A load switch and a meter

Abstract

The embodiment of the utility model provides a kind of load switch and electric meter, it is related to electrical equipment technical field.The load switch includes static contact, moving contact, transmission mechanism and elastic part, moving contact has opposite first end and second end, first end is close to static contact;Second end is away from static contact;Second end is equipped with first moving contact point and second moving contact point, and second moving contact point is located between first moving contact point and first end;Transmission mechanism is used to drive moving contact to rotate, to realize the opening or closing of first contact point and second contact point and static contact;Elastic part is set on the rotation path of moving contact, and elastic part is located in the side of moving contact close to static contact;Elastic part is used to make first moving contact point earlier than second moving contact point and static contact closing.It can protect second moving contact point, avoid being arc ablation, ensure long-term use low contact resistance and current-carrying capacity, prolong the service life of load switch.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to a load switch and an electricity meter. Background Technology

[0002] With the rapid development of smart grids, power distribution automation, and new energy applications, load switches, as key actuators in electricity meters and power distribution systems, directly affect metering accuracy, power safety, and system stability. Traditional load switches inevitably generate electric arcs during opening and closing, especially when interrupting current under load.

[0003] However, the high temperature generated by the electric arc can severely burn the surfaces of the moving and stationary contacts of the switch, thus reducing the service life of the load switch. Utility Model Content

[0004] This invention provides a load switch and meter that protects the second moving contact from arc erosion, ensuring low contact resistance and current carrying capacity for long-term use, thus extending the service life of the load switch. It also improves the tripping speed.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a load switch, which includes: Static contact head; A moving contact has a first end and a second end opposite to each other, the first end being away from the stationary contact; the second end being close to the stationary contact; the second end is provided with a first moving contact and a second moving contact, the second moving contact being located between the first moving contact and the first end; A transmission mechanism is provided to drive the moving contact to rotate, so as to realize the opening or closing of the first contact and the second contact with the stationary contact; An elastic element is disposed on the rotation path of the moving contact, and the elastic element is located on the side of the moving contact closer to the stationary contact; the elastic element is used to cause the first moving contact to close with the stationary contact before the second moving contact.

[0006] In an optional embodiment, the elastic element is a spring sheet; the elastic element includes a connecting portion and an abutting portion, the abutting portion being angularly connected to the connecting portion, and the abutting portion being closer to the first moving contact and the second moving contact than the connecting portion.

[0007] In an optional embodiment, the number of abutting portions is multiple, and the multiple abutting portions are arranged parallel to each other and spaced apart along the width direction of the moving contact.

[0008] In an alternative embodiment, the connecting portion and the abutting portion are connected at an obtuse angle; The abutting portion includes a first abutting portion and a second abutting portion, one end of the first abutting portion is connected to the connecting portion, the other end of the first abutting portion is connected to the second abutting portion through an arc, and the second abutting portion is inclined toward a side facing away from the moving contact; when the elastic member is not deformed, the height of the topmost end of the abutting portion is higher than the height of the stationary contact of the stationary contact.

[0009] In an alternative embodiment, the first contact and the second contact are arranged at intervals along the length direction of the moving contact.

[0010] In an alternative embodiment, an arc extinguishing structure is provided on one side of the first moving contact.

[0011] In an alternative embodiment, the load switch further includes a lug structure, the lug structure is provided on a side of the second end facing away from the stationary contact; the transmission mechanism is rotatably connected to the moving contact through the lug structure.

[0012] In an alternative embodiment, the lug structure is provided with a mounting hole, and the transmission mechanism passes through the mounting hole via a first rotating shaft to be rotatably connected to the moving contact.

[0013] In an alternative embodiment, the lug structure is in an inverted T shape, the lug structure includes a first mounting portion and a second mounting portion connected at an angle to each other, the second mounting portion is located between the first mounting portions; the first mounting portion is connected to the moving contact; the second mounting portion is connected to the transmission mechanism.

[0014] In an alternative embodiment, the first end is provided with a second rotating shaft and a shaft hole for the second rotating shaft to pass through; the aperture of the shaft hole is larger than the shaft diameter of the second rotating shaft, so that the second end can perform relative rotation and relative movement relative to the second rotating shaft and / or the shaft hole.

[0015] An embodiment of the present utility model also provides an electricity meter, including the load switch described in any of the above embodiments.

[0016] The beneficial effects of the load switch and the electricity meter according to the embodiment of the present utility model include, for example: The load switch includes a stationary contact, a moving contact, a transmission mechanism, and a resilient element. The moving contact has a first end and a second end, with the first end away from the stationary contact and the second end close to it. The second end has a first moving contact and a second moving contact, with the second moving contact located between the first moving contact and the first end. The transmission mechanism drives the moving contact to rotate, thereby opening or closing the first and second contacts with the stationary contact. The resilient element is disposed on the rotation path of the moving contact and is located on the side of the moving contact closer to the stationary contact. The resilient element ensures that the first moving contact closes with the stationary contact before the second moving contact. By providing the resilient element, before the moving contact contacts the stationary contact during the closing process, the moving contact deforms against the resilient element, thus forming a rotation fulcrum. This ensures that the first moving contact always contacts the stationary contact before the second moving contact and separates from the stationary contact after the second moving contact. Because the elastic element deforms and stores energy during closing, it releases this energy during opening, assisting the moving contact in opening and increasing the opening speed. This design protects the second moving contact from arc erosion, ensuring low contact resistance and current carrying capacity for long-term use, thus extending the service life of the load switch. Furthermore, the elastic element provides an acceleration force to the moving contact during opening, allowing it to quickly separate from the stationary contact. High-speed breaking helps to lengthen and cool the arc, greatly assisting the arc extinguishing process. The arc ignition point is always at the first moving contact, and the fact that the first moving contact is located on the side of the second moving contact furthest from the first end also allows for more space in the load switch to accommodate the arc extinguishing device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a load switch from a first-view perspective provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the load switch from a second perspective provided in an embodiment of the present invention; Figure 3 This is a schematic diagram from a first-view perspective of a load switch with its housing removed, provided in an embodiment of this utility model. Figure 4 This is a schematic diagram from a second perspective of a load switch with the housing removed, provided in an embodiment of this utility model. Figure 5 This is a schematic diagram of the elastic element provided in an embodiment of the present invention.

[0019] Icons: 1000-Load switch; 100-Stationary contact; 200-Moving contact; 210-First end; 211-Shaft hole; 220-Second end; 221-First moving contact; 222-Second moving contact; 300-Transmission mechanism; 400-Elastic element; 410-Connecting part; 420-Abutting part; 421-First abutting part; 422-Second abutting part; 500-Hanging ear structure; 510-Mounting hole; 600-Housing; 700-Arc extinguishing structure; 800-Second rotating shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0026] In today's era of rapid development in smart grids, power distribution automation, and new energy applications, load switches, as key actuators in electricity meters and power distribution systems, directly impact metering accuracy, power safety, and system stability. Traditional load switches inevitably generate electric arcs during opening and closing, especially when interrupting current under load. However, the intense heat generated by the arc can severely erode the surfaces of the switch's moving and stationary contacts, leading to a reduction in the load switch's lifespan.

[0027] Based on this, please refer to Figures 1-4 The load switch 1000 provided in the embodiments of this utility model can effectively improve the aforementioned technology. This load switch 1000 can protect the second moving contact 222 from arc erosion, ensuring low contact resistance and current carrying capacity for long-term use, thus extending the service life of the load switch 1000. It can also improve the tripping speed. This load switch 1000 is applied to electricity meters; all devices with this load switch 1000 have the same functions as described above, and will not be elaborated further here.

[0028] The electricity meter in this embodiment includes a load switch 1000, which is used to switch the power supply circuit in the electricity meter on and off.

[0029] Figure 1 This is a schematic diagram of the load switch 1000 provided in an embodiment of the present invention from a first-view perspective; Figure 2 This is a schematic diagram of the load switch 1000 provided in an embodiment of the present invention from a second perspective. Figure 3 This is a schematic diagram from a first-view perspective of the load switch 1000 with the housing 600 removed, provided in an embodiment of the present invention. Figure 4 This is a schematic diagram from a second perspective of the load switch 1000 with the housing 600 removed, provided in an embodiment of this utility model.

[0030] Please see Figures 1-4In this embodiment, the load switch 1000 includes a stationary contact 100, a moving contact 200, a transmission mechanism 300, and an elastic element 400. The moving contact 200 has a first end 210 and a second end 220 opposite to each other. The first end 210 is away from the stationary contact 100, and the second end 220 is close to the stationary contact 100. The second end 220 is provided with a first moving contact 221 and a second moving contact 222, and the second moving contact 222 is located between the first moving contact 221 and the first end 210. The transmission mechanism 300 is used to drive the moving contact 200 to rotate, so as to realize the opening or closing of the first contact and the second contact with the stationary contact 100. The elastic element 400 is disposed on the rotation path of the moving contact 200, and the elastic element 400 is located on the side of the moving contact 200 closer to the stationary contact 100. The elastic element 400 is used to make the first moving contact 221 close with the stationary contact 100 before the second moving contact 222. By incorporating the elastic element 400, during the closing process, before the moving contact 200 contacts the stationary contact 100, the moving contact 200 deforms against the elastic element 400, thus forming a rotational fulcrum. This ensures that the first moving contact 221 always contacts the stationary contact 100 before the second moving contact 222, and separates from the stationary contact 100 after the second moving contact 222. Furthermore, because the elastic element 400 stores energy during the closing process, it releases energy during the opening process to assist the moving contact 200 in opening, increasing the opening speed. This design protects the second moving contact 222 from arc erosion, ensuring low contact resistance and current carrying capacity for long-term use, and extending the service life of the load switch 1000. In addition, the elastic element 400 can also provide an acceleration force to the moving contact 200 during opening, allowing it to quickly detach from the stationary contact 100. High-speed disconnection helps to lengthen and cool the arc, greatly assisting the arc extinguishing process. Furthermore, the arc ignition point is always at the first moving contact 221, and the fact that the first moving contact 221 is located on the side of the second moving contact 222 away from the first end 210 also allows the load switch 1000 to have more space to install the arc extinguishing device.

[0031] During closing, any arc that may occur will only occur on the first moving contact 221, which is made of an arc-resistant material, such as a copper-tungsten alloy, specifically designed to withstand the high temperatures of an arc. The second moving contact 200 is protected from arc erosion, thus maintaining the flatness and cleanliness of the second moving contact 222, ensuring low contact resistance and current carrying capacity for long-term use. During opening, the sequence is reversed. The transmission mechanism 300 drives the moving contact 200 to rotate, causing the second moving contact 222 to separate first, followed by the first moving contact 221. When the second moving contact 222 separates first, due to its low contact resistance, the circuit current naturally transfers to the still-contacting first moving contact 221. When the first moving contact 221 finally separates, the arc will only occur on it. The arc-extinguishing device will focus on extinguishing the arc on the first moving contact 221, thus protecting the second moving contact 222 from being burned by the opening arc. Because the second moving contact 222 is protected and essentially not subjected to arc erosion, the electrical life of the load switch 1000 is greatly extended. The maintenance cycle of the entire switch is lengthened, and the operational reliability is significantly improved.

[0032] The load switch 1000 in this embodiment also includes a housing 600. A stationary contact 100, a moving contact 200, a transmission mechanism 300, and an elastic element 400 are all disposed within the housing 600. The stationary contact 100 is fixedly connected to the housing 600, and the first end 210 of the moving contact 200 is rotatably connected to the housing 600 via a fixing member. Specifically, the fixing member in this embodiment is U-shaped. The first end 210 of the moving contact 200 is held in place by the fixing member. The fixing member has a shaft hole 211, through which a second rotating shaft 800 passes to connect with the housing 600, thereby achieving a rotatable connection between the fixing member and the housing 600. The fixing member can also be designed with other shapes and structures, which are not limited here. In this embodiment, the fixing member has a connecting hole through which a threaded fastener passes to connect the fixing member to the first end 210 of the moving contact 200. Of course, the fixing member can also be welded to the first end 210 of the moving contact 200, or connected in other ways, which are not limited here.

[0033] Please continue reading. Figures 1-4 In this embodiment, the load switch 1000 also includes a lug structure 500, which is disposed on the side of the second end 220 opposite to the stationary contact 100. The transmission mechanism 300 is rotatably connected to the moving contact 200 via the lug structure 500. By providing the lug structure 500, the connection strength between the transmission mechanism 300 and the moving contact 200 is increased, and efficient and direct force transmission can be achieved, reducing energy loss and improving transmission efficiency. Furthermore, the lug structure 500 can also avoid stress concentration and improve the mechanical life of the load switch 1000. In addition, the lug structure 500 also facilitates the assembly of the transmission mechanism 300 and the moving contact 200.

[0034] Specifically, the lug structure 500 in this embodiment is provided with a mounting hole 510, and the transmission mechanism 300 passes through the mounting hole 510 via a first rotating shaft to be rotatably connected with the moving contact 200. Of course, the transmission mechanism 300 can also pass through the mounting hole 510 via a pin to be rotatably connected with the moving contact 200, which is not limited herein. This design provides a fixed and stable rotation fulcrum for the rotation of the moving contact 200, ensures the accuracy and consistency of the movement track of the moving contact 200 during each closing and opening operation, and can avoid poor contact between contacts, prolonged arcing or mechanical collision caused by shaking or displacement.

[0035] The lug structure 500 in this embodiment is in an inverted T shape, and comprises a first mounting part and a second mounting part which are connected at an angle to each other; the first mounting part is connected with the moving contact 200; the second mounting part is connected with the transmission mechanism 300, and the second mounting part is located between the first mounting parts to ensure the force balance of the moving contact 200 and avoid deflection. The second mounting part is provided with a mounting hole 510, and a connecting rod of the transmission mechanism 300 passes through the mounting hole 510 to be movably connected with the second mounting part.

[0036] Please refer to Figures 1-4 , the first end 210 in this embodiment is provided with a second rotating shaft 800 and a shaft hole 211 for the second rotating shaft 800 to pass through; the aperture of the shaft hole 211 is larger than the shaft diameter of the second rotating shaft 800, so that the second end 220 can perform relative rotation and relative movement with respect to the second rotating shaft 800 and / or the shaft hole 211 to further cooperate with the elastic member 400 to ensure that the first moving contact 221 is closed with the static contact 100 before the second moving contact 222; further, by configuring the aperture of the shaft hole 211 to be larger than the shaft diameter of the second rotating shaft 800, a floating connection structure allowing relative rotation and movement is formed between the first end 210 and the second end 220. This structure can not only effectively absorb and compensate the coaxiality error and dimensional tolerance generated during assembly, reduce the requirements for processing and assembling accuracy of components, thereby saving production costs, but also improve the alignment and contact pressure distribution between moving and static contacts through adaptive fine adjustment during operation, improve contact reliability, reduce arcing wear, and ultimately prolong the service life of the switching device and enhance the stability of its mechanical and electrical properties.

[0037] Please continue to refer to Figures 1-4 , in order to reduce the space required in the width direction of the moving contact 200 and save space in the width direction, the first moving contact 221 and the second moving contact 222 in this embodiment are arranged at intervals along the length direction of the moving contact 200. Of course, the first moving contact 221 and the second moving contact 222 can also be arranged at intervals in other directions, which is determined according to actual use requirements and is not limited herein.

[0038] Optionally, in this embodiment, the first moving contact 221 and the second moving contact 222 are sheet-like or block-like conductors. The sheet-like or block-like structure has a large conductive cross-sectional area, allowing it to handle very large rated currents and short-time fault currents without excessive heat generation due to high current density. The sheet-like or block-like contacts cooperate with the stationary contact 100 to form surface or line contacts, rather than point contacts. The larger contact area allows for the application of greater contact pressure, effectively breaking down the oxide film on the contact surface and reducing contact resistance. Even if there are some ablation marks or slight unevenness on the surface, the large contact area ensures the diversity of current paths, preventing the entire path from being interrupted due to the failure of a single point, resulting in very stable contact resistance.

[0039] Please see Figure 3 In this embodiment, an arc-extinguishing structure 700 is provided on one side of the first moving contact 221. When the moving contact and the stationary contact separate, due to the thermal and electric field effects of the current, the air between the contacts is ionized, forming a high-temperature, high-brightness plasma channel, i.e., an electric arc. The arc temperature is extremely high (reaching thousands to tens of thousands of degrees Celsius), which can ablate, melt, or even weld the contact points, severely reducing the electrical life of the contacts and even causing equipment failure. The arc-extinguishing structure 700 can divide, elongate, and cool a large electric arc into a series of smaller electric arcs, which greatly increases the voltage drop of the electric arc. When the arc voltage drop exceeds the power supply voltage, the electric arc cannot be maintained and quickly extinguishes. The electric arc is usually most intense at the point where the current is last interrupted (i.e., the first moving contact 221 that separates first). By providing an arc-extinguishing structure 700 on one side of the first moving contact 221, the arc can be controlled and extinguished immediately at its source, achieving the most efficient arc extinguishing, thereby greatly improving the switching capability and speed. By rapidly extinguishing the arc, the erosion of the contacts by the arc energy is greatly reduced, thereby protecting the contacts and extending the service life of the load switch 1000.

[0040] Figure 5 This is a schematic diagram of the elastic element 400 provided in an embodiment of this utility model. Please refer to... Figure 5 and combined Figures 1-4In this embodiment, the elastic element 400 is a spring sheet. The elastic element 400 includes a connecting portion 410 and an abutting portion 420. The abutting portion 420 is connected to the connecting portion 410 at an angle. The abutting portion 420 is closer to the first moving contact 221 and the second moving contact 222 than the connecting portion 410, resulting in a higher transmission ratio. Furthermore, the angled connection between the abutting portion 420 and the connecting portion 410 optimizes the deformation direction of the elastic element 400 under force. This ensures that the force applied by the moving contact 200 is most effectively converted into the elastic deformation of the abutting portion 420, rather than causing undesirable lateral bending or twisting of the entire elastic element 400. This reduces energy waste and makes the "energy storage-release" mechanism more efficient. Moreover, this design of the spring sheet concentrates the force on the expected deformation of the abutting portion 420, reducing the risk of metal fatigue and increasing the lifespan of the elastic element 400 itself. Additionally, the abutting portion 420 can also be positioned further away from the moving contact than the connecting portion 410; this is not limited here.

[0041] Of course, the elastic element 400 can also be a spring or other structures, which are not limited here.

[0042] The aforementioned "angled connection between the contact portion 420 and the connecting portion 410" specifically refers to the obtuse angle connection between the connecting portion 410 and the contact portion 420 in this embodiment. At the initial opening stage, the moving contact 200 begins to rotate and presses against the contact portion 420. Due to the obtuse angle connection, at the instant the contact portion 420 contacts the moving contact 200, a more effective mechanical angle is formed between its force direction and the movement direction of the moving contact 200. This angle allows the elastic element 400 to more efficiently convert the kinetic energy of the moving contact 200 into elastic potential energy. Furthermore, the obtuse angle design ensures that the resistance experienced by the moving contact 200 gradually and smoothly increases throughout the entire process from initial contact with the contact portion 420 to its complete compression. This linear, gradual force transmission characteristic reduces impact and vibration, making the closing and opening operations smoother and quieter. Of course, the connecting portion 410 and the contact portion 420 can also be connected at an acute angle or a right angle; this is not limited here.

[0043] Please continue reading. Figure 5 and combined Figures 1-4In this embodiment, the abutment portion 420 includes a first abutment portion 421 and a second abutment portion 422. One end of the first abutment portion 421 is connected to the connecting portion 410, and the other end of the first abutment portion 421 is connected to the second abutment portion 422 by an arc. The second abutment portion 422 is inclined towards the side away from the moving contact 200. When the elastic member 400 does not deform, the height of the highest point of the abutment portion 420 is higher than the height of the stationary contact point of the stationary contact 100. This design facilitates the contact between the moving contact 200 and the elastic member 400 earlier than the contact between the moving contact 200 and the stationary contact 100, ensuring that the first moving contact 221 closes with the stationary contact 100 before the second moving contact 222, and can achieve smooth and gradual force transmission, reducing impact, vibration and noise. Furthermore, the arc connection between the first abutment portion 421 and the second abutment portion 422 avoids stress concentration and improves service life.

[0044] To ensure uniform pressure distribution and prevent the moving contact 200 from deflecting or jamming, please refer to section 2 and... Figure 4 In this embodiment, there are multiple abutment portions 420, which are parallel and spaced apart along the width direction of the moving contact 200. These spaced abutment portions 420 effectively provide multiple evenly distributed support and pressure points along the width direction of the moving contact 200. This ensures that the moving contact 200 experiences balanced forces throughout its movement, resulting in a stable trajectory and rotation around its second axis 800. This avoids problems such as jamming, unstable tilting contact, increased wear, or incomplete closing caused by uneven force. Furthermore, the multiple abutment portions 420 work together to provide uniform and sufficient pre-pressure across the entire width of the moving contact 200. This ensures that during closing, the entire contact surface of the first moving contact 221 can press against the stationary contact 100 almost simultaneously and smoothly. This reliably achieves "first moving contact 221 closing first" across the entire contact width, improving the stability and consistency of contact. Furthermore, the multiple spaced contact portions 420 form multiple support points, which greatly enhances the rigidity and stability of the moving contact 200 system, effectively resisting electrodynamic and mechanical vibrations from various directions and maintaining the stability of the load switch 1000's performance.

[0045] In summary, the load switch 1000 includes a stationary contact 100, a moving contact 200, a transmission mechanism 300, and an elastic element 400. The moving contact 200 has a first end 210 and a second end 220 facing each other. The first end 210 is close to the stationary contact 100; the second end 220 is close to the stationary contact 100 and can rotate around the stationary contact 100 to achieve closing and opening with the stationary contact 100. The second end 220 is provided with a first moving contact 221 and a second moving contact 222. The second moving contact 222 is located between the first moving contact 221 and the first end 210; the transmission mechanism 300 is used to drive the moving contact 200 to rotate, so as to realize the opening or closing of the first and second contacts with the stationary contact 100; the elastic element 400 is disposed on the rotation path of the moving contact 200, and the elastic element 400 is located on the side of the moving contact 200 closer to the stationary contact 100; the elastic element 400 is used to make the first moving contact 221 close with the stationary contact 100 before the second moving contact 222. By setting the elastic element 400, before the moving contact 200 contacts the stationary contact 100 during the closing process, the moving contact 200 will abut and deform against the elastic element 400, so that the elastic element 400 forms a rotation fulcrum. The first moving contact 221 will always contact the stationary contact 100 before the second moving contact 222, and separate from the stationary contact 100 after the second moving contact 222. Furthermore, because the elastic element 400 deforms and stores energy during the closing process, it releases energy during the opening process to assist the moving contact 200 in opening, thus increasing the opening speed. This design protects the second moving contact 222 from arc erosion, ensuring low contact resistance and current carrying capacity for long-term use, and extending the service life of the load switch 1000. In addition, the elastic element 400 can also provide an acceleration force to the moving contact 200 during opening, allowing it to quickly separate from the stationary contact 100. High-speed breaking helps to lengthen and cool the arc, greatly assisting the arc extinguishing process. Moreover, the arc ignition point is always at the first moving contact 221, and the fact that the first moving contact 221 is located on the side of the second moving contact 222 away from the first end 210 also allows for more space in the load switch 1000 to accommodate the arc extinguishing device.

[0046] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A load break switch characterized by, include: Stationary contact (100); A moving contact (200) has a first end (210) and a second end (220) opposite to each other. The first end (210) is away from the stationary contact (100), and the second end (220) is close to the stationary contact (100). The second end (220) is provided with a first moving contact (221) and a second moving contact (222), and the second moving contact (222) is located between the first moving contact (221) and the first end (210). The transmission mechanism (300) is used to drive the moving contact (200) to rotate, so as to realize the opening or closing of the first moving contact (221) and the second moving contact (222) with the stationary contact (100); An elastic element (400) is disposed on the rotation path of the moving contact (200), and the elastic element (400) is located on the side of the moving contact (200) closer to the stationary contact (100); the elastic element (400) is used to make the first moving contact (221) close with the stationary contact (100) before the second moving contact (222).

2. The load break switch according to claim 1, characterized in that The elastic element (400) is a spring sheet; the elastic element (400) includes a connecting part (410) and an abutting part (420), the abutting part (420) is connected to the connecting part (410) at an angle, and the abutting part (420) is closer to the first moving contact (221) and the second moving contact (222) than the connecting part (410).

3. The load break switch according to claim 2, characterized in that The number of abutting parts (420) is multiple, and the multiple abutting parts (420) are arranged parallel to each other and spaced apart along the width direction of the moving contact (200).

4. The load switch according to claim 2, characterized in that, The connecting part (410) and the abutting part (420) are connected at an obtuse angle; The abutting portion (420) includes a first abutting portion (421) and a second abutting portion (422). One end of the first abutting portion (421) is connected to the connecting portion (410), and the other end of the first abutting portion (421) is connected to the second abutting portion (422) by an arc. The second abutting portion (422) is inclined toward the side away from the moving contact (200). When the elastic member (400) does not deform, the height of the top of the abutting portion (420) is higher than the height of the stationary contact point of the stationary contact (100).

5. The load break switch of claim 1, wherein, The first moving contact (221) and the second moving contact (222) are spaced apart along the length of the moving contact (200).

6. The load switch of claim 1, wherein, An arc-extinguishing structure (700) is provided on one side of the first moving contact (221).

7. The load break switch of claim 1, wherein, The load switch (1000) also includes a lug structure (500), which is disposed on the side of the second end (220) away from the stationary contact (100); the transmission mechanism (300) is rotatably connected to the moving contact (200) through the lug structure (500).

8. The load break switch according to claim 7, characterized in that The lug structure (500) is provided with a mounting hole (510), and the transmission mechanism (300) passes through the mounting hole (510) via a first rotating shaft to be rotatably connected with the movable contact (200); the lug structure (500) is in an inverted T shape, the lug structure (500) comprises a first mounting portion and a second mounting portion which are connected at an angle to each other, and the second mounting portion is located between the first mounting portions; the first mounting portion is connected with the movable contact (200); the second mounting portion is connected with the transmission mechanism (300).

9. The load break switch according to any one of claims 1 to 8, characterized in that The first end (210) is provided with a second rotating shaft (800) and a shaft hole (211) for the second rotating shaft (800) to pass through; the aperture of the shaft hole (211) is larger than the shaft diameter of the second rotating shaft (800), so that the second end (220) can perform relative rotation and relative movement with respect to the second rotating shaft (800) and / or the shaft hole (211).

10. An electricity meter characterized by Comprises the load switch (1000) according to any one of claims 1-9.

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