Arc extinguishing mechanism of load switch

Abstract

The utility model relates to the field of power equipment, and particularly discloses an arc extinguishing mechanism of a load switch, the arc extinguishing mechanism comprises a cylinder and a control rod, the cylinder comprises an upper cover and a base, the control rod penetrates through the base, the outer wall of the control rod is connected with a moving contact, the inner side wall of the base is connected with a grounding piece, and the grounding piece is connected with the upper cover. Static contacts are fixedly connected in the upper cover and the base, a partition plate is arranged between every two adjacent static contacts, a fixing plate is connected to the side wall of the partition plate in the upper cover, the fixing plate is perpendicular to the partition plate, and an arc chute is arranged on the side, close to the static contacts, of the fixing plate. And the side wall of the cylinder body is provided with an air inlet hole for the insulation gas to enter. The arc extinguishing mechanism of the load switch has the effect of accelerating arc extinguishing.

Description

Technical Field

[0001] This application relates to the field of power equipment, and in particular to an arc-extinguishing mechanism for a load switch. Background Technology

[0002] A load switch is an important switching device used to connect or disconnect a power distribution system. When disconnecting a circuit, the user only needs to use the operating mechanism to rotate the control lever to disconnect the connection between the moving contact and the stationary contact inside the load switch.

[0003] Existing load switches generally achieve arc extinguishing by filling the arc-extinguishing chamber with insulating gas, but significant flashover can still be generated during the opening and closing process, posing a safety hazard. Utility Model Content

[0004] In order to accelerate the extinction of electric arc during the opening and closing of load switches, this application provides an arc extinguishing mechanism for load switches.

[0005] The arc-extinguishing mechanism of a load switch provided in this application adopts the following technical solution:

[0006] An arc-extinguishing mechanism for a load switch includes a cylinder and a control rod. The cylinder includes a top cover and a base. The control rod passes through the base and has a moving contact connected to its outer wall. A grounding plate is connected to the inner side wall of the base. Stationary contacts are fixedly connected to both the top cover and the base. A partition plate is provided between adjacent stationary contacts. A fixing plate is connected to the side wall of the partition plate inside the top cover. The fixing plate is perpendicular to the partition plate. An arc-extinguishing grid is provided on the side of the fixing plate near the stationary contact. An air inlet is provided on the side wall of the cylinder for insulating gas to enter.

[0007] By employing the above technical solution, rotating the control lever allows the moving and stationary contacts to close and open, thereby connecting and disconnecting the circuit. The partition plate effectively reduces interference caused by electromagnetic coupling between adjacent circuits during current flow, preventing arcing and ensuring current stability and operational safety. Insulating gas enters the cylinder through the inlet, allowing the load switch to operate in an environment filled with insulating gas. This effectively reduces the generation of arcs during operation, lowers the risk of arc reignition, ensures safety during operation, and improves equipment stability.

[0008] Optionally, the arc-extinguishing grid has a guide hole on the side near the stationary contact, and guide portions are located on both sides of the guide hole.

[0009] By adopting the above technical solution, the arc-extinguishing grid can effectively divide the electric arc during the opening and closing process, thereby effectively improving the arc-extinguishing efficiency. The guide hole and guide part work together to ensure that the electric arc can be effectively guided into the arc-extinguishing grid, thereby ensuring the arc-extinguishing efficiency of the arc-extinguishing grid, protecting the safe operation of the circuit, and improving the safety of the equipment.

[0010] Optionally, the spacing between the arc-extinguishing grids gradually increases towards the side closer to the top wall of the upper cover.

[0011] By adopting the above technical solution, the small gap near the stationary contact end allows the arc to be effectively divided by the arc-extinguishing grid, dividing the high-energy arc into multiple short arcs, thereby reducing the arc's existence time and accelerating its extinction; the subsequent larger gap further lengthens the arc path, enabling faster cooling, reducing the arc temperature, thereby increasing the arc resistance and accelerating the arc's extinction.

[0012] Optionally, the control rod is circumferentially connected to a positioning plate, and the positioning plate has a positioning groove for engaging the partition plate.

[0013] By adopting the above technical solution, the positioning plate and positioning groove enable the control rod to be effectively positioned during rotation; the positioning plate, together with the partition plate, effectively separates adjacent circuits, thereby reducing interference between adjacent circuits and improving the stability of circuit operation.

[0014] Optionally, a limiting post is fixedly connected to the side wall of the partition plate of the upper cover, and the control rod is provided with a limiting groove for the limiting post to abut against.

[0015] By adopting the above technical solution, when the control rod rotates to a certain angle, the limit post can be locked into the limit groove, thereby preventing the control rod from continuing to rotate. At this time, it enters the grounding state, thus preventing the circuit from closing due to excessive rotation of the control rod and improving the stability during use.

[0016] Optionally, a reinforcing rib is provided between the limiting groove and the positioning plate.

[0017] By adopting the above technical solution, the reinforcing ribs effectively enhance the structural strength of the limiting groove and the positioning plate, making it less likely for the limiting groove to be damaged due to excessive collision force when it comes into contact with the limiting post, thus ensuring the stability during use.

[0018] Optionally, the air inlet is fixedly connected to a one-way valve.

[0019] By adopting the above technical solution, the one-way valve allows insulating gas to flow into the cylinder in only one direction. When the pressure inside the cylinder is greater than that of the outside air, the one-way valve will close, thus preventing outside air from flowing into the cylinder. This ensures that the load switch is always surrounded by insulating gas during the opening and closing process, thereby improving the arc extinguishing efficiency.

[0020] Optionally, the inner wall of the base is provided with a sealing gasket, and the upper cover is provided with a receiving groove for placing the sealing gasket in the circumferential direction.

[0021] By adopting the above technical solution, the sealing gasket effectively improves the sealing performance of the cylinder, thereby preventing the leakage of insulating gas inside the cylinder and ensuring the arc extinguishing efficiency during product use.

[0022] In summary, this application has the following beneficial effects:

[0023] 1. By setting up an air inlet and a cylinder, the cylinder can be filled with insulating gas, which can effectively reduce the probability of electric arc generation when the load switch is opened and closed, thereby improving the safety during operation.

[0024] 2. By setting up an arc-extinguishing grid and a guide hole, an electric arc is generated instantly during the opening and closing process. The electric arc can also be effectively guided into the arc-extinguishing grid for cutting, thereby accelerating the extinction of the electric arc and improving safety during use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the arc-extinguishing mechanism of the load switch according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the internal structure of the base according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the internal structure of the upper cover according to an embodiment of this application;

[0028] Figure 4 This is a cross-sectional view of the top cover according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Cylinder body; 11. Top cover; 111. Fixing plate; 112. Receiving groove; 12. Base; 121. Sealing gasket; 13. Grounding plate; 14. Stationary contact; 15. Partition plate; 151. Limiting post; 16. Arc extinguishing grid; 161. Guide hole; 162. Guide part; 17. Air inlet; 2. Control rod; 21. Moving contact; 22. Positioning plate; 221. Positioning groove; 23. Limiting groove; 24. Reinforcing rib; 3. One-way valve. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0031] This application discloses an arc-extinguishing mechanism for a load switch. (Refer to...) Figure 1 , Figure 2 and Figure 3The arc-extinguishing mechanism of the load switch includes a cylinder 1 and a control rod 2 disposed inside the cylinder 1 for controlling the circuit connection. The cylinder 1 includes a top cover 11 and a base 12. A grounding plate 13 is connected to the inner side wall of the base 12. Stationary contacts 14 are fixedly connected inside both the base 12 and the top cover 11. Two moving contacts 21 are circumferentially connected to the control rod 2. In use, by rotating the control rod 2, the moving contacts 21 on the control rod 2 come into contact with the stationary contacts 14 or the grounding plate 13, thereby realizing the connection and disconnection of the circuit.

[0032] Reference Figure 1 , Figure 2 and Figure 3 The cylinder 1 has an inlet 17 on its side wall for insulating gas to enter. The insulating gas can be sulfur hexafluoride, nitrogen, or fluorinated nitriles, etc. A one-way valve 3 is installed inside the inlet 17. By filling the cylinder 1 with insulating gas, it is less likely to generate an electric arc when the load switch is opened and closed, reducing the risk of arc reignition and ensuring safety during the opening and closing process, thus improving the stability of the equipment. The one-way valve 3 ensures that the insulating gas can only flow into the cylinder 1 in one direction. When the pressure inside the cylinder 1 is greater than that outside, the one-way valve 3 will close, preventing outside air from flowing into the cylinder 1. This ensures that the load switch is always surrounded by insulating gas during the opening and closing process, improving arc extinguishing efficiency.

[0033] Reference Figure 2 , Figure 3 A sealing gasket 121 is provided on the side of the base 12 near the top cover 11, and the top cover 11 has a receiving groove 112 for placing the sealing gasket 121. When the base 12 and the top cover 11 are closed, the sealing gasket 121 will enter the receiving groove 112, thereby effectively filling the gap between the top cover 11 and the base 12, improving the airtightness of the cylinder 1, preventing the leakage of insulating gas, and ensuring the arc extinguishing efficiency during product use.

[0034] Reference Figure 2 , Figure 3 A partition plate 15 is provided between adjacent stationary contacts 14 inside the base 12 and the top cover 11. The partition plate 15 effectively reduces the interference caused by electromagnetic coupling between adjacent circuits during current flow, avoids arc interference, and thus ensures current stability, thereby ensuring safety during the rotation of the control lever 2.

[0035] Reference Figure 2 , Figure 3A fixing plate 111 is fixedly connected to the side wall of the partition plate 15 of the upper cover 11. The fixing plate 111 is vertically arranged on the partition plate 15. An arc-extinguishing grid 16 is provided on the side of the fixing plate 111 near the stationary contact 14. A guide hole 161 is opened on the side of the arc-extinguishing grid 16 near the stationary contact 14. Guide parts 162 are located on both sides of the guide hole 161 and distributed on both sides of the stationary contact 14. During the opening and closing process, the arc-extinguishing grid 16 can effectively divide the arc, making the arc divided into multiple short arcs, accelerating the extinguishing of the arc, and thus effectively improving the arc-extinguishing efficiency. The guide hole 161 and the guide parts 162 can effectively guide the arc on the stationary contact 14 into the arc-extinguishing grid 16, thereby ensuring that the arc is effectively divided by the arc-extinguishing grid 16, protecting the safe operation of the circuit, and improving the safety of equipment use.

[0036] Reference Figure 4 The spacing of the arc-extinguishing grid 16 gradually increases towards the top wall of the upper cover 11. After the arc is guided to the arc-extinguishing grid 16, the smaller spacing can effectively divide the arc into multiple short arcs, thereby reducing the arc's existence time and accelerating its extinction; the larger spacing further lengthens the arc path, thereby achieving faster cooling, reducing the arc temperature, and accelerating the arc's extinction.

[0037] Reference Figure 1 , Figure 2 The control rod 2 has a positioning plate 22 connected to its outer wall. The positioning plate 22 has a positioning groove 221 for engaging with the partition plate 15. This allows the control rod 2 to be effectively positioned during rotation, and the positioning plate 22, together with the partition plate 15, can effectively separate adjacent circuits, thereby reducing interference between adjacent circuits and improving the stability of circuit operation.

[0038] Reference Figure 2 , Figure 3 and Figure 4 A limiting post 151 is fixedly connected to the side wall of the partition plate 15 of the upper cover 11. The limiting post 151 extends towards the base 12. The control rod 2 is provided with a limiting groove 23 for one end of the limiting post 151 to abut against. When the control rod 2 is rotated to a certain angle, the limiting post 151 will insert into the limiting groove 23 and abut against the limiting groove 23, preventing the control rod 2 from continuing to rotate, thereby limiting the rotation angle and improving the stability of the equipment.

[0039] Reference Figure 2 A reinforcing rib 24 is provided between the limiting groove 23 and the positioning plate 22. The reinforcing rib 24 connects the limiting groove 23 and the side wall of the positioning plate 22, thereby effectively enhancing the structural strength of the limiting groove 23 and the positioning plate 22. This ensures that the limiting groove 23 will not be damaged by excessive impact force from the limiting post 151 when the control rod 2 rotates rapidly, thus improving the stability of the product.

[0040] The implementation principle of the arc extinguishing mechanism of a load switch in this application embodiment is as follows: the upper cover 11 is connected to the base 12, and insulating gas is introduced into the cylinder 1 through the air inlet 17 until the pressure inside the cylinder 1 is greater than the external pressure. Then, the switch is opened and closed by rotating the control rod 2. During the opening and closing, the arc extinguishing grid 16 on the fixed plate 111 can effectively cut off the arc. With the help of the insulating gas, the arc extinguishing time is greatly accelerated, thereby improving the arc extinguishing efficiency. The partition plate 15 and the positioning plate 22 work together to effectively reduce the interference caused by electromagnetic coupling between adjacent circuits and ensure stable circuit operation.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An arc-extinguishing mechanism for a load switch, comprising a cylinder (1) and a control rod (2), characterized in that: The cylinder (1) includes a top cover (11) and a base (12). The control rod (2) passes through the base (12). A moving contact (21) is connected to the outer wall of the control rod (2). A grounding plate (13) is connected to the inner side wall of the base (12). A stationary contact (14) is fixedly connected inside both the top cover (11) and the base (12). A partition plate (15) is provided between adjacent stationary contacts (14). A fixing plate (111) is connected to the side wall of the partition plate (15) inside the top cover (11). The fixing plate (111) is set perpendicular to the partition plate (15). An arc-extinguishing grid (16) is provided on the side of the fixing plate (111) near the stationary contact (14). An air inlet (17) is opened on the side wall of the cylinder (1) for insulating gas to enter.

2. The arc-extinguishing mechanism of the load switch according to claim 1, characterized in that: The arc-extinguishing grid (16) has a guide hole (161) on the side near the stationary contact (14), and guide portions (162) are located on both sides of the guide hole (161). The guide portions (162) are distributed on both sides of the stationary contact (14).

3. The arc-extinguishing mechanism of the load switch according to claim 1, characterized in that: The spacing between the arc-extinguishing grids (16) gradually increases toward the side closer to the top wall of the upper cover (11).

4. The arc-extinguishing mechanism of the load switch according to claim 1, characterized in that: The control rod (2) is circumferentially connected to a positioning plate (22), and the positioning plate (22) has a positioning groove (221) for engaging the partition plate (15).

5. The arc-extinguishing mechanism of the load switch according to claim 4, characterized in that: The partition plate (15) of the upper cover (11) is fixedly connected to the side wall of the limit post (151), and the control rod (2) is provided with a limit groove (23) for the limit post (151) to abut.

6. The arc-extinguishing mechanism of the load switch according to claim 5, characterized in that: A reinforcing rib (24) is provided between the limiting groove (23) and the positioning plate (22).

7. The arc-extinguishing mechanism of the load switch according to claim 1, characterized in that: The air inlet (17) is fixedly connected to a one-way valve (3).

8. The arc-extinguishing mechanism of the load switch according to claim 1, characterized in that: The inner wall of the base (12) is provided with a sealing gasket (121), and the upper cover (11) is provided with a receiving groove (112) for placing the sealing gasket (121) in the circumferential direction.

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