A switching device and power converter

Abstract

The application provides a switch device and a power converter, and relates to the technical field of electrical equipment. The switch device comprises an insulating base, a first contact assembly, a second contact and an arc extinguishing chamber. The first contact assembly is arranged in a first groove of the insulating base and is rotationally connected. The first contact assembly comprises an insulating rotating disc and a first contact arranged on the insulating rotating disc. The second contact is arranged on the insulating base and is rotationally connected. The first contact rotates with the insulating rotating disc to close or open the second contact. The groove wall of the first groove corresponding to the rotation angle of the first contact in the opening stroke is an arc extinguishing section. In the opening rotation direction of the first contact, the first gap between the outer circumferential surface of the body of the insulating rotating disc and the arc extinguishing section gradually decreases, and the arc-shaped protruding part of the rotating insulating rotating disc pushes the second contact to rotate in the direction away from the insulating rotating disc. The arc extinguishing chamber is arranged on the insulating base and is in communication with the first gap. In this way, the arc extinguishing can be completed by using the first gap and the arc extinguishing chamber.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more particularly to a switching device and a power converter. Background Technology

[0002] In related technologies, with the widespread application of new energy power generation systems such as solar photovoltaic, DC switches, as key protection devices, are of paramount importance in terms of performance and reliability. When a circuit experiences a short circuit or other fault, the DC switch needs to quickly and safely interrupt the fault current. However, an electric arc is usually generated when the DC switch is disconnected. An electric arc is a high-temperature, highly conductive plasma that continues to burn, eroding the switch contacts and potentially causing equipment damage or safety accidents. Currently, in high-voltage applications, such as 2000V applications, complex arc-extinguishing chamber structures and numerous arc-extinguishing grids are often used to achieve sufficient arc-extinguishing capability. This significantly increases the size and weight of the switch, not only occupying equipment space and reducing the system's power density but also increasing material costs. Summary of the Invention

[0003] The purpose of this application is to provide a switching device and a power converter that optimizes the arc extinguishing structure and reduces the size and weight of the switching device.

[0004] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides a switching device, which includes an insulating base, a first contact assembly, a second contact, and an arc-extinguishing chamber. The insulating base has a first groove. The first contact assembly is disposed in the first groove and rotatably connected to the insulating base. The first contact assembly includes an insulating turntable and a first contact disposed on the insulating turntable. The second contact is disposed on the insulating base and rotatably connected to the insulating base. The first contact rotates with the insulating turntable and engages with the second contact to close or open the circuit. The insulating turntable includes a body and an arc-shaped protrusion protruding from the outer peripheral surface of the body. The groove wall of the first groove corresponding to the rotation angle of the first contact during the opening stroke is an arc-extinguishing segment. In the opening rotation direction of the first contact, the first gap between the outer peripheral surface of the body and the arc-extinguishing segment gradually decreases. In the opening rotation direction of the first contact, the rotating arc-shaped protrusion pushes the second contact to rotate away from the insulating turntable. The arc-extinguishing chamber is disposed on the insulating base and communicates with the first gap.

[0005] Because there is a first gap between the outer peripheral surface of the body and the arc-extinguishing section, and this first gap gradually decreases in the opening rotation direction of the first contact, the first gap can achieve slit arc extinguishing during the opening stroke. The arc extinguishing process can be understood as follows: when opening, an electric arc is formed between the first contact and the second contact, and during the opening stroke of the first contact, the electric arc between the first contact and the second contact will be elongated. That is, when the insulating turntable rotates along the opening direction, it drives the first contact to rotate, so that the electric arc at the first contact is pulled from a wider gap into a narrower gap. The electric arc will be compressed and thinned by the constraint of the wall of the first gap. That is, the electric arc is squeezed by the slit, thereby cooling rapidly and gradually extinguishing, thus achieving slit arc extinguishing.

[0006] Meanwhile, the outer circumferential surface of the insulating turntable is also provided with an arc-shaped protrusion. In the opening rotation direction of the first contact, the rotating arc-shaped protrusion pushes the second contact to rotate away from the insulating turntable. In this way, the arc between the first contact and the second contact can be further lengthened, so that the energy of the arc can be further attenuated, which helps to extinguish the arc.

[0007] In addition, the insulating base is provided with an arc-extinguishing chamber that communicates with the first gap, so that the arc can enter the arc-extinguishing chamber through the first gap and be extinguished by the arc-extinguishing chamber. That is, the switching device provided by this application has both slit arc extinguishing and arc-extinguishing chamber arc extinguishing. The two arc extinguishing methods can be combined to achieve complete arc extinguishing. For example, in some high-voltage application scenarios, it is not necessary to increase the arc extinguishing chamber space to improve the arc extinguishing capability. This application can achieve complete arc extinguishing.

[0008] In summary, the switching device provided in this application extinguishes the arc through a slit by using a first gap, thus consuming the energy of the arc. This means that the energy of the arc entering the arc-extinguishing chamber is only a portion of the total energy of the arc. Compared to the case where all the energy of the arc is consumed through the arc-extinguishing chamber, the arc-extinguishing chamber of the switching device in this application is only responsible for consuming a portion of the arc energy. This reduces the number of arc-extinguishing structures (such as arc-extinguishing grids) required within the arc-extinguishing chamber, resulting in a smaller overall size of the arc-extinguishing chamber. This helps to reduce the overall volume and weight of the switching device. Furthermore, the reduced number of arc-extinguishing structures (such as arc-extinguishing grids) also lowers the manufacturing cost of the switching device.

[0009] In conjunction with the first aspect, in some feasible ways, the length of the arc-shaped protrusion in the radial direction of the insulating turntable gradually increases in the opening rotation direction of the first contact.

[0010] During the opening stroke of the first contact, the arc-shaped protrusion pushes the second contact gradually away from the body, increasing the distance between the second contact and the body. This further distances the first and second contacts from each other, lengthening the arc between them. The lengthened arc can dissipate some of its energy, thus further reducing the arc-extinguishing load on the arc-extinguishing chamber and the first gap, thereby improving overall arc-extinguishing stability. Furthermore, the continuous movement of the second contact away from the insulating turntable also keeps the arc on the second contact away from the insulating turntable, preventing the arc from continuously burning the insulating turntable. This effectively prevents the insulating turntable from carbonizing or even breaking down due to arc burning, thus helping to extend the overall service life of the switchgear.

[0011] In conjunction with the first aspect, in some feasible ways, in the depth direction of the first groove, the arcuate protrusion is close to the bottom of the first groove, and the first gap is located above the arcuate protrusion.

[0012] This maximizes the height of the arc-shaped protrusion in the depth direction of the first groove, and maximizes the space enclosed by the arc-shaped protrusion, the arc-extinguishing section, and the outer peripheral surface of the body. This reduces the possibility of the electric arc between the first and second contacts coming into contact with the arc-shaped protrusion, the wall of the first groove, and the outer peripheral surface of the body. This helps reduce the carbonization or even breakdown damage of the insulating turntable due to arc burning, and can further extend the service life of the switching device.

[0013] In conjunction with the first aspect, in some feasible ways, the outer peripheral surface of the body is provided with a first protrusion. In the opening rotation direction of the first contact, the first protrusion is located at the end of the arc-shaped protrusion. The first protrusion, together with the arc-extinguishing section, the outer peripheral surface of the body, and the arc-shaped protrusion, forms an accommodating space. The accommodating space is connected to the arc-extinguishing chamber, and the first gap is located in the accommodating space.

[0014] Because the first gap between the outer peripheral surface of the body and the arc-extinguishing section gradually decreases in the opening rotation direction of the first contact, and the first protrusion is located at the end of the arc-shaped protrusion, the accommodating space formed by the first protrusion, the arc-extinguishing section, the outer peripheral surface of the body, and the arc-shaped protrusion is almost closed in the opening rotation direction of the first contact. This reduces the risk that the electric arc between the first contact and the second contact will extend to other parts after touching the groove wall of the first groove, thereby reducing the area of ​​the insulating base, insulating turntable, etc. that will be burned, and further improving the service life of the switching device.

[0015] In conjunction with the first aspect, in some feasible embodiments, the switching device further includes an arc-inducing plate, an insulating base having a second groove communicating with the first gap and the arc-extinguishing chamber, the arc-inducing plate being disposed within the second groove, and a second gap being present between the arc-inducing plate and the groove wall of the second groove.

[0016] In this way, the arc generated by the breaking of the first and second contacts during the opening of the insulating turntable can be guided to the second groove by the arc-inducing plate. This allows the arc to enter the second groove more smoothly and quickly from the first groove, which can greatly improve the efficiency of the arc entering the second groove and reduce the situation of the arc lingering and accumulating in the first groove. This helps to further reduce the risk of the insulating base and insulating turntable being carbonized or even damaged by arc burning.

[0017] Meanwhile, because the arc-initiating plate is arranged in the second groove and there is a second gap between it and the groove wall of the second groove, a stable slit structure can be formed between the groove wall of the second groove and the arc-initiating plate. As the electric arc flows along the arc-initiating plate, it can be extinguished in the gap between the arc-initiating plate and the groove wall of the second groove. This further reduces the energy of the electric arc entering the arc-extinguishing chamber, which can further reduce the number of arc-extinguishing structures required for the arc-extinguishing chamber. This helps to further reduce the volume of the arc-extinguishing chamber, reduce the overall volume and weight of the switching device, and further reduce the manufacturing cost of the switching device.

[0018] In conjunction with the first aspect, in some feasible embodiments, the second groove includes a first groove segment and a second groove segment connected together, the first groove segment communicating with the first groove, and in the extending direction of the second groove, the width of the first groove segment decreasing as the distance from the second groove segment decreases, while the width of the second groove segment remains constant.

[0019] The width of the first slot decreases as the distance to the second slot decreases, while the width of the second slot remains the same. This causes the width of the first slot to gradually narrow as it approaches the second slot, forming a flared structure. When the electric arc generated during the opening process enters the second slot from the first slot, it will first pass through the wider flared first slot. The larger entrance space can accommodate a wide-ranging electric arc, guiding the arc smoothly and quickly into the second slot. This reduces the probability of the arc lingering or accumulating at the slot opening of the second slot, and also reduces the probability of the arc burning the insulating base around the slot opening of the second slot, thus helping to extend the service life of the switching device.

[0020] Meanwhile, with the arc-initiating plate remaining in the same orientation and not tilted within the second groove, the uniform width of the second groove allows for a constant-width gap to be formed between the arc-initiating plate and the groove wall. As the arc flows through this constant gap, the cooling and arc-compression effects of the slit are stably utilized, resulting in a continuous and stable arc-extinguishing effect. This sustainably and efficiently consumes the energy of the arc, further reducing the energy of the arc flowing into the arc-extinguishing chamber. This further reduces the number of arc-extinguishing structures inside the arc-extinguishing chamber, contributing to a reduction in the overall size and weight of the switching device, as well as lowering its manufacturing costs.

[0021] In conjunction with the first aspect, in some feasible ways, one end of the arc-inducing piece extends into the first groove, and in the depth direction of the first groove, the end of the arc-inducing piece located in the first groove is farther from the bottom of the first groove than the arc-shaped protrusion.

[0022] Specifically, one end of the arc-inducing piece extending into the first groove is positioned above the arc-shaped protrusion in the depth direction of the first groove, in the same area as the arc generated during the opening stroke. In this way, firstly, the arc-shaped protrusion does not obstruct the arc-inducing piece, allowing the arc generated during the opening process to directly contact the end of the arc-inducing piece and be captured by it. This significantly improves the efficiency of the arc being drawn into the second groove, reducing the possibility of the arc remaining in the first groove and continuously burning the turntable and the groove wall, thus extending the service life of the switching device. Secondly, the arc-inducing piece does not hinder the rotation of the turntable and the arc-shaped protrusion. The turntable and the arc-shaped protrusion will not scrape or interfere with the arc-inducing piece during the opening and closing strokes, ensuring smooth turntable rotation and contributing to improved reliability of the switching device.

[0023] In conjunction with the first aspect, in some feasible embodiments, the switching device further includes multiple arc-extinguishing grids, which are stacked and spaced apart within the arc-extinguishing chamber, and the second groove communicates with the arc-extinguishing chamber at one end of the stacking direction of the multiple arc-extinguishing grids.

[0024] In this way, when the arc enters the arc-extinguishing chamber through the second groove, it enters the arc-extinguishing grid assembly from the starting position at the end of the entire stacked arc-extinguishing grid, allowing the arc to sequentially pass through the interval area of ​​each arc-extinguishing grid. Compared to the method of entering the arc from the middle or side of the stacked arc-extinguishing grid, this structure allows all the arc-extinguishing grids in the entire assembly to participate in the arc segmentation, cooling, and cutting off work, eliminating any idle grid structures that do not participate in arc extinguishing. Therefore, this application can fully utilize the segmenting effect of all the arc-extinguishing grids in the arc-extinguishing chamber, uniformly cutting the arc entering the arc-extinguishing chamber into multiple short arc segments, significantly increasing the number of arc segments and cooling efficiency, maximizing the arc-extinguishing capability of the arc-extinguishing grids, effectively attenuating residual arc energy, improving the overall arc extinguishing thoroughness, and achieving the optimal arc extinguishing effect with the same number of arc-extinguishing grids. This further eliminates the situation of incomplete arc extinguishing and arc reignition under high-current breaking conditions, significantly improving the reliability of high-voltage breaking of the switching device.

[0025] In addition, the arc inlet setting at the end ensures that the arc travel path is highly compatible with the stacked arrangement of the grid plates, resulting in regular arc flow and uniform force. This avoids the situation where the arc is concentrated and erodes local grid plates, balances the workload of each arc-extinguishing grid plate, reduces the erosion and wear of the arc-extinguishing grid plates, and helps to improve the overall service life and structural stability of the arc-extinguishing chamber.

[0026] In conjunction with the first aspect, in some feasible embodiments, the second contact includes a conductive portion and an insulating rotating portion connected together. The conductive portion is used to contact the first contact, and the insulating rotating portion is rotatably connected to an insulating base. The conductive portion rotates with the insulating rotating portion to move closer to or away from the first contact.

[0027] The second contact includes an insulating rotating part and a conductive part. The insulating rotating part is rotatably connected to an insulating base, and the conductive part rotates with the insulating rotating part to move closer to or further away from the first contact. That is, the conductive part is only placed at the location where electrical contact is required, and the rotating parts are made of insulating material. This significantly reduces the overall amount of conductive metal material used, lightens the weight of the second contact, makes the rotation and opening / closing process of the stationary contact smoother and easier, and improves the smoothness and stability of the opening / closing operation of the switchgear. It also reduces the weight of the switchgear, meeting the requirements for lightweight switchgear.

[0028] In addition, the rotating parts of the base are made of insulating material, which can prevent the metal conductive parts from directly rubbing against the base, effectively eliminating the risk of leakage and creepage during rotation, and helping to improve the overall insulation safety of the switch device.

[0029] In conjunction with the first aspect, in some feasible embodiments, the conductive part has a second protrusion, which contacts the first contact when the first contact and the second contact are closed, and abuts against the rotating arc-shaped protrusion in the opening rotation direction of the first contact, so that the second contact rotates away from the insulating turntable.

[0030] When the first and second contacts are closed, the second protrusion of the conductive part contacts the first contact. That is, the protruding part of the conductive part contacts the first contact. In this way, during the opening stroke of the first and second contacts, the electric field concentration effect at the protrusion can be used to guide the arc to be stable at the second protrusion, avoiding the arc from randomly starting in other parts of the conductive part, reducing the possibility of the arc burning other parts, and helping to extend the service life of the second contact.

[0031] In conjunction with the first aspect, in some feasible embodiments, the switching device includes a third groove disposed on an insulating base, wherein a second contact is at least partially located within the third groove in the depth direction of the first groove, the third groove is in communication with an arc-extinguishing chamber, a plurality of arc-extinguishing grids are disposed within the arc-extinguishing chamber, and the conductive portion has a first end away from the insulating rotating portion, the first end being close to the plurality of arc-extinguishing grids.

[0032] The third groove of the second contact is connected to the arc-extinguishing chamber, and the first end of the conductive part is close to multiple arc-extinguishing grid plates. This allows the arc to be directly guided to the arc-extinguishing grid plates in the arc-extinguishing chamber from the first end of the conductive part, in addition to arc ignition by the arc-initiating plate. This provides a dual arc-guiding and arc-extinguishing path for the arc, combining arc ignition by the arc-initiating plate and direct arc ignition by the contact body. This allows for simultaneous arc diversion and shunting, significantly improving arc discharge efficiency and preventing arc energy from concentrating in the first groove and the contact area between the first and second contacts. This effectively reduces concentrated burning losses on the contacts and surrounding insulation structure caused by the arc.

[0033] In conjunction with the first aspect, in some feasible embodiments, the switching device further includes an exhaust channel and multiple gas generating elements disposed on an insulating base, with the first end of the conductive part located between two gas generating elements, wherein the gas generating elements are made of gas generating material, and the exhaust channel is opened in the arc-extinguishing chamber, connecting the arc-extinguishing chamber to the outside.

[0034] The conductive part of the second contact is in contact with the first contact, meaning the electric arc is located on the conductive part of the second contact. The arc raises the temperature of the conductive part, causing the two gas-generating elements, made of gas-generating material, to rapidly vaporize and transform into a large amount of gas. As the gas is consumed, the two gas-generating elements gradually melt away. Because the arc-extinguishing chamber is connected to the outside through an exhaust channel, the large amount of gas generated by the two gas-generating elements flows into the arc-extinguishing chamber, thereby pushing the arc at the second contact towards the interior of the arc-extinguishing chamber. This facilitates rapid arc extinguishing using the arc-extinguishing grid within the chamber, effectively reducing the arc-extinguishing time and improving the reliability of the switching device.

[0035] Simultaneously, the exhaust channel can promptly discharge the high-temperature gas generated by the vaporization of the gas-generating components, preventing continuous gas accumulation and pressure rise in the sealed space inside the switchgear. This avoids pressure deformation and cracking of the insulating base and arc-extinguishing chamber, thus ensuring the safe operation of the internal structure. Furthermore, continuous exhaust can stably maintain the pressure difference between the gas-generating zone and the arc-extinguishing chamber, ensuring the airflow continues to play its arc-driving role, allowing the arc to be stably delivered to the arc-extinguishing grid for segmented arc extinguishing. Moreover, while driving the current, the high-speed airflow can also simultaneously cool the arc, assisting in attenuating the arc energy. This, combined with the pre-arc extinguishing of the second groove slit, the dual-channel arc guiding of the conductive part and arc-initiating plate, and the segmented arc extinguishing of the arc-extinguishing grid, forms a multi-layered synergistic arc extinguishing system, effectively suppressing arc reignition under high-current breaking conditions and improving the reliability of the switchgear's high-voltage, high-current breaking capability.

[0036] Furthermore, this application employs two gas-generating components to clamp the second end of the stationary contact. On one hand, the two gas-generating components can simultaneously receive the high temperature of the conductive component. Compared to the scheme of arranging a single gas-generating component on only one side of the first end of the conductive component, this can significantly increase the total gas production, form a stronger directional airflow thrust, and accelerate the speed at which the arc is pushed into the arc-extinguishing chamber. This reduces the time for the arc to burn the conductive component and the insulating base, thereby reducing the risk of contact burn-out and insulation carbonization, and extending the service life of the components. On the other hand, the clamping of the first end of the conductive component by the two gas-generating components allows the two gas-generating components to be heated evenly. Compared to arranging multiple stacked gas-generating components on one side of the first end of the conductive component, this arrangement avoids the problem of uneven heating and uneven gas production of multiple gas-generating components on one side, while also ensuring the gas production rate and making the airflow driving force continuous and uniform.

[0037] In conjunction with the first aspect, in some feasible embodiments, the first contact has two opposing contact portions, and the switching device has two second contacts arranged along the outer periphery of the insulating turntable, which respectively contact or separate from the two contact portions.

[0038] In this way, when the insulating turntable rotates, the two contact parts can simultaneously make contact with the corresponding second contact to conduct or separate and disconnect. The two second contacts are arranged along the outer periphery of the insulating turntable, and the spatial layout is uniform and compact. This makes full use of the unused annular area around the insulating turntable, eliminating the need to arrange multiple sets of second contacts in a straight line. This significantly saves the planar space occupied by the insulating base, reduces the overall size of the insulating base, and thus reduces the overall volume and weight of the switching device, achieving a miniaturized and lightweight design.

[0039] In conjunction with the first aspect, in some feasible embodiments, the switching device further includes a first limiting component for limiting the rotational position of the first contact in the opening rotation direction and for limiting the rotational position of the first contact in the closing rotation direction.

[0040] By limiting the rotational position of the first contact by the first limiting component, the degree of freedom of the wire electrically connected to the first contact to rotate synchronously with the insulating turntable is restricted. This effectively prevents the wire from being twisted, stretched, or even broken due to overtravel rotation of the insulating turntable, thus ensuring the long-term reliability of the electrical connection.

[0041] In conjunction with the first aspect, in some feasible embodiments, the first limiting component includes a limiting wheel and two limiting blocks; the limiting wheel is connected to an insulating turntable and is located on the side of the insulating turntable near the bottom of the first groove; the outer edge of the limiting wheel has a slot, and the outer edge of the limiting wheel facing away from the slot has an abutment surface; the two limiting blocks are spaced apart along the circumference of the limiting wheel, each limiting block has a limiting protrusion, and each limiting block also has an abutment portion spaced apart from the limiting protrusion along the circumference of the limiting wheel; in the opening rotation direction of the first contact, the limiting protrusion is used to extend into the slot to limit the rotation position of the first contact; in the closing rotation direction of the first contact, the abutment portion is used to abut against the abutment surface to limit the rotation position of the first contact.

[0042] The limiting protrusion and the slot cooperate, and the abutting part cooperates with the abutting surface, limiting the overall rotation stroke of the insulating turntable and constraining the rotation angle of the insulating turntable within a preset range. In this way, it can prevent the insulating turntable from rotating beyond its range, and prevent the wires that are electrically connected to the first contact from being twisted, stretched, or even broken, which helps to ensure the long-term reliability of the connection between the two.

[0043] In conjunction with the first aspect, in some feasible embodiments, the switching device further includes a linkage mechanism connected to both the insulating rotary table and the second contact, so that the second contact rotates with the insulating rotary table.

[0044] In this way, when the insulating turntable rotates, the two second contacts can be driven to rotate simultaneously through a linkage mechanism. This provides the second contacts with multiple sources of rotational power, rather than relying entirely on the arc-shaped protrusion. Since the arc-shaped protrusion drives the second contacts through compression contact, its specific dimensions are directly related to the movement distance of the second contacts. Therefore, when the second contacts no longer depend entirely on the arc-shaped protrusion for propulsion, the machining accuracy requirements for the arc-shaped protrusion can be reduced, simplifying the forming process of the insulating turntable.

[0045] Simultaneously, the second contact and the insulating turntable are linked, allowing the turntable's rotation angle to be precisely transmitted to the two second contacts. This ensures that the opening and closing actions of the two second contacts are completely synchronized, avoiding any lag in the opening / closing of one side of the second contact. Furthermore, the two second contacts rotate synchronously with the insulating turntable, ensuring that the contact and separation sequences of the first and second contacts at both locations are completely unified during opening / closing. The generation of the arc on both sides and the timing of its introduction into the second groove are also consistent, guaranteeing uniform arc extinguishing effect in both arc extinguishing channels and preventing arc retention on one side or imbalance in arc extinguishing performance.

[0046] In conjunction with the first aspect, in some feasible embodiments, the linkage mechanism includes a first gear and a second gear; the first gear is connected to an insulating turntable and is disposed on the side of the insulating turntable near the bottom of the first groove, and the first gear has first tooth segments spaced circumferentially along the first gear; the second gear is connected to a second contact, and the first tooth segments mesh with the second gear.

[0047] This further enhances the synchronization between the insulating turntable and the second contact, facilitating precise control of the second contact's rotation angle and ensuring stable and controllable breaking distance and contact pressure between the first and second contacts. Furthermore, the first gear features only two tooth segments instead of a complete annular tooth structure, significantly reducing metal consumption compared to a full-tooth gear and effectively lowering the overall gear weight, thus meeting lightweight design requirements.

[0048] In conjunction with the first aspect, in some feasible embodiments, the linkage mechanism further includes a second limiting component, which includes a rotating member and a limiting member; the rotating member is connected to the first gear, and in the depth direction of the first groove, the rotating member is located between the first gear and the insulating turntable, and a first sliding groove is formed on the edge of the rotating member facing the surface of the insulating turntable; in the depth direction of the first groove, the limiting member is located between the second gear and the second contact, one end of the limiting member is connected to the second gear, and the end of the limiting member away from the second gear is embedded in the first sliding groove and can slide along the first sliding groove to limit the rotational stroke of the rotating member, the first gear and the insulating turntable.

[0049] One end of the limiting component is always embedded in the first sliding groove and slides, so that the side wall of the first sliding groove can constrain the circumferential range of movement of the limiting component throughout the entire process. In this way, not only can the two extreme positions of the rotation of the insulating turntable be locked, but the length of the first sliding groove itself can also precisely limit the effective rotation angle of the insulating turntable from closing to opening. It can precisely control the opening / closing contact distance and the breaking gap of the first contact and the second contact, ensure that the opening and closing angles of the two second contacts are highly uniform, and stabilize the working conditions for arc generation, arc ignition, and gas generation and arc extinguishing.

[0050] In conjunction with the first aspect, in some feasible embodiments, the switching device further includes a return spring connected to the second contact, the return spring being used to provide a spring force to the second contact toward the insulating turntable.

[0051] The reset spring is used to give the second contact a spring force to rotate toward the insulating turntable. It can continuously apply a force toward the insulating turntable to the second contact, so that the conductive part of the second contact is tightly attached to the first contact when the circuit is closed, thereby increasing the contact pressure, reducing the contact resistance, preventing the contact from overheating and burning when a large current is turned on, and improving the conductivity stability.

[0052] In addition, when there is a small meshing gap or transmission stroke deviation in the gear linkage, the preload of the return spring can compensate for the gap error, ensuring that the first contact and the second contact are always reliably engaged, thus improving the operational stability of the switching device under long-term frequent disconnection conditions.

[0053] Secondly, this application provides a power converter, which includes a power conversion circuit, a housing, and a switching device as described in the first aspect. The switching device is fixed to the housing, and the power conversion circuit is located inside the housing. The switching device is used to connect to a DC source and the power conversion circuit. When the switching device is closed, the DC source supplies power to the power converter. When the switching device is open, the DC source stops supplying power to the power converter.

[0054] By employing the aforementioned switching device, the power converter achieves substantially the same technical effects as the switching device. The specific technical effects of the switching device have been fully described in the section on switching device embodiments, and are therefore incorporated herein by reference in their entirety without further reiteration. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in some embodiments of this application will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this application.

[0056] Figure 1 This is a schematic diagram illustrating the application of the power converter provided in this application embodiment in a photovoltaic power supply system; Figure 2 This is a schematic diagram of a partial structure of a switching device provided in an embodiment of this application, wherein the first contact and the second contact are in the closed state; Figure 3 yes Figure 2 A schematic diagram of a portion of the switching device from another perspective, showing the first and second contacts in the open state; Figure 4 yes Figure 2 A three-dimensional structural diagram of the insulating turntable in the image; Figure 5 yes Figure 3 Enlarged schematic diagram of the middle section structure; Figure 6 yes Figure 2 A three-dimensional structural diagram of the second contact in the process; Figure 7 This is a schematic diagram of a partial structure of another switching device provided in some embodiments of this application; Figure 8 This is a three-dimensional structural diagram of a partial structure of another switching device provided in some embodiments of this application, wherein the first limiting component is shown; Figure 9yes Figure 8 A three-dimensional structural diagram of a portion of the first limiting component in the diagram; Figure 10 This is a schematic diagram of a partial structure of another switching device provided in some embodiments of this application, wherein the linkage mechanism is shown; Figure 11 This is a schematic diagram of a partial structure of a switching device provided in some embodiments of this application, wherein the second limiting component is shown.

[0057] Explanation of reference numerals in the attached figures: 10. Insulating base; 11. First groove; 111. Arc-extinguishing section; 12. Second groove; 13. Arc-extinguishing chamber; 131. Arc-extinguishing grid; 14. Exhaust channel; 15. Third groove; 20. First contact assembly; 21. First contact; 211. Contact portion; 22. Insulating turntable; 221. Body; 222. Arc-shaped protrusion; 223. First protrusion; 30. Second contact; 31. Conductive portion; 312. First end; 313. Second protrusion; 32. Insulating rotating portion; 33. Assist structure; 40 50. Arc-inducing plate; 60. Gas-generating component; 61. First limiting component; 62. Limiting block; 63. Limiting protrusion; 64. Abutment part; 65. Limiting wheel; 66. Slot; 77. Linkage mechanism; 78. First gear; 79. First tooth segment; 70. Second gear; 81. Second limiting component; 82. Rotating component; 83. First sliding groove; 84. Limiting component; 95. Return spring; 100. Power converter; 200. Photovoltaic module; 110. DC switch; 120. Controller; 130. Trip unit. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application are within the scope of protection of this application.

[0059] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. "At least one" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0060] "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, a and / or b can mean: a exists alone, a and b exist simultaneously, or b exists alone. Here, a and b can be singular or plural.

[0061] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. Meanwhile, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is being used as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0062] In describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be interpreted broadly; for example, "connection" can mean a direct link or an indirect link through an intermediate medium. For instance, in describing some embodiments, the term "connection" may be used to indicate that two or more components have direct physical or electrical contact with each other.

[0063] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0064] In this application embodiment, "upper," "lower," "left," and "right" are not limited to the orientation of the components schematically placed in the accompanying drawings. It should be understood that these directional terms can be relative concepts used for description and clarification, and can vary accordingly depending on the orientation of the components in the accompanying drawings. In the drawings, for clarity, the thickness of layers and regions is exaggerated, and the dimensional proportions between the parts in the illustrations do not reflect actual dimensional proportions. Therefore, variations in shape relative to the drawings are conceivable due to, for example, manufacturing techniques and / or tolerances. Therefore, exemplary embodiments should not be construed as being limited to the shapes of the areas shown in this application, but rather include shape deviations caused, for example, by manufacturing. For example, an etched area shown as rectangular would typically have a curved feature. Therefore, the areas shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0065] Furthermore, the architecture and scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of architecture and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0066] Please refer to Figure 1 , Figure 1 This is a schematic diagram illustrating the application of the power converter provided in this application embodiment in a photovoltaic power supply system, as shown below. Figure 1 As shown, the photovoltaic power supply system includes a power converter 100 and a photovoltaic module 200. The power converter 100 converts direct current (DC) from the photovoltaic module 200 into alternating current (AC) and transmits the AC power to the grid or load. Figure 1(Not shown). Specifically, the power converter 100 includes multiple DC terminals, a DC switch 110, a DC / DC circuit, DC buses BUS+ and BUS-, a DC / AC circuit, a grid-connected switch, and a controller 120. In practical applications, the photovoltaic module 200 is connected to the DC terminals, which then transmits DC power to the DC / DC circuit via the DC switch 110. The DC / DC circuit transforms the DC power and transmits it to the DC / AC circuit via the DC bus. Subsequently, the DC / AC circuit converts the DC power into AC power and transmits it to the grid or load via the grid-connected switch. Furthermore, the DC switch 110 includes multiple sub-switches and a trip unit. One end of each sub-switch is used to connect to one or more parallel photovoltaic strings, where each photovoltaic string includes multiple photovoltaic modules 200 connected in series. The other end of each sub-switch is used to connect to a DC / DC circuit. The trip unit 130 receives a trip signal from the controller 120, thereby promptly tripping the DC switch 110 to eliminate the fault when the current flowing through the sub-switch is abnormal. For example, when the current value flowing through at least one sub-switch of the DC switch 110 exceeds a set threshold, or when the current flowing through at least one sub-switch of the DC switch 110 is a reverse current, the controller 120 sends a trip signal to the trip unit 130, causing the trip unit 130 to promptly release the corresponding linkage structure, achieving reliable disconnection of at least one sub-switch. In practical applications, due to the interconnected setup of multiple sub-switches, they generally close or open simultaneously. It is worth mentioning that when the photovoltaic power supply system is working normally, the current between the photovoltaic string and the power converter 100 is a forward current. The direction of the forward current is from the photovoltaic module 200 to the DC / DC circuit. When the photovoltaic string is reverse-connected or a short-circuit fault occurs in the photovoltaic string, the photovoltaic power supply system will have a reverse current. The direction of the reverse current is from the DC / DC circuit to the photovoltaic panel, or from other photovoltaic strings connected in parallel with the reverse-connected or short-circuited photovoltaic string to the reverse-connected or short-circuited photovoltaic string. For example, when the positive terminal of the photovoltaic string is connected to the negative terminal of the DC terminal and the negative terminal of the photovoltaic string is connected to the positive terminal of the DC terminal, i.e. when the photovoltaic string is reverse-connected, or when one photovoltaic string is short-circuited, the equivalent impedance of either of the two types of photovoltaic strings will be much lower than the equivalent impedance of the power converter 100. Therefore, the current of other photovoltaic strings connected in parallel with the two types of photovoltaic strings will be directly injected into the two types of photovoltaic strings. At this time, the current on the sub-switch connected to either of the two types of photovoltaic strings is the reverse current.

[0067] It should be noted that a power converter can be either a photovoltaic inverter or a power conversion system (PCS). Unlike photovoltaic inverters, the DC terminals of a power conversion system can be connected not only to photovoltaic modules but also to energy storage batteries. Therefore, the power conversion system can not only convert DC power from photovoltaic modules or energy storage batteries into AC power, but also rectify AC power from the grid into DC power to charge energy storage, thereby improving the energy utilization efficiency of the power supply system.

[0068] For ease of understanding and explanation, this application will describe the specific structure of the switching device in conjunction with the accompanying drawings. It should be understood that the application of this switching device as a DC switch in a photovoltaic inverter is only one example of its application scenario and is not intended to limit the application scenarios of this switching device.

[0069] Please refer to Figures 2 to 4 ,in, Figure 2 This is a schematic diagram of a partial structure of a switching device provided in an embodiment of this application, wherein the first contact and the second contact are in the closed state. Figure 3 yes Figure 2 This is a schematic diagram of a portion of the switching device from another perspective, showing the first and second contacts in the open state. Figure 4 yes Figure 2 A three-dimensional structural diagram of the turntable in the image, as shown below. Figures 2 to 4As shown, this application provides a switching device, which includes an insulating base 10, a first contact assembly 20, a second contact 30, and an arc-extinguishing chamber 13. The insulating base 10 has a first groove 11. The first contact assembly 20 is disposed in the first groove 11 and rotatably connected to the insulating base 10. The first contact assembly 20 includes an insulating turntable 22 and a first contact 21 disposed on the insulating turntable 22. The second contact 30 is disposed on the insulating base 10 and rotatably connected to the insulating base 10. The first contact 21 rotates with the insulating turntable 22 to close or open with the second contact 30. The insulating turntable 22 includes a body 221. The groove wall of the first groove 11 corresponding to the rotation angle of the first contact 21 in the opening stroke is an arc-extinguishing section 111. In the opening rotation direction of the first contact 21, the first gap between the outer peripheral surface of the body 221 and the arc-extinguishing section 111 gradually decreases. As the first gap between the outer peripheral surface of the body 221 and the arc-extinguishing section 111 gradually decreases in the opening rotation direction of the first contact 21, the first gap can achieve slit arc extinguishing during the opening stroke. The arc extinguishing process can be understood as follows: when opening, an electric arc is formed between the first contact 21 and the second contact 30, and during the opening stroke of the first contact 21, the electric arc between the first contact 21 and the second contact 30 will be elongated. That is, when the insulating turntable 22 rotates along the opening direction, it drives the first contact 21 to rotate, so that the electric arc at the first contact 21 is pulled from a wider gap into a narrower gap. The electric arc will be compressed and thinned by the constraint of the wall of the first gap. That is, the electric arc is squeezed by the slit, thereby rapidly cooling and gradually extinguishing, thus achieving slit arc extinguishing.

[0070] Meanwhile, the outer peripheral surface of the body 221 is provided with an arc-shaped protrusion 222, and in the opening rotation direction of the first contact 21, the rotating arc-shaped protrusion 222 pushes the second contact 30 to rotate away from the insulating turntable 22. In this way, the arc between the first contact 21 and the second contact 30 can be further lengthened, so that the energy of the arc can be further attenuated, which helps to extinguish the arc.

[0071] Furthermore, the arc-extinguishing chamber 13 is disposed on the insulating base 10 and is connected to the first gap. This allows the arc to enter the arc-extinguishing chamber 13 through the first gap, thereby extinguishing the arc using the arc-extinguishing chamber 13. In other words, the switching device provided in this application simultaneously possesses both slot arc extinguishing and arc-extinguishing chamber arc extinguishing methods. The combination of these two methods can achieve complete arc extinguishing. For example, in some high-voltage applications, it is not necessary to increase the space of the arc-extinguishing chamber 13 to improve the arc extinguishing capability; this application can achieve complete arc extinguishing.

[0072] In summary, the switching device provided in this application extinguishes the arc through a slit by using the first gap, thus consuming the energy of the arc. This means that the energy of the arc entering the arc-extinguishing chamber 13 is only a portion of the total energy of the arc. Compared to the case where all the energy of the arc is consumed through the arc-extinguishing chamber 13, the arc-extinguishing chamber 13 of the switching device in this application is only responsible for consuming a portion of the arc energy. This reduces the number of arc-extinguishing structures (such as arc-extinguishing grids) required in the arc-extinguishing chamber 13, and the overall size of the arc-extinguishing chamber 13 is small. This helps to reduce the overall volume and weight of the switching device. At the same time, the reduced number of arc-extinguishing structures (such as arc-extinguishing grids) also reduces the manufacturing cost of the switching device.

[0073] It is understood that the opening distance, slit length and width of the first contact 21 and the second contact 30 when they are disconnected in the embodiments of this application are all related to the strength of the electric arc generated between the first contact 21 and the second contact 30. The strength of the electric arc is related to the current and voltage of the application scenario in which the switching device is located. Therefore, the above content is not limited in the embodiments of this application.

[0074] In some embodiments, the arc-shaped protrusion 222 gradually increases in length in the radial direction of the insulating turntable 22. That is, during the opening stroke of the first contact 21, the arc-shaped protrusion 222 pushes the second contact 30 gradually away from the body 221, increasing the distance between the second contact 30 and the body 221. The first contact 21 and the second contact 30 further move away from each other, causing the arc between them to be further lengthened. The lengthened arc can consume some of its energy, thus further reducing the arc-extinguishing load on the arc-extinguishing chamber 13 and the first gap, thereby improving the overall arc-extinguishing stability. In addition, the continuous movement of the second contact 30 away from the insulating turntable 22 also keeps the arc on the second contact 30 away from the insulating turntable 22, preventing the arc from continuously burning the insulating turntable 22, effectively preventing the insulating turntable 22 from carbonization or even breakdown damage due to arc burning, thereby helping to extend the overall service life of the switching device.

[0075] In some embodiments, the arc-shaped protrusion 222 is located near the bottom of the first groove 11, and the first gap is located above the arc-shaped protrusion 222. This maximizes the height above the arc-shaped protrusion 222 in the depth direction of the first groove 11, and maximizes the space enclosed by the arc-shaped protrusion 222, the arc-extinguishing segment 111, and the outer peripheral surface of the body 221. This reduces the possibility of contact between the electric arc between the first contact 21 and the second contact 30 and the arc-shaped protrusion 222, the wall of the first groove 11, and the outer peripheral surface of the body 221. This helps reduce the carbonization or even breakdown damage to the insulating turntable 22 and the insulating base 10 caused by the electric arc, further extending the service life of the switching device.

[0076] In some embodiments, a first protrusion 223 is provided on the outer peripheral surface of the body 221. In the opening rotation direction of the first contact 21, the first protrusion 223 is located at the end of the arc-shaped protrusion 222. The first protrusion 223, the arc-extinguishing section 111, the outer peripheral surface of the body 221 and the arc-shaped protrusion 222 enclose and form an accommodating space. The accommodating space is connected to the arc-extinguishing chamber 13, and the first gap is located in the accommodating space.

[0077] Because the first gap between the outer peripheral surface of the body 221 and the arc-extinguishing section 111 gradually decreases in the opening rotation direction of the first contact 21, and the first protrusion 223 is located at the end of the arc-shaped protrusion 222, the accommodating space formed by the first protrusion 223, the arc-extinguishing section 111, the outer peripheral surface of the body 221 and the arc-shaped protrusion 222 is almost closed in the opening rotation direction of the first contact 21, which reduces the risk that the electric arc between the first contact 21 and the second contact 30 will extend to other parts after touching the groove wall of the first groove 11, thereby reducing the area of ​​the insulating base 10, the insulating turntable 22 and the like being burned, and further improving the service life of the switching device.

[0078] Please refer to Figure 5 ,in, Figure 5 yes Figure 3 An enlarged schematic diagram of the middle part of the structure, as shown below. Figure 5 As shown, in some embodiments of this application, the insulating base 10 has a second groove 12, which connects the first gap and the arc-extinguishing chamber 13. The arc-inducing plate 40 included in the switching device is disposed in the second groove 12, and there is a gap between the arc-inducing plate 40 and the groove wall of the second groove 12. In this way, the arc-inducing plate 40 can be used to guide the arc generated by the breaking of the first contact 21 and the second contact 30 during the opening of the insulating turntable 22 into the second groove 12. Compared with the structure without the arc-inducing plate 40, this arrangement in this application allows the arc to enter the second groove 12 more smoothly and quickly from the first groove 11, which can greatly improve the introduction efficiency of the arc into the second groove 12 and reduce the situation of the arc lingering and accumulating in the first groove 11. This further reduces the risk of the insulating base 10 and the insulating turntable 22 being carbonized or even damaged by arc burning. Meanwhile, the arc-initiating plate 40 is arranged in the second groove 12 and there is a gap between it and the groove wall of the second groove 12, so that a stable slit structure can be formed between the groove wall of the second groove 12 and the arc-initiating plate 40. During the process of the electric arc flowing along the arc-initiating plate 40, the arc can be extinguished in the gap between the arc-initiating plate 40 and the groove wall of the second groove 12.

[0079] Meanwhile, because the arc-initiating plate 40 is arranged in the second groove 12 and there is a second gap between it and the groove wall of the second groove 12, a stable slit structure can be formed between the groove wall of the second groove 12 and the arc-initiating plate 40. As the electric arc flows along the arc-initiating plate 40, it can be extinguished in the gap between the arc-initiating plate 40 and the groove wall of the second groove 12. This further reduces the energy of the electric arc entering the arc-extinguishing chamber 13, which can further reduce the number of arc-extinguishing structures required in the arc-extinguishing chamber 13. This helps to further reduce the volume of the arc-extinguishing chamber 13, reduce the overall volume and weight of the switching device, and further reduce the manufacturing cost of the switching device.

[0080] In some embodiments of this application, the second groove 12 includes a first groove segment and a second groove segment connected together. The first groove segment includes a groove opening. In the extending direction of the second groove 12, the width of the first groove segment decreases as the distance from the second groove segment decreases, and the width of the second groove segment remains the same.

[0081] This design causes the width of the first slot to gradually narrow as it approaches the second slot, forming a flared structure. When the electric arc generated during the opening process enters the second slot 12 from the first slot 11, it first passes through the wider flared first slot. The larger entrance space can accommodate a wider spread of the arc, guiding it smoothly and quickly into the second slot 12. This reduces the probability of the arc lingering or accumulating at the slot opening of the second slot 12, and lowers the probability of the arc burning the insulating base 10 around the slot opening of the second slot 12, thus helping to extend the service life of the switching device. Compared to a straight slot structure of equal width, this design of the second slot 12 effectively avoids the situation where the arc gets stuck at the slot opening and cannot be smoothly guided into the second slot 12.

[0082] Meanwhile, with the arc-initiating plate 40 placed in the second groove 12 in an unchanged orientation and without tilting, the arc-initiating plate 40 arranged in the second groove section and the groove wall of the second groove 12 can form a gap of constant width because the width of the second groove section is the same. When the arc flows through this constant gap, the cooling and arc-compression effects of the slit can be stably exerted, making the arc-extinguishing effect of the slit continuous and stable, and continuously and efficiently consuming arc energy, further reducing the arc energy flowing into the arc-extinguishing chamber 13 at the rear end. This reduces the number of arc-extinguishing structures configured inside the arc-extinguishing chamber 13, which helps to further reduce the overall size and weight of the switching device, as well as reduce the manufacturing cost of the switching device.

[0083] Please continue to refer to this. Figure 5In some embodiments of this application, the arc-initiating plate 40 extends along the depth direction of the second groove 12. Thus, the arc-initiating plate 40 has sufficient extension length along the longitudinal direction of the second groove 12, thereby forming a longer slit channel between the arc-initiating plate 40 and the groove wall of the second groove 12. When the electric arc flows through the second groove 12, it can flow entirely along the arc-initiating plate 40, fully passing through the long and narrow gap formed by the arc-initiating plate 40 and the groove wall of the second groove 12. This significantly improves the compression and cooling effect of the slit on the electric arc, fully consumes the electric arc energy, further reduces the electric arc energy flowing into the arc-extinguishing chamber 13, further reduces the overall size and weight of the switching device, and lowers the manufacturing cost of the switching device.

[0084] In some embodiments of this application, one end of the arc-inducing piece 40 extends into the first groove 11, and in the depth direction of the first groove 11, the end of the arc-inducing piece 40 located in the first groove 11 is farther from the bottom of the first groove 11 than the arc-shaped protrusion 222. That is, the end of the arc-inducing piece 40 located in the first groove 11 is in the area above the arc-shaped protrusion 222 in the depth direction of the first groove 11, and is in the same area as the arc generated during the opening stroke. In this way, on the one hand, the arc-shaped protrusion 222 will not block the arc-inducing piece 40, and the arc generated during the opening process can directly contact the end of the arc-inducing piece 40, so that the arc-inducing piece 40 can directly contact and capture the arc, which greatly improves the efficiency of the arc being drawn into the second groove 12, reduces the situation where the arc remains in the first groove 11 and continuously burns the insulating turntable 22, the groove wall of the first groove 11, etc., and extends the service life of the switching device. On the other hand, the arc-inducing plate 40 will not obstruct the rotation of the insulating turntable 22 and the arc-shaped protrusion 222. The insulating turntable 22 and the arc-shaped protrusion 222 will not scrape or interfere with the arc-inducing plate 40 during the opening and closing strokes, which can ensure the smooth rotation of the insulating turntable 22 and help improve the reliability of the switching device.

[0085] In some embodiments of this application, the arc-extinguishing chamber 13 is connected to the end of the second groove 12 opposite to the first groove 11. That is, the arc-extinguishing chamber 13 is connected to the end of the second groove 12 opposite to the first groove 11, thus forming a continuous arc-extinguishing channel with the first groove 11, the second groove 12, and the arc-extinguishing chamber 13 connected end-to-end. Therefore, the arc introduced into the second groove 12 via the arc-starting plate 40 will flow along the entire extension length of the second groove 12, making full use of the overall length of the second groove 12, allowing the arc to flow through the narrow gap formed by the arc-starting plate 40 and the groove wall of the second groove 12. Compared to a structure where the arc-extinguishing chamber 13 is connected to the middle section of the second groove 12 or near the first groove 11, this arrangement in this application maximizes the use of the narrow channel to achieve long-distance, continuous arc cooling and energy attenuation. Therefore, the arc-extinguishing chamber 13 of the switching device provided in this application is connected to the end of the second groove 12 that is away from the first groove 11. On the one hand, it effectively extends the arc-extinguishing passage path of the arc slit, and fully consumes the arc energy by relying on the full-length slit structure, which greatly reduces the arc energy intensity entering the arc-extinguishing chamber 13. Under the premise of meeting the same high-voltage and high-current arc extinguishing requirements, it can further reduce the number of arc-extinguishing structures required to be configured inside the arc-extinguishing chamber 13, effectively reduce the overall cavity size of the arc-extinguishing chamber 13, and help reduce the overall volume and weight of the switching device, as well as reduce the manufacturing cost of the switching device.

[0086] Please refer to Figure 5 In some embodiments of this application, the switching device further includes a plurality of arc-extinguishing grid plates 131, which are stacked and spaced apart in the arc-extinguishing chamber 13, and the second groove 12 communicates with the arc-extinguishing chamber 13 at one end of the stacking direction of the plurality of arc-extinguishing grid plates 131.

[0087] In this way, when the electric arc enters the arc-extinguishing chamber 13 through the second groove 12, it enters the interior of the stacked arc-extinguishing grid 131 from the starting position at the end of the entire set of stacked arc-extinguishing grids 131, allowing the electric arc to pass through the interval area of ​​each arc-extinguishing grid 131 in sequence. Compared with the method of entering the arc from the middle or side of the stacked arc-extinguishing grid 131, this structure allows all the arc-extinguishing grids 131 in the entire set to participate in the arc segmentation, cooling and cutting off work, and there are no idle arc-extinguishing grids 131 that do not participate in the arc extinguishing. Therefore, the end-aligned arc entry arrangement adopted in this application can, on the one hand, fully utilize the dividing effect of all the arc-extinguishing grid plates 131 in the arc-extinguishing chamber 13 to uniformly cut the arc entering the arc-extinguishing chamber 13 into multiple short arc segments, greatly increasing the number of arc segments and cooling efficiency, maximizing the arc-extinguishing capability of the arc-extinguishing grid plates 131, effectively attenuating residual arc energy, and improving the overall arc-extinguishing thoroughness; on the other hand, under the premise of the same number of arc-extinguishing grid plates 131, the optimal arc-extinguishing effect can be obtained, further eliminating the situation of incomplete arc extinguishing and arc reignition under high current breaking conditions, and significantly improving the reliability of high-voltage breaking of the switching device.

[0088] Furthermore, the end-entry arc structure ensures that the arc travel path is highly compatible with the stacking arrangement direction of the arc-extinguishing grid plates 131, resulting in regular arc flow and uniform force. Therefore, it can avoid the situation where the arc concentrates and erodes a local area of ​​the arc-extinguishing grid plates 131, balance the workload of each arc-extinguishing grid plate 131, reduce the erosion and wear of the arc-extinguishing grid plates 131, and help improve the overall service life and structural stability of the arc-extinguishing chamber 13.

[0089] Please refer to Figure 6 , Figure 6 yes Figure 2 A three-dimensional structural diagram of the stationary contact in the image, as shown below. Figure 6 As shown, in some embodiments of this application, the second contact 30 includes a conductive part 31 and an insulating rotating part 32 connected to each other. The conductive part 31 is used to contact the first contact 21, and the insulating rotating part 32 is rotatably connected to the insulating base 10. The conductive part 31 rotates with the insulating rotating part 32 to move closer to or away from the first contact 21.

[0090] The second contact 30 of this application includes an insulated rotating part 32 and a conductive part 31. Specifically, only the conductive part 31 is used for the electrical contact required, and the rotating mating parts are formed using an insulating material. This eliminates the need to fabricate the entire second contact 30 using high-cost conductive metal material. On the one hand, this significantly reduces the overall amount of conductive metal material used, effectively lowering the raw material cost of the second contact 30 and consequently reducing the overall manufacturing cost of the switchgear. On the other hand, the lighter weight of the insulating rotating part 32, compared to a fully integrated metal second contact 30 structure, reduces the overall weight of the second contact 30, making the opening and closing process smoother and easier, with more sensitive rotational response, thus improving the smoothness and stability of the switchgear's opening / closing actions. Furthermore, by having the insulated rotating part 32 directly rotate with the base, direct frictional contact between the metal conductive part 31 and the base is avoided, effectively preventing leakage and creepage hazards during rotation and improving the overall insulation safety of the switchgear.

[0091] In some embodiments, the conductive part 31 has a second protrusion 313. When the first contact 21 and the second contact 30 are closed, the second protrusion 313 contacts the first contact 21. In the opening rotation direction of the first contact 21, the second protrusion 313 abuts against the rotating arc-shaped protrusion 222, so that the second contact 30 rotates away from the insulating turntable 22.

[0092] When the first contact 21 and the second contact 30 are closed, the second protrusion 313 of the conductive part 31 contacts the first contact 21. That is, the protruding part of the conductive part 31 contacts the first contact 21. In this way, during the opening stroke of the first contact 21 and the second contact 30, the electric field concentration effect at the protrusion can be used to guide the arc to be stable at the second protrusion 313, avoiding the arc from randomly starting in other parts of the conductive part 31, reducing the possibility of the arc burning other parts, and helping to extend the service life of the second contact 30.

[0093] Please refer to Figure 7 , Figure 7 This is a schematic diagram of a partial structure of another switching device provided in some embodiments of this application, such as... Figure 7 As shown, in some embodiments of this application, the switching device includes a third groove 15, which is disposed on the insulating base 10. In the depth direction of the first groove 11, the second contact 30 is at least partially located within the third groove 15. The third groove 15 communicates with the arc-extinguishing chamber 13, which contains a plurality of arc-extinguishing grid plates 131. The conductive part 31 has a first end 312 away from the insulating rotating part 32, and the first end 312 is close to the plurality of arc-extinguishing grid plates 131. As mentioned above, during the opening stroke, an arc is generated when the first contact 21 separates from the conductive part 31 of the second contact 30. In this application, the third groove 15 of the second contact 30 is connected to the arc-extinguishing chamber 13, and the first end 312 of the conductive part 31 is close to the plurality of arc-extinguishing grid plates 131. This allows the arc to be directly guided to the arc-extinguishing grid plates 131 of the arc-extinguishing chamber 13 by the first end 312 of the conductive part 31, in addition to the arc ignition by the arc-initiating plate 40. In this way, a dual arc-guiding and arc-extinguishing path is provided for the electric arc, which can simultaneously guide and divert the electric arc, greatly improve the arc discharge efficiency, and avoid the electric arc energy from accumulating in the first groove 11 and the contact area of ​​the first contact 21 and the second contact 30, effectively reducing the concentrated burning loss of the electric arc on the contact and surrounding insulation structure.

[0094] In some embodiments, the second contact 30 includes an assist structure 33, which is disposed on the side of the insulating rotating part 32 facing the first contact 21. The assist structure 33 and the second protrusion 313 are arranged sequentially along the opening rotation direction of the first contact 21. In the opening rotation direction of the first contact 21, the arc-shaped protrusion 222 pushes the assist structure 33 to move the second contact 30 away from the bottom of the third groove 15. This reduces the friction between the second contact 30 and the bottom of the third groove 15, facilitates the rotation of the second contact 30, and allows it to quickly move away from the insulating turntable 22, reducing the time for arc burning of the insulating turntable 22 and helping to extend the overall service life of the switching device.

[0095] Please continue the exam. Figure 7 In some embodiments of this application, the switching device further includes an exhaust channel 14 and a plurality of gas generating elements 50. The plurality of gas generating elements 50 are disposed on the insulating base 10, and the first end 312 of the conductive part 31 is located between two gas generating elements 50. The gas generating elements 50 are made of gas generating material. The exhaust channel 14 is opened in the arc-extinguishing chamber 13, so that the arc-extinguishing chamber 13 is connected to the outside.

[0096] During the opening stroke, the separation of the first contact 21 and the second contact 30 will generate a high-temperature electric arc. As mentioned earlier, the second contact 30 is in contact with the first contact 21, meaning the electric arc is located on the conductive part 31 of the second contact 30. Therefore, the electric arc will raise the temperature of the conductive part 31. The gas-generating element 50, made of gas-generating material, will rapidly vaporize and transform into a large amount of gas upon heating. The gas-generating element 50 will gradually melt as the gas is consumed. Because the arc-extinguishing chamber 13 is connected to the outside through the exhaust channel 14, the large amount of gas generated by the gas-generating element 50 will flow into the arc-extinguishing chamber 13, thereby pushing the electric arc at the second contact 30 into the interior of the arc-extinguishing chamber 13. This facilitates rapid arc extinguishing using the arc-extinguishing grid 131 within the arc-extinguishing chamber 13, effectively reducing the arc-extinguishing time and thus improving the reliability of the switching device.

[0097] Meanwhile, the exhaust channel 14 can promptly discharge the high-temperature gas generated by the vaporization of the gas-generating component 50, preventing continuous gas accumulation and pressure rise in the sealed space inside the switchgear. This avoids the insulation base 10 and the arc-extinguishing chamber 13 from deforming and cracking under pressure, thus ensuring the safety of the internal structure. Furthermore, continuous exhaust can stably maintain the pressure difference between the gas-generating area and the arc-extinguishing chamber 13, ensuring that the airflow continues to play an arc-driving role, allowing the arc to be stably delivered into the arc-extinguishing grid 131 for segmented arc extinguishing. Moreover, while driving the current, the high-speed airflow can also simultaneously blow and cool the arc, assisting in attenuating the arc energy. This, together with the pre-arc extinguishing of the second groove 12 slit, the dual-channel arc guiding of the conductive part 31 and the arc-initiating plate 40, and the segmented arc extinguishing of the arc-extinguishing grid 131, forms a multi-layered synergistic arc extinguishing system, effectively suppressing arc reignition under high-current breaking conditions and improving the reliability of high-voltage, high-current breaking of the switch.

[0098] Furthermore, this application employs two gas-generating components 50 to clamp the first end 312 of the second contact 30. On one hand, the two gas-generating components 50 can simultaneously receive the high temperature of the conductive part 31. Compared to the scheme of arranging a single gas-generating component 50 on only one side of the first end 312 of the conductive part 31, this can significantly increase the total gas production, form a stronger directional airflow thrust, and accelerate the speed at which the arc is pushed into the arc-extinguishing chamber 13. This reduces the time for the arc to burn the conductive part 31 and the insulating base 10, thereby reducing the risk of contact burn-out and insulation carbonization, and extending the service life of the components. On the other hand, the clamping of the first end 312 of the conductive part 31 by the two gas-generating components 50 can make the two gas-generating components 50 heat up evenly. Compared to arranging multiple stacked gas-generating components 50 on one side of the first end 312 of the conductive part 31, this application's arrangement does not result in uneven heating or uneven gas production of multiple gas-generating components 50 on one side, thus ensuring the gas production rate and making the airflow driving force continuous and uniform.

[0099] In some embodiments of this application, the first contact 21 has two opposing contact portions 211, and the switching device has two second contacts 30. The two second contacts 30 are arranged along the outer periphery of the insulating turntable 22 and are in contact with or separated from the two contact portions 211 respectively.

[0100] With this configuration, when the insulating turntable 22 rotates, the two contact parts 211 can simultaneously make contact with the corresponding second contact 30 to conduct or separate. The two second contacts 30 are arranged along the outer periphery of the insulating turntable 22, resulting in a uniform and compact spatial layout. This makes full use of the unused annular area around the insulating turntable 22, eliminating the need for multiple sets of contacts to be arranged in a straight line. This significantly saves the planar space occupied by the insulating base 10, reduces the overall size of the insulating base 10, and consequently reduces the overall volume and weight of the switching device, achieving a miniaturized design.

[0101] In some embodiments, the switching device further includes a first limiting component 60, which is used to limit the rotational position of the first contact 21 in the opening rotational direction and to limit the rotational position of the first contact 21 in the closing rotational direction.

[0102] By limiting the rotation position of the first contact 21 by the first limiting component 60, the degree of freedom of the wire electrically connected to the first contact 21 to rotate synchronously with the insulating turntable 22 is restricted. This effectively prevents the wire from being twisted, stretched, or even broken due to overtravel rotation of the insulating turntable 22, and ensures the long-term reliability of the electrical connection.

[0103] Please refer to Figure 8 and Figure 9 , Figure 8 This is a three-dimensional structural diagram of a partial structure of another switching device provided in some embodiments of this application, wherein the first limiting component is shown. Figure 9 yes Figure 8 A three-dimensional structural diagram of a portion of the first limiting component, as shown below. Figure 8 and Figure 9 As shown, in some embodiments of this application, the first limiting component 60 includes a limiting wheel 62 and two limiting blocks 61; the limiting wheel 62 is connected to the insulating turntable 22, and the limiting wheel 62 is disposed on the side of the insulating turntable 22 near the bottom of the first groove 11. The outer edge of the limiting wheel 62 is provided with a slot 623, and the outer edge of the limiting wheel 62 and the side away from the slot 623 has an abutment surface; the two limiting blocks 61 are arranged at intervals along the circumference of the limiting wheel 62, each limiting block 61 has a limiting protrusion 611, and each limiting block 61 also has an abutment portion 612 arranged at intervals along the circumference of the limiting wheel 62 and the limiting protrusion 611; in the opening rotation direction of the first contact 21, the limiting protrusion 611 is used to extend into the slot 623 to limit the rotation position of the first contact 21; in the closing rotation direction of the first contact 21, the abutment portion 612 is used to abut against the abutment surface to limit the rotation position of the first contact 21.

[0104] like Figure 8 The limiting protrusion 611 and the slot 623 cooperate, and the abutting part 612 cooperates with the abutting surface, limiting the overall rotation stroke of the insulating turntable 22 and constraining the rotation angle of the insulating turntable 22 within a preset range. In this way, over-rotation of the insulating turntable 22 can be avoided, and the wires electrically connected to the first contact 21 can be prevented from being twisted, stretched, or even broken, which helps to ensure the long-term reliability of the connection between the two.

[0105] Please refer to Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of a partial structure of another switching device provided in some embodiments of this application, wherein the linkage mechanism is shown. Figure 11 This is a schematic diagram of a partial structure of a switching device provided in some embodiments of this application, wherein the second limiting component is shown, as... Figure 10 and Figure 11As shown, in some embodiments of this application, the switching device further includes a linkage mechanism 70, which is connected to the insulating turntable 22 and the two second contacts 30, respectively, so that both second contacts 30 rotate with the insulating turntable 22. This allows the two second contacts 30 to rotate synchronously via the linkage mechanism 70 when the insulating turntable 22 rotates, providing multiple sources of rotational power for the second contacts, rather than relying entirely on the arc-shaped protrusion 222. Because the arc-shaped protrusion 222 drives the second contacts 30 through compression contact, its specific value is directly related to the moving distance of the second contacts 30. Therefore, when the second contacts 30 no longer rely entirely on the arc-shaped protrusion 222 for propulsion, the processing precision requirements of the arc-shaped protrusion 222 can be reduced, simplifying the forming process of the insulating turntable 22. Simultaneously, the second contact 30 and the insulating turntable 22 are linked, and the rotation angle of the insulating turntable 22 can be precisely transmitted to the two second contacts 30, ensuring that the opening and closing actions of the two second contacts 30 are completely synchronized, avoiding the situation where the opening / closing of the second contact 30 on one side is delayed. At the same time, the two second contacts 30 rotate synchronously with the insulating turntable 22, and the contact and separation sequence of the first and second contacts at the two locations is completely unified when opening / closing. The timing of the generation of electric arc on both sides and the introduction of it into the second groove 12 is consistent, and the gas generating elements 50 on both sides are heated and generate gas synchronously. The arc driving airflow is balanced and stable, ensuring that the arc extinguishing effect of the two arc extinguishing channels is uniform and that there is no situation where the arc is stuck on one side or the arc extinguishing performance is unbalanced.

[0106] Please refer to Figure 10 In some embodiments of this application, the linkage mechanism 70 includes a first gear 71 and two second gears 72; the first gear 71 is connected to the insulating turntable 22 and is disposed on the side of the insulating turntable 22 near the bottom of the first groove 11, and the first gear 71 has first tooth segments 711 spaced circumferentially along the first gear 71; the second gears 72 are connected to the second contact 30, and the first tooth segments 711 mesh with the second gears 72.

[0107] This approach further enhances the synchronization between the insulating turntable 22 and the second contact 30, precisely controlling the rotation angle of the second contact 30 and ensuring stable and controllable breaking distance and contact pressure between the first contact 21 and the second contact 30. On the other hand, the first gear 71 only has two tooth segments 711, instead of a complete annular tooth structure. Compared to a full-tooth gear, this significantly reduces metal consumption, effectively lowering the overall weight of the gear and meeting lightweight design requirements. It also reduces manufacturing costs.

[0108] Please refer to Figure 11In some embodiments of this application, the linkage mechanism 70 further includes a second limiting component 80, which includes a rotating member 81 and a limiting member 82. The rotating member 81 is connected to the first gear 71, and in the depth direction of the first groove 11, the rotating member 81 is located between the first gear 71 and the insulating turntable 22. The rotating member 81 has a first sliding groove 811 on the edge of the surface of the insulating turntable 22. In the depth direction of the first groove 11, the limiting member 82 is located between the second gear 72 and the second contact 30. One end of the limiting member 82 is connected to the second gear 72, and the end of the limiting member 82 away from the second gear 72 is embedded in the first sliding groove 811 and can slide along the first sliding groove 811 to limit the rotational stroke of the rotating member 81, the first gear 71 and the insulating turntable 22.

[0109] One end of the limiting member 82 is always embedded in the first sliding groove 811 and slides. The side wall of the first sliding groove 811 can constrain the circumferential range of movement of the limiting member 82 throughout the entire process. It can not only lock the two extreme positions of the rotation of the insulating turntable 22, but also the length of the first sliding groove 811 itself can accurately limit the effective rotation angle of the insulating turntable 22 from closing to opening. Compared with the one-way abutment coarse limiting of the limiting wheel 62, it can greatly improve the stroke control accuracy and accurately control the opening / closing contact distance and breaking gap of the first contact 21 and the second contact 30, ensuring that the opening and closing angles of the two second contacts 30 are highly uniform, and stabilizing the working conditions for arc generation, arc ignition, and gas generation and arc extinguishing.

[0110] Please refer to Figure 5 In some embodiments of this application, the switching device further includes a reset spring 90, which is connected to the second contact 30 and is used to give the second contact 30 a spring force to rotate toward the insulating turntable 22.

[0111] In this way, a force can be continuously applied to the second contact 30 toward the insulating turntable 22, so that the conductive part 31 of the second contact 30 is tightly attached to the first contact 21 when the circuit is closed, thereby increasing the contact pressure, reducing the contact resistance, preventing the contact from overheating and burning when a large current is turned on, and improving the conductivity stability.

[0112] In addition, when there is a small meshing gap or transmission stroke deviation in the gear linkage, the preload of the return spring 90 can compensate for the gap error, ensuring that the first contact 21 and the second contact 30 are always reliably engaged, thus improving the operational stability of the switching device under long-term frequent disconnection conditions.

[0113] Furthermore, the return spring 90 has a simple structure and can be directly assembled onto the insulating base 10 without the need for additional complex transmission parts. It does not occupy the space of the arc-extinguishing chamber 13 or the second groove 12, nor does it interfere with the arc introduction, gas generation, and exhaust processes. In addition, the flexible buffering characteristics of the return spring 90 can absorb the impact of the first contact 21 and the second contact 30 at the moment of closing, reduce the impact loss of the first contact 21 and the second contact 30, and reduce the mechanical noise of the switch during opening / closing.

[0114] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A switching device, characterized in that, Includes an insulating base, a first contact assembly, a second contact, and an arc-extinguishing chamber; The insulating base has a first groove; The first contact assembly is disposed in the first groove and rotatably connected to the insulating base. The first contact assembly includes an insulating turntable and a first contact disposed on the insulating turntable. The second contact is disposed on the insulating base and rotatably connected to the insulating base. The first contact rotates with the insulating turntable and closes or opens with the second contact. The insulating turntable includes a body and an arc-shaped protrusion protruding from the outer peripheral surface of the body. The groove wall of the first groove corresponding to the rotation angle of the first contact during the opening stroke is an arc-extinguishing section. In the opening rotation direction of the first contact, the first gap between the outer peripheral surface of the body and the arc-extinguishing section gradually decreases. In the opening rotation direction of the first contact, the rotating arc-shaped protrusion pushes the second contact to rotate away from the insulating turntable. The arc-extinguishing chamber is disposed on the insulating base and is in communication with the first gap.

2. The switching device according to claim 1, characterized in that, In the opening rotation direction of the first contact, the length of the arc-shaped protrusion gradually increases in the radial direction of the insulating turntable.

3. The switching device according to claim 1 or 2, characterized in that, In the depth direction of the first groove, the arc-shaped protrusion is close to the bottom of the first groove, and the first gap is located above the arc-shaped protrusion.

4. The switching device according to any one of claims 1 to 3, characterized in that, The outer peripheral surface of the body is provided with a first protrusion. In the opening rotation direction of the first contact, the first protrusion is located at the end of the arc-shaped protrusion. The first protrusion, the arc-extinguishing section, the outer peripheral surface of the body, and the arc-shaped protrusion form a receiving space. The receiving space is connected to the arc-extinguishing chamber. The first gap is located in the receiving space.

5. The switching device according to any one of claims 1 to 4, characterized in that, The switching device further includes an arc-inducing piece, the insulating base has a second groove, the second groove connects the first gap and the arc-extinguishing chamber, the arc-inducing piece is disposed in the second groove, and there is a second gap between the arc-inducing piece and the groove wall of the second groove.

6. The switching device according to claim 5, characterized in that, The second groove includes a first groove segment and a second groove segment connected together. The first groove segment communicates with the first groove. In the extending direction of the second groove, the width of the first groove segment decreases as the distance from the second groove segment decreases, and the width of the second groove segment remains the same.

7. The switching device according to claim 5 or 6, characterized in that, One end of the arc-guiding piece extends into the first groove, and in the depth direction of the first groove, the end of the arc-guiding piece located in the first groove is farther away from the bottom of the first groove than the arc-shaped protrusion.

8. The switching device according to any one of claims 5 to 7, characterized in that, The switching device further includes a plurality of arc-extinguishing grids, which are stacked and spaced apart in the arc-extinguishing chamber. The second groove communicates with the arc-extinguishing chamber at one end of the stacking direction of the plurality of arc-extinguishing grids.

9. The switching device according to any one of claims 1 to 8, characterized in that, The second contact includes a conductive part and an insulating rotating part connected together. The conductive part is used to contact the first contact, and the insulating rotating part is rotatably connected to the insulating base. The conductive part rotates with the insulating rotating part to move closer to or away from the first contact.

10. The switching device according to claim 9, characterized in that, The conductive part has a second protrusion. When the first contact and the second contact are closed, the second protrusion contacts the first contact. In the opening rotation direction of the first contact, the second protrusion abuts against the rotating arc-shaped protrusion, so that the second contact rotates away from the insulating turntable.

11. The switching device according to claim 9 or 10, characterized in that, The switching device includes a third groove disposed on the insulating base. In the depth direction of the first groove, the second contact is at least partially located in the third groove. The third groove communicates with the arc-extinguishing chamber. A plurality of arc-extinguishing grids are disposed in the arc-extinguishing chamber. The conductive part has a first end away from the insulating rotating part, and the first end is close to the plurality of arc-extinguishing grids.

12. The switching device according to claim 11, characterized in that, The switching device further includes an exhaust channel and multiple gas generating components, which are disposed on the insulating base. The first end of the conductive part is located between two of the gas generating components. The gas generating components are made of gas generating material. The exhaust channel is opened in the arc-extinguishing chamber and connects the arc-extinguishing chamber to the outside.

13. The switching device according to any one of claims 1 to 12, characterized in that, The first contact has two opposing contact portions, and the switching device has two second contacts. The two second contacts are arranged along the outer periphery of the insulating turntable and are in contact with or separate from the two contact portions, respectively.

14. The switching device according to any one of claims 1 to 13, characterized in that, The switching device further includes a first limiting component, which is used to limit the rotation position of the first contact in the opening rotation direction and to limit the rotation position of the first contact in the closing rotation direction.

15. The switching device according to claim 14, characterized in that, The first limiting component includes a limiting wheel and two limiting blocks; The limiting wheel is connected to the insulating turntable, and the limiting wheel is located on the side of the insulating turntable near the bottom of the first groove. The outer edge of the limiting wheel has a slot, and the outer edge of the limiting wheel away from the slot has an abutment surface. The two limiting blocks are spaced apart along the circumference of the limiting wheel. Each limiting block has a limiting protrusion and each limiting block also has an abutting portion spaced apart from the limiting protrusion along the circumference of the limiting wheel. In the opening rotation direction of the first contact, the limiting protrusion is used to extend into the slot to limit the rotation position of the first contact; In the closing rotation direction of the first contact, the abutting part is used to abut against the abutting surface to limit the rotation position of the first contact.

16. The switching device according to any one of claims 1 to 15, characterized in that, The switching device further includes a linkage mechanism, which is connected to the insulating turntable and the second contact respectively, so that the second contact rotates with the insulating turntable.

17. The switching device according to claim 16, characterized in that, The linkage mechanism includes a first gear and a second gear; The first gear is connected to the insulating turntable, and the first gear is disposed on the side of the insulating turntable near the bottom of the first groove. The first gear has first tooth segments spaced apart along the circumference of the first gear. The second gear is connected to the second contact, and the first tooth segment meshes with the second gear.

18. The switching device according to claim 17, characterized in that, The linkage mechanism further includes a second limiting component, which includes a rotating component and a limiting component; The rotating component is connected to the first gear, and in the depth direction of the first groove, the rotating component is located between the first gear and the insulating turntable. The rotating component has a first sliding groove on the edge of the surface of the insulating turntable. In the depth direction of the first groove, the limiting member is located between the second gear and the second contact. One end of the limiting member is connected to the second gear, and the end of the limiting member away from the second gear is embedded in the first sliding groove and can slide along the first sliding groove to limit the rotational stroke of the rotating member, the first gear and the insulating turntable.

19. The switching device according to any one of claims 1 to 18, characterized in that, The switching device further includes a reset spring connected to the second contact, the reset spring being used to provide a spring force to the second contact to rotate toward the insulating turntable.

20. A power converter, characterized in that, The device includes a power conversion circuit, a housing, and a switching device as described in any one of claims 1 to 19, wherein the switching device is fixed to the housing, the power conversion circuit is located inside the housing, the switching device is used to connect to a DC source and the power conversion circuit, and when the switching device is closed, the DC source supplies power to the power converter, and when the switching device is open, the DC source stops supplying power to the power converter.

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