Disconnecting device

Abstract

This invention provides a switching device. The switching device includes: a stationary contact and a moving contact assembly. The stationary contact assembly includes a first stationary arc contact, and the moving contact assembly includes a first moving arc contact and a cylinder. The moving contact assembly also includes a pull rod and a second moving arc contact. The pull rod passes through the cylinder to drive the moving contact assembly toward or away from the stationary contact assembly. The second moving arc contact is disposed on the pull rod. The switching device further includes: a piston assembly, including a piston structure and a second stationary arc contact located within the cylinder. The piston structure divides the inner cavity of the cylinder into a first and a second air chamber. The first moving arc contact and a portion of the second stationary arc contact are located in the first air chamber, and the second moving arc contact and another portion of the second stationary arc contact are located in the second air chamber. The moving contact assembly has a nozzle communicating with the first air chamber. This invention solves the problem in the prior art where the opening rate of the switching device is relatively low, affecting its switching capacity.

Description

Technical Field

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

[0002] Currently, when the switchgear is tripped, it uses compressed gas to extinguish the arc, so that the gas is ejected through the nozzle of the moving contact to perform the arc extinguishing operation.

[0003] However, when interrupting large currents, the existing switching devices suffer from high arc energy and significant blockage effect, as well as high cylinder pressure, which reduces the opening speed of the switching device and affects its breaking capacity and opening response efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a switching device to solve the problem that the low opening rate of the switching device in the prior art affects its switching capacity and response efficiency.

[0005] To achieve the above objectives, the present invention provides an interrupting device, comprising a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a first stationary arc contact, and the moving contact assembly includes a first moving arc contact and a cylinder body. The first moving arc contact is located within and connected to the cylinder body. The moving contact assembly further includes a pull rod and a second moving arc contact. A first end of the pull rod passes through the cylinder body to drive the moving contact assembly toward or away from the stationary contact assembly. The second moving arc contact is disposed on the first end of the pull rod. The interrupting device further includes a piston assembly, comprising a piston structure and a second stationary arc contact located within the cylinder body. The second stationary arc contact passes through the piston structure. The cylinder body is movably disposed relative to the piston structure. The piston structure divides the inner cavity of the cylinder body into a first gas chamber and a second gas chamber. The first moving arc contact and a portion of the second stationary arc contact are located in the first gas chamber, and the second moving arc contact and another portion of the second stationary arc contact are located in the second gas chamber. The moving contact assembly has a nozzle communicating with the first gas chamber, and gas ejected from the nozzle is used for arc extinguishing.

[0006] Furthermore, the piston assembly also includes: a fixing part connected to the outer cover of the switching device, the fixing part having a first guide through hole, a pull rod passing through the first guide through hole, the extension direction of the first guide through hole being consistent with the extension direction of the pull rod; and a connecting rod, the two ends of which are respectively connected to the piston structure and the fixing part.

[0007] Further, the cylinder body includes: a cylindrical body, with a first moving arc contact disposed at one end of the cylindrical body; a sealing plate disposed at the other end of the cylindrical body, and a pull rod passing through and fixedly connected to the sealing plate; wherein the sealing plate has a second guide through hole, and a connecting rod passes through the second guide through hole; the piston assembly further includes: a first sealing structure disposed between the hole wall of the second guide through hole and the connecting rod; the extension direction of the second guide through hole is consistent with the extension direction of the connecting rod; and / or, the connecting rod is made of insulating material; and / or, there is one connecting rod; or, there are multiple connecting rods, with multiple connecting rods circumferentially spaced around the pull rod.

[0008] Furthermore, the first moving arc contact has a third guide through hole, the third guide through hole comprising: a first hole section for passing through the first stationary arc contact; a second hole section communicating with the first hole section for passing through the second stationary arc contact; wherein, when the switching device is in the closed state, at least a portion of the second stationary arc contact extends into the second hole section.

[0009] Furthermore, the diameter of the second hole section is larger than that of the first hole section.

[0010] Furthermore, the piston structure has a mounting hole, the second stationary arc contact passes through the mounting hole and is fixedly connected to the mounting hole, the first end of the second stationary arc contact extends into the second air chamber to cooperate with the second moving arc contact; the second end of the second stationary arc contact can extend into the first moving arc contact to move relative to the first moving arc contact.

[0011] Furthermore, a friction-reducing structure is provided between the first static arc contact and the first hole section.

[0012] Furthermore, the central axis of the second moving arc contact is coaxial with the central axis of the first moving arc contact; and / or, the central axis of the second stationary arc contact is coaxial with the central axis of the first stationary arc contact.

[0013] Furthermore, the second moving arc contact is fixedly connected to the first end of the pull rod and located inside the second air chamber.

[0014] Furthermore, the second static arc contact is a rod of equal diameter.

[0015] According to the technical solution of this invention, the interrupting device includes a stationary contact assembly, a moving contact assembly, and a piston assembly. The stationary contact assembly includes a first stationary arc contact, and the moving contact assembly includes a first moving arc contact and a cylinder body. The first moving arc contact is located within and connected to the cylinder body. The moving contact assembly also includes a pull rod and a second moving arc contact. The first end of the pull rod passes through the cylinder body to drive the moving contact assembly toward or away from the stationary contact assembly. The second moving arc contact is disposed on the first end of the pull rod. The piston assembly includes a piston structure and a second stationary arc contact located within the cylinder body. The second stationary arc contact passes through the piston structure. The cylinder body is movably disposed relative to the piston structure. The piston structure divides the inner cavity of the cylinder body into a first gas chamber and a second gas chamber. The first moving arc contact and a portion of the second stationary arc contact are located in the first gas chamber, and the second moving arc contact and another portion of the second stationary arc contact are located in the second gas chamber. The moving contact assembly has a nozzle communicating with the first gas chamber, and the gas ejected from the nozzle is used for arc extinguishing. In this way, during the opening process, the operator pulls the lever, causing the moving contact assembly to move away from the stationary contact assembly. The second stationary arc contact extends into the first moving arc contact, generating an electric arc between the first stationary and moving arc contacts, and between the second stationary and moving arc contacts. The arc between the first stationary and moving arc contacts creates a blocking effect, increasing the gas pressure in the first air chamber and improving the arc's extinguishing ability. In the second air chamber, the arc generated between the second stationary and moving arc contacts heats the gas, increasing the air pressure. Under this pressure, the cylinder moves away from the stationary contact assembly, thereby increasing the opening speed of the switching device. This solves the problem of the low opening speed of existing switching devices affecting their breaking capacity and response efficiency, thus improving the breaking capacity of the switching device. 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 state is shown;

[0018] Figure 2 It shows Figure 1 A cross-sectional view of the circuit breaker during the tripping process;

[0019] Figure 3 It shows Figure 1 A cross-sectional view of the circuit breaker when it is in the open state.

[0020] The above figures include the following reference numerals:

[0021] 10. Stationary contact assembly; 11. First stationary arc contact;

[0022] 20. Moving contact assembly; 21. First moving arc contact; 211. Third guide through hole; 2111. First hole section; 2112. Second hole section; 22. Cylinder body; 221. First air chamber; 222. Second air chamber; 223. Cylindrical body; 224. Sealing plate; 2241. Second guide through hole; 23. Pull rod; 24. Second moving arc contact;

[0023] 30. Piston assembly; 31. Piston structure; 32. Second static arc contact; 33. Fixing part; 331. First guide through hole; 34. Connecting rod;

[0024] 40. Nozzle;

[0025] 51. First electric arc; 52. Second electric arc. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In order to solve the problem that the low opening rate of the switching device in the prior art affects its switching capacity and response efficiency, this application provides a switching device.

[0030] like Figures 1 to 3As shown, the switching device includes a stationary contact assembly 10 and a moving contact assembly 20. The stationary contact assembly 10 includes a first stationary arc contact 11, and the moving contact assembly 20 includes a first moving arc contact 21 and a cylinder 22. The first moving arc contact 21 is located inside and connected to the cylinder 22. The moving contact assembly 20 also includes a pull rod 23 and a second moving arc contact 24. The first end of the pull rod 23 passes through the cylinder 22 to drive the moving contact assembly 20 toward or away from the stationary contact assembly 10. The second moving arc contact 24 is disposed on the first end of the pull rod 23. The interrupting device also includes a piston assembly 30, which includes a piston structure 31 and a second stationary arc contact 32 located within a cylinder 22. The second stationary arc contact 32 passes through the piston structure 31. The cylinder 22 is movably disposed relative to the piston structure 31. The piston structure 31 divides the inner cavity of the cylinder 22 into a first gas chamber 221 and a second gas chamber 222. The first moving arc contact 21 and a portion of the second stationary arc contact 32 are located in the first gas chamber 221, and the second moving arc contact 24 and another portion of the second stationary arc contact 32 are located in the second gas chamber 222. The moving contact assembly 20 has a nozzle 40 communicating with the first gas chamber 221, and the gas ejected from the nozzle 40 is used for arc extinguishing.

[0031] Applying the technical solution of this embodiment, during the opening process, the operator pulls the lever 23 to move the moving contact assembly 20 toward the side away from the stationary contact assembly 10. The second stationary arc contact 32 extends into the first moving arc contact 21, so that an electric arc is generated between the first stationary arc contact 11 and the first moving arc contact 21, and between the second stationary arc contact 32 and the second moving arc contact 24. Due to the blockage effect of the electric arc between the first stationary arc contact 11 and the first moving arc contact 21, the gas pressure in the first air chamber 221 increases, thereby improving the arc extinguishing ability. Within the second gas chamber 222, the electric arc generated between the second stationary arc contact 32 and the second moving arc contact 24 can heat the gas within the second gas chamber 222, thereby increasing the gas pressure within the second gas chamber 222. Under the action of the aforementioned gas pressure, the cylinder 22 can be pushed to move toward the side away from the stationary contact assembly 10, thereby increasing the opening speed of the switching device. This solves the problem in the prior art where the opening speed of the switching device is relatively small, affecting its switching capacity and response efficiency, and improves the switching capacity of the switching device.

[0032] In this embodiment, when the pull rod 23 is pulled to move the moving contact assembly 20 toward the side away from the stationary contact assembly 10, the second stationary arc contact 32 extends into the first moving arc contact 21, so that an electric arc is generated between the first stationary arc contact 11 and the first moving arc contact 21, and between the second stationary arc contact 32 and the second moving arc contact 24. The gas pressure in the second air chamber 222 increases and pushes the cylinder 22 toward the side away from the stationary contact assembly 10.

[0033] like Figures 1 to 3As shown, the cylinder body 22 includes a cylindrical body 223 and a sealing plate 224. A first moving arc contact 21 is located at one end of the cylindrical body 223, and the sealing plate 224 is located at the other end of the cylindrical body 223. A pull rod 23 passes through the sealing plate 224 and is fixedly connected to it. Thus, when the air pressure in the second air chamber 222 increases, this air pressure acts on the sealing plate 224, pushing the sealing plate 224 and the cylinder body 22 towards the side away from the stationary contact assembly 10, thereby increasing the opening speed of the switching device and ultimately improving its switching capacity. Simultaneously, this configuration simplifies the structure of the cylinder body 22, making it easier to manufacture and implement, thus reducing the manufacturing cost and difficulty of the cylinder body 22.

[0034] Optionally, the cylindrical body 223 and the sealing plate 224 are integrally formed structures.

[0035] In this embodiment, the sealing plate 224 and the pull rod 23 are arranged perpendicularly to each other, so that the force exerted by the gas in the second air chamber 222 on the sealing plate 224 is perpendicular to the sealing plate 224, further increasing the moving speed of the sealing plate 224. The cylinder 22 and the pull rod 23 are fixedly connected and move synchronously.

[0036] like Figures 1 to 3 As shown, the piston assembly 30 also includes a fixing part 33 and a connecting rod 34. The fixing part 33 is connected to the outer cover of the switching device and has a first guide hole 331. The pull rod 23 passes through the first guide hole 331, and the extension direction of the first guide hole 331 is consistent with the extension direction of the pull rod 23. The connecting rod 34 passes through the sealing plate 224, and its two ends are connected to the piston structure 31 and the fixing part 33, respectively. Thus, the fixing part 33 is fixedly connected to the outer cover and remains stationary, while the pull rod 23 passes through the fixing part 33 and can slide along the first guide hole 331. The fixed connection between the fixing part 33 and the connecting rod 34 ensures that the piston assembly 30 remains stationary, thereby allowing for pressure changes within the second air chamber 222 to adjust the opening speed. Simultaneously, this configuration improves the overall structural stability of the piston assembly 30, thereby extending the service life of the switching device.

[0037] In this embodiment, the piston assembly 30 remains stationary. When the operator pulls the lever 23, the lever 23 drives the cylinder 22 to move synchronously and slide relative to the piston assembly 30, thereby adjusting the spatial dimensions of the first air chamber 221 and the second air chamber 222. Simultaneously, the first guide hole 331 guides the lever 23 to improve the smoothness of its movement and operational reliability.

[0038] Optionally, the sealing plate 224 has a second guide through hole 2241, and the connecting rod 34 passes through the second guide through hole 2241. The piston assembly 30 also includes a first sealing structure. The first sealing structure is disposed between the wall of the second guide through hole 2241 and the connecting rod 34, and the extension direction of the second guide through hole 2241 is consistent with the extension direction of the connecting rod 34. In this way, the second guide through hole 2241 can guide the connecting rod 34, thereby improving the smoothness of the cylinder body 22's movement and operational reliability. Simultaneously, the aforementioned arrangement of the first sealing structure improves the airtightness of the second air chamber 222, preventing gas leakage within the second air chamber 222 from affecting its pressure increase, further increasing the opening speed of the switching device and improving the switching capacity of the switching device.

[0039] Optionally, the first sealing structure is made of rubber or silicone.

[0040] Optionally, the piston assembly 30 further includes a second sealing structure. This second sealing structure is disposed between the piston structure 31 and the inner wall of the cylinder 22. This second sealing structure improves the airtightness of the second air chamber 222, preventing gas leakage from occurring within the second air chamber 222 and thus avoiding an increase in its pressure. This further increases the opening speed of the switching device and enhances its switching capacity.

[0041] Optionally, the second sealing structure is made of rubber or silicone.

[0042] Optionally, the second sealing structure is fitted onto the piston structure 31.

[0043] In this embodiment, the piston structure 31 is plate-shaped.

[0044] Optionally, the connecting rod 34 is made of insulating material; and / or, there is one connecting rod 34; or, there are multiple connecting rods 34, which are spaced apart circumferentially around the pull rod 23. This arrangement prevents the connecting rod 34 from conducting electricity and causing a short circuit inside the switching device, thereby improving the operational reliability of the switching device. At the same time, this arrangement allows for greater flexibility in selecting the number of connecting rods 34 to meet different usage requirements and operating conditions, and also improves the processing flexibility for operators.

[0045] In this embodiment, there are two connecting rods 34, which are spaced apart circumferentially around the pull rod 23 and are parallel to each other. This arrangement improves the connection stability between the piston structure 31 and the fixing part 33, thereby extending the overall service life of the piston assembly 30.

[0046] It should be noted that the number of connecting rods 34 is not limited to this and can be adjusted according to working conditions and usage requirements. Optionally, there may be three, four, five, six, or more connecting rods 34.

[0047] Optionally, the switching device also includes a drive device. The drive device is connected to the pull rod 23 to drive the pull rod 23 to reciprocate along its extension direction, thereby realizing the opening and closing actions of the switching device. This configuration enhances the intelligence of the switching device. When opening is required, the drive device is activated, which in turn drives the pull rod 23 to move away from the stationary contact assembly 10, thus reducing the difficulty of operation for the operator.

[0048] like Figures 1 to 3 As shown, the first moving arc contact 21 has a third guide through hole 211, which includes a first section 2111 and a second section 2112. The first section 2111 is used to pass through the first stationary arc contact 11, and the second section 2112 communicates with the first section 2111 to pass through the second stationary arc contact 32. When the switching device is in the closed state, at least a portion of the second stationary arc contact 32 extends into the second section 2112. Thus, during the movement of the first moving arc contact 21, the aforementioned arrangement of the third guide through hole 211 can limit the sliding direction of the first moving arc contact 21, ensuring that the first stationary arc contact 11 can extend into the first section 2111 and the second stationary arc contact 32 can extend into the second section 2112, thereby improving the smoothness of the movement of the first moving arc contact 21.

[0049] In this embodiment, the diameter of the second hole segment 2112 is larger than the diameter of the first hole segment 2111. Thus, after the first stationary arc contact 11 extends into the second hole segment 2112 through the first hole segment 2111, this arrangement prevents friction between the first stationary arc contact 11 and the second hole segment 2112 from affecting the relative movement between the first stationary arc contact 11 and the first moving arc contact 21. It also reduces structural wear on the first stationary arc contact 11 and the first moving arc contact 21, extending the service life of the switching device.

[0050] In this embodiment, the piston structure 31 has a mounting hole, and the second stationary arc contact 32 passes through and is fixedly connected to the mounting hole. The first end of the second stationary arc contact 32 extends into the second gas chamber 222 to cooperate with the second moving arc contact 24; the second end of the second stationary arc contact 32 can extend into the first moving arc contact 21 to move relative to the first moving arc contact 21. Thus, the above arrangement ensures, on the one hand, that the second stationary arc contact 32 can extinguish the arc with the second moving arc contact 24, thereby improving the breaking reliability of the switching device; on the other hand, it realizes the relative movement between the second stationary arc contact 32 and the first moving arc contact 21.

[0051] Optionally, a friction-reducing structure is provided between the first stationary arc contact 11 and the first hole section 2111. In this way, during the sliding process of the first moving arc contact 21 relative to the first stationary arc contact 11, the aforementioned provision of the friction-reducing structure can further reduce the friction between the two, thereby extending the service life of the switching device.

[0052] Optionally, the friction-reducing structure can be made of rubber or silicone.

[0053] In this embodiment, the central axis of the second moving arc contact 24 is coaxial with the central axis of the first moving arc contact 21; and / or, the central axis of the second stationary arc contact 32 is coaxial with the central axis of the first stationary arc contact 11. Thus, when the switching device is in the closed state, the above arrangement ensures that the first stationary arc contact 11 extends into the first moving arc contact 21 and the second stationary arc contact 32 extends into the second moving arc contact 24; when the switching device is in the open state, the above arrangement ensures that the first stationary arc contact 11 is separated from the first moving arc contact 21 and the second stationary arc contact 32 is separated from the second moving arc contact 24.

[0054] In this embodiment, the second moving arc contact 24 is fixedly connected to the first end of the pull rod 23 and located within the second air chamber 222. This arrangement improves the connection stability of the internal structure of the switching device.

[0055] In this embodiment, the second stationary arc contact 32 is a rod of equal diameter. This design simplifies the structure of the second stationary arc contact 32, making it easier to manufacture and implement, and reducing the overall manufacturing cost and difficulty of the switching device.

[0056] Optionally, the extension direction of the pull rod 23 is consistent with the extension direction of the second static arc contact 32; and / or, the extension direction of the sealing plate 224 is set at an angle to the extension direction of the pull rod 23. In this way, the above-mentioned arrangement improves the operational stability of the moving contact assembly 20, thereby improving the reliability of the opening and closing of the switching device on the one hand, and improving the breaking capacity of the switching device on the other hand.

[0057] In this embodiment, the angle between the extending direction of the sealing plate 224 and the extending direction of the pull rod 23 is 90°.

[0058] In this embodiment, the first stationary arc contact 11 and the first moving arc contact 21 are slidably connected to conduct current. The first moving arc contact 21 and the second stationary arc contact 32 are slidably connected to conduct current. The second stationary arc contact 32 and the second moving arc contact 24 are slidably connected to conduct current.

[0059] Specifically, the working principle of the switching device is as follows:

[0060] like Figure 1As shown, the switching device is in the closed state at this time, and the current flows through the first stationary arc contact 11, the first moving arc contact 21, the second stationary arc contact 32, and the second moving arc contact 24 in sequence.

[0061] like Figure 2 As shown, during the opening process of the switching device, the pull rod 23 drives the cylinder 22, the first moving arc contact 21, and the second moving arc contact 24 to move to the right. The second stationary arc contact 32 is inserted into the first moving arc contact 21, so that a first arc 51 is generated between the first stationary arc contact 11 and the first moving arc contact 21, and a second arc 52 is generated between the second stationary arc contact 32 and the second moving arc contact 24. Due to the blocking effect of the first arc 51, the gas pressure in the first air chamber 221 increases, resulting in increased opening resistance. Meanwhile, the gas in the second air chamber 222 is heated by the second arc 52, increasing the pressure on the sealing plate 224 and generating a force to the right. This facilitates the rightward movement of the moving contact assembly 20, thereby increasing the opening speed. At the same time, it increases the pressure in the first air chamber 221, improving the ability to extinguish the first arc 51.

[0062] like Figure 2 As shown, the circuit breaker is now in the tripped position.

[0063] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0064] The interrupting device includes a stationary contact assembly, a moving contact assembly, and a piston assembly. The stationary contact assembly includes a first stationary arc contact. The moving contact assembly includes a first moving arc contact, a cylinder, a pull rod, and a second moving arc contact. The first moving arc contact is located within and connected to the cylinder. The first end of the pull rod passes through the cylinder, allowing the moving contact assembly to move towards or away from the stationary contact assembly. The second moving arc contact is disposed on the first end of the pull rod. The piston assembly includes a piston structure and a second stationary arc contact located within the cylinder. The second stationary arc contact passes through the piston structure. The cylinder is movably disposed relative to the piston structure. The piston structure divides the inner cavity of the cylinder into a first gas chamber and a second gas chamber. The first moving arc contact and a portion of the second stationary arc contact are located in the first gas chamber, and the second moving arc contact and another portion of the second stationary arc contact are located in the second gas chamber. The moving contact assembly has a nozzle communicating with the first gas chamber, from which gas is ejected for arc extinguishing. In this way, during the opening process, the operator pulls the lever, causing the moving contact assembly to move away from the stationary contact assembly. The second stationary arc contact extends into the first moving arc contact, generating an electric arc between the first stationary and moving arc contacts, and between the second stationary and moving arc contacts. The arc between the first stationary and moving arc contacts creates a blocking effect, increasing the gas pressure in the first air chamber and improving the arc's extinguishing ability. In the second air chamber, the arc generated between the second stationary and moving arc contacts heats the gas, increasing the air pressure. Under this pressure, the cylinder moves away from the stationary contact assembly, thereby increasing the opening speed of the switching device. This solves the problem of the low opening speed of existing switching devices affecting their breaking capacity and response efficiency, thus improving the breaking capacity of the switching device.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 first stationary arc contact (11), and the moving contact assembly (20) includes a first moving arc contact (21) and a cylinder (22), wherein the first moving arc contact (21) is located within and connected to the cylinder (22); characterized in that, The moving contact assembly (20) further includes a pull rod (23) and a second moving arc contact (24). The first end of the pull rod (23) passes through the cylinder body (22) to drive the moving contact assembly (20) toward or away from the stationary contact assembly (10). The second moving arc contact (24) is disposed on the first end of the pull rod (23). The breaking device further includes: The piston assembly (30) includes a piston structure (31) and a second static arc contact (32) located within the cylinder (22). The second static arc contact (32) passes through the piston structure (31). The cylinder (22) is movably disposed relative to the piston structure (31). The piston structure (31) divides the inner cavity of the cylinder (22) into a first gas chamber (221) and a second gas chamber (222). The first moving arc contact (21) and a portion of the second static arc contact (32) are located in the first gas chamber (221), and the second moving arc contact (24) and another portion of the second static arc contact (32) are located in the second gas chamber (222). The moving contact assembly (20) has a nozzle (40) communicating with the first gas chamber (221), and the gas ejected from the nozzle (40) is used for arc extinguishing. The first moving arc contact (21) has a third guide through hole (211), the third guide through hole (211) comprising: The first hole section (2111) is used to pass through the first static arc contact (11). The second hole section (2112) is connected to the first hole section (2111) for passing through the second static arc contact (32). When the switching device is in the closed state, at least a portion of the second static arc contact (32) extends into the second hole section (2112).

2. The switching device according to claim 1, characterized in that, The piston assembly (30) also includes: The fixing part (33) is connected to the outer cover of the breaking device. The fixing part (33) has a first guide through hole (331). The pull rod (23) passes through the first guide through hole (331). The extension direction of the first guide through hole (331) is consistent with the extension direction of the pull rod (23). The connecting rod (34) has two ends connected to the piston structure (31) and the fixing part (33) respectively.

3. The switching device according to claim 2, characterized in that, The cylinder (22) includes: A cylindrical body (223), wherein the first moving arc contact (21) is disposed at one end of the cylindrical body (223); A sealing plate (224) is disposed on the other end of the cylindrical body (223), and the pull rod (23) passes through the sealing plate (224) and is fixedly connected to the sealing plate (224); The sealing plate (224) has a second guide hole (2241), the connecting rod (34) passes through the second guide hole (2241), and the piston assembly (30) further includes: A first sealing structure is disposed between the wall of the second guide through hole (2241) and the connecting rod (34); the extension direction of the second guide through hole (2241) is consistent with the extension direction of the connecting rod (34); and / or, the connecting rod (34) is made of insulating material; and / or, the connecting rod (34) is one; or, the connecting rod (34) is multiple, and the multiple connecting rods (34) are arranged circumferentially around the pull rod (23).

4. The switching device according to claim 1, characterized in that, The diameter of the second hole segment (2112) is larger than the diameter of the first hole segment (2111).

5. The switching device according to claim 2, characterized in that, The piston structure (31) has a mounting hole, the second stationary arc contact (32) passes through the mounting hole and is fixedly connected to the mounting hole, the first end of the second stationary arc contact (32) extends into the second air chamber (222) to cooperate with the second moving arc contact (24); the second end of the second stationary arc contact (32) can extend into the first moving arc contact (21) to move relative to the first moving arc contact (21).

6. The switching device according to claim 1, characterized in that, A wear-reducing structure is provided between the first static arc contact (11) and the first hole section (2111).

7. The switching device according to claim 2, characterized in that, The central axis of the second moving arc contact (24) is coaxial with the central axis of the first moving arc contact (21); and / or, the central axis of the second stationary arc contact (32) is coaxial with the central axis of the first stationary arc contact (11).

8. The switching device according to claim 2, characterized in that, The second moving arc contact (24) is fixedly connected to the first end of the pull rod (23) and located in the second air chamber (222).

9. The switching device according to claim 2, characterized in that, The second static arc contact (32) is a rod of equal diameter.

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