A switching device

Abstract

The utility model belongs to electrical equipment technical field discloses a kind of switch devices, including gas tank and the static contact and moving contact assembly being located in gas tank, moving contact assembly includes first insulating seat, insulating sliding sleeve and moving contact, the first end of first insulating seat towards static contact is equipped with the sliding slot of the first end sliding plug-in of insulating sliding sleeve, and the outer periphery between insulating sliding sleeve and the groove wall of sliding slot forms seal;Insulating sliding sleeve is equipped with first gas guide channel and mounting hole, and the first end of first gas guide channel is communicated with sliding slot, and the second end of first gas guide channel is towards static contact;The first end of moving contact is plugged into mounting hole, and the second end of moving contact is set towards static contact;Static contact is equipped with second gas guide channel, and the first end of second gas guide channel is set towards moving contact and penetrates the first end of static contact, and the second end of second gas guide channel penetrates the second end or outer periphery of static contact.The switch device provided by the utility model is favorable to improve the arc extinguishing performance when switch device closes.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a switching device. Background Technology

[0002] Sulfur hexafluoride (SF6) switches are switches that use sulfur hexafluoride (SF6) gas as both the arc-extinguishing and insulating medium, and have excellent insulation properties.

[0003] In related technologies, the stationary contact assembly of an SF6 switch is installed inside a gas chamber. The arc generated by the opening and closing of the stationary contact assembly relies entirely on the SF6 gas within the chamber. However, during the opening and closing of the stationary contact assembly, the flow of SF6 gas at the assembly is relatively turbulent, which is not conducive to arc extinguishing and affects the arc extinguishing performance of the SF6 switch. Utility Model Content

[0004] The purpose of this invention is to provide a switching device that improves arc extinguishing performance by guiding airflow.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A switching device is provided, including a gas box and a moving contact assembly and a stationary contact disposed within the gas box, wherein the gas box is filled with an insulating gas;

[0007] The moving contact assembly includes a first insulating base, an insulating sleeve, and a moving contact. The first insulating base has a groove at one end facing the stationary contact. The first end of the insulating sleeve is slidably inserted into the groove, and a seal is formed between the outer periphery of the insulating sleeve and the groove wall. The insulating sleeve has a first air guide channel and a mounting hole. The first end of the first air guide channel communicates with the groove, and the second end of the first air guide channel faces the stationary contact. The first end of the moving contact is inserted into the mounting hole, and the second end of the moving contact faces the stationary contact.

[0008] The stationary contact is provided with a second air guide channel. The first end of the second air guide channel is disposed toward the moving contact and passes through the first end of the stationary contact. The second end of the second air guide channel passes through the second end or the outer periphery of the stationary contact.

[0009] The insulating sleeve slides from the open position to the closed position, which allows the insulating gas in the gas box to be drawn into the groove through the first air guide channel, and allows the insulating gas in the second air guide channel to flow from the second end of the second air guide channel toward the first end of the second air guide channel.

[0010] The insulating sleeve slides from the closed position to the open position, which allows the insulating gas in the groove to be discharged from the first air guide channel into the air box and flow toward the stationary contact, and allows the insulating gas in the second air guide channel to flow from the first end of the second air guide channel to the second end of the second air guide channel.

[0011] Optionally, both the first air guide channel and the mounting hole extend along the sliding direction of the insulating sleeve, and at least two first air guide channels are provided around the mounting hole at intervals.

[0012] Optionally, the first end of the insulating sleeve is provided with a first groove, and the first ends of the first air guide channel and the mounting hole both penetrate the bottom of the first groove;

[0013] And / or, the second end of the insulating sleeve is provided with a second groove, the second ends of the first air guide channel and the mounting hole both penetrate the bottom of the second groove, and the second end of the moving contact is located in the second groove.

[0014] Optionally, the moving contact assembly further includes an air guide ring, which is disposed in the second groove and located at the end of the second groove. The outer periphery of the air guide ring forms a seal with the groove wall of the second groove, and the first end of the stationary contact can pass through the air guide ring and be electrically connected to the moving contact.

[0015] Optionally, the second air guide channel includes a first air guide groove and air guide holes. The first air guide groove is disposed at the first end of the stationary contact. Multiple air guide holes are provided at intervals along the circumference of the stationary contact. One end of the air guide hole is connected to the first air guide groove, and the other end of the air guide hole passes through the outer periphery of the stationary contact.

[0016] Optionally, the moving contact includes a contact body, a first clamping structure, and a second clamping structure. The contact body is inserted into the mounting hole and has a through hole. The first clamping structure is located at a first end of the contact body, and the second clamping structure is located at a second end of the contact body. The second clamping structure is used to clamp the outer periphery of the first end of the stationary contact. The switching device also includes a first conductive rod. The first conductive rod is slidably inserted into the through hole, and the first clamping structure is used to clamp the outer periphery of the first conductive rod.

[0017] And / or, the switching device further includes a second conductive rod connected to a second end of the stationary contact.

[0018] Optionally, the second end of the insulating sleeve is provided with a second groove, the second end of the first air guide channel and the second end of the mounting hole both penetrate the bottom of the second groove, and the end of the second clamping structure away from the contact body is located in the second groove.

[0019] Optionally, the switching device further includes a second insulating base, the second insulating base having a second air guide groove at one end facing the moving contact, the stationary contact being fixedly connected to the second insulating base, and at least a portion of the stationary contact being located within the second air guide groove;

[0020] The second end of the insulating sleeve located in the closed position is inserted into the second air guide groove, and an air guide gap is formed between the second end of the insulating sleeve and the groove wall of the second air guide groove.

[0021] The insulating sleeve located in the open position is outside the second air guide groove.

[0022] Optionally, the first end of the stationary contact protrudes outside the second air guide groove.

[0023] Optionally, the moving contact includes a contact body and a second clamping structure. The contact body is inserted into the mounting hole, and the second clamping structure is disposed at the second end of the contact body. The second clamping structure is used to clamp the outer periphery of the first end of the stationary contact.

[0024] The second end of the insulating sliding sleeve is provided with a second groove, the second end of the first air guide channel and the second end of the mounting hole both penetrate the bottom of the second groove, and the end of the second clamping structure away from the contact body is located in the second groove;

[0025] The distance between the end of the second clamping structure away from the contact body and the end of the second groove is set as S1, and the distance between the first end of the stationary contact and the end of the second air guide groove is set as S2, where S1 ≠ S2.

[0026] Beneficial Effects: The switching device provided by this utility model, when closed, has its insulating sleeve sliding from the open position to the closed position. Insulating gas in the gas box is drawn into the sliding groove through the first gas guide channel, creating a negative pressure between the moving and stationary contacts. Because the second end of the first gas guide channel faces the stationary contact, and the first end of the second gas guide channel faces the moving contact and penetrates the first end of the stationary contact, the insulating gas in the second gas guide channel can flow from the second end to the first end. This improves the flow of insulating gas between the stationary and moving contacts and allows the insulating gas at both the moving and stationary contacts to flow in a more stable direction, which is beneficial for arc elongation. Under a more stable flow of insulating gas, the elongated arc can contact more insulating gas, which helps improve the arc-extinguishing performance of the switching device when closed.

[0027] When the switchgear opens, the insulating sleeve slides from the closed position to the open position. The insulating gas in the groove is discharged into the gas box through the first gas guide channel and flows towards the stationary contact. Because the second end of the first gas guide channel faces the stationary contact, and the first end of the second gas guide channel faces the moving contact and penetrates the first end of the stationary contact, the insulating gas in the second gas guide channel can flow from the first end of the second gas guide channel to the second end of the second gas guide channel. This improves the flow of the insulating gas between the stationary and moving contacts and allows the insulating gas at the moving and stationary contacts to flow in a more stable direction, which is beneficial for arc elongation. With a more stable flow of insulating gas, the elongated arc can come into contact with more insulating gas, which is beneficial for improving the arc extinguishing performance of the switchgear when opening. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the switching device provided by this utility model when it is closed;

[0029] Figure 2 This is a partial cross-sectional view of the moving contact assembly when the switching device provided by this utility model is tripped;

[0030] Figure 3 This is a partial cross-sectional view of the switching device provided by this utility model at the stationary contact.

[0031] Figure 4 This is a cross-sectional view of the switching device provided by this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the switching device provided by this utility model;

[0033] Figure 6 This is a partial structural diagram of the operating mechanism provided by this utility model at the moving contact component.

[0034] In the picture:

[0035] 100. Air box; 110. Reinforcing rib;

[0036] 200. Stationary contact; 210. Second air guide channel; 211. First air guide groove; 212. Air guide hole;

[0037] 300. Moving contact assembly; 310. First insulating seat; 311. Slide groove; 312. Limiting protrusion; 320. Insulating sliding sleeve; 321. First air guide channel; 322. Mounting hole; 323. First groove; 324. Second groove; 325. Transmission groove; 330. Moving contact; 331. Contact body; 3311. Snap ring; 3312. Positioning shoulder; 3313. Through hole; 332. First clamping structure; 3321. Elastic sheet; 3322. Elastic ring; 333. Second clamping structure; 340. Sealing ring; 350. Air guide ring;

[0038] 410. First conductive rod; 411. First rod; 412. Second rod; 420. First insulating sleeve;

[0039] 510. Second conductive rod; 520. Second insulating sleeve;

[0040] 600, Second insulating base; 610, Second air guide groove; 620, Air guide gap;

[0041] 700, Operating mechanism; 710, Rotating shaft; 720, Swing arm; 730, Cylindrical component. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication 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 utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] Reference Figures 1 to 4 As shown, this embodiment provides a switching device, which includes a gas box 100 and a stationary contact 200 and a moving contact assembly 300 disposed in the gas box 100. The gas box 100 is filled with insulating gas.

[0047] The moving contact assembly 300 includes a first insulating base 310, an insulating sleeve 320, and a moving contact 330. The first insulating base 310 has a groove 311 at one end facing the stationary contact 200. The first end of the insulating sleeve 320 is slidably inserted into the groove 311, and a seal is formed between the outer periphery of the insulating sleeve 320 and the groove wall of the groove 311. The insulating sleeve 320 has a first air guide channel 321 and a mounting hole 322. The first end of the first air guide channel 321 communicates with the groove 311, and the second end of the first air guide channel 321 faces the stationary contact 200. The first end of the moving contact 330 is inserted into the mounting hole 322, and the second end of the moving contact 330 is positioned facing the stationary contact 200.

[0048] The stationary contact 200 is provided with a second air guide channel 210. The first end of the second air guide channel 210 is disposed towards the moving contact 330 and passes through the first end of the stationary contact 200. The second end of the second air guide channel 210 passes through the second end or the outer periphery of the stationary contact 200.

[0049] Understandably, the insulating sleeve 320 slides relative to the first insulating base 310 in both a closed and an open position. When the insulating sleeve 320 is in the closed position, the moving contact 330 is electrically connected to the stationary contact 200, meaning the switchgear is closed. When the insulating sleeve 320 is in the open position, the moving contact 330 is disconnected from the stationary contact 200, meaning the switchgear is open.

[0050] It is understandable that both closing and opening of the switching device will generate an electric arc. The insulating gas decomposes under the action of the electric arc, producing free radicals and ions. These particles can recombine with the charged particles in the electric arc, rapidly absorbing the energy of the electric arc and causing the electric arc to extinguish.

[0051] For example, when the insulating sleeve 320 slides from the open position to the closed position, the insulating gas in the gas box 100 is drawn into the slide groove 311 through the first air guide channel 321, and the insulating gas in the second air guide channel 210 flows from the second end of the second air guide channel 210 toward the first end of the second air guide channel 210. Understandably, when the switchgear closes, the insulating sleeve 320 slides from the open position to the closed position. The insulating gas in the gas box 100 is drawn into the slide groove 311 through the first gas guide channel 321, creating a negative pressure between the moving contact 330 and the stationary contact 200. Because the second end of the first gas guide channel 321 faces the stationary contact 200, and the first end of the second gas guide channel 210 faces the moving contact 330 and penetrates the first end of the stationary contact 200, the insulating gas in the second gas guide channel 210 can flow from the second end of the second gas guide channel 210 to the first end of the second gas guide channel 210. This improves the flow of the insulating gas between the stationary contact 200 and the moving contact 330, and allows the insulating gas at the moving contact 330 and the stationary contact 200 to flow in a more stable direction, which is beneficial for arc elongation. With a more stable flow of insulating gas, the elongated arc can come into contact with more insulating gas, which is beneficial for improving the arc extinguishing performance of the switchgear when closing.

[0052] For example, when the insulating sleeve 320 slides from the closed position to the open position, the insulating gas in the slide groove 311 is discharged from the first air guide channel 321 into the air box 100 and flows toward the stationary contact 200, and the insulating gas in the second air guide channel 210 flows from the first end of the second air guide channel 210 toward the second end of the second air guide channel 210. Understandably, when the switchgear opens, the insulating sleeve 320 slides from the closed position to the open position. The insulating gas in the groove 311 is discharged into the gas box 100 through the first gas channel 321 and flows towards the stationary contact 200. Since the second end of the first gas channel 321 faces the stationary contact 200, and the first end of the second gas channel 210 faces the moving contact 330 and passes through the first end of the stationary contact 200, the insulating gas in the second gas channel 210 can flow from the first end of the second gas channel 210 to the second end of the second gas channel 210. This improves the flow of insulating gas between the stationary contact 200 and the moving contact 330, and allows the insulating gas at the moving contact 330 and the stationary contact 200 to flow in a more stable direction, which is beneficial for arc elongation. With a more stable flow of insulating gas, the elongated arc can come into contact with more insulating gas, which is beneficial for improving the arc extinguishing performance of the switchgear when opening.

[0053] For example, the insulating gas can be SF6 gas.

[0054] For example, the first insulating base 310 is made of polycarbonate (PC).

[0055] For example, the insulating sleeve 320 is made of PC material.

[0056] In one feasible implementation, such as Figure 2 As shown, a sealing ring 340 is provided between the insulating sliding sleeve 320 and the first insulating seat 310. The insulating sliding sleeve 320 and the first insulating seat 310 form a seal through the sealing ring 340, which facilitates assembly and is conducive to the intake of insulating gas in the gas box 100 into the slide groove 311 through the first air guide channel 321, and to the discharge of insulating gas in the slide groove 311 into the gas box 100 through the first air guide channel 321.

[0057] For example, the outer periphery of the insulating sleeve 320 is provided with an annular groove (not shown), and the sealing ring 340 is disposed in the annular groove for easy positioning and assembly.

[0058] For example, the first insulating seat 310 extends into the groove 311 at the end of the groove 311 and is provided with a limiting protrusion 312. The limiting protrusion 312 can block the sealing ring 340 to reduce the risk of the insulating sleeve 320 disengaging from the groove 311. For example, the limiting protrusion 312 can be annular; or, multiple limiting protrusions 312 are provided at intervals along the circumference of the sealing ring 340.

[0059] In one feasible implementation, such as Figure 2 As shown, the first air guide channel 321 and the mounting hole 322 both extend along the sliding direction of the insulating sleeve 320, and the first air guide channel 321 is provided with at least two, such as four, five or six, spaced around the mounting hole 322, which is conducive to the flow of insulating gas at the moving contact 330 and the stationary contact 200 in a more stable direction.

[0060] In one feasible implementation, such as Figure 2 As shown, the first end of the insulating sleeve 320 is provided with a first groove 323, and the first ends of the first air guide channel 321 and the mounting hole 322 both penetrate the bottom of the first groove 323. In this embodiment, the provision of the first groove 323 is beneficial to improving the compactness of the moving contact assembly 300. In addition, compared with the moving contact assembly 300 which only accommodates insulating gas through the groove 311 of the first insulating seat 310, a cavity that can accommodate insulating gas is formed between the groove 311 and the first groove 323. The gas pressure change in the cavity is smaller, which is beneficial to improving the opening and closing speed and arc extinguishing performance of the switching device.

[0061] In one feasible implementation, such as Figure 2As shown, the second end of the insulating sleeve 320 is provided with a second groove 324. The second ends of the first air guide channel 321 and the mounting hole 322 both penetrate the bottom of the second groove 324, and the second end of the moving contact 330 is located in the second groove 324. In this embodiment, the provision of the second groove 324 facilitates the flow of insulating gas at the moving contact 330 and the stationary contact 200 in a more stable direction when the switching device is opened and closed, and also helps to improve the compactness of the moving contact assembly 300.

[0062] In one feasible implementation, such as Figure 2 As shown, the moving contact assembly 300 also includes a gas guide ring 350, which is disposed within the second groove 324 and located at the end of the second groove 324. A seal is formed between the outer periphery of the gas guide ring 350 and the groove wall of the second groove 324. The first end of the stationary contact 200 can pass through the gas guide ring 350 and be electrically connected to the moving contact 330. It can be understood that insulating gas enters and exits the second groove 324 via the gas guide ring 350. The gas guide ring 350 has a gas-gathering effect, which is beneficial for improving the flow of insulating gas between the stationary contact 200 and the moving contact 330, improving the flow of insulating gas in the second gas guide channel 210 when the insulating sleeve 320 slides, and also beneficial for arc elongation, improving the arc-extinguishing performance of the switching device during opening.

[0063] For example, when the stationary contact 200 is inserted into the air guide ring 350, the stationary contact 200 can form a seal with the air guide ring 350 or a gap with the air guide ring 350. This embodiment does not limit this.

[0064] For example, the air guide ring 350 has a first transition surface (not shown) on the inner side of the end away from the moving contact 330. The transition surface includes, but is not limited to, a chamfered surface or a rounded surface.

[0065] For example, the gas guide ring 350 has a relief surface (not shown) at one end near the moving contact 330. The relief surface includes, but is not limited to, a chamfered surface or a rounded surface, so that a channel for insulating gas to pass through is formed between the gas guide ring 350 and the moving contact 330, which helps to improve the compactness of the moving contact assembly 300.

[0066] In this embodiment, reference is made to Figure 1 and Figure 2 As shown, the moving contact 330 includes a contact body 331, which is inserted into the mounting hole 322 for easy assembly. The contact body 331 can be electrically connected to the stationary contact 200 when the switching device is closed.

[0067] For example, the first end of the contact body 331 is inserted into the mounting hole 322 and is secured with a retaining ring 3311, and the second end of the contact body 331 has a positioning shoulder 3312 on its outer periphery. The two ends of the mounting hole 322 are sandwiched between the positioning shoulder 3312 and the retaining ring 3311.

[0068] In one feasible embodiment, the contact body 331 is provided with a through hole 3313, and the switching device further includes a first conductive rod 410, which is slidably inserted into the through hole 3313. It is understood that the end of the first conductive rod 410 away from the moving contact 330 is used to connect to an external circuit.

[0069] For example, the first end of the first conductive rod 410 is used to connect to an external circuit, and the second end of the first conductive rod 410 is slidably inserted into the through hole 3313.

[0070] For example, when the insulating sleeve 320 slides from the open position to the closed position, the second end of the first conductive rod 410 slides relative to the through hole 3313, which can make room for the through hole 3313, which is beneficial to increase the negative pressure between the moving contact 330 and the stationary contact 200, and thus facilitates the flow of insulating gas in the second air channel 210 from the second end of the second air channel 210 to the first end of the second air channel 210.

[0071] For example, when the insulating sleeve 320 slides from the closed position to the open position, the second end of the first conductive rod 410 slides relative to the through hole 3313, which can squeeze the insulating gas in the through hole 3313. This facilitates the flow of the insulating gas toward the stationary contact 200, thereby improving the flow of the insulating gas between the stationary contact 200 and the moving contact 330. It also facilitates the flow of the insulating gas in the second air guide channel 210 from the first end of the second air guide channel 210 to the second end of the second air guide channel 210.

[0072] In one feasible implementation, the moving contact 330 further includes a first clamping structure 332, which is disposed at the first end of the contact body 331. The first clamping structure 332 is used to clamp the outer periphery of the first conductive rod 410, which is beneficial to improving the electrical connection stability between the contact body 331 and the first conductive rod 410.

[0073] For example, the end of the first clamping structure 332 away from the contact body 331 is located in the first groove 323, which helps to improve the compactness of the moving contact assembly 300.

[0074] For example, the first clamping structure 332 can be configured as a kit structure, which is beneficial to improving the electrical connection stability between the contact body 331 and the first conductive rod 410.

[0075] For example, the first clamping structure 332 includes a plurality of elastic pieces 3321 and at least two elastic rings 3322. Taking the first clamping structure 332 including two elastic rings 3322 as an example, the plurality of elastic pieces 3321 are arranged circumferentially along the contact body 331. The inner side of the first end of the elastic piece 3321 is provided with a positioning protrusion (not shown), and the outer side is provided with a first slot (not shown). The outer side of the second end of the elastic piece 3321 is provided with a second slot (not shown). A first annular slot is formed between the first slots of all the elastic pieces 3321, and a second annular slot is formed between the second slots. One of the two elastic rings 3322 is engaged in the first annular slot, and the other is engaged in the second annular slot. The first end of the contact body 331 is provided with a positioning groove (not shown), and the positioning protrusion is provided in the positioning groove. The elastic ring 3322 engaged with the first annular slot can stably position the positioning protrusion in the positioning groove, effectively reducing the risk of the first clamping structure 332 disengaging from the contact body 331.

[0076] In one feasible embodiment, the switching device further includes a first insulating sleeve 420, which is sleeved on the first conductive rod 410 and connected to the first insulating base 310.

[0077] For example, the first insulating sleeve 420 and the first insulating base 310 can be connected by bolts.

[0078] For example, the first conductive rod 410 includes a first rod 411 and a second rod 412. The first end of the first rod 411 is used to connect to an external circuit, and the second end of the first rod 411 is inserted into the first insulating sleeve 420. The first end of the second rod 412 passes through the first insulating seat 310 and is connected to the first rod 411. The second end of the second rod 412 is slidably inserted into the through hole 3313. The first clamping structure 332 is used to clamp the outer periphery of the second rod 412.

[0079] For example, the first rod 411 and the second rod 412 are arranged on the same axis.

[0080] For example, the first rod 411 and the second rod 412 can be connected by threaded fastening.

[0081] In one feasible implementation, the moving contact 330 further includes a second clamping structure 333, which is disposed at the second end of the contact body 331. The second clamping structure 333 is used to clamp the outer periphery of the first end of the stationary contact 200, which is beneficial to improving the electrical connection stability between the moving contact 330 and the stationary contact 200.

[0082] For example, the second clamping structure 333 can be configured as a kit structure. In some embodiments, when the insulating sleeve 320 slides from the open position to the closed position, the second clamping structure 333 can be sleeved on the stationary contact 200 and create a negative pressure in the through hole 3313. The insulating gas in the second air channel 210 flows from the second end of the second air channel 210 to the first end of the second air channel 210, which facilitates the continued sliding of the insulating sleeve 320, thereby facilitating the closing and arc extinguishing of the switching device. In some embodiments, when the insulating sleeve 320 slides from the closed position to the open position, the sliding of the second end of the first conductive rod 410 relative to the through hole 3313 can compress the insulating gas in the through hole 3313, which facilitates the separation of the second clamping structure 333 from the stationary contact 200.

[0083] For example, the second clamping structure 333 has the same structure as the first clamping structure 332 and the same connection method with the contact body 331, which will not be described in detail in this embodiment.

[0084] In one feasible implementation, the end of the second clamping structure 333 away from the contact body 331 is located in the second groove 324, which is conducive to the flow of insulating gas at the moving contact 330 and the stationary contact 200 in a more stable direction when the switching device is opened and closed, and is also conducive to improving the compactness of the moving contact assembly 300.

[0085] For example, when the insulating sleeve 320 is in the open position, a portion of the first conductive rod 410 is located between the elastic plates of the second clamping structure 333. For instance, the first end of the second rod 412 is located between the elastic plates of the second clamping structure 333, which helps to improve the compactness of the moving contact assembly 300.

[0086] In this embodiment, reference is made to Figure 1 and Figure 3 As shown, the switching device also includes a second conductive rod 510, which is connected to the second end of the stationary contact 200. It can be understood that the end of the second conductive rod 510 furthest from the stationary contact 200 is used to connect to an external circuit.

[0087] For example, the second conductive rod 510 and the stationary contact 200 can be connected by threaded fastening.

[0088] In one possible implementation, the switching device further includes a second insulating sleeve 520, which is sleeved on the second conductive rod 510.

[0089] In one feasible embodiment, the second air guide channel 210 includes a first air guide groove 211 and air guide holes 212. The first air guide groove 211 is disposed at the first end of the stationary contact 200, and multiple air guide holes 212 are provided at intervals along the circumference of the stationary contact 200. One end of the air guide hole 212 is connected to the first air guide groove 211, and the other end of the air guide hole 212 penetrates through the outer periphery of the stationary contact 200, so that the insulating gas has good flow in the second air guide channel 210, which is beneficial for the electric arc to contact more insulating gas and also helps to improve the structural strength of the stationary contact 200.

[0090] For example, the end of the second air guide groove 610 is provided with a second transition surface (not shown), which includes, but is not limited to, a chamfered surface or a rounded surface. When the insulating sleeve 320 slides from the closed position to the open position and the insulating gas flows toward the stationary contact 200, the second transition surface can guide more insulating gas into the second air guide groove 610, which is beneficial to improving the flow of insulating gas between the stationary contact 200 and the moving contact 330, and to ensuring that the insulating gas at the moving contact 330 and the stationary contact 200 flows in a more stable direction, which is beneficial to the opening and arc extinguishing of the switching device.

[0091] In this embodiment, reference continues to be made to... Figure 1 and Figure 3 As shown, the switching device also includes a second insulating base 600. A second air guide groove 610 is provided at one end of the second insulating base 600 facing the moving contact 330. The stationary contact 200 is fixedly connected to the second insulating base 600, and at least a portion of the stationary contact 200 is located within the second air guide groove 610. The second air guide groove 610 guides the flow of insulating gas during the opening and closing of the switching device, which helps improve the flow of insulating gas between the stationary contact 200 and the moving contact 330, facilitates a more stable flow of insulating gas at the moving contact 330 and the stationary contact 200, promotes arc elongation, and improves the arc-extinguishing performance of the switching device during opening and closing.

[0092] For example, when the switching device is opened, the second insulating base 600 blocks the airflow, and the insulating gas between the stationary contact 200 and the moving contact 330 can diffuse in a direction perpendicular to the sliding direction of the insulating sleeve 320, which is beneficial to the elongation of the arc.

[0093] For example, the second insulating sleeve 520 and the second insulating base 600 can be connected by bolts.

[0094] For example, the stationary contact 200 has a second insulating seat 600 inserted through the bottom of the second air guide groove 610 and is connected to the second conductive rod 510.

[0095] For example, the second end of the insulating sleeve 320 located in the closed position is inserted into the second air guide groove 610, and an air guide gap 620 is formed between the second end of the insulating sleeve 320 and the groove wall of the second air guide groove 610. For example, the end and outer periphery of the second end of the insulating sleeve 320 are both formed with the groove wall of the second air guide groove 610. The formation of the air guide gap 620 is beneficial to improving the opening and closing speed of the switching device.

[0096] When the insulating sleeve 320 slides from the open position to the closed position and is inserted into the second air guide groove 610, the insulating gas in the gas box 100 can enter the second air guide groove 610 through the air guide gap 620. The insulating gas in the second air guide groove 610 can be drawn into the slide groove 311 through the first air guide channel 321. The insulating gas in the second air guide groove 610 can also enter the through hole 3313. This is conducive to the insulating gas at the moving contact 330 and the stationary contact 200 flowing in a more stable direction, which is conducive to the elongation of the arc and improves the arc extinguishing performance of the switching device when it is closed.

[0097] When the insulating sleeve 320 slides from the closed position to the open position and is inserted into the second air guide groove 610, the gas in the second air guide groove 610 can be discharged into the gas box 100 through the air guide gap 620. This is beneficial for the insulating gas at the moving contact 330 and the stationary contact 200 to flow in a more stable direction, which is beneficial for the elongation of the arc and improves the arc extinguishing performance of the switchgear when it is opened.

[0098] For example, the second insulating base 600 is made of PC material.

[0099] In one feasible implementation, the first end of the stationary contact 200 protrudes outside the second air guide groove 610.

[0100] When the insulating sleeve 320 slides from the open position to the closed position, because the end of the second clamping structure 333 away from the contact body 331 is located in the second groove 324, the first end of the stationary contact 200 first extends into the air guide ring 350 in the second groove 324 and then connects with the second clamping structure 333, which is conducive to the generation of an electric arc in the second groove 324. The insulating gas in the gas box 100 can enter the slide groove 311 in sequence through the second air guide groove 610, the second air guide channel 210, the second groove 324 and the first air guide channel 321. The insulating gas in the gas box 100 can also enter the through hole 3313 in sequence through the second air guide groove 610, the second air guide channel 210 and the air guide ring 350, which is conducive to the flow stability of the insulating gas and the elongation of the electric arc, and improves the arc extinguishing performance of the switching device when it is closed. When a gap is formed between the stationary contact 200 and the air guide ring 350, the insulating gas can also enter the slide groove 311 through the second air guide groove 610, the gap formed between the stationary contact 200 and the air guide ring 350, the second groove 324 and the first air guide channel 321, which is beneficial to the flow stability of the insulating gas and the elongation of the arc, and improves the arc extinguishing performance of the switching device when it is closed.

[0101] When the insulating sleeve 320 slides from the closed position to the open position, because the end of the second clamping structure 333 away from the contact body 331 is located in the second groove 324, the first end of the stationary contact 200 first separates from the second clamping structure 333 and then disengages from the gas guide ring 350 in the second groove 324, which is conducive to the generation of an electric arc in the second groove 324. The insulating gas in the groove 311 and the insulating gas through the hole 3313 flow into the second gas guide channel 210, which is conducive to the flow stability of the insulating gas and the elongation of the electric arc, thus improving the arc extinguishing performance of the switching device when it is closed.

[0102] For example, combined Figure 2 and Figure 3 As shown, the distance between the end of the second clamping structure 333 furthest from the contact body 331 and the end of the second groove 324 is set as S1, and the distance between the first end of the stationary contact 200 and the end of the second air guide groove 610 is set as S2, where S1 ≠ S2. Taking S1 < S2 as an example, the second clamping structure 333 is first connected to the stationary contact 200, and then the insulating sleeve 320 is inserted into the second air guide groove 610, which is beneficial to the stability of the flow of insulating gas and the elongation of the arc. In addition, after the second clamping structure 333 is connected to the stationary contact 200, it can guide the sliding of the insulating sleeve 320, which is beneficial to the insertion of the insulating sleeve 320 into the second air guide groove 610, reducing the risk of interference between the insulating sleeve 320 and the second insulating seat 600, and thus facilitating the closing of the switching device.

[0103] In this embodiment, reference is made to Figure 2 , Figure 5 and Figure 6As shown, the switching device also includes an operating mechanism 700, which is connected to the insulating sleeve 320 and is used to drive the insulating sleeve 320 to slide.

[0104] In one feasible embodiment, the operating mechanism 700 includes at least a rotating shaft 710 and a rocker arm 720 connected to the rotating shaft 710. The rocker arm 720 has two cylindrical members 730. An insulating sleeve 320 has a transmission groove 325 on its outer periphery opposite to the cylindrical members 730, and the insulating sleeve 320 is sandwiched between the two cylindrical members 730. Rotation of the rotating shaft 710 can cause the rocker arm 720 to swing, thereby causing the outer periphery of the cylindrical members 730 to push against the groove wall of the transmission groove 325, thus realizing the sliding of the insulating sleeve 320.

[0105] For example, the cylindrical member 730 can be fastened to the rocker arm 720 by bolts.

[0106] In this embodiment, a stationary contact 200 and a moving contact assembly 300 are set as a group, and at least one group of stationary contacts 200 and moving contact assemblies 300 are provided in the air box 100. For example, three groups of stationary contacts 200 and moving contact assemblies 300 are arranged side by side in the air box 100.

[0107] For example, the air box 100 is provided with reinforcing ribs 110 to improve the structural strength of the air box 100.

[0108] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A switching device, characterized in that, It includes a gas box (100) and a moving contact assembly (300) and a stationary contact (200) disposed within the gas box (100), the gas box (100) being filled with insulating gas; The moving contact assembly (300) includes a first insulating base (310), an insulating sleeve (320), and a moving contact (330). The first insulating base (310) has a groove (311) at one end facing the stationary contact (200). The first end of the insulating sleeve (320) is slidably inserted into the groove (311), and a seal is formed between the outer periphery of the insulating sleeve (320) and the groove wall of the groove (311). The insulating sleeve (320) has a first air guide channel (321) and a mounting hole (322). The first end of the first air guide channel (321) communicates with the groove (311), and the second end of the first air guide channel (321) faces the stationary contact (200). The first end of the moving contact (330) is inserted into the mounting hole (322), and the second end of the moving contact (330) faces the stationary contact (200). The stationary contact (200) is provided with a second air guide channel (210). The first end of the second air guide channel (210) is disposed toward the moving contact (330) and passes through the first end of the stationary contact (200). The second end of the second air guide channel (210) passes through the second end or the outer periphery of the stationary contact (200). The insulating sleeve (320) slides from the open position to the closed position, which allows the insulating gas in the gas box (100) to be drawn into the groove (311) through the first air guide channel (321), and allows the insulating gas in the second air guide channel (210) to flow from the second end of the second air guide channel (210) toward the first end of the second air guide channel (210); The insulating sleeve (320) slides from the closed position to the open position, which allows the insulating gas in the slide groove (311) to be discharged from the first air guide channel (321) into the air box (100) and flow toward the stationary contact (200), and allows the insulating gas in the second air guide channel (210) to flow from the first end of the second air guide channel (210) toward the second end of the second air guide channel (210).

2. The switching device according to claim 1, characterized in that, The first air guide channel (321) and the mounting hole (322) both extend along the sliding direction of the insulating sleeve (320), and at least two of the first air guide channels (321) are provided around the mounting hole (322) at intervals.

3. The switching device according to claim 1, characterized in that, The first end of the insulating sleeve (320) is provided with a first groove (323), and the first ends of the first air guide channel (321) and the mounting hole (322) both penetrate the bottom of the first groove (323); And / or, the second end of the insulating sleeve (320) is provided with a second groove (324), the second ends of the first air guide channel (321) and the mounting hole (322) both penetrate the bottom of the second groove (324), and the second end of the moving contact (330) is located in the second groove (324).

4. The switching device according to claim 3, characterized in that, The moving contact assembly (300) further includes an air guide ring (350), which is disposed in the second groove (324) and located at the end of the second groove (324). The outer periphery of the air guide ring (350) forms a seal with the groove wall of the second groove (324). The first end of the stationary contact (200) can pass through the air guide ring (350) and be electrically connected to the moving contact (330).

5. The switching device according to claim 1, characterized in that, The second air guide channel (210) includes a first air guide groove (211) and an air guide hole (212). The first air guide groove (211) is located at the first end of the stationary contact (200). Multiple air guide holes (212) are spaced apart along the circumference of the stationary contact (200). One end of the air guide hole (212) is connected to the first air guide groove (211), and the other end of the air guide hole (212) passes through the outer periphery of the stationary contact (200).

6. The switching device according to claim 1, characterized in that, The moving contact (330) includes a contact body (331), a first clamping structure (332), and a second clamping structure (333). The contact body (331) is inserted into the mounting hole (322). The contact body (331) has a through hole (3313). The first clamping structure (332) is located at the first end of the contact body (331), and the second clamping structure (333) is located at the second end of the contact body (331). The second clamping structure (333) is used to clamp the outer periphery of the first end of the stationary contact (200). The switching device also includes a first conductive rod (410). The first conductive rod (410) is slidably inserted into the through hole (3313), and the first clamping structure (332) is used to clamp the outer periphery of the first conductive rod (410). And / or, the switching device further includes a second conductive rod (510) connected to a second end of the stationary contact (200).

7. The switching device according to claim 6, characterized in that, The second end of the insulating sleeve (320) is provided with a second groove (324), the second ends of the first air guide channel (321) and the mounting hole (322) both penetrate the bottom of the second groove (324), and the end of the second clamping structure (333) away from the contact body (331) is located in the second groove (324).

8. The switching device according to any one of claims 1-7, characterized in that, The switching device further includes a second insulating base (600), the second insulating base (600) having a second air guide groove (610) at one end facing the moving contact (330), the stationary contact (200) being fixedly connected to the second insulating base (600), and at least a portion of the stationary contact (200) being located within the second air guide groove (610); The second end of the insulating sleeve (320) located in the closed position is inserted into the second air guide groove (610), and an air guide gap (620) is formed between the second end of the insulating sleeve (320) and the groove wall of the second air guide groove (610); The insulating sleeve (320) located in the open position is outside the second air guide groove (610).

9. The switching device according to claim 8, characterized in that, The first end of the stationary contact (200) protrudes outside the second air guide groove (610).

10. The switching device according to claim 9, characterized in that, The moving contact (330) includes a contact body (331) and a second clamping structure (333). The contact body (331) is inserted into the mounting hole (322). The second clamping structure (333) is located at the second end of the contact body (331). The second clamping structure (333) is used to clamp the outer periphery of the first end of the stationary contact (200). The second end of the insulating sleeve (320) is provided with a second groove (324), the second ends of the first air guide channel (321) and the mounting hole (322) both penetrate the bottom of the second groove (324), and the end of the second clamping structure (333) away from the contact body (331) is located in the second groove (324); The distance between the end of the second clamping structure (333) away from the contact body (331) and the end of the second groove (324) is set as S1, and the distance between the first end of the stationary contact (200) and the end of the second air guide groove (610) is set as S2, where S1 ≠ S2.

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