An environmental protection type load switch suitable for 24kV and below

Abstract

The application discloses an environment-friendly load switch suitable for 24kV and below, which comprises a static knife head, a dynamic knife assembly, a dynamic knife seat and an arc extinguishing unit. One end of the dynamic knife assembly is hinged to the dynamic knife seat, and the other end realizes on-off electric connection with the static knife head. The arc extinguishing unit comprises an arc extinguishing chamber, a connecting sleeve and an arc extinguishing driving device. The arc extinguishing chamber comprises a static contact and a dynamic contact. The static contact is fixedly connected with the connecting sleeve, the connecting sleeve is sleeved outside the static knife head, and the dynamic contact is fixedly connected with the arc extinguishing driving device. The arc extinguishing driving device comprises a driving box, a connecting rod mechanism and an insulating lever hinged to the driving box. A driving guide groove is arranged on the driving box. The connecting rod mechanism is hinged between the dynamic contact of the arc extinguishing chamber and the outer wall of the arc extinguishing chamber. A dynamic pin of the connecting rod mechanism moves along the driving guide groove. The current of an active load and the like is transferred to the arc extinguishing chamber to realize conduction by the knife switch, and further, the arc extinguishing is realized by driving the dynamic end of the arc extinguishing chamber to move through the transmission mechanism. The arc extinguishing does not need any SF6 gas, and is an environment-friendly switch device.

Description

Technical Field

[0001] This invention relates to medium-voltage switchgear, specifically to an environmentally friendly load switch suitable for 24kV and below. Background Technology

[0002] Existing load switches typically use SF6 gas for arc extinguishing. However, this method is prone to problems if SF6 gas leaks, leading not only to reduced insulation levels between components and safety issues but also to environmental pollution. Furthermore, SF6 gas has a significant greenhouse effect, and load switches using SF6 as both the arc extinguishing and insulating medium do not meet environmental protection requirements. If traditional SF6 equipment is replaced with C4, dry air, or other non-greenhouse gas insulating media without significant dimensional adjustments, the arc extinguishing and insulation conditions will not meet the requirements. Current technologies using SF6 load switches extinguish arcs by introducing the arc during the breaking process into prefabricated arc-extinguishing grids to cut off the arc and achieve an arc break. Other existing technologies employ parallel arc extinguishing techniques, using structural coordination to link a three-position disconnector with a vacuum interrupter, thereby guiding the arc to the vacuum interrupter for extinguishing.

[0003] In existing technologies, load switches with partially parallel arc-extinguishing structures achieve the movement of the arc-extinguishing chamber contacts through mechanical lever connections. Each adjustment of the relative position of the arc-extinguishing chamber's contact point is necessary to ensure its movement trajectory, making the actual production process relatively complex. Furthermore, the core components of existing load switches have a low modularity rate, requiring relatively complex assembly to achieve the specified positions, thus placing high demands on the assembly process. Summary of the Invention

[0004] Purpose of the invention: To address the above-mentioned shortcomings, this invention provides an environmentally friendly load switch with good insulation and processability, suitable for 24kV and below.

[0005] Technical Solution: To solve the above problems, the present invention adopts an environmentally friendly load switch suitable for 24kV and below, including a stationary knife head, a moving knife assembly, a moving knife base, and an arc-extinguishing unit. One end of the moving knife assembly is hinged to the moving knife base and electrically connected to the moving knife base. When one end of the moving knife assembly rotates relative to the moving knife base, the other end realizes the connection and disconnection of the electrical connection with the stationary knife head. The arc-extinguishing unit includes an arc-extinguishing chamber, a connecting sleeve, and an arc-extinguishing driving device. The arc-extinguishing chamber includes a stationary contact and a moving contact. The stationary contact is fixedly connected to the connecting sleeve, which is sleeved outside the stationary knife head. The moving contact is fixedly connected to the arc-extinguishing driving device.

[0006] The arc-extinguishing drive device includes a drive box hinged to the outer wall of the arc-extinguishing chamber, a linkage mechanism, and an insulating dial plate hinged to the drive box. The drive box is provided with a drive guide groove. The linkage mechanism is hinged between the moving contact of the arc-extinguishing chamber and the epoxy shell of the arc-extinguishing chamber. The linkage mechanism is provided with a moving pin, which passes through the drive guide groove of the drive box and moves along a sliding groove on the arc-extinguishing chamber enclosure under the drive of the drive guide groove. A first reset device is provided between the drive box and the outer wall of the arc-extinguishing chamber. A second reset device is provided between the insulating dial plate and the drive box. A second transfer contact is provided on the insulating dial plate and is electrically connected to the moving contact of the arc-extinguishing chamber. The second transfer contact is used to electrically connect with the moving blade assembly.

[0007] Initially, the rotating blade assembly drives the insulating plate and the drive box to rotate. The rotating blade assembly is electrically connected to the second transfer contact, and the moving pin moves within the drive guide groove of the drive box. During the first stage of the drive box's movement, the linkage mechanism does not pull the moving contact of the arc-extinguishing chamber. When the rotating blade assembly rotates to the point where it is completely disconnected from the stationary blade head and the distance reaches a safe distance, the drive box drives the moving pin to move linearly through the drive guide groove, causing the moving end of the arc-extinguishing chamber to move in the direction of disengagement from the arc-extinguishing chamber contact. The linkage mechanism pulls the moving contact of the arc-extinguishing chamber to disconnect the moving contact from the stationary contact. The rotating blade assembly drives the insulating plate and the drive box to continue rotating, and the arc is extinguished within the arc-extinguishing chamber. The rotating blade assembly continues to rotate and disengage from the insulating plate. Under the action of the first and second reset devices, the insulating plate and the drive box rotate back to their original positions, and the moving contact of the arc-extinguishing chamber also returns to its original position.

[0008] Furthermore, the linkage mechanism includes a first driving link, a second driving link, and a third driving link. One end of the first driving link is hinged to the moving contact of the arc-extinguishing chamber, and the other end of the first driving link is hinged to one end of the second driving link through a moving pin. The moving pin passes through the driving guide groove of the driving box and moves along the driving guide groove. The other end of the second driving link is hinged to the outer wall of the arc-extinguishing chamber through the third driving link. The driving box drives the moving pin to move, thereby driving the first driving link to pull the moving contact of the arc-extinguishing chamber to disconnect the moving contact from the stationary contact.

[0009] Furthermore, the drive guide groove includes a first arc and a second arc, the radius of the first arc and the second arc are concentric but different, and the end of the first arc and the beginning of the second arc are smoothly transitioned.

[0010] Furthermore, the second transfer contact is electrically connected to the moving contact of the arc-extinguishing chamber via a connecting wire.

[0011] Furthermore, it also includes a grounding contact, which is fixed to the grounding contact mounting beam by grounding contact fixing screws. One end of the moving blade assembly is hinged to the moving blade seat. The moving blade assembly is driven by the blade gate drive sleeve to rotate around the moving blade seat, realizing the switching of the moving blade assembly from the stationary blade head to the grounding contact.

[0012] Furthermore, the knife switch drive sleeve includes a connecting plate and a crank. One end of the connecting plate is hinged to the moving knife assembly, and the other end is hinged to one end of the crank. The other end of the crank is fixedly connected to the main shaft of the load switch.

[0013] Furthermore, the moving knife assembly includes two symmetrically installed knife gates. The two symmetrically installed knife gates are positioned and fixed by limiting pins and locking nuts, and one end of the knife gate is hinged to the moving knife seat, and the other end is hinged to the moving contact.

[0014] Furthermore, the outer contour of the first transfer contact extends out of the knife switch, and during the current transfer process, conductive connection is achieved by relying on the first transfer contact and the second transfer contact.

[0015] Furthermore, the arc-extinguishing chamber is enclosed on the outside, which covers the stationary end of the arc-extinguishing chamber. The enclosed portion includes an extension that semi-encloses the cylinder. The length of the extension covers the hinged portion of the moving contact of the arc-extinguishing chamber and the linkage mechanism. The linkage mechanism is hinged to the outer wall of the arc-extinguishing chamber by being hinged to the enclosed portion.

[0016] Furthermore, the first reset device uses a tension spring, and the second reset device uses a torsion spring.

[0017] Beneficial effects: Compared with the prior art, the present invention has the advantage of extinguishing the arc in an arc-extinguishing chamber without the need for SF6 gas, thus meeting environmental protection requirements while ensuring the insulation requirements of equipment with a system voltage of 24kV and below. Attached Figure Description

[0018] Figure 1 This is a front view of the load switch of the present invention.

[0019] Figure 2 This is a right view of the load switch of the present invention.

[0020] Figure 3 This is a rear view of the load switch of the present invention.

[0021] Figure 4 These are the top view, front view, and sectional view of the stationary head beam in this invention.

[0022] Figure 5 These are the front view, top view, and sectional view of the moving tool holder crossbeam in this invention.

[0023] Figure 6 This is a cross-sectional view of the load switch of the present invention.

[0024] Figure 7 This is a partial cross-sectional view of the moving tool assembly in this invention.

[0025] Figure 8 These are the front view, sectional view, and perspective view of the arc-extinguishing unit in this invention.

[0026] Figure 9 This is a cross-sectional view of the arc-extinguishing chamber encapsulation in this invention.

[0027] Figure 10 This is a schematic diagram of the contact between the knife gate and the stationary knife head in this invention.

[0028] Figure 11 This is a schematic diagram of the knife gate after it comes into contact with the stationary knife head in this invention.

[0029] Figure 12 This is a schematic diagram of the contact between the knife switch and the grounding contact in this invention. Detailed Implementation

[0030] like Figures 1 to 5 As shown in this embodiment, an environmentally friendly load switch suitable for 24kV and below includes several stationary blades 1-1, moving blade assemblies 15, moving blade seats 6-1, and arc-extinguishing units 14. The support plate includes a front mounting plate 2 and a rear mounting plate 9 disposed at both ends of the load switch main shaft 23. A dynamic seal 4 is provided at the end of the load switch main shaft 23. The load switch main shaft adopts a hexagonal insulated shaft. A first insulating partition 3 is fixedly disposed on the inner side of the front mounting plate 2 by a first insulating partition fixing screw 7. A second insulating partition 10 is fixedly disposed on the inner side of the rear mounting plate 9 by a second insulating partition fixing screw. The stationary blades 1-1, moving blade assemblies 15, moving blade seats 6-1, and arc-extinguishing units 14 are located between the first insulating partition 3 and the second insulating partition 10. Several spacers are provided on the load switch main shaft, including spacer I 5 and spacer II 11. The knife switch drive sleeve 15-1 is set between the spacers. The stationary knife beam 1, the moving knife seat beam 6, and the grounding contact mounting beam 12 are installed between the front mounting plate 2 and the rear mounting plate 9. The stationary knife beam 1 is fixed by the stationary knife beam fixing screw 8, which is fixed by the mounting nut insert 1-3. The grounding contact mounting beam 12 is fixed by the grounding beam fixing screw 13. The moving knife seat beam 6 is fixed by the moving knife seat beam fixing screw, which is fixed by the mounting nut insert 6-3. The stationary knife is fixed on the stationary knife beam 1 and separated by SMC insulation material. The moving knife seat 6-1 is installed on the fixed moving knife seat beam 6 and separated by SMC insulation material. The grounding contact 16 is installed on the grounding contact mounting beam 12 by the grounding contact fixing screw 17.

[0031] like Figure 6As shown, one end of the moving blade assembly 15 is hinged to the moving blade holder 6-1 and electrically connected to it. When one end of the moving blade assembly 15 rotates relative to the moving blade holder 6-1, the other end connects and disconnects from the stationary blade head 1-1. The arc extinguishing unit includes an arc extinguishing chamber, a connecting sleeve 14-1-1, and an arc extinguishing drive device. The arc extinguishing chamber includes a stationary contact and a moving contact. The stationary contact is fixedly connected to the connecting sleeve 14-1-1 via a double-ended stud 14-1-2. The connecting sleeve 14-1-1 is fixedly sleeved on the outside of the stationary blade head 1-1 by a set screw 19 and tightened by a clamping nut 18. The moving contact is fixedly connected to the arc extinguishing drive device. One end of the moving blade assembly 15 is hinged to the moving blade holder 6-1. The moving blade assembly 15 is driven by the knife switch drive sleeve 15-1 to rotate around the moving blade holder 6-1, realizing the switching of the moving blade assembly 15 from the stationary blade head 1-1 to the grounding contact 16.

[0032] The knife switch drive sleeve 15-1 includes a connecting plate 21 and a crank. One end of the connecting plate 21 is hinged to the moving knife assembly 15 by a nylon pin 20, and the other end is hinged to one end of the crank by a nylon pin 22. The other end of the crank is fixedly connected to the load switch main shaft 23.

[0033] like Figure 7 As shown, the moving knife assembly 15 includes two symmetrically mounted knife gates 15-13. The two symmetrically mounted knife gates 15-13 are positioned by limit pins 15-10 and hinged to the moving knife seat 6-1 by knife gate rotating screws 15-11. SMC insulating material is provided between the moving knife seats 6-1. The end of the knife gate rotating screw 15-11 is fixed by a lock nut 15-14, and a stationary contact spring 15-12 is provided between the knife gate rotating screw 15-11 and the moving knife seat 6-1. The other end of the knife gate 15-13 is hinged to two first moving contacts 15-6, which are connected to the knife gate 15-3 by locking screws 15-2. The circular protrusions on the locking screw 15-4 and the transfer contact 15-6 are used for positioning. The moving end contact spring 15-7 on the locking nut 15-8 is fitted to maintain contact with the knife switch 15-13, thus achieving a conductive connection between the two. Disc springs 15-3 and 15-5 are respectively provided on the locking screw 15-2 and the locking screw 15-4, and the outer contour of the first transfer contact 15-6 extends out of the knife switch 15-13 through the locking nuts 15-8 and 15-9 respectively. During the current transfer process, the conductive connection is achieved by the first transfer contact 15-6 and the second transfer contact 14-14.

[0034] like Figure 8As shown, the arc-extinguishing drive device includes a drive box 14-3 hinged to the outer wall of the arc-extinguishing chamber, a linkage mechanism, and an insulating dial 14-6 hinged to the drive box 14-3. The drive box 14-3 is provided with a drive guide groove. The linkage mechanism is hinged between the moving contact of the arc-extinguishing chamber and the outer wall of the arc-extinguishing chamber. The linkage mechanism is provided with a moving pin 14-4, which passes through the drive guide groove of the drive box 14-3 and moves along the drive guide groove. The drive guide groove includes a first arc and a second arc. The radius of the first arc and the second arc are concentric but have different radii. The end of the first arc and the beginning of the second arc are smoothly transitioned. The starting angles of the first arc and the second arc are set according to the relative position of the drive box 14-3 during the entire movement process, thereby ensuring that the moving end of the arc-extinguishing chamber can open to a certain distance only when it moves to the designated position. The idle travel of the drive box at both ends is controlled by the length of two concentric circles at each end, and the opening distance of the arc-extinguishing chamber is controlled by the radius difference of the two concentric grooves. This structure avoids the repeated debugging operations required to achieve the rated opening distance through mechanical movement limiters, and further ensures the consistency of the opening distance data. The drive box 14-3 is hinged to the outer wall of the arc-extinguishing chamber by an insulating pin 14-2. A first reset device is set between the drive box 14-3 and the outer wall of the arc-extinguishing chamber, which adopts a drive box tension spring 14-17. The insulating lever 14-6 is hinged to the drive box 14-3 by an insulating pin 14-5. A second reset device is set between the insulating lever 14-6 and the drive box 14-3, which adopts a coil spring 14-13. A second transfer contact 14-14 is provided on the insulating plate 14-6. The second transfer contact 14-14 is fixed to the insulating plate 14-6 by a transfer contact fixing screw 14-15. The second transfer contact is electrically connected to the moving contact of the arc-extinguishing chamber through a connecting wire 14-16. The second transfer contact 14-14 is used to be electrically connected to the moving knife assembly 15.

[0035] The linkage mechanism includes a first drive link 14-11, a second drive link 14-12, and a third drive link 14-18. One end of the first drive link 14-11 is hinged to a crimp terminal 14-7 via a drive connecting sleeve 14-10. The crimp terminal 14-7 is fixedly connected to the moving contact of the arc-extinguishing chamber via a stepped pin 14-9 and is provided with an anti-loosening washer 14-8. The other end of the first drive link 14-11 is hinged to one end of the second drive link 14-12 via a moving pin 14-4. The moving pin 14-4 passes through the drive guide groove of the drive box 14-3 and moves along the drive guide groove. The other end of the second drive link 14-12 is hinged to the outer wall of the arc-extinguishing chamber via the third drive link 14-18. The drive box 14-3 drives the moving pin 14-4 to move, thereby driving the first drive link 14-11 to pull the moving contact of the arc-extinguishing chamber to disconnect the moving contact from the stationary contact.

[0036] like Figure 9As shown, the arc-extinguishing chamber 14-1-3 is surrounded by an arc-extinguishing chamber enclosure 14-1 on its outer side. The arc-extinguishing chamber enclosure 14-1 encloses the stationary end of the arc-extinguishing chamber and includes an extension portion. The extension portion of the arc-extinguishing chamber enclosure 14-1 is a semi-enclosed cylinder, and the length of the extension portion covers the hinge portion between the moving contact of the arc-extinguishing chamber and the linkage mechanism. The linkage mechanism is hinged to the outer wall of the arc-extinguishing chamber by hinged to the arc-extinguishing chamber enclosure 14-1. The extension portion of the arc-extinguishing chamber enclosure 14-1 is provided with a sliding groove, and one end of the first driving linkage 14-11 moves along the sliding groove.

[0037] like Figures 10 to 11 As shown, initially, the moving blade assembly 15 rotates, causing the insulating dial plate 14-6 and the drive box 14-3 to rotate. The moving blade assembly 15 is electrically connected to the second transfer contact 14-14, and the moving pin 14-4 moves within the drive guide groove of the drive box 14-3. The linkage mechanism does not pull the moving contact of the arc-extinguishing chamber. When the moving blade assembly 15 rotates to the point where it is completely disconnected from the stationary blade head 1-1 and the distance reaches a safe distance, the moving blade assembly 15 continues to rotate, causing the insulating dial plate 14-6 and the drive box 14-3 to rotate. The moving pin 14-4 is moved, and the linkage mechanism pulls the moving contact of the arc-extinguishing chamber to disconnect the electrical connection between the moving contact and the stationary contact. The moving knife assembly 15 drives the insulating plate 14-6 and the drive box 14-3 to continue rotating, and the arc is extinguished in the arc-extinguishing chamber. The moving knife assembly 15 continues to rotate and disengages from the insulating plate 14-6. Under the action of the first reset device and the second reset device, the insulating plate 14-6 and the drive box 14-3 rotate back to their original positions, and the moving contact of the arc-extinguishing chamber also returns to its original position. The moving knife assembly 15 continues to rotate and connects with the grounding contact.

Claims

1. An environmentally friendly load switch suitable for 24kV and below, characterized in that, The device includes a stationary cutter head (1-1), a moving cutter assembly (15), a moving cutter holder (6-1), and an arc-extinguishing unit (14). One end of the moving cutter assembly (15) is hinged to the moving cutter holder (6-1) and electrically connected to it. When one end of the moving cutter assembly (15) rotates relative to the moving cutter holder (6-1), the other end is electrically connected to and disconnected from the stationary cutter head (1-1). The arc-extinguishing unit includes an arc-extinguishing chamber, a connecting sleeve (14-1-1), and an arc-extinguishing drive device. The arc-extinguishing chamber includes a stationary contact and a moving contact. The stationary contact is fixedly connected to the connecting sleeve (14-1-1). The connecting sleeve (14-1-1) is sleeved outside the stationary cutter head (1-1). The moving contact is fixedly connected to the arc-extinguishing drive device. The arc-extinguishing drive device includes a drive box (14-3) hinged to the outer wall of the arc-extinguishing chamber, a linkage mechanism, and an insulating dial plate (14-6) hinged to the drive box (14-3). The drive box (14-3) is provided with a drive guide groove. The linkage mechanism is hinged between the moving contact of the arc-extinguishing chamber and the epoxy shell of the arc-extinguishing chamber. The linkage mechanism is provided with a moving pin (14-4), which passes through the drive guide groove of the drive box (14-3). The slide groove on the lower edge of the arc-extinguishing chamber enclosure (14-1) moves. A first reset device is provided between the drive box (14-3) and the outer wall of the arc-extinguishing chamber. A second reset device is provided between the insulating dial plate (14-6) and the drive box (14-3). A second transfer contact (14-14) is provided on the insulating dial plate (14-6). The second transfer contact is electrically connected to the moving contact of the arc-extinguishing chamber. The second transfer contact (14-14) is used to electrically connect with the moving knife assembly (15). Initially, the rotating blade assembly (15) drives the insulating dial plate (14-6) and the drive box (14-3) to rotate. The rotating blade assembly (15) is electrically connected to the second transfer contact (14-14), and the moving pin (14-4) moves within the drive guide groove of the drive box (14-3). During the first stage of the drive box (14-3)'s movement, the linkage mechanism does not pull the moving contact of the arc-extinguishing chamber. When the rotating blade assembly (15) rotates to the point where it is completely disconnected from the stationary blade head (1-1) and the distance reaches a safe distance, the drive box (14-3) drives the moving pin through the drive guide groove. (14-4) The linear movement drives the moving end of the arc-extinguishing chamber to move in the direction of disengagement from the arc-extinguishing chamber contact. The linkage mechanism pulls the moving contact of the arc-extinguishing chamber to disconnect the conductive connection between the moving contact and the stationary contact. The moving knife assembly (15) drives the insulating plate (14-6) and the drive box (14-3) to continue rotating. The arc is extinguished in the arc-extinguishing chamber. The moving knife assembly (15) continues to rotate and disengage from the insulating plate (14-6). The insulating plate (14-6) and the drive box (14-3) rotate and return to their original positions under the action of the first reset device and the second reset device. The moving contact of the arc-extinguishing chamber also returns to its original position. The linkage mechanism includes a first drive link (14-11), a second drive link (14-12), and a third drive link (14-18). One end of the first drive link (14-11) is hinged to the moving contact of the arc-extinguishing chamber. The other end of the first drive link (14-11) is hinged to one end of the second drive link (14-12) via a moving pin (14-4). The moving pin (14-4) passes through the drive guide groove of the drive box (14-3) and moves along the drive guide groove. The other end of the second drive link (14-12) is hinged to the outer wall of the arc-extinguishing chamber via the third drive link (14-18). The drive box (14-3) drives the moving pin (14-4) to move, thereby driving the first drive link (14-11) to pull the moving contact of the arc-extinguishing chamber to disconnect the moving contact from the stationary contact.

2. The environmentally friendly load switch suitable for 24kV and below as described in claim 1, characterized in that, The drive guide groove includes a first arc and a second arc. The first arc and the second arc share the same center but have different radii, and the end of the first arc smoothly transitions to the beginning of the second arc.

3. The environmentally friendly load switch suitable for 24kV and below as described in claim 1, characterized in that, The second transfer contact (14-14) is electrically connected to the moving contact of the arc-extinguishing chamber via a connecting wire (14-16).

4. The environmentally friendly load switch suitable for 24kV and below as described in claim 1, characterized in that, It also includes a grounding contact (16), which is fixed to the grounding contact mounting beam (12) by grounding contact fixing screws. One end of the moving knife assembly (15) is hinged to the moving knife seat (6-1). The moving knife assembly (15) is driven by the knife gate drive sleeve (15-1) and rotates around the moving knife seat (6-1) to realize the switching of the moving knife assembly (15) from the stationary knife head (1-1) to the grounding contact (16).

5. The environmentally friendly load switch suitable for 24kV and below as described in claim 4, characterized in that, The knife switch drive sleeve (15-1) includes a connecting plate (21) and a crank. One end of the connecting plate (21) is hinged to the moving knife assembly (15), and the other end is hinged to one end of the crank. The other end of the crank is fixedly connected to the main shaft of the load switch.

6. The environmentally friendly load switch suitable for 24kV and below according to claim 4, characterized in that, The moving knife assembly (15) includes two symmetrically installed knife gates (15-13). The two symmetrically installed knife gates (15-13) are positioned and limited by the limiting pins (15-10) and the locking nuts (15-9). One end of the knife gate (15-13) is hinged to the moving knife seat (6-1), and the other end is hinged to the first transfer contact (15-6).

7. The environmentally friendly load switch suitable for 24kV and below according to claim 6, characterized in that, The outer contour of the first transfer contact (15-6) extends out of the knife switch (15-13). During the current transfer process, the first transfer contact (15-6) and the second transfer contact (14-14) are used to achieve a conductive connection.

8. The environmentally friendly load switch suitable for 24kV and below according to claim 1, characterized in that, The arc-extinguishing chamber is enclosed by an arc-extinguishing chamber enclosure (14-1) on its outer side. The arc-extinguishing chamber enclosure (14-1) encloses the stationary end of the arc-extinguishing chamber and includes an extension portion. The extension portion of the arc-extinguishing chamber enclosure (14-1) is a semi-enclosed cylinder, and the length of the extension portion of the arc-extinguishing chamber enclosure (14-1) covers the hinge portion of the moving contact of the arc-extinguishing chamber and the linkage mechanism. The linkage mechanism is hinged to the outer wall of the arc-extinguishing chamber by hinged to the arc-extinguishing chamber enclosure (14-1).

9. The environmentally friendly load switch for 24kV and below as described in claim 1, characterized in that, The first reset device uses a tension spring, and the second reset device uses a torsion spring.

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