A contact assembly and disconnector

Abstract

The application provides a contact assembly and a disconnecting switch, and belongs to the technical field of electrical equipment. The contact assembly comprises a moving contact and a static contact. The moving contact comprises a first metal sheet, a second metal sheet and a rotating shaft, and the first metal sheet and the second metal sheet have a gap therebetween, and the first metal sheet and the second metal sheet are fixedly connected with the rotating shaft. The static contact comprises a contact end and a contact block, the contact block is fixedly connected with the contact end, and the contact block is provided with a heat dissipation area. The rotating shaft drives the first metal sheet and the second metal sheet to rotate synchronously, and when the disconnecting switch is in a conduction state, the contact block is located in the gap between the first metal sheet and the second metal sheet. According to the scheme, the heat dissipation efficiency of the contact area is significantly improved by arranging the heat dissipation area on the contact block, so that the risk of local overheating is eliminated. While reliable conduction is achieved, the service life of the contact assembly can be prolonged.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a contact assembly and a disconnecting switch. Background Technology

[0002] A disconnecting switch is a widely used switching device in power systems. The core features of a disconnecting switch are that when it is in the open position, the contacts have a specified insulation distance and a clear disconnection mark, and when it is in the closed position, it can carry current under normal circuit conditions as well as current under abnormal conditions for a specified time.

[0003] Disconnecting switches typically include a contact assembly, which consists of a moving contact and a stationary contact. The moving and stationary contacts usually maintain a rotary contact, ensuring that the disconnecting switch will not separate under the influence of Holm force and electrodynamic repulsion when the expected short-circuit current passes through, thus breaking the circuit. However, existing disconnecting switches suffer from excessively high internal temperatures when conducting, which can negatively impact the lifespan of the contact assembly. Utility Model Content

[0004] This application provides a contact assembly and a disconnecting switch to improve the service life of the contact assembly.

[0005] In a first aspect, this application provides a contact assembly for use in a disconnecting switch. The contact assembly includes a moving contact and a stationary contact. The moving contact includes a first metal plate, a second metal plate, and a rotating shaft. A gap exists between the first and second metal plates, and both the first and second metal plates are fixedly connected to the rotating shaft. The stationary contact includes a contact end and a contact block. The contact block is fixedly connected to the contact end and has a heat dissipation area. Rotation of the rotating shaft causes the first and second metal plates to rotate synchronously. The contact block is located on the rotation path of the first and second metal plates. When the disconnecting switch is in the ON state, the contact block is located within the gap between the first and second metal plates, and one sidewall of the contact block contacts the first metal plate, while the other sidewall of the contact block contacts the second metal plate.

[0006] Compared to existing technologies, traditional clip-on moving contacts rely solely on the heat conduction of the metal material itself, while stationary contacts lack an active heat dissipation structure. This solution significantly improves the heat dissipation efficiency of the contact area by incorporating a heat dissipation zone on the contact block. Synchronous rotation of the first and second metal plates reduces the problem of excessive contact pressure on one side of the contact block due to asynchronous movement, thus eliminating the risk of localized overheating. Under continuous energization, the heat dissipation zone of the contact block continuously disperses heat to the surrounding space, preventing heat accumulation and material performance degradation. Furthermore, the mating structure of the contact block with the first and second metal plates not only ensures reliable conductivity but also constructs a three-dimensional heat dissipation channel, extending the service life of the contact assembly.

[0007] In one possible design, the heat dissipation area is a heat dissipation hole opened on the contact block. There are multiple heat dissipation holes.

[0008] With the above scheme, when the disconnecting switch is in the ON state, the contact block is sandwiched between the first and second metal plates, and the heat generated at the contact points on both sides is conducted through the contact block. By opening multiple heat dissipation holes on the contact block, the surface area of ​​the contact block is increased, and heat is quickly dissipated from the hole walls through air convection and thermal radiation. Multiple heat dissipation holes are distributed near the heat-generating areas on both sides of the contact block, forming multiple heat dissipation paths, and heat diffuses along the hole walls to the surrounding environment, preventing heat accumulation inside the contact block. This reduces the operating temperature of the contact block in the ON state, reduces material aging or increased contact resistance caused by heat accumulation, and thus extends the service life of the contact assembly.

[0009] In one possible design, the sidewall of the contact block furthest from the contact end is designated as the first sidewall. Heat dissipation holes are formed on the first sidewall in a direction perpendicular to it.

[0010] With the above solution, the heat dissipation holes are opened on the first sidewall in a direction perpendicular to the first sidewall. This preserves the heat dissipation area of ​​the contact block without reducing the contact area between the first and second metal plates and the contact block. This achieves the goal of ensuring the disconnecting switch has short-term withstand current capability while effectively improving the heat dissipation capacity of the contact assembly. Furthermore, the perpendicularity of the heat dissipation holes to the sidewall avoids cutting the edge structure of the contact block, maintaining the integrity of the contact block in the stress area, and ensuring that it will not break due to weakening of the channels when subjected to the clamping force of the moving contact. This ensures the stable operation of the contact assembly under long-term high-load conditions.

[0011] In one possible design, the heat dissipation area is a heat dissipation groove opened on the contact block.

[0012] With the above solution, when the disconnecting switch is in the ON state, the contact block is inserted into the gap of the moving contact, and the heat generated at the contact points on both sides is conducted through the contact block. The heat dissipation groove divides the contact block into two parts through the groove structure, and the heat can diffuse along the surface of the heat dissipation groove. This can effectively alleviate the problem of temperature accumulation caused by the heating of the contact points on both sides of the stationary contact, improve the thermal stability of the contact assembly under long-term energized conditions, and extend the service life of the equipment.

[0013] In one possible design, the sidewall of the contact block furthest from the contact end is designated as the first sidewall. A heat dissipation groove is formed on the first sidewall in a direction perpendicular to it. The heat dissipation groove extends through the contact block.

[0014] The above-described solution utilizes heat dissipation grooves that penetrate the contact block to reduce internal temperature buildup and prevent localized overheating caused by heat generation at the contact points on both sides. The through-type structure of the heat dissipation grooves enhances the overall heat dissipation efficiency of the contact block, extending the service life of the contact assembly under continuous energization. Rapid heat dissipation from the contact block maintains stable contact pressure at the contact surfaces, preventing poor contact due to thermal expansion.

[0015] In one possible design, a guide ramp is provided on the side of the contact block away from the contact end. The guide ramp guides the first metal sheet and the second metal sheet.

[0016] With the above scheme, when the moving contact begins to rotate, the ends of the first and second metal plates first contact the guide ramp. Guided by the ramp, the moving contact gradually adjusts its posture, causing the contact block to slide along the ramp and eventually enter the gap between the first and second metal plates. During this process, the guide ramp constrains the rotation path of the moving contact within a predetermined range, avoiding jamming or misalignment caused by positional deviation. This improves the alignment accuracy when the moving contact contacts the stationary contact and eliminates poor contact caused by mechanical deviation. Furthermore, the guiding effect of the guide ramp enables a smooth transition during the switching of the disconnecting switch to the conducting state, and also reduces frictional losses between the first and second metal plates and the contact block, extending the service life of the contact assembly.

[0017] In one possible design, the contact block is vertically positioned on the contact end, and the contact block is triangular. There is a non-zero included angle between the first sidewall and the contact end.

[0018] With the above scheme, when the moving contact separates from the stationary contact, an electric arc is generated on the contact block. Because the first sidewall forms an inclined angle with the contact end plane, the arc, under the action of electromagnetic force, can move along the surface of the first sidewall away from the contact end. The triangular contact block structure creates a continuous transition between the first sidewall and the arc-extinguishing chamber entrance of the disconnecting switch, guiding the arc into the arc-extinguishing chamber. During this process, the residence time of the arc on the contact surface is shortened, and the localized heating phenomenon caused by the high temperature of the arc in the contact assembly is suppressed. This further reduces material loss and increased contact resistance in the contact assembly caused by the high temperature of the arc, thereby extending the service life of the contact assembly and improving the electrical stability of the disconnecting switch.

[0019] In one possible design, the stationary contact also includes a terminal block, which is positioned opposite the contact terminal. The terminal block has multiple heat dissipation grooves.

[0020] Through the above solution, this application effectively reduces the local temperature of the terminal of the stationary contact during current transmission, reduces the impact of heat on the performance of the contact material, thereby improving the overall heat dissipation efficiency of the contact assembly and extending its service life.

[0021] In one possible design, the contact block has a notch on the side near the terminal.

[0022] Through the above solution, this application effectively alleviates the problem of heat accumulation at the connection between the contact block and the terminal. The heat dissipation channel formed by the notch enhances the heat dissipation capacity of this area, thereby reducing local temperature rise and minimizing material oxidation or increased contact resistance caused by overheating, ultimately extending the service life of the contact assembly. Furthermore, the notch design can reduce the material volume of the contact block, thus saving on the cost of using the contact assembly.

[0023] Secondly, this application provides a disconnecting switch. The disconnecting switch includes a housing and the contact assembly mentioned in the first aspect. An installation space is provided inside the housing. The contact assembly is disposed within the installation space.

[0024] The beneficial effects of the disconnecting switch provided in the second aspect above can be found in the first aspect and the beneficial effects of various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of the disconnecting switch provided in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the structure of the moving contact provided in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the contact assembly when the disconnecting switch provided in this application is in the ON state.

[0028] Figure 4 This is a schematic diagram of the structure of a first configuration of a stationary contact provided in an embodiment of this application.

[0029] Figure 5 This is a schematic diagram of a second configuration of the stationary contact provided in an embodiment of this application.

[0030] Figure 6 This is a schematic diagram of the contact assembly when the disconnecting switch is in the open state, as provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures: 100. Moving contact; 110. First metal plate; 120. Second metal plate; 130. Rotating shaft; 200. Stationary contact; 210. Contact end; 220. Contact block; 221. Heat dissipation area; 222. Guide slope; 223. Notch; 230. Terminal; 300. Shell. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0035] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0037] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0041] In existing technologies, disconnect switches generally employ a clamp-type moving contact and a stationary contact structure. The moving and stationary contacts achieve circuit continuity through rotational contact. While this contact method can withstand the mechanical stress generated by short-circuit current, in actual operation, the contact points on both sides of the clamp-type moving contact form a concentrated heat source. Because the stationary contact lacks an effective heat dissipation structure, heat continuously accumulates in the contact area, leading to excessively high internal temperatures of the contact assembly. Long-term operation can easily cause material aging, increased contact resistance, and other problems, directly affecting the service life of the equipment.

[0042] To address the aforementioned problems, this application provides an isolating switch. Figure 1 This is a schematic diagram of the internal structure of the disconnecting switch provided in an embodiment of this application. Figure 1 As shown, the disconnecting switch includes a housing 300 and a contact assembly. The housing 300 has an internal mounting space. The contact assembly is disposed within the mounting space.

[0043] The housing 300 refers to a structural component used to encapsulate and protect internal components, and can be manufactured using insulating or metallic materials. For example, the housing 300 can be made of engineering plastics or aluminum alloys.

[0044] The installation space refers to the cavity structure within the housing 300 used to accommodate the contact assembly. The installation space can provide a stable assembly environment for the contact assembly, avoid external interference affecting the contact assembly, and also ensure that the contact assembly remains in a fixed position during operation, reducing the occurrence of poor contact between contact assemblies due to vibration.

[0045] The contact assembly refers to the core component that enables the circuit to be turned on and off. The contact assembly includes a moving contact 100 and a stationary contact 200. The moving contact 100 can use a bimetallic strip structure to clamp the stationary contact 200, so that the contact points of the moving contact 100 and the stationary contact 200 form symmetrical contact.

[0046] The disconnecting switch mentioned in this application can reduce the problem of excessive internal temperature when it is turned on, thereby improving the service life of the contact assembly.

[0047] To enable those skilled in the art to better understand the present application, the contact components mentioned in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0048] Figure 2 This is a schematic diagram of the structure of the moving contact provided in an embodiment of this application. Figure 3 This is a schematic diagram of the contact assembly when the disconnecting switch provided in this application is in the ON state. Figure 2 as well as Figure 3 As shown, the contact assembly mentioned in this application includes a moving contact 100 and a stationary contact 200.

[0049] The moving contact 100 includes a first metal plate 110, a second metal plate 120, and a rotating shaft 130. A gap exists between the first metal plate 110 and the second metal plate 120, and both the first metal plate 110 and the second metal plate 120 are fixedly connected to the rotating shaft 130. The stationary contact 200 includes a contact end 210 and a contact block 220. The contact block 220 is fixedly connected to the contact end 210 and has a heat dissipation area 221.

[0050] The rotating shaft 130 drives the first metal sheet 110 and the second metal sheet 120 to rotate synchronously. The contact block 220 is located on the rotation path of the first metal sheet 110 and the second metal sheet 120. When the disconnecting switch is in the conducting state, the contact block 220 is located in the gap between the first metal sheet 110 and the second metal sheet 120, and one side wall of the contact block 220 is in contact with the first metal sheet 110, and the other side wall of the contact block 220 is in contact with the second metal sheet 120.

[0051] The moving contact 100 is the core actuator in the disconnecting switch that controls the circuit's on / off state. The moving contact 100 mentioned in this application can be a clip-on type. The moving contact 100 includes a first metal plate 110, a second metal plate 120, and a rotating shaft 130. The first metal plate 110 and the second metal plate 120 can pass through the rotating shaft 130 and be fixedly connected to it. The rotating shaft 130 can synchronously drive the first metal plate 110 and the second metal plate 120 to ensure that their movement trajectories are completely consistent. There is a gap between the first metal plate 110 and the second metal plate 120. This gap can be a constant distance maintained between the two plates, specifically achieved by parallel arrangement. This distance must be greater than the thickness of the contact block 220 to ensure no interference when the moving contact 100 contacts the stationary contact 200.

[0052] The stationary contact 200 is a component in electrical equipment used to cooperate with the moving contact 100 to control the circuit's on / off state. The stationary contact 200 includes a terminal 230 and a contact end 210 positioned opposite each other. The terminal 230 can be used for electrical connection with external wires, and the contact end 210 cooperates with the moving contact 100 to connect or disconnect the internal circuit of the disconnecting switch. The contact end 210 is provided with a contact block 220. When the internal circuit of the disconnecting switch is on, the contact block 220 can be located within the gap between the first metal plate 110 and the second metal plate 120. At this time, the contact block 220 is clamped between the first metal plate 110 and the second metal plate 120. The heat dissipation area 221 refers to a specific heat dissipation structure provided on the surface of the contact block 220.

[0053] Specifically, when the rotating shaft 130 drives the first metal plate 110 and the second metal plate 120 to rotate, the contact block 220 enters between the first metal plate 110 and the second metal plate 120 along a predetermined path. The surfaces on both sides of the contact block 220 form surface contact with the first metal plate 110 and the second metal plate 120 respectively, and the contact pressure is evenly transmitted to the contact points on both sides through the torque of the rotating shaft 130. The heat dissipation area 221 provided inside the contact block 220 conducts the heat generated at the contact point through both air convection and heat conduction.

[0054] In summary, compared with existing technologies, the traditional clip-on moving contact 100 relies solely on the heat conduction of the metal material itself, while the stationary contact 200 lacks an active heat dissipation structure. This solution significantly improves the heat dissipation efficiency of the contact area by setting a heat dissipation zone 221 in the contact block 220. The synchronous rotation of the first metal sheet 110 and the second metal sheet 120 reduces the problem of excessive contact pressure on one side of the contact block 220 due to asynchronous movement, thereby eliminating the risk of localized overheating. Under continuous energization, the heat dissipation zone 221 of the contact block 220 continuously disperses heat to the surrounding space, preventing heat accumulation and material performance degradation. Furthermore, the mating structure of the contact block 220 with the first metal sheet 110 and the second metal sheet 120 not only achieves reliable conductivity but also constructs a three-dimensional heat dissipation channel, thus extending the service life of the contact assembly.

[0055] There are several possible configurations for the heat dissipation zone 221. The following description, in conjunction with the attached diagram, will explain two of these configurations in detail.

[0056] Figure 4 A schematic diagram of a first configuration of the stationary contact provided in an embodiment of this application. The first configuration is as follows: Figure 2 as well as Figure 4 As shown, the heat dissipation area 221 can be a heat dissipation hole opened on the contact block 220. And there can be multiple heat dissipation holes.

[0057] The heat dissipation area 221 refers to the area on the surface of the contact block 220 used for heat dissipation. The heat dissipation holes can be perforated structures on the contact block 220, and can be circular or elliptical, etc. The presence of heat dissipation holes increases the contact area between the contact block 220 and the air, promoting heat exchange. There can be one or multiple heat dissipation holes. When there are multiple heat dissipation holes, they can be arranged regularly on the contact block 220, or they can be arranged irregularly.

[0058] When the heat dissipation zone 221 adopts the first configuration, when the disconnecting switch is in the ON state, the contact block 220 is sandwiched between the first metal plate 110 and the second metal plate 120, and the heat generated at the contact points on both sides is conducted through the contact block 220. By opening multiple heat dissipation holes on the contact block 220, the surface area of ​​the contact block 220 is increased, and heat is quickly dissipated from the hole walls through air convection and thermal radiation. Multiple heat dissipation holes are distributed near the heat-generating areas on both sides of the contact block 220, forming multiple heat dissipation paths, and heat diffuses to the surrounding environment along the hole walls, preventing heat from accumulating inside the contact block 220. In this way, the operating temperature of the contact block 220 in the ON state can be reduced, reducing material aging or increased contact resistance caused by heat accumulation, thereby extending the service life of the contact assembly.

[0059] Furthermore, please continue to refer to Figure 2 as well as Figure 4 As shown, the sidewall of the contact block 220 away from the contact end 210 is the first sidewall. Heat dissipation holes are formed on the first sidewall in a direction perpendicular to the first sidewall.

[0060] The first sidewall refers to the surface of the contact block 220 opposite to the contact end 210. The first sidewall can serve as a reference surface for opening the heat dissipation holes, used to determine the extension direction of the heat dissipation channel. The heat dissipation holes are opened in a direction perpendicular to the first sidewall, meaning that the axis of the hole is orthogonal to the plane containing the first sidewall. This can be achieved through drilling or stamping processes. This direction ensures that the heat dissipation holes form a straight channel when passing through the contact block 220, reducing airflow resistance.

[0061] Through the above technical solution, the heat dissipation holes are opened on the first sidewall in a direction perpendicular to the first sidewall. This preserves the heat dissipation area of ​​the contact block 220 without reducing the contact area between the first metal sheet 110 and the second metal sheet 120 and the contact block 220. This achieves the goal of ensuring the disconnecting switch has short-term withstand current capability while effectively improving the heat dissipation capacity of the contact assembly. Furthermore, the perpendicular opening of the heat dissipation holes to the sidewall avoids cutting the edge structure of the contact block 220, maintaining the integrity of the contact block 220 in the stress area, ensuring that it will not break due to weakening of the channels when subjected to the clamping force of the moving contact 100, and ensuring the stable operation of the contact assembly under long-term high-load conditions.

[0062] Figure 5 This is a schematic diagram illustrating a second configuration of the stationary contact provided in an embodiment of this application. The second configuration is as follows... Figure 2 as well as Figure 5 As shown, the heat dissipation area 221 can be a heat dissipation groove opened on the contact block 220.

[0063] The heat dissipation groove can be a strip-shaped groove structure machined on the surface of the contact block 220. Specifically, it can be achieved by milling or stamping. The heat dissipation groove can increase the contact area between the contact block 220 and the air.

[0064] When the heat dissipation zone 221 adopts the second configuration, when the disconnecting switch is in the conducting state, the contact block 220 is inserted into the gap of the moving contact 100, and the heat generated by the contact points on both sides is conducted through the contact block 220. The heat dissipation groove divides the contact block 220 into two parts through the groove structure, and the heat can diffuse along the surface of the heat dissipation groove. This can effectively alleviate the problem of temperature accumulation caused by the heating of the contact points on both sides of the stationary contact 200, improve the thermal stability of the contact assembly under long-term energized conditions, and extend the service life of the equipment.

[0065] Furthermore, please continue to refer to Figure 2 as well as Figure 5 As shown, the heat dissipation groove is formed on the first sidewall in a direction perpendicular to the first sidewall. The heat dissipation groove passes through the contact block 220.

[0066] The first sidewall has been described above and will not be repeated here. The heat dissipation groove can be a groove structure extending along the first sidewall to the contact end 210. The heat dissipation groove penetrating the contact block 220 means that the contact block 220 is divided into two independent parts by the setting of the heat dissipation groove. When the contact block 220 is divided into two parts, these two parts are still connected to the contact end 210, so as not to affect the normal use of the contact assembly.

[0067] Through the above technical solution, the heat dissipation grooves provided through the contact block 220 can reduce the temperature accumulation inside the contact block 220 and avoid local overheating caused by heat generation at the contact points on both sides. The through-type structure of the heat dissipation grooves enhances the overall heat dissipation efficiency of the contact block 220 and extends the service life of the contact assembly under continuous energization. The rapid dissipation of heat from the contact block 220 can maintain stable contact pressure on the contact surface and prevent poor contact problems caused by thermal expansion.

[0068] As described above, compared with the prior art, the stationary contact 200 in traditional contact assemblies typically adopts a solid metal block structure, and the heat in the contact area is dissipated only through natural surface heat dissipation, resulting in low heat dissipation efficiency. This application, however, improves the overall heat dissipation capacity of the contact block 220 by setting a heat dissipation zone 221 inside the contact block 220 and accelerating heat exchange through airflow.

[0069] like Figures 2 to 5 As shown, in order to improve the reliability of the contact assembly, this application further proposes that the contact block 220 has a guide slope 222 on the side away from the contact end 210. The guide slope 222 guides the first metal sheet 110 and the second metal sheet 120.

[0070] The side of the contact block 220 away from the contact end 210 refers to the end of the contact block 220 opposite to the contact end 210, that is, the area of ​​the contact block 220 close to the first sidewall. This area serves as the initial contact point between the moving contact 100 and the contact block 220, and its structure directly affects the smoothness of the contact process.

[0071] The guide ramp 222 refers to the inclined surface of the contact block 220 away from the contact end 210. It can be implemented using a planar or curved surface structure. The inclination angle of the guide ramp 222 can be adjusted according to the rotation trajectory of the moving contact 100. This ramp guides the first metal plate 110 and the second metal plate 120 of the moving contact 100 to move in a predetermined direction through its geometric shape, which can reduce the mechanical impact at the moment of contact between the moving contact 100 and the stationary contact 200.

[0072] Through the above technical solution, when the moving contact 100 begins to rotate, the ends of the first metal plate 110 and the second metal plate 120 first contact the guide slope 222. Guided by the slope, the moving contact 100 gradually adjusts its posture, causing the contact block 220 to slide along the slope and eventually enter the gap between the first metal plate 110 and the second metal plate 120. During this process, the guide slope 222 constrains the rotation path of the moving contact 100 within a predetermined range, avoiding jamming or misalignment caused by positional deviation. This improves the alignment accuracy when the moving contact 100 contacts the stationary contact 200, eliminating poor contact caused by mechanical deviation. Furthermore, the guiding effect of the guide slope 222 enables a smooth transition during the switching of the disconnecting switch to the conducting state, and also reduces frictional losses between the first metal plate 110, the second metal plate 120, and the contact block 220, extending the service life of the contact assembly.

[0073] Figure 6 This is a schematic diagram of the contact assembly when the disconnecting switch provided in this application is in the open state. Figure 6 As shown, in some possible embodiments, the contact block 220 is vertically disposed on the contact end 210, and the contact block 220 is triangular. There is a non-zero included angle between the first sidewall and the contact end 210.

[0074] The contact block 220 is vertically disposed on the contact end 210, which means that the connection surface of the contact block 220 and the contact end 210 forms a right angle. This can be achieved by welding or integral molding process. This structure can enhance the mechanical stability between the contact block 220 and the contact end 210.

[0075] The contact block 220 being triangular means that its cross-section has a geometric shape with three closed sides. The vertices of the triangle form a guide slope 222, providing a path for the arc to move. When the contact block 220 is triangular, there is a non-zero angle between the first sidewall and the contact end 210. At this time, the first sidewall is inclined relative to the plane of the contact end 210. This arrangement allows the arc to move along the sidewall surface towards the arc-extinguishing chamber of the disconnecting switch when the contacts separate.

[0076] Through the above technical solution, when the moving contact 100 separates from the stationary contact 200, an electric arc is generated on the contact block 220. Because the first sidewall forms an inclined angle with the plane of the contact end 210, the arc can move along the surface of the first sidewall away from the contact end 210 under the action of electromagnetic force. The triangular structure of the contact block 220 creates a continuous transition between the first sidewall and the entrance of the arc-extinguishing chamber of the disconnecting switch, guiding the arc into the arc-extinguishing chamber. During this process, the residence time of the arc on the contact surface is shortened, and the localized heating phenomenon caused by the high temperature of the arc in the contact assembly is suppressed. This further reduces material loss and increased contact resistance in the contact assembly caused by the high temperature of the arc, thereby extending the service life of the contact assembly and improving the electrical stability of the disconnecting switch.

[0077] To reduce the temperature rise of the contact assembly, such as Figures 3 to 5 As shown, this application also provides multiple heat dissipation slots on the terminal 230.

[0078] Terminal 230 refers to the structure that is arranged opposite to contact terminal 210 and used to connect external conductors. Terminal 230 and contact terminal 210 can form the two ends of a current transmission path, and undertake the functions of conduction and heat conduction when current flows through them.

[0079] A heat dissipation groove refers to a groove structure formed on the surface of the terminal 230. It can be implemented in the form of a strip, wave, or grid. By increasing the surface area, it promotes the diffusion of heat to the surrounding environment and reduces local temperature rise.

[0080] Specifically, when current flows through terminal 230, Joule heating is generated due to the resistance of the conductor material, and heat accumulates on the surface of terminal 230. The heat sink increases the contact area between terminal 230 and the air, accelerating heat dissipation through convection and radiation. For example, the heat sink can be evenly distributed along the length of terminal 230, forming a continuous heat dissipation channel, allowing heat to be quickly transferred to the external space along the surface of the sink.

[0081] Compared to existing technologies, traditional disconnectors typically employ a solid structure for their stationary contact 200 and terminal 230, relying solely on the material's own thermal conduction for heat dissipation, which can lead to heat accumulation in localized areas. This solution addresses this by adding heat dissipation grooves, optimizing the heat dissipation path while maintaining conductivity, resulting in more even heat distribution and preventing material oxidation or decreased mechanical strength due to excessive temperature rise.

[0082] Through the above technical solution, this application effectively reduces the local temperature of the terminal 230 of the stationary contact 200 during current transmission, reduces the impact of heat on the performance of the contact material, thereby improving the overall heat dissipation efficiency of the contact assembly and extending its service life.

[0083] like Figure 6As shown, a notch 223 may be provided on the side of the contact block 220 near the terminal 230.

[0084] Notch 223 refers to the recessed area formed on the side of the contact block 220 near the terminal 230. The shape of notch 223 can be rectangular, arc-shaped, or trapezoidal, etc., and the size of notch 223 can be adjusted according to the spatial layout of the connection area between the contact block 220 and the terminal 230. The function of notch 223 is to reduce the material volume at the junction of the contact block 220 and the terminal 230, thereby reducing the thermal conductivity resistance in this area and providing additional surface area for heat dissipation.

[0085] Through the above technical solution, this application effectively alleviates the problem of heat accumulation at the connection between the contact block 220 and the terminal 230. The heat dissipation channel formed by the notch 223 enhances the heat dissipation capacity of this area, thereby reducing local temperature rise, reducing material oxidation or increased contact resistance caused by overheating, and ultimately extending the service life of the contact assembly. Furthermore, the notch 223 can also reduce the material volume of the contact block 220, thus saving on the cost of using the contact assembly.

Claims

1. A contact assembly used in a disconnecting switch, characterized in that, The contact assembly includes: The moving contact includes a first metal plate, a second metal plate, and a rotating shaft. There is a gap between the first metal plate and the second metal plate. Both the first metal plate and the second metal plate are fixedly connected to the rotating shaft. A stationary contact includes a contact end and a contact block, wherein the contact block is fixedly connected to the contact end, and the contact block is provided with a heat dissipation area; The rotating shaft drives the first metal sheet and the second metal sheet to rotate synchronously. The contact block is located on the rotation path of the first metal sheet and the second metal sheet. When the disconnecting switch is in the conducting state, the contact block is located in the gap between the first metal sheet and the second metal sheet, and one side wall of the contact block is in contact with the first metal sheet, and the other side wall of the contact block is in contact with the second metal sheet.

2. The contact assembly according to claim 1, characterized in that, The heat dissipation area is the heat dissipation hole opened on the contact block; There are multiple heat dissipation holes.

3. The contact assembly according to claim 2, characterized in that, The sidewall of the contact block away from the contact end is the first sidewall; The heat dissipation holes are formed on the first sidewall in a direction perpendicular to the first sidewall.

4. The contact assembly according to claim 1, characterized in that, The heat dissipation area is a heat dissipation groove opened on the contact block.

5. The contact assembly according to claim 4, characterized in that, The sidewall of the contact block away from the contact end is the first sidewall; The heat dissipation groove is formed on the first sidewall in a direction perpendicular to the first sidewall; The heat dissipation groove extends through the contact block.

6. The contact assembly according to any one of claims 1-4, characterized in that, The contact block has a guide slope on the side away from the contact end; The guide ramp guides the first metal sheet and the second metal sheet.

7. The contact assembly according to claim 3 or 5, characterized in that, The contact block is vertically disposed on the contact end, and the contact block is triangular. There is a non-zero included angle between the first sidewall and the contact end.

8. The contact assembly according to claim 1, characterized in that, The stationary contact also includes a wiring terminal, which is positioned opposite to the contact terminal. The terminal block is equipped with multiple heat dissipation slots.

9. The contact assembly according to claim 8, characterized in that, The contact block has a notch on the side near the terminal.

10. A disconnecting switch, characterized in that, Includes a housing and a contact assembly as described in any one of claims 1 to 9; The housing has an installation space inside; The contact assembly is disposed within the installation space.

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