perpendicular to the extension direction of the first recess; and / or, the second mating component is one; or, the second mating component is multiple, and the multiple second mating components are spaced apart along the height direction of the stationary contact component.

[0013] Furthermore, the first mating part is a first recess, the opening of the first recess penetrates the surface of the first nozzle towards the second nozzle, and the second mating part is a first protrusion, the first protrusion is disposed on the surface of the second nozzle towards the first nozzle.

[0014] Furthermore, at least a portion of the fourth mating part is projected onto the stationary arc contact within the stationary arc contact.

[0015] According to the technical solution of this invention, the switching device includes a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a stationary arc contact and a stationary main contact connected to each other. The moving contact assembly includes a moving arc contact, a moving main contact, and a cylinder. The moving contact assembly also includes a pull rod connected to the moving arc contact. The switching device also includes a piston and a nozzle assembly, with the inner cavity of the cylinder surrounding the piston and the pull rod to form a gas chamber. The nozzle assembly includes a first nozzle portion and a second nozzle portion. The first nozzle portion is movably disposed on the stationary main contact and has a first nozzle. The second nozzle portion is connected to the moving main contact and has a second nozzle, which communicates with the gas chamber. The nozzle assembly has a first state where the first nozzle and the second nozzle are connected, and a second state where the first nozzle and the second nozzle are disconnected. Thus, during the movement of the switching device from the closed position to the open position, the lever moves to the right, causing the moving main contact and the stationary main contact to separate, and the moving arc contact and the stationary arc contact to separate, generating an electric arc. Because the gas in the gas chamber is compressed, the arc can be extinguished. When the switching device moves to the open position, the nozzle assembly moves from a first state to a second state, from a first state where the first and second nozzles are connected to a second state where the first and second nozzles are disconnected. When the nozzle assembly is in the second state, the disconnection of the first and second nozzles ensures that the arc path is cut off, solving the problem in the prior art where the switching device cannot extinguish the arc in the open position. This ensures that the arc is extinguished in the open position, thus improving the reliability of the switching device's opening operation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A cross-sectional view of an embodiment of the switching device according to the present invention in the closed position is shown;

[0018] Figure 2 It shows Figure 1 A bottom view of the stationary contact assembly of the switching device;

[0019] Figure 3 It shows Figure 1 A front view of the nozzle assembly of the interruption device in the first state;

[0020] Figure 4 It shows Figure 3 A bottom view of the first nozzle portion of the nozzle assembly in the middle;

[0021] Figure 5 It shows Figure 3 A bottom view of the second nozzle portion of the nozzle assembly;

[0022] Figure 6 It shows Figure 2 The main view of the static contact component;

[0023] Figure 7 It shows Figure 1 A cross-sectional view of the switching device in the circuit during the opening and closing process;

[0024] Figure 8 It shows Figure 7 A bottom view of the stationary contact assembly of the switching device;

[0025] Figure 9 It shows Figure 1 A cross-sectional view of the switching device in the open position;

[0026] Figure 10 It shows Figure 9 A bottom view of the stationary contact assembly of the switching device.

[0027] The above figures include the following reference numerals:

[0028] 10. Stationary contact assembly; 11. Stationary arc contact; 12. Stationary main contact; 13. Support;

[0029] 20. Moving contact assembly; 21. Moving arc contact; 22. Moving main contact; 23. Cylinder; 231. Air chamber; 24. Pull rod;

[0030] 30. Piston;

[0031] 41. First nozzle section; 411. First nozzle; 4111. First straight hole section; 4112. Variable diameter hole section; 42. Second nozzle section; 421. Second nozzle; 4211. Second straight hole section; 4212. Third straight hole section;

[0032] 51. First coordinating part; 52. Second coordinating part;

[0033] 61. Third mating section; 62. Fourth mating section; 621. Straight section; 622. Inclined section;

[0034] 70. Supporting structure. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0037] In this invention, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0038] To address the problem that existing disconnection devices cannot extinguish the electric arc when in the open position, this application provides a disconnection device.

[0039] like Figures 1 to 10 As shown, the switching device includes a stationary contact assembly 10 and a moving contact assembly 20. The stationary contact assembly 10 includes a stationary arc contact 11 and a stationary main contact 12 connected to each other. The moving contact assembly 20 includes a moving arc contact 21, a moving main contact 22, and a cylinder 23. The moving contact assembly 20 also includes a pull rod 24 connected to the moving arc contact 21. The switching device also includes a piston 30 and a nozzle assembly. The inner cavity of the cylinder 23, the piston 30, and the pull rod 24 surround to form a gas chamber 231. The nozzle assembly includes a first nozzle portion 41 and a second nozzle portion 42. The first nozzle portion 41 is movably disposed on the stationary main contact 12 and has a first nozzle 411. The second nozzle portion 42 is connected to the moving main contact 22 and has a second nozzle 421, which communicates with the gas chamber 231. The nozzle assembly has a first state in which the first nozzle 411 and the second nozzle 421 are connected, and a second state in which the first nozzle 411 and the second nozzle 421 are disconnected; during the process of the switching device moving from the closed position to the open position, the nozzle assembly moves from the first state to the second state.

[0040] Applying the technical solution of this embodiment, during the process of the switching device moving from the closed position to the open position, the pull rod 24 moves to the right, causing the moving main contact 22 and the stationary main contact 12 to separate, and the moving arc contact 21 and the stationary arc contact 11 to separate and generate an electric arc. Since the gas in the air chamber 231 is compressed, the electric arc can be blown away. When the switching device moves to the open position, the nozzle assembly moves from the first state to the second state, so that the nozzle assembly moves from the first state where the first nozzle 411 and the second nozzle 421 are connected to the second state where the first nozzle 411 and the second nozzle 421 are disconnected. When the nozzle assembly is in the second state, since the first nozzle 411 and the second nozzle 421 are disconnected, the electric arc path is cut off, which solves the problem in the prior art that the switching device cannot extinguish the electric arc when it is in the open position, and ensures that the electric arc is extinguished when the switching device is in the open position, thereby improving the opening reliability of the switching device.

[0041] like Figure 1As shown, the stationary contact assembly 10 also includes a support 13, on which the stationary arc contact 11 and the stationary main contact 12 are both disposed.

[0042] In this embodiment, the moving arc contact 21 is located inside and connected to the cylinder 23. At least a portion of the piston 30 extends into and is slidably connected to the cylinder 23. The pull rod 24 passes through the cylinder 23 and the piston 30 to drive the moving contact assembly 20 and the cylinder 23 to move in accordance with the piston 30 via the moving arc contact 21.

[0043] like Figure 1 As shown, the switching device also includes a support structure 70, and the second nozzle portion 42 is mounted on the moving main contact 22 via the support structure 70.

[0044] In this embodiment, when the nozzle assembly is in the second state, at least a portion of the first nozzle portion 41 blocks the second nozzle 421. Thus, when the switching device is in the open position, with the nozzle assembly in the second state, this arrangement ensures that the first nozzle 411 and the second nozzle 421 are staggered and not connected, thereby cutting off the arc path and ensuring the arc is fully extinguished, further improving the opening reliability of the switching device. Simultaneously, this arrangement makes disconnecting the first nozzle 411 and the second nozzle 421 easier and simpler, reducing the operational difficulty for workers.

[0045] like Figures 1 to 5 As shown, the first nozzle portion 41 and the second nozzle portion 42 are movably connected. The switching device also includes a first mating assembly, which includes a first mating part 51 and a second mating part 52. The first mating part 51 is disposed on the first nozzle portion 41. The second mating part 52 is disposed on the second nozzle portion 42. One of the first mating parts 51 and the second mating part 52 is a first protrusion, and the other is a first recess. The first protrusion extends into the first recess and can slide along the extending direction of the first recess to connect the first nozzle portion 41 and the second nozzle portion 42. This arrangement achieves a sliding fit between the first nozzle portion 41 and the second nozzle portion 42, ensuring that the first nozzle 411 and the second nozzle 421 can be connected or disconnected, thereby improving the reliability of the switching device's opening and closing. Furthermore, it reduces the overall disassembly difficulty of the nozzle assembly, thus reducing the labor intensity of the workers. Simultaneously, this arrangement allows for more flexible structural selection of the first mating part 51 and the second mating part 52 to meet different usage requirements and working conditions, and also improves the processing flexibility of the workers.

[0046] In this embodiment, the first mating part 51 is a first recess, and the second mating part 52 is a first protrusion. The first protrusion extends into the first recess and can slide along the extending direction of the first recess to connect the first nozzle part 41 and the second nozzle part 42.

[0047] In other embodiments not shown in the accompanying drawings, the first mating part is a first protrusion, and the second mating part is a first recess. The first protrusion extends into the first recess and can slide along the extending direction of the first recess to connect the first nozzle part and the second nozzle part.

[0048] like Figure 4 As shown, the first nozzle 411 is a first through hole, which includes a first straight hole section 4111 and a variable diameter hole section 4112 that are interconnected. The first straight hole section 4111 is located close to the second nozzle 421, and the inner diameter of the first straight hole section 4111 is smaller than the inner diameter of the variable diameter hole section 4112. Along the direction from the second nozzle 421 to the first nozzle 411, the inner diameter of the variable diameter hole section 4112 gradually increases. Thus, when the switching device is in the closed position, the stationary arc contact 11 extends into the first nozzle 411 and the second nozzle 421. During the opening process of the switching device, the pull rod 24 drives the moving contact assembly 20 to move to the right relative to the stationary contact assembly 10, so that the stationary arc contact 11 exits sequentially from the second nozzle 421, the first straight hole section 4111, and the variable diameter hole section 4112. The aforementioned arrangement of the variable diameter hole section 4112 avoids motion interference between its inner wall and the stationary arc contact 11, which would affect the opening of the switching device, further improving the opening reliability of the switching device. At the same time, the above arrangement makes the structure of the first nozzle 411 simpler, easier to process and implement, and reduces the processing cost and difficulty of the first nozzle 411.

[0049] like Figure 5 As shown, the second nozzle 421 is a second through hole, which includes a second straight hole section 4211 and a third straight hole section 4212 that are interconnected. The second straight hole section 4211 is located close to the first nozzle 411, and the inner diameter of the second straight hole section 4211 is smaller than the inner diameter of the third straight hole section 4212. This arrangement of the second straight hole section 4211 not only facilitates the accommodation of the moving arc contact 21 but also ensures that the gas in the gas chamber 231 can enter the first nozzle 411 through the third straight hole section 4212 and the second straight hole section 4211 to extinguish the electric arc. Simultaneously, this arrangement simplifies the structure of the second nozzle 421, making it easier to manufacture and implement, thus reducing the manufacturing cost and difficulty of the second nozzle 421.

[0050] In this embodiment, the connection between the second straight hole section 4211 and the third straight hole section 4212 is transitioned by an arc-shaped surface.

[0051] like Figure 2 , Figure 3 , Figure 6 , Figure 8 and Figure 10As shown, the switching device also includes a second mating assembly, which comprises a third mating portion 61 and a fourth mating portion 62. The third mating portion 61 is disposed on the first nozzle portion 41. The fourth mating portion 62 is disposed on the stationary main contact 12. One of the third mating portions 61 and the fourth mating portion 62 is a second protrusion, and the other is a second recess. The second protrusion extends into the second recess and can slide along the extension direction of the second recess to connect the first nozzle portion 41 and the stationary main contact 12. This arrangement achieves a sliding fit between the first nozzle portion 41 and the stationary main contact 12, ensuring that the first nozzle portion 41 can move relative to the stationary main contact 12 to adjust the on / off state of the first nozzle 411 and the second nozzle 421, further improving the opening and closing reliability of the switching device. Simultaneously, this arrangement allows for more flexible structural selection of the third mating portion 61 and the fourth mating portion 62 to meet different usage requirements and operating conditions, and also improves the processing flexibility of the operator.

[0052] In this embodiment, the third mating part 61 is a second protrusion, and the fourth mating part 62 is a second recess. The second protrusion extends into the second recess and can slide along the extending direction of the second recess to connect the first nozzle part 41 and the stationary main contact 12.

[0053] In other embodiments not shown in the accompanying drawings, the third mating part is a second recess, and the fourth mating part is a second protrusion. The second protrusion extends into the second recess and can slide along the extending direction of the second recess to connect the first nozzle part and the stationary main contact.

[0054] like Figure 2 , Figure 8 and Figure 10 As shown, the second recess includes a straight section 621 and an inclined section 622. The inclined section 622 communicates with the straight section 621 and is located below the straight section 621. When the switching device is in the closed position, the second protrusion is located within the straight section 621; during the movement of the switching device from the closed position to the open position, the second protrusion slides from the straight section 621 into the inclined section 622. This arrangement of the straight section 621 not only ensures that the first nozzle 411 can communicate with the second nozzle 421, but also allows the first nozzle portion 41 to move relative to the stationary main contact during the movement of the moving contact assembly 20 relative to the stationary contact assembly 10. Simultaneously, the arrangement of the inclined section 622 ensures that the first nozzle 411 can disconnect from the second nozzle 421, thereby ensuring that the arc is extinguished at the open position of the switching device, thus improving the opening reliability of the switching device.

[0055] Optionally, there may be one first mating component; or, there may be multiple first mating components, spaced apart along a direction perpendicular to the extension direction of the first recess; and / or, there may be one second mating component; or, there may be multiple second mating components, spaced apart along the height direction of the stationary contact assembly 10. This arrangement allows for greater flexibility in selecting the number of first and / or second mating components to meet different usage requirements and working conditions, and also improves the processing flexibility for operators.

[0056] In this embodiment, there are two first mating components, which are spaced apart along a direction perpendicular to the extending direction of the first recess. This arrangement increases the contact area between the first nozzle portion 41 and the second nozzle portion 42, thereby improving their mating stability and preventing them from detaching and affecting the overall structural stability of the nozzle assembly.

[0057] It should be noted that the number of the first mating components is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, the first mating components may be three, four, five, or more.

[0058] In this embodiment, there are two second mating components, which are spaced apart along the height direction of the stationary contact assembly 10. This arrangement increases the contact area between the first nozzle portion 41 and the stationary main contact 12, thereby improving the mating stability between the two and preventing them from detaching and affecting the overall structural stability of the nozzle assembly.

[0059] Optionally, the inclined section 622 is arc-shaped with its center located below the straight section 621; and / or, the second recess is a groove. Thus, during the sliding process of the third mating part 61 relative to the fourth mating part 62, the above-mentioned arrangement reduces the friction between them, not only improving the opening reliability of the switching device but also reducing structural wear on the first nozzle part 41 and the stationary main contact 12. Simultaneously, the above-mentioned arrangement simplifies the structure of the second recess, making it easier to process and implement, thus reducing the processing cost and difficulty of the second recess.

[0060] In this embodiment, the inclined segment 622 is arc-shaped with its center located below the straight segment 621, and the second recess is a groove.

[0061] Specifically, the working principle of the switching device is as follows:

[0062] like Figure 1 and Figure 2 As shown, when the switching device is in the closed position, the moving arc contact 21 and the stationary arc contact 11 are connected, the moving main contact 22 and the stationary main contact 12 are connected, and the second protrusion is in the straight section 621. At this time, the first nozzle 411 and the second nozzle 421 are arranged opposite to each other and connected.

[0063] like Figure 7 As shown, during the opening process of the switching device, the pull rod 24 moves to the right, the moving main contact 22 and the stationary main contact 12 separate, the moving arc contact 21 and the stationary arc contact 11 separate, and an electric arc is generated between the moving arc contact 21 and the stationary arc contact 11. The gas in the gas chamber 231 is compressed and blows the arc. Figure 8 As shown, at this time, the second protrusion slides to the middle of the second concave portion.

[0064] like Figure 9 and Figure 10 As shown, when the switching device is in the open position, the pull rod 24 continues to move to the right, the second protrusion moves into the inclined section 622 and is limited by the arc. The second protrusion and the first nozzle 41 move downward to achieve the misalignment of the first nozzle 411 and the second nozzle 421. The first nozzle 411 and the second nozzle 421 block each other, the arc path is cut off, which is conducive to the extinction of the arc.

[0065] like Figure 4 and Figure 5 As shown, the first mating part 51 is a first recess, the opening of which penetrates the surface of the first nozzle part 41 facing the second nozzle part 42. The second mating part 52 is a first protrusion, which is disposed on the surface of the second nozzle part 42 facing the first nozzle part 41. In this way, the above-mentioned arrangement of the first recess facilitates the insertion of the first protrusion into the first recess, thereby reducing the assembly difficulty of the two parts.

[0066] like Figure 6 As shown, at least a portion of the fourth mating part 62 has its orthographic projection onto the stationary arc contact 11 within the stationary arc contact 11. This arrangement further ensures that the arc is extinguished when the switching device is in the open position, thereby improving the opening reliability of the switching device.

[0067] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0068] The switching device includes a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a stationary arc contact and a stationary main contact connected to each other. The moving contact assembly includes a moving arc contact, a moving main contact, and a cylinder. The moving arc contact is located inside and connected to the cylinder. The moving contact assembly also includes a pull rod connected to the moving arc contact. The switching device also includes a piston and a nozzle assembly. At least a portion of the piston extends into and is slidably connected to the cylinder. The pull rod passes through the cylinder and the piston to drive the moving contact assembly and the cylinder to move in a manner equivalent to a piston movement via the moving arc contact. The inner cavity of the cylinder, the piston, and the pull rod form a gas chamber. The nozzle assembly includes a first nozzle portion and a second nozzle portion. The first nozzle portion is movably disposed on the stationary main contact and has a first nozzle. The second nozzle portion is connected to the moving main contact and has a second nozzle, which communicates with the gas chamber. The nozzle assembly has a first state in which the first nozzle and the second nozzle are connected, and a second state in which the first nozzle and the second nozzle are disconnected. Thus, during the movement of the switching device from the closed position to the open position, the lever moves to the right, causing the moving main contact and the stationary main contact to separate, and the moving arc contact and the stationary arc contact to separate, generating an electric arc. Because the gas in the gas chamber is compressed, the arc can be extinguished. When the switching device moves to the open position, the nozzle assembly moves from a first state to a second state, from a first state where the first and second nozzles are connected to a second state where the first and second nozzles are disconnected. When the nozzle assembly is in the second state, the disconnection of the first and second nozzles ensures that the arc path is cut off, solving the problem in the prior art where the switching device cannot extinguish the arc in the open position. This ensures that the arc is extinguished in the open position, thus improving the reliability of the switching device's opening operation.

[0069] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0070] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0071] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switching device, comprising a stationary contact assembly (10) and a moving contact assembly (20), wherein the stationary contact assembly (10) includes a stationary arc contact (11) and a stationary main contact (12) connected to each other, and the moving contact assembly (20) includes a moving arc contact (21), a moving main contact (22), and a cylinder (23), characterized in that, The moving contact assembly (20) further includes a pull rod (24), which is connected to the moving arc contact (21); the breaking device further includes: The piston (30) and the inner cavity of the cylinder (23) surround the piston (30) and the pull rod (24) to form a gas chamber (231); The nozzle assembly includes a first nozzle portion (41) and a second nozzle portion (42). The first nozzle portion (41) is movably disposed on the stationary main contact (12) and has a first nozzle (411). The second nozzle portion (42) is connected to the moving main contact (22) and has a second nozzle (421). The second nozzle (421) communicates with the air chamber (231). The nozzle assembly has a first state in which the first nozzle (411) and the second nozzle (421) are connected and a second state in which the first nozzle (411) and the second nozzle (421) are disconnected; during the process of the switching device moving from the closed position to the open position, the nozzle assembly moves from the first state to the second state.

2. The switching device according to claim 1, characterized in that, When the nozzle assembly is in the second state, at least part of the first nozzle portion (41) blocks the second nozzle (421).

3. The switching device according to claim 1, characterized in that, The first nozzle portion (41) and the second nozzle portion (42) are movably connected, and the switching device further includes a first mating assembly, which includes: The first mating part (51) is disposed on the first nozzle part (41); The second mating part (52) is disposed on the second nozzle part (42). One of the first mating part (51) and the second mating part (52) is a first protrusion, and the other of the first mating part (51) and the second mating part (52) is a first recess. The first protrusion extends into the first recess and can slide along the extension direction of the first recess to connect the first nozzle part (41) and the second nozzle part (42).

4. The switching device according to claim 1, characterized in that, The first nozzle (411) is a first through hole, which includes a first straight hole section (4111) and a variable diameter hole section (4112) that are interconnected. The first straight hole section (4111) is located close to the second nozzle (421), and the inner diameter of the first straight hole section (4111) is smaller than the inner diameter of the variable diameter hole section (4112). Along the direction from the second nozzle (421) to the first nozzle (411), the inner diameter of the variable diameter hole section (4112) gradually increases.

5. The switching device according to claim 1, characterized in that, The second nozzle (421) is a second through hole, which includes a second straight hole section (4211) and a third straight hole section (4212) that are connected to each other. The second straight hole section (4211) is located close to the first nozzle (411), and the inner diameter of the second straight hole section (4211) is smaller than the inner diameter of the third straight hole section (4212).

6. The switching device according to claim 3, characterized in that, The interrupting device further includes a second mating component, the second mating component comprising: The third mating part (61) is disposed on the first nozzle part (41); A fourth mating part (62) is provided on the stationary main contact (12). One of the third mating parts (61) and the fourth mating part (62) is a second protrusion, and the other of the third mating parts (61) and the fourth mating part (62) is a second recess. The second protrusion extends into the second recess and can slide along the extension direction of the second recess to connect the first nozzle part (41) and the stationary main contact (12).

7. The switching device according to claim 6, characterized in that, The second recess includes: Straight section (621); The inclined segment (622) communicates with the straight segment (621) and is located below the straight segment (621); When the switching device is in the closed position, the second protrusion is located in the straight section (621); during the process of the switching device moving from the closed position to the open position, the second protrusion slides from the straight section (621) to the inclined section (622). The inclined section (622) is arc-shaped and its center is located below the straight section (621); and / or, the second recess is a groove.

8. The switching device according to claim 6, characterized in that, The first mating component is one; or, the first mating component is multiple, and the multiple first mating components are spaced apart along a direction perpendicular to the extension direction of the first recess; and / or, the second mating component is one; or, the second mating component is multiple, and the multiple second mating components are spaced apart along the height direction of the stationary contact component (10).

9. The switching device according to claim 3, characterized in that, The first mating part (51) is a first recess, the opening of the first recess penetrates the surface of the first nozzle part (41) facing the second nozzle part (42), and the second mating part (52) is a first protrusion, the first protrusion is disposed on the surface of the second nozzle part (42) facing the first nozzle part (41).

10. The switching device according to claim 6, characterized in that, At least part of the fourth mating part (62) is projected onto the stationary arc contact (11) within the stationary arc contact (11).

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