Switching device

Abstract

The invention provides switch equipment, and relates to the technical field of electric arc extinguishing. The switch device comprises a static contact and a movable switch. The movable switch comprises a cylinder body, a moving contact, an air cylinder and a driving assembly. The cylinder body defines a first air chamber, and an opening is formed in one end, facing the static contact in the first direction, of the cylinder body; the moving contact comprises a moving main contact, the inner side of the moving main contact is provided with an arc extinguish chamber, the moving main contact further comprises a bottom plate, and the bottom plate is provided with a through hole; the inflator movably penetrates through the through hole in the first direction, and a vent hole is formed in the inflator; and the driving assembly is suitable for driving the air cylinder to move between a first position and a second position under the driving of the moving arc contact, the vent hole is separated from the arc extinguish chamber at the first position, and the vent hole is connected with the arc extinguish chamber at the second position. According to the switch equipment provided by the invention, the problem that the stored arc extinguishing gas is easy to continuously leak and lose after the static contact and the moving contact are closed in place can be solved.

Description

Technical Field

[0001] This application relates to the field of electric arc extinguishing technology, and more particularly to a switching device. Background Technology

[0002] Circuit breakers, grounding switches, or gas-insulated metal-enclosed switches are important components of power systems. During the tripping operation, these switchgear devices require arc extinguishing.

[0003] In the prior art, switchgear includes a stationary contact, a moving contact, and an arc-extinguishing gas storage chamber. The switchgear stores arc-extinguishing gas in the arc-extinguishing gas storage chamber, which is connected to the areas between the stationary and moving contacts where arc extinguishing is required via a gas passage.

[0004] However, in existing switchgear, after the stationary and moving contacts are closed, the corresponding gas passage remains connected to the arc-extinguishing gas storage chamber and the area between the stationary and moving contacts where arc extinguishing is required. This leads to the problem of continuous leakage and loss of the arc-extinguishing gas stored in the switchgear. Summary of the Invention

[0005] This application provides a switching device to solve the problem in existing switching devices where the arc-extinguishing gas stored in the switching device is prone to continuous leakage and loss after the stationary and moving contacts are closed.

[0006] The switching device of this application includes: a stationary contact and a movable switch; the stationary contact includes a stationary main contact and a stationary arc contact, the stationary arc contact being located radially inside the stationary main contact; the movable switch includes: a cylinder, a moving contact, an air cylinder, and a drive assembly; the cylinder defines a first air chamber, the cylinder having an opening at one end facing the stationary contact along a first direction, the first air chamber being used to store arc-extinguishing gas; the moving contact includes: a moving main contact, retractably disposed in the first air chamber along the first direction through the opening, the moving main contact having an arc-extinguishing chamber on its inner side, the moving main contact having an exhaust port communicating with the arc-extinguishing chamber at one end facing the stationary contact, the moving main contact further including a base plate opposite to the exhaust port, the base plate having... The device includes a movable hole and a through hole extending along a first direction; a movable arc contact, which passes through the movable hole along the first direction, with one end of the movable arc contact extending into the arc-extinguishing chamber and the other end extending into the first air chamber; an air cylinder, which is movably inserted through the through hole along the first direction, is hollow inside, with one end of the air cylinder open towards the first air chamber, and has a vent hole; a driving assembly is connected to the movable arc contact and the air cylinder respectively, and the driving assembly is adapted to drive the air cylinder to move between a first position and a second position under the drive of the movable arc contact, wherein, in the first position, the vent hole is isolated from the arc-extinguishing chamber, and in the second position, the vent hole is connected to the arc-extinguishing chamber.

[0007] In some embodiments, the vent is located on the side wall of the air cylinder near the arc-extinguishing chamber. In the first position, the vent is inside the through hole and is closed by the wall of the through hole. In the second position, the vent is inside the arc-extinguishing chamber.

[0008] In some embodiments, the moving arc contact has a mounting portion extending into the first air chamber, and the drive assembly includes: a rack fixed to the side wall of the mounting portion and extending along a first direction; a gear component including a gear shaft and a gear portion, the gear shaft being rotatably mounted in the cylinder and extending along a second direction, the gear portion meshing with the rack, the second direction being perpendicular to the first direction; a first bevel gear sleeved on the gear shaft; and a second bevel gear sleeved on the air cylinder, the second bevel gear meshing with the first bevel gear.

[0009] In some embodiments, the inner wall of the through hole is provided with internal threads, the outer wall of the air cylinder is provided with external threads, and the air cylinder is threadedly engaged with the base plate.

[0010] In some embodiments, the cylinder body is further provided with a second air chamber, and the first air chamber and the second air chamber are separated by a partition; the second air chamber is in continuous communication with the first air chamber, and the second air chamber is used to replenish air to the first air chamber.

[0011] In some embodiments, the switching device further includes: a sleeve disposed in the second air chamber, the sleeve defining a third air chamber, the sleeve having an air supply hole that is operably connected to the first air chamber and the second air chamber, so that the second air chamber supplies air to the first air chamber through the third air chamber.

[0012] In some embodiments, the partition plate is provided with a piston hole, and one end of the sleeve has a movable opening, which is opposite to and communicates with the piston hole. The periphery of the movable opening is sealed to the partition plate. The moving contact also includes a piston rod, which is connected to the base plate of the moving arc contact. The piston rod passes through the piston hole into the third gas chamber. When the piston rod moves with the moving arc contact to compress the third gas chamber, the gas in the third gas chamber flows into the first gas chamber. When the piston rod moves with the moving arc contact to expand the third gas chamber, the gas in the second gas chamber flows into the third gas chamber.

[0013] In some embodiments, the partition plate is further provided with an outlet hole extending along a first direction; the switchgear further includes a connecting assembly; the connecting assembly includes: a first pipeline, the inlet end of the first pipeline being connected to the outlet hole, and the outlet end being connected to the replenishment hole; a first one-way valve, disposed on the first pipeline, the first one-way valve being used to allow gas to flow unidirectionally from the third gas chamber to the first gas chamber; a second pipeline, the outlet end of the second pipeline being connected to the first pipeline and located upstream of the first one-way valve, the inlet end of the second pipeline being connected to the second gas chamber; a second one-way valve, disposed on the second pipeline, the first one-way valve being used to allow gas to flow unidirectionally from the second gas chamber to the first gas chamber.

[0014] In some embodiments, the connection assembly further includes a transition container disposed on a first pipeline between the first one-way valve and the outlet, the transition container being used for temporary storage of gas.

[0015] In some embodiments, the inner wall of the vent is provided with a switch groove. The switching device further includes: a switch element, which is movably disposed in the switch groove to open or close the vent; and a gas replenishment trigger mechanism, which is drively connected to the moving arc contact and can be detachably coupled with the switch element to drive the switch element to move.

[0016] In some embodiments, a magnetic element is provided in the switch slot, and the switch element is a magnetic attraction element; the gas replenishment triggering mechanism includes: a mounting plate, fixedly sleeved on the outside of the piston rod and located in the first gas chamber, the mounting plate having a guide hole; a movable plate, movably disposed on the side of the mounting plate opposite to the second gas chamber; a trigger rod, the trigger rod passing through the guide hole, the first end of the trigger rod being fixedly connected to the movable plate, the second end of the trigger rod having a magnetic attraction engagement element, the attraction between the magnetic attraction engagement element and the magnetic attraction element being greater than the attraction between the magnetic attraction element and the magnetic element, the trigger rod being disposed opposite to the switch slot; an elastic element, one end of the elastic element being fixedly connected to the mounting plate, and the other end being fixedly connected to the movable plate; the moving arc contact is adapted to sequentially drive the trigger rod to move through the mounting plate, the elastic element, and the movable plate, so that the magnetic attraction engagement element and the magnetic attraction element magnetically engage or disengage. Wherein, when the magnetic attraction engagement element and the magnetic attraction element are magnetically engaged, the gas outlet is closed. When the magnetic attraction component is separated from the magnetic attraction component, the magnetic component magnetically engages with the magnetic attraction component, and the air outlet opens.

[0017] In some embodiments, the partition plate is also provided with a clearance hole, which penetrates the side wall of the switch slot facing the first air chamber and communicates with the switch slot. The trigger rod can be inserted into the clearance hole so that the magnetic attraction component and the magnetic attraction component magnetically engage.

[0018] The switching device of this application defines a first gas chamber by means of a cylinder, through which arc-extinguishing gas is stored. The moving main contact is retractably disposed in the first gas chamber along a first direction via an opening. The position of the moving contact is adjusted by moving the moving main contact relative to the first gas chamber, thereby adjusting the position of the moving contact relative to the stationary contact for performing closing or disconnecting actions. During the closing or disconnecting action, the moving arc contact moves synchronously with the moving main contact.

[0019] In the switching equipment of this application, during the tripping operation, the moving main contact first disengages from the stationary main contact, and the arc is borne by the stationary arc contact and the moving arc contact. Driven by the moving arc contact and the drive assembly, the air cylinder moves from a first position to a second position, so that the vent hole connects with the arc-extinguishing chamber. At the same time, the movement of the moving main contact relative to the first air chamber compresses the volume of the first air chamber, so that the arc-extinguishing gas in the first air chamber flows through the air cylinder and the vent hole on the air cylinder to the arc-extinguishing chamber and the exhaust port, so as to extinguish the arc generated between the stationary arc contact and the moving arc contact.

[0020] During the closing operation of the switchgear of this application, the gas cylinder is moved from the second position to the first position by the moving arc contact and the drive assembly. After the circuit is closed, the gas cylinder is placed in the first position to isolate the vent from the arc-extinguishing chamber. This isolation prevents the arc-extinguishing gas in the first gas chamber from continuing to flow into the arc-extinguishing chamber, thus maintaining most of the arc-extinguishing gas in the first gas chamber. This solves the problem that the stored arc-extinguishing gas is prone to continuous leakage and loss after the stationary and moving contacts are closed. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 A schematic diagram of the structure of the switching device provided in the embodiments of this application when the air cylinder is in the first position;

[0023] Figure 2 for Figure 1 A schematic diagram of the cylinder block structure;

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of the moving main contact in the middle;

[0025] Figure 4 for Figure 1 A schematic diagram of the switching device in the middle when the air cylinder is in the second position;

[0026] Figure 5 for Figure 1 A schematic diagram of the structure of the driving component in the diagram;

[0027] Figure 6 This is a schematic diagram of the structure of the driving component in another embodiment of this application;

[0028] Figure 7 for Figure 5 A schematic diagram of the structure of the air cylinder in the diagram;

[0029] Figure 8 for Figure 7 CC section view;

[0030] Figure 9 for Figure 2 A schematic diagram of the support plate in the middle;

[0031] Figure 10 for Figure 1 An enlarged view of part A in the image;

[0032] Figure 11 for Figure 1 An enlarged view of part B in the image;

[0033] Figure 12 for Figure 1 A schematic diagram of the mounting plate in the diagram.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100 - stationary contact; 110 - stationary main contact; 120 - stationary arc contact;

[0036] 200 - Active switch; 210 - Cylinder block; 211 - First air chamber; 211a - Support plate; 211b - Shaft hole; 211c - First channel; 211d - Second channel;

[0037] 212-Opening; 213-Second chamber; 214-Baffle; 214a-Piston hole; 214b-Outlet; 214c-Switch slot; 214d-Magnetic component; 214e-Allowing hole; 215-Third chamber; 220-Moving contact; 221-Moving main contact; 221a-Arc extinguishing chamber; 221b-Exhaust port; 221c-Base plate; 221d-Moving hole; 221e-Through hole; 222-Moving arc contact; 222a- Mounting part; 223-Piston rod; 230-Air cylinder; 230a-Ventilation hole; 231-First cylinder section; 232-Second cylinder section; 232a-Guide block; 240-Drive assembly; 241-Rack; 242-Gear component; 242a-Gear shaft; 242b-Gear section; 243-First bevel gear; 244-Second bevel gear; 245-Driving rack; 246-Intermediate gear; 247-Driven rack; 250-Bearing component;

[0038] 300 - Sleeve; 310 - Air inlet; 320 - Movable port;

[0039] 400 - Connection assembly; 410 - First pipeline; 420 - First check valve; 430 - Second pipeline; 440 - Second check valve; 450 - Transition container;

[0040] 500 - Switching components;

[0041] 600 - Air replenishment trigger mechanism; 610 - Mounting plate; 611 - Guide hole; 620 - Movable plate; 630 - Trigger rod; 631 - Magnetic attachment part; 640 - Elastic part;

[0042] 700 - Insulating sleeve;

[0043] 800-Drive lever.

[0044] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0045] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0046] Circuit breakers, grounding switches, or gas-insulated metal-enclosed switches are important components of power systems. During the tripping operation, these switchgear devices require arc extinguishing.

[0047] In existing technology, switchgear includes a stationary contact, a moving contact, and an arc-extinguishing gas storage chamber. The switchgear stores arc-extinguishing gas in the storage chamber, which is connected to the area between the stationary and moving contacts where arc extinguishing is required via a gas passage. It should be noted that when an abnormal situation occurs requiring circuit disconnection (e.g., a short circuit in a power system), the moving contact moves relative to the stationary contact, disengaging from the stationary contact to perform a tripping action. During the tripping action, a large electric arc is generated between the moving and stationary contacts. Arc-extinguishing gas is supplied to the area between the stationary and moving contacts through the arc-extinguishing gas storage chamber and the gas passage to perform arc extinguishing.

[0048] However, in existing switchgear technology, after the stationary and moving contacts are fully closed, the corresponding gas passage remains connected to the arc-extinguishing gas storage chamber and the area between the stationary and moving contacts where arc extinguishing is required. This leads to a problem of continuous leakage and loss of the arc-extinguishing gas stored in the switchgear. It should be noted that "fully closed" refers to the stationary and moving contacts making contact to conduct the circuit; during most of the operation of the switchgear, the stationary and moving contacts are in the closed state, meaning the circuit is conducting, and are typically only disconnected when a circuit malfunction occurs.

[0049] In order to solve the problem that the arc-extinguishing gas stored in the switchgear is prone to continuous leakage and loss after the stationary and moving contacts are closed in the position in the prior art, this application provides a switchgear.

[0050] The switching device of this application defines a first gas chamber by means of a cylinder, through which arc-extinguishing gas is stored. The moving main contact is retractably disposed in the first gas chamber along a first direction via an opening. The position of the moving contact is adjusted by moving the moving main contact relative to the first gas chamber, thereby adjusting the position of the moving contact relative to the stationary contact for performing closing or disconnecting actions. During the closing or disconnecting action, the moving arc contact moves synchronously with the moving main contact.

[0051] In the switching equipment of this application, during the tripping operation, the moving main contact first disengages from the stationary main contact, and the arc is borne by the stationary arc contact and the moving arc contact. Driven by the moving arc contact and the drive assembly, the air cylinder moves from a first position to a second position, so that the vent hole connects with the arc-extinguishing chamber. At the same time, the movement of the moving main contact relative to the first air chamber compresses the volume of the first air chamber, so that the arc-extinguishing gas in the first air chamber flows through the air cylinder and the vent hole on the air cylinder to the arc-extinguishing chamber and the exhaust port, so as to extinguish the arc generated between the stationary arc contact and the moving arc contact.

[0052] During the closing operation of the switchgear of this application, the gas cylinder is moved from the second position to the first position by the moving arc contact and the drive assembly. After the circuit is closed, the gas cylinder is placed in the first position to isolate the vent from the arc-extinguishing chamber. This isolation prevents the arc-extinguishing gas in the first gas chamber from continuing to flow into the arc-extinguishing chamber, thus maintaining most of the arc-extinguishing gas in the first gas chamber. This solves the problem that the stored arc-extinguishing gas is prone to continuous leakage and loss after the stationary and moving contacts are closed.

[0053] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0054] Reference Figures 1 to 10 As shown, it should be noted that X is the first direction, Y is the second direction, and Z is the third direction; among them, X, Y, and Z are three mutually perpendicular directions in space.

[0055] Reference Figure 1 As shown, the switching device of this application includes: a stationary contact 100 and an active switch 200.

[0056] The stationary contact 100 includes a stationary main contact 110 and a stationary arc contact 120, with the arc contact 120 located radially inside the stationary main contact 110. Exemplarily, the stationary main contact 110 includes a cylindrical base and multiple contact portions, all disposed within the inner cavity of the base and spaced circumferentially along the inner cavity. It is understood that the contact portions are used to conduct electricity with the moving main contact 221. Further, exemplaryly, the cylindrical base of the stationary main contact 110 can be fixedly connected to an insulating sleeve 700 to support and fix the stationary contact 100. It is understood that the stationary contact 100 is used to connect a circuit that is controlled to be switched on or off.

[0057] The movable switch 200 includes a cylinder 210, a moving contact 220, and an air cylinder 230. A certain distance is maintained between the cylinder 210 and the stationary contact 100. The cylinder 210 and the stationary contact 100 are connected by an insulating sleeve 700.

[0058] Reference Figure 1 and Figure 2 As shown, the cylinder body 210 defines a first gas chamber 211. The cylinder body 210 has an opening 212 at one end facing the stationary contact 100 along a first direction. The first gas chamber 211 is used to store arc-extinguishing gas.

[0059] The moving contact 220 includes a moving main contact 221 and a moving arc contact 222. It should be noted that the moving main contact 221 is used to control the on / off state of the controlled circuit by cooperating with the stationary main contact 110; the moving arc contact 222 is used to bear the electric arc during the tripping operation by cooperating with the stationary arc contact 120.

[0060] The moving main contact 221 is retractably disposed in the first air chamber 211 via the opening 212 along a first direction. Exemplarily, a seal is formed between the portion of the moving main contact 221 passing through the opening 212 and the opening 212. It is understood that the moving main contact 221 can be moved relative to the first air chamber 211 along the first direction to extend towards the direction of the stationary main contact 110; or to retract towards the first air chamber 211. The extension of the moving main contact 221 towards the direction of the stationary main contact 110 is used to perform a closing action, and the retraction of the moving main contact 221 towards the first air chamber 211 is used to perform a disconnecting action.

[0061] It should be noted that a seal is formed between the outer wall of the moving main contact 221 and the opening 212. This seal enables the moving main contact 221 to act as a "piston". That is, when the moving main contact 221 moves relative to the first air chamber 211 in the first direction, the moving main contact 221 can adjust the volume of the first air chamber 211.

[0062] Reference Figure 1 and Figure 3As shown, the moving main contact 221 has an arc-extinguishing chamber 221a on its inner side. The end of the moving main contact 221 facing the stationary contact 100 has an exhaust port 221b that communicates with the arc-extinguishing chamber 221a. The moving main contact 221 also includes a base plate 221c opposite to the exhaust port 221b. The base plate 221c has a movable hole 221d and a through hole 221e that extend along a first direction.

[0063] The moving arc contact 222 passes through the movable hole 221d along a first direction. It should be noted that the portion of the moving arc contact 222 passing through the movable hole 221d is fixedly connected to the portion passing through the movable hole 221d. A seal is formed between the moving arc contact 222 and the movable hole 221d, for example, through a weld. One end of the moving arc contact 222 extends into the arc-extinguishing chamber 221a, and this end has a contact portion. This contact portion of the moving arc contact 222 is used to cooperate with the stationary arc contact 120 to withstand the arc generated during the circuit breaker tripping process. The other end of the moving arc contact 222 extends into the first gas chamber 211; the portion of the moving arc contact 222 extending into the first gas chamber 211 is referred to as the mounting portion 222a.

[0064] For example, a drive rod 800 can be fixed on the mounting part 222a. The drive rod 800 extends out of the cylinder body 210 and is used to connect an external driver, such as a hydraulic cylinder, for driving the closing and closing of the circuit.

[0065] The gas cylinder 230 is movably inserted through the through hole 221e along a first direction. The inner side of the gas cylinder 230 is hollow, which provides a flow channel for the arc-extinguishing gas. The end of the gas cylinder 230 facing the first gas chamber 211 is open, and the gas cylinder 230 is provided with a vent hole 230a. It should be noted that the vent hole 230a is connected to the open end of the gas cylinder 230 facing the first gas chamber 211 through the hollow inner structure of the gas cylinder 230.

[0066] Reference Figure 1 and Figure 4 As shown, the drive assembly 240 is connected to the moving arc contact 222 and the air cylinder 230 respectively. The drive assembly 240 is adapted to drive the air cylinder 230 to move between a first position and a second position under the drive of the moving arc contact 222. In the first position, the vent 230a is isolated from the arc-extinguishing chamber 221a, and in the second position, the vent 230a is connected to the arc-extinguishing chamber 221a.

[0067] For example, refer to Figure 3 and Figure 6As shown, the drive assembly 240 can be configured by setting an active rack 245, an intermediate gear 246, and a driven rack 247. When the drive assembly 240 is configured by setting an active rack 245, an intermediate gear 246, and a driven rack 247, the outer contour of the cross-section of the air cylinder 230 (parallel to the YZ plane) is polygonal (e.g., square); the cross-sectional contour of the through hole 221e matches the outer contour of the cross-section of the air cylinder 230, so as to guide the movement of the air cylinder 230 through the cooperation of the through hole 221e and the air cylinder 230. The intermediate gear 246 is rotatably connected in the cylinder body 210, the active rack 245 and the driven rack 247 are parallel to each other, the active rack 245 is located on one radial side of the intermediate gear 246, and the driven rack 247 is located on the other radial side of the intermediate gear 246. The active rack 245 is fixed on the mounting part 222a, and the driven rack 247 is fixed on the air cylinder 230.

[0068] Reference Figures 1 to 6 As shown, the switching device of this application defines a first gas chamber 211 by a cylinder 210, which stores arc-extinguishing gas. The moving main contact 221 is retractably disposed in the first gas chamber 211 along a first direction via an opening 212. The position of the moving contact 220 is adjusted by moving the moving main contact 221 relative to the first gas chamber 211, thereby adjusting the position of the moving contact 220 relative to the stationary contact 100 for performing closing or disconnecting operations. During the closing or disconnecting operation, the moving arc contact 222 moves synchronously with the moving main contact 221.

[0069] In the switching equipment of this application, during the tripping operation, the moving main contact 221 first disengages from the stationary main contact 110, and the arc is borne by the stationary arc contact 120 and the moving arc contact 222. Driven by the moving arc contact 222 and the drive assembly 240, the air cylinder 230 moves from the first position to the second position, so that the vent 230a connects with the arc-extinguishing chamber 221a. At the same time, the movement of the moving main contact 221 relative to the first air chamber 211 compresses the volume of the first air chamber 211, so that the arc-extinguishing gas in the first air chamber 211 flows through the air cylinder 230 and the vent 230a on the air cylinder to the arc-extinguishing chamber 221a and the exhaust port 221b, so as to extinguish the arc generated between the stationary arc contact 120 and the moving arc contact 222.

[0070] During the closing operation of the switchgear of this application, the moving arc contact 222 and the drive assembly 240 move the gas cylinder 230 from the second position to the first position. After the switch is closed, the gas cylinder 230 is placed in the first position to isolate the vent 230a from the arc-extinguishing chamber 221a. This isolation prevents the arc-extinguishing gas in the first gas chamber 211 from continuing to flow into the arc-extinguishing chamber 221a, thus maintaining most of the arc-extinguishing gas in the first gas chamber 211. This solves the problem that the stored arc-extinguishing gas is prone to continuous leakage and loss after the stationary contact 100 and the moving contact 220 are closed.

[0071] Reference Figure 1 Figure 3 and Figure 4 As shown, in some embodiments, a vent 230a is located at the end of the side wall of the gas cylinder 230 near the arc-extinguishing chamber 221a. In the first position, the vent 230a is within the through hole 221e, and the vent 230a is sealed by the wall of the through hole 221e; it is understood that the sealing of the vent 230a by the wall of the through hole 221e serves to isolate the vent 230a from the arc-extinguishing chamber 221a. In the second position, the vent 230a is within the arc-extinguishing chamber 221a; it is understood that at this time, the vent 230a is connected to the arc-extinguishing chamber 221a, allowing the arc-extinguishing gas to flow into the arc-extinguishing chamber 221a through the gas cylinder 230. It should be noted that the switchgear of this application isolates the vent 230a from the arc-extinguishing chamber 221a by the cooperation of the walls of the vent 230a and the through hole 221e, thereby preventing continuous leakage of arc-extinguishing gas when the switch is closed without the use of a valve.

[0072] Reference Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the drive assembly 240 includes a rack 241, a gear 242, a first bevel gear 243, and the rack 241. This drive assembly 240 can simultaneously drive the air cylinder 230 to switch between a first position and a second position while the switchgear of this application performs closing or opening actions.

[0073] The rack 241 is fixed to the side wall of the mounting portion 222a and extends along a first direction. The gear component 242 includes a gear shaft 242a and a gear portion 242b, which are fixedly connected to each other. The gear shaft 242a is rotatably mounted inside the cylinder body 210, meaning that the gear shaft 242a can rotate within the cylinder body 210; for example, the cylinder body 210 may be provided with a bearing housing, and a bearing may be provided on the bearing housing to rotatably connect the gear shaft 242a via the bearing. The gear shaft 242a extends along a second direction, and the gear portion 242b meshes with the rack 241; the second direction is perpendicular to the first direction.

[0074] A first bevel gear 243 is sleeved on a gear shaft 242a, and the first bevel gear 243 and the gear shaft 242a are fixedly connected. A second bevel gear 244 is sleeved on an air cylinder 230. For example, the air cylinder 230 and the second bevel gear 244 can be connected by a thread, so that the air cylinder 230 is driven to move by the rotation of the second bevel gear 244 relative to the air cylinder 230, so that the air cylinder 230 can move between a first position and a second position. The second bevel gear 244 meshes with the first bevel gear 243. When the air cylinder 230 and the second bevel gear 244 are connected by a thread, the outer contour of the portion of the air cylinder 230 passing through the through hole 221e is polygonal to prevent the air cylinder 230 from rotating in the through hole 221e. The second bevel gear 244 can have a downward tendency under its own weight and the weight of the air cylinder 230 to maintain meshing with the first bevel gear 243.

[0075] Reference Figure 1 , Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, in some embodiments, the moving component 240 includes a rack 241, a gear 242, a first bevel gear 243, and the rack 241.

[0076] The rack 241 is fixed to the side wall of the mounting portion 222a and extends along a first direction. The gear component 242 includes a gear shaft 242a and a gear portion 242b, which are fixedly connected to each other. The gear shaft 242a is rotatably mounted inside the cylinder body 210, meaning that the gear shaft 242a can rotate within the cylinder body 210. The gear shaft 242a extends along a second direction, and the gear portion 242b meshes with the rack 241; the second direction is perpendicular to the first direction.

[0077] The first bevel gear 243 is sleeved on the gear shaft 242a, and the first bevel gear 243 and the gear shaft 242a are fixedly connected.

[0078] The second bevel gear 244 is sleeved on the air cylinder 230, and the second bevel gear 244 and the air cylinder 230 are fixedly connected. The second bevel gear 244 meshes with the first bevel gear 243. The inner wall of the through hole 221e is provided with an internal thread, and the outer wall of the air cylinder 230 is provided with an external thread. The air cylinder 230 is threadedly engaged with the base plate 221c. It should be noted that the air cylinder 230 in this embodiment includes a first cylinder section 231 and a second cylinder section 232. The vent hole 230a is located near the first end of the first cylinder section 231. The external thread of the air cylinder 230 for threaded engagement with the base plate 221c is located at the first end of the first cylinder section 231. The first end of the second cylinder section 232 is sleeved in the first cylinder section 231 through the second end of the first cylinder section 231. The first end of the second cylindrical section 232 has a plurality of guide blocks 232a spaced circumferentially thereon. The first cylindrical section 231 has a guide groove for cooperating with the guide blocks 232a to guide the guide blocks 232a. The guide groove extends axially along the first cylindrical section 231. A second bevel gear 244 is sleeved on the first cylindrical section 231 and fixed to it. It can be understood that by setting the first cylindrical section 231, the second cylindrical section 232, the guide blocks 232a and the guide groove, the air cylinder 230 only has the ability to transmit torque, but does not have the function of transmitting axial force.

[0079] Understandably, in this embodiment, when the mounting part 222a moves with the follower contact 220, the mounting part 222a drives the rack 241 to move, so that the rack 241 drives the gear part 242b to rotate, so that the gear part 242b drives the gear shaft 242a to rotate, so that the gear shaft 242a drives the first bevel gear 243 to rotate, so that the first bevel gear 243 drives the second bevel gear 244 to rotate, so that the second bevel gear 244 drives the first cylinder section 231 to rotate, so that the first cylinder section 231 drives the second cylinder section 232 to rotate, so that the second cylinder section 232 moves through the threaded engagement between the second cylinder section 232 and the base plate 221c; so that the air cylinder 230 switches between the first position and the second position through this movement.

[0080] Understandably, in this embodiment, on the one hand, a stable and timely linkage effect is formed between the mounting part 222a and the air cylinder 230. On the other hand, through the threaded engagement between the air cylinder 230 and the base plate 221c, after the circuit is closed, it is beneficial to maintain the sealing between the side wall of the air cylinder 230 and the through hole 221e, avoid leakage of arc-extinguishing gas, and achieve a good sealing effect.

[0081] Reference Figure 1 , Figure 2 , Figure 9 and Figure 10As shown, in some embodiments, a support plate 211a is provided inside the first air chamber 211. The support plate 211a is fixed to the cylinder body 210. For example, the support plate 211a and the cylinder body 210 can be welded together; or, the support plate 211a and the cylinder body 210 are an integral cast structure. The support plate 211a is provided with a shaft hole 211b, and the air cylinder 230 also passes through the shaft hole 211b.

[0082] The active switch 200 also includes a bearing 250, which is sleeved on the outside of the air cylinder 230 and located within the shaft hole 211b. For example, the bearing 250 includes an inner ring and an outer ring, with the outer ring fixed within the shaft hole 211b, and the air cylinder 230 sleeved within the inner ring of the bearing 250. It is understood that the support plate 211a, the shaft hole 211b, and the bearing 250 facilitate maintaining the orientation stability of the air cylinder 230 and also allow for smooth rotation of the air cylinder 230.

[0083] In addition, a second channel 211d can be provided in the support plate 211a, the second channel 211d being used for the passage of the moving arc contact 222.

[0084] Reference Figure 1 As shown, a second gas chamber 213 is also provided inside the cylinder body 210, and the first gas chamber 211 and the second gas chamber 213 are separated by a partition 214. The second gas chamber 213 is in continuous communication with the first gas chamber 211, and the second gas chamber 213 is used to replenish gas to the first gas chamber 211. It should be noted that the second gas chamber 213 is used to store spare arc-extinguishing gas. It can be understood that when the arc-extinguishing gas in the first gas chamber 211 is insufficient, arc-extinguishing gas can be replenished to the first gas chamber 211 through the second gas chamber 213.

[0085] Reference Figure 1 and Figure 2As shown, the switchgear also includes a sleeve 300. The sleeve 300 is disposed within the second gas chamber 213 and defines a third gas chamber 215. It is understood that defining the third gas chamber 215 by the sleeve 300 helps improve the space utilization rate inside the cylinder body 210, that is, minimizing the volume of the solid portion used to define the third gas chamber 215 to maintain the internal volume of the cylinder body 210. For example, the sleeve 300 can be fixed in the cylinder body 210 by a partition 214. The sleeve 300 is provided with a gas supply hole 310. The gas supply hole 310 is in a switchable manner connected to both the first gas chamber 211 and the second gas chamber 213, so that the second gas chamber 213 supplies gas to the first gas chamber 211 through the third gas chamber 215. It is understood that the third gas chamber 215 is used to transfer and buffer the arc-extinguishing gas. For example, pipelines can be respectively provided between the air supply port 310 and the first air chamber 211, and between the air supply port 310 and the second air chamber 213, with valves installed on the pipelines to control the opening and closing of the corresponding pipelines. It can be understood that by connecting the air supply port 310 to the first air chamber 211 and the second air chamber 213 in a way that can be opened and closed, the air supply action can be controlled.

[0086] Reference Figure 1 and Figure 2 As shown, in some embodiments, the partition 214 has a piston hole 214a, and one end of the sleeve 300 has a movable opening 320, which is opposite to and communicates with the piston hole 214a. The periphery of the movable opening 320 is sealed to the partition 214. For example, the periphery of the movable opening 320 is welded to the partition 214 to achieve a seal through the weld. Alternatively, for example, the sleeve 300 and the partition 214 are integrally formed (e.g., cast), and the periphery of the movable opening 320 is sealed to the partition 214 through the integrally formed structure. Alternatively, the sleeve 300 and the partition 214 can be connected by a flange, and the periphery of the movable opening 320 is sealed to the partition 214 through a sealing ring disposed between the flanges.

[0087] The moving contact 220 also includes a piston rod 223, which is connected to the base plate 221c of the moving arc contact 222. The piston rod 223 passes through the piston hole 214a into the third gas chamber 215. When the piston rod 223 moves with the moving arc contact 222 to compress the third gas chamber 215, the gas in the third gas chamber 215 flows towards the first gas chamber 211, thereby pressurizing the arc-extinguishing gas buffered in the third gas chamber 215 towards the first gas chamber 211 to replenish the arc-extinguishing gas in the first gas chamber 211. It should be noted that the process of the piston rod 223 moving with the moving arc contact 222 to compress the third gas chamber 215 is the process of performing the circuit breaker action in this application. This application can simultaneously replenish the arc-extinguishing gas in the first gas chamber 211 during the circuit breaker action to maintain the arc-extinguishing gas in the first gas chamber 211 at a high pressure, which facilitates the improvement of the arc-extinguishing effect during the circuit breaker operation.

[0088] When the piston rod 223 moves with the moving arc contact 222 to expand the third gas chamber 215, the gas in the second gas chamber 213 flows into the third gas chamber 215 to replenish the buffered arc-extinguishing gas in the third gas chamber 215. It should be noted that the expansion of the third gas chamber 215 by the movement of the piston rod 223 with the moving arc contact 222 is the closing operation process of this application. It is understood that during the closing operation, this application can simultaneously replenish the buffered arc-extinguishing gas in the third gas chamber 215 for use in the next tripping operation.

[0089] Reference Figure 1 , Figure 2 and Figure 11 As shown, the partition 214 is also provided with an outlet hole 214b extending along a first direction. The switchgear of this application also includes a connection assembly 400. The connection assembly 400 includes: a first pipeline 410, a first one-way valve 420, a second pipeline 430, and a second one-way valve 440. The inlet end of the first pipeline 410 is connected to the outlet hole 214b, and the outlet end is connected to the replenishment hole 310. The first one-way valve 420 is disposed on the first pipeline 410, and the first one-way valve 420 is used to allow gas to flow unidirectionally from the third gas chamber 215 to the first gas chamber 211. The outlet end of the second pipeline 430 is connected to the first pipeline 410, and, exemplarily, this connection can be made by a tee connector. The connection position between the outlet end of the second pipeline 430 and the first pipeline 410 is located upstream of the first one-way valve 420, and the inlet end of the second pipeline 430 is connected to the second gas chamber 213. The second check valve 440 is provided on the second pipeline 430, and the first check valve 420 is used to allow gas to flow unidirectionally from the second gas chamber 213 to the first gas chamber 211.

[0090] Understandably, when the piston rod 223 moves with the moving arc contact 222 to compress the third chamber 215, the first one-way valve 420 is in the open state and the second one-way valve 440 is in the closed state, so that the gas in the third chamber 215 can flow smoothly to the first chamber 211. When the piston rod 223 moves with the moving arc contact 222 to expand the third chamber 215, the first one-way valve 420 is in the closed state and the second one-way valve 440 is in the open state, so that the third chamber 215 can be replenished with arc-extinguishing gas from the second chamber 213.

[0091] It is understood that the number of the aforementioned connecting components 400 can be one set or multiple sets. It is understood that the number of air outlets 214b corresponds to the number of connecting components 400; the number of air inlet ports 310 corresponds to the number of connecting components 400.

[0092] In addition, in some embodiments, an electrically controlled valve may be used to replace the first check valve 420, and another electrically controlled valve may be used to replace the second check valve 440.

[0093] Reference Figure 1 As shown, in some embodiments, the connecting assembly 400 further includes a transition container 450 disposed on the first pipeline 410 between the first one-way valve 420 and the outlet port 214b. The transition container 450 is used to temporarily store the gas. It is understood that the switching device of this application, by providing the transition container 450, can be used to buffer arc-extinguishing gas.

[0094] Reference Figure 1 and Figure 11 As shown, in some embodiments, the inner wall of the vent 214b is provided with a switch groove 214c. The switching device of this application also includes a switch element 500 and a gas replenishment triggering mechanism 600. The switch element 500 is movably disposed in the switch groove 214c to open or close the vent 214b; the gas replenishment triggering mechanism 600 is drively connected to the arc-extinguishing contact 222 and is separably coupled to the switch element 500 to drive the switch element 500 to move. It can be understood that the process of controlling the gas replenishment action through the switch element 500 and the gas replenishment triggering mechanism 600 ensures the quality of arc extinguishing while replenishing the arc-extinguishing gas.

[0095] Reference Figure 1 , Figure 11 and Figure 12 As shown, in some embodiments, a magnetic element 214d is provided in the switch slot 214c, and the switch element 500 is a magnetic attracting element; it should be noted that the magnetic element 214d and the magnetic attracting element are two components that can attract each other through a magnetic field. For example, the magnetic element 214d can be a permanent magnet, and the switch element 500 can be an iron component. The gas replenishment trigger mechanism 600 includes: a mounting plate 610, a movable plate 620, a trigger rod 630, and an elastic element 640.

[0096] Mounting plate 610 is fixedly sleeved on the outside of piston rod 223. Mounting plate 610 is located inside first air chamber 211 and has guide hole 611. Movable plate 620 is movably disposed on the side of mounting plate 610 facing away from second air chamber 213.

[0097] A trigger rod 630 passes through a guide hole 611, allowing it to move relative to the mounting plate 610. The first end of the trigger rod 630 is fixedly connected to a movable plate 620, enabling synchronous movement between the first end of the trigger rod 630 and the movable plate 620. The second end of the trigger rod 630 is provided with a magnetic attraction component 631, which, exemplarily, can be a permanent magnet. The attraction force between the magnetic attraction component 631 and the magnetic element is greater than the attraction force between the magnetic element and the magnetic element 214d. The trigger rod 630 is positioned opposite to the switch slot 214c.

[0098] One end of the elastic element 640 is fixedly connected to the mounting plate 610, and the other end is fixedly connected to the movable plate 620; for example, the elastic element 640 can be a compression spring. The moving arc contact 222 is adapted to drive the trigger rod 630 to move sequentially through the mounting plate 610, the elastic element 640, and the movable plate 620, so that the magnetic attraction component 631 magnetically engages or disengages from the magnetic attraction component. When the magnetic attraction component 631 magnetically engages with the magnetic attraction component, the vent hole 214b is closed. When the magnetic attraction component 631 disengages from the magnetic attraction component, the magnetic element 214d magnetically engages with the magnetic attraction component, and the vent hole 214b is opened.

[0099] It should be noted that during the tripping operation of the switchgear in this application, the tripping process can be divided into a first stage and a second stage according to the movement range of the moving arc contact 222. In both the first and second stages, the piston rod 223 compresses the volume of the third gas chamber 215. In the first stage, the magnetic attraction component 631 separates from the magnetic attraction component, the vent 214b opens, and the compression of the third gas chamber 215 by the piston rod 223 promotes the flow of the arc-extinguishing gas in the third gas chamber 215 to the first gas chamber 211 and the arc-extinguishing chamber 221a, thereby improving the arc-extinguishing effect. In the second stage, the magnetic attraction component 631 reaches a position where it can magnetically engage with the magnetic attraction component, and the magnetic attraction component moves to a position that closes the vent 214b. In this stage, the arc-extinguishing gas in the third gas chamber 215 is compressed and sent to the transition container 450 for storage.

[0100] It should be noted that the closing process of the switchgear in this application includes a first stage and a second stage. In both the first and second stages, the piston rod 223 expands the volume of the third gas chamber 215. In the first stage, the magnetic attraction component 631 is in a position where it magnetically engages with the magnetic attraction component, and the magnetic attraction component is in a position where the outlet 214b is closed. At this time, the first one-way valve 420 is closed, the second one-way valve 440 is open, and the arc-extinguishing gas flows into the third gas chamber 215 through the second pipeline 430 to replenish the third gas chamber 215 with arc-extinguishing gas. In the second stage, the magnetic attraction component 631 separates from the magnetic attraction component, and the arc-extinguishing gas compressed in the transition container 450 flows through the outlet 214b to the first gas chamber 211 to replenish the first gas chamber 211 with some arc-extinguishing gas, in order to quickly respond to the arc-extinguishing action when the circuit is switched off again.

[0101] It should be noted that the number of the aforementioned air replenishment triggering mechanisms 600 corresponds to the number of the connecting components 400.

[0102] For example, refer to Figure 1 and Figure 9 As shown, when a support plate 211a is provided in the first air chamber 211, a first channel 211c can be provided on the support plate 211a to provide a channel for the trigger rod 630 and the movable plate 620 to move through the first channel 211c.

[0103] Reference Figure 1 and Figure 11 As shown, the partition 214 also has a clearance hole 214e, which penetrates the side wall of the switch slot 214c facing the first air chamber 211 and communicates with the switch slot 214c. The trigger rod 630 can be inserted into the clearance hole 214e to magnetically engage the magnetic coupling component 631 with the magnetic component. It can be understood that providing the clearance hole 214e helps to improve the magnetic engagement effect between the magnetic coupling component 631 and the magnetic component.

[0104] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A switching device, characterized in that, include: The stationary contact (100) includes a stationary main contact (110) and a stationary arc contact (120), wherein the stationary arc contact (120) is located radially inside the stationary main contact (110); Active switch (200), including: The cylinder body (210) defines a first gas chamber (211), and the cylinder body (210) has an opening (212) at one end facing the stationary contact (100) in a first direction. The first gas chamber (211) is used to store arc-extinguishing gas. The moving contact (220) includes: The moving main contact (221) is telescopically disposed in the first gas chamber (211) along the first direction via the opening (212). An arc-extinguishing chamber (221a) is provided on the inner side of the moving main contact (221). The end of the moving main contact (221) facing the stationary contact (100) has an exhaust port (221b) communicating with the arc-extinguishing chamber (221a). The moving main contact (221) also includes a base plate (221c) opposite to the exhaust port (221b). The base plate (221c) is provided with a movable hole (221d) and a through hole (221e) that penetrate along the first direction. A moving arc contact (222) is provided in the movable hole (221d) along the first direction. One end of the moving arc contact (222) extends into the arc-extinguishing chamber (221a), and the other end extends into the first gas chamber (211). An air cylinder (230) is movably inserted through the through hole (221e) in a first direction. The inner side of the air cylinder (230) is hollow. The end of the air cylinder (230) facing the first air chamber (211) is open. The air cylinder (230) is provided with a vent hole (230a). A drive assembly (240) is connected to the moving arc contact (222) and the air cylinder (230) respectively. The drive assembly (240) is adapted to drive the air cylinder (230) to move between a first position and a second position under the drive of the moving arc contact (222). In the first position, the vent (230a) is isolated from the arc-extinguishing chamber (221a). In the second position, the vent (230a) is connected to the arc-extinguishing chamber (221a).

2. The switching device according to claim 1, characterized in that, The vent (230a) is located on the side wall of the air cylinder (230) near the end of the arc-extinguishing chamber (221a). In the first position, the vent (230a) is located inside the through hole (221e) and is closed by the hole wall of the through hole (221e). In the second position, the vent (230a) is located inside the arc-extinguishing chamber (221a).

3. The switching device according to claim 2, characterized in that, The moving arc contact (222) has a mounting portion (222a) extending into the first air chamber (211), and the drive assembly (240) includes: A rack (241) is fixed to the side wall of the mounting part (222a) and extends along the first direction; The gear component (242) includes a gear shaft (242a) and a gear portion (242b), the gear shaft (242a) being rotatably mounted in the cylinder (210) and extending along a second direction, the gear portion (242b) meshing with the rack (241), the second direction being perpendicular to the first direction; The first bevel gear (243) is sleeved on the gear shaft (242a). The second bevel gear (244) is sleeved on the air cylinder (230), and the second bevel gear (244) meshes with the first bevel gear (243).

4. The switching device according to claim 3, characterized in that, The inner wall of the through hole (221e) is provided with an internal thread, the outer wall of the air cylinder (230) is provided with an external thread, and the air cylinder (230) is threadedly engaged with the base plate (221c).

5. The switching device according to claim 1, characterized in that, The cylinder block (210) is further provided with a second air chamber (213), and the first air chamber (211) and the second air chamber (213) are separated by a partition (214). The second air chamber (213) is in continuous communication with the first air chamber (211), and the second air chamber (213) is used to replenish the first air chamber (211) with air.

6. The switching device according to claim 5, characterized in that, The switching device further includes: A sleeve (300) is disposed in the second air chamber (213) and defines a third air chamber (215). The sleeve (300) is provided with an air supply hole (310), which is connected to the first air chamber (211) and the second air chamber (213) respectively, so that the second air chamber (213) supplies air to the first air chamber (211) through the third air chamber (215).

7. The switching device according to claim 6, characterized in that, The partition (214) is provided with a piston hole (214a), and one end of the sleeve (300) is provided with a movable port (320). The movable port (320) is opposite to and communicates with the piston hole (214a), and the periphery of the movable port (320) is sealed to the partition (214). The moving contact (220) also includes a piston rod (223), which is connected to the base plate (221c) of the moving arc contact (222). The piston rod (223) passes through the piston hole (214a) into the third gas chamber (215). When the piston rod (223) moves with the moving arc contact (222) to compress the third gas chamber (215), the gas in the third gas chamber (215) flows into the first gas chamber (211). When the piston rod (223) moves with the moving arc contact (222) to expand the third gas chamber (215), the gas in the second gas chamber (213) flows into the third gas chamber (215).

8. The switching device according to claim 7, characterized in that, The partition (214) is also provided with an air outlet (214b) that runs through the first direction. The switching device further includes a connection assembly (400), the connection assembly (400) comprising: The first pipeline (410) has its outlet end connected to the air outlet (214b) and its inlet end connected to the air supply port (310). A first check valve (420) is provided on the first pipeline (410). The first check valve (420) is used to allow gas to flow unidirectionally from the third gas chamber (215) to the first gas chamber (211). The second pipeline (430) has its outlet end connected to the first pipeline (410) and located upstream of the first check valve (420). The inlet end of the second pipeline (430) is connected to the second air chamber (213). The second check valve (440) is provided on the second pipeline (430), and the first check valve (420) is used to allow gas to flow unidirectionally from the second gas chamber (213) to the first gas chamber (211).

9. The switching device according to claim 8, characterized in that, The connection component (400) further includes: A transition container (450) is disposed on a first pipeline (410) between the first one-way valve (420) and the gas outlet (214b), and the transition container (450) is used to temporarily store gas.

10. The switching device according to claim 8, characterized in that, The inner wall of the vent (214b) is provided with a switch groove (214c), and the switch device further includes: A switch element (500) is movably disposed within the switch slot (214c) to open or close the vent (214b). A gas replenishment trigger mechanism (600) is connected to the moving arc contact (222) and can be separably coupled with the switch (500) to drive the switch (500) to move.

11. The switching device according to claim 10, characterized in that, The switch slot (214c) is provided with a magnetic component (214d), and the switch component (500) is a magnetic attraction component; The air replenishment trigger mechanism (600) includes: Mounting plate (610) is fixedly sleeved on the outside of piston rod (223) and located in the first air chamber (211). Mounting plate (610) is provided with guide hole (611). A movable plate (620) is movably disposed on the side of the mounting plate (610) facing away from the second air chamber (213); A trigger rod (630) is inserted through the guide hole (611). The first end of the trigger rod (630) is fixedly connected to the movable plate (620). The second end of the trigger rod (630) is provided with a magnetic attraction component (631). The attraction between the magnetic attraction component (631) and the magnetic component is greater than the attraction between the magnetic component and the magnetic component (214d). The trigger rod (630) is arranged opposite to the switch slot (214c). An elastic element (640) is fixedly connected at one end to the mounting plate (610) and at the other end to the movable plate (620); The moving arc contact (222) is adapted to drive the trigger rod (630) to move sequentially via the mounting plate (610), the elastic member (640), and the movable plate (620), so that the magnetic attraction member (631) magnetically engages or disengages with the magnetic attraction member. When the magnetic attraction component (631) is magnetically attracted to the magnetic attraction component, the air outlet (214b) is closed. When the magnetic attraction component (631) is separated from the magnetic attraction component, the magnetic component (214d) magnetically engages with the magnetic attraction component, and the air outlet (214b) opens.

12. The switching device according to claim 11, characterized in that, The partition (214) is also provided with a clearance hole (214e), which penetrates the side wall of the switch groove (214c) facing the first air chamber (211) and communicates with the switch groove (214c). The trigger rod (630) can be inserted into the clearance hole (214e) so that the magnetic attraction component (631) and the magnetic attraction component are magnetically attracted to each other.

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