Environment-friendly load switch based on vacuum breaking

Abstract

The application relates to the technical field of high-voltage power transmission and distribution equipment, and discloses an environment-friendly load switch based on vacuum breaking, which comprises a knife switch assembly, a vacuum arc-extinguishing chamber assembly, an arc-extinguishing mechanism assembly and a grounding device, the knife switch assembly comprises a knife switch moving end and a knife switch static end, the knife switch moving end is in contact with or separated from the knife switch static end through external driving, and the contact and separation of the knife switch moving end and the knife switch static end correspond to the connection and disconnection of a main conducting loop. The knife switch assembly and the vacuum arc-extinguishing chamber assembly are reasonably arranged, the arc-extinguishing mechanism assembly is actuated to realize complete transfer of current to the vacuum arc-extinguishing chamber branch during switching-off, the vacuum arc-extinguishing chamber is used to complete arc extinguishing, the actuation of the arc-extinguishing mechanism assembly ensures that the vacuum arc-extinguishing chamber is driven to switch off only after enough insulation electrical clearance is reached between the knife switch moving end and the knife switch static end, and the arc is ensured to be generated and extinguished only in the vacuum arc-extinguishing chamber, and the risk of arc reignition or breakdown between the knife switch moving end and the knife switch static end is avoided.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power transmission and distribution equipment technology, specifically to an environmentally friendly load switch based on vacuum interruption. Background Technology

[0002] In the field of medium and high voltage switchgear, sulfur hexafluoride (SF6) gas is widely used due to its excellent arc-quenching and insulation properties. However, SF6 is a strong greenhouse gas, with a greenhouse potential 23,500 times that of carbon dioxide. On average, each load switch contains 1 kg of SF6. If an accident occurs, releasing this 1 kg of SF6 into the atmosphere, the environmental impact would be equivalent to driving a car approximately 200,000 kilometers (assuming a car emits approximately 120 grams of carbon dioxide per kilometer). Therefore, the necessity of finding the best alternative for SF6 insulation and arc quenching is self-evident. Furthermore, during the arc decomposition process, SF6 generates various toxic byproducts. These substances not only pollute the atmosphere but may also endanger the health of on-site operators.

[0003] The technical solution of using vacuum as the arc-extinguishing medium and supplemented by environmentally friendly gas insulation has significant environmentally friendly characteristics and has become the direction for the green transformation of medium and high voltage switchgear. Currently, one of the technical routes for environmentally friendly load switches is to form a vacuum interrupter connected in series with a three-position disconnector. This solution is mature in application. However, for load switches, the vacuum interrupter must ensure short-circuit making capacity, withstand electrodynamic forces, short-time withstand current capacity (including its peak withstand current capacity), and continuous current withstand capacity. Therefore, the vacuum interrupter used in load switches is the same size and has a similar cost to the vacuum interrupter used in vacuum circuit breakers, resulting in a higher cost for this solution.

[0004] According to publicly available information, another type of environmentally friendly load switch uses parallel vacuum interrupter interruption. This technical solution uses a vacuum interrupter branch connected in parallel with the main circuit. During the load switch opening process, the current is transferred to the vacuum interrupter branch, and then the vacuum interrupter is used to interrupt the load current of the main circuit. Since the vacuum interrupter is in a closed state in the initial position, when the load switch is closed, in order to avoid pre-breakdown and arcing between the moving end of the disconnector and the conductor of the interrupter branch, an insulating material contact surface must be set in the interrupter branch to make early contact with the moving end of the disconnector. Given that the speed of the moving end of the disconnector is required to be as fast as possible during short-circuit closing, higher requirements are inevitably placed on the reliability of the insulating material contact surface. Summary of the Invention

[0005] This invention provides an environmentally friendly load switch based on vacuum interruption, which solves the problems mentioned in the background art.

[0006] This invention provides the following technical solution: an environmentally friendly load switch based on vacuum interruption, comprising a knife switch assembly, a vacuum interrupter assembly, an arc extinguishing mechanism assembly, and a grounding device. The knife switch assembly includes a moving end and a stationary end. The moving end of the knife switch contacts or disconnects from the stationary end of the knife switch through an external drive. The contact and disconnection of the moving end and the stationary end of the knife switch correspond to the connection and disconnection of the main conductive circuit. The vacuum interrupter assembly includes a stationary contact and a moving contact. The vacuum interrupter assembly includes a linkage assembly that cooperates with the moving contact. The stationary contact is electrically connected to the stationary end of the disconnect switch, and the moving contact is connected to the linkage assembly. The arc extinguishing mechanism assembly includes a cam slider device and a push plate device. The cam slider device cooperates with the connecting rod assembly of the vacuum arc extinguishing chamber assembly. The push plate device is fixedly connected and electrically connected to the moving end of the knife switch assembly. The slider and moving contact of the cam slider device are electrically connected by a flexible device. When the moving end of the disconnector assembly contacts the stationary end of the disconnector assembly, the load switch is in the closed state, and the circuit current flows from the stationary end of the disconnector to the moving end of the disconnector. When the moving end of the disconnector of the disconnector assembly is in contact with the grounding device, the load switch is in the line grounding state; The load switch is in the open state when the moving end of the disconnector assembly is not in contact with the stationary end of the disconnector and is not in contact with the grounding device in a stable position. The disconnector assembly and the vacuum interrupter assembly are rationally arranged. The current is completely transferred to the vacuum interrupter branch during the opening process through the action of the arc extinguishing mechanism assembly. The arc is extinguished by the vacuum interrupter. During the opening process, the action of the arc extinguishing mechanism assembly ensures that the vacuum interrupter is driven to open only after sufficient insulation electrical clearance is reached between the moving end and the stationary end of the disconnector. This ensures that the arc is generated and extinguished only inside the vacuum interrupter, and there is no risk of arc reignition or breakdown between the moving end and the stationary end of the disconnector.

[0007] Specifically, the moving and stationary contacts of the vacuum interrupter assembly are in an open state when the load switch is closed, open, or grounded.

[0008] In the preferred embodiment, the moving contact of the vacuum interrupter is fixedly connected to a piston sleeve, the piston sleeve has a waist opening, the bottom of the moving contact is provided with a piston rod, and a pin is provided on the piston rod. The pin can only slide within the waist opening. A limiting sleeve is provided on the outer shell of the vacuum interrupter, and a first elastic element is provided between the limiting sleeve and the piston rod. Under the action of the first elastic element, the moving contact of the interrupter disengages from the stationary contact of the interrupter. The opening distance of the vacuum interrupter is adjusted by the dimensions of the limiting sleeve and the piston sleeve.

[0009] Specifically, when the moving end of the knife switch rotates in the first direction, a switch opening operation is performed; when it continues to rotate in the first direction while in the open state, a grounding closing operation is performed; when it rotates in the second direction while in the grounded state, a grounding opening operation is performed, while simultaneously keeping the switch in the open state; and when it continues to rotate in the second direction while in the open state, a closing operation is performed.

[0010] Preferably, the push plate device includes a mounting plate fixedly connected to the moving end of the knife switch. The mounting plate is provided with pin 1, pin 2, pin 3 and pin 4. The push plate device is provided with a push plate, which is made of conductive material. The push plate is electrically connected to the moving end of the knife switch. The push plate is provided with a waist hole. The angle of rotation of the push plate around pin 4 is limited by the size of the waist hole and pin 1. A second elastic element is provided between pin 2 and pin 3. The force of the second elastic element limits the push plate to the position where the end of the waist hole A mates with pin 1.

[0011] In the preferred embodiment, the cam slider device is provided with a slider, and the slider is provided with a groove structure. When the slider moves along the third moving direction arranged by the guide rail, a roller is slidably connected in the groove of the slider. The roller moves from "point 0" to "point 1", from "point 1" to "point 2", and from "point 2" to "point 3". A third elastic element is installed inside the slider. When the slider moves along the fourth moving direction arranged by the guide rail under the action of the third elastic element, the roller moves from "point 3" to the initial position "point 0" along the wedge-shaped inclined surface on the slider. A fourth elastic element is provided at its bottom, and under the action of the fourth elastic element and the pin connected to it, the roller always stays in the groove structure of the slider during the process of moving from "point 3" to the initial position "point 0" along the wedge-shaped inclined surface on the slider.

[0012] Preferably, the push plate has an opening contact surface and an closing contact surface, and an elastic contact piece is provided on the push plate. The elastic contact piece maintains an electrical connection with the slider when the switch is in the closed state.

[0013] Preferably, the slider has a first contact surface and a second contact surface. When the switch is opened, the push plate acts on the first contact surface, and when the switch is closed, the push plate acts on the second contact surface.

[0014] In the selected configuration, the push plate and the first contact surface of the slider are always in contact. The slider moves along the third moving direction. During the process of the roller moving from "point O" to "point A", the drive rod acts on the piston rod, the first elastic element is compressed, and the moving contact and stationary contact of the vacuum interrupter are electrically connected under the action of the contact self-closing force. At this time, a part of the current flows through the main circuit of the stationary end and the moving end of the knife switch, and another part of the current flows through the stationary contact and the moving contact of the vacuum interrupter, then through the slider and the push plate, and finally merges into the moving end of the knife switch. With the movement of the slider, the moving end and the stationary end of the knife switch are completely separated, and the circuit current is completely transferred to the vacuum interrupter branch. During the process of the roller moving from point "a" to point "b", the moving end and stationary end of the disconnector establish a safe insulation distance that meets the technical requirements. During the process of the roller moving from point "b" to point "c", the first elastic element releases potential energy, and the moving contact of the vacuum interrupter separates from the stationary contact of the vacuum interrupter under the action of potential energy, so as to complete the arc extinguishing and interruption of the circuit current. When the load switch is about to complete the opening operation, the push plate disengages from the slider, and the slider moves along the fourth moving direction arranged on the guide rail under the action of the third elastic element. The roller moves from point "c" to the initial position "o" along the wedge-shaped inclined surface on the slider, preparing for the next opening operation.

[0015] In the selected configuration, the opening contact surface of the push plate pushes the slider to perform the opening operation. When the moving end of the knife switch performs the closing operation in the second direction, the closing contact surface of the push plate contacts the slider. Under the action of the contact force, the push plate rotates around the pin. The B end of the push plate slides close to the pin. As the moving end of the knife switch continues to rotate, the push plate slides from the second contact surface of the slider to the first contact surface of the slider.

[0016] The present invention has the following beneficial effects: This invention utilizes a rational layout of the disconnector assembly and the vacuum interrupter assembly. The arc-extinguishing mechanism ensures that the current is completely transferred to the vacuum interrupter branch during the opening process, and the vacuum interrupter extinguishes the arc. The operation of the arc-extinguishing mechanism ensures that the vacuum interrupter is only driven to open after sufficient electrical clearance is achieved between the moving and stationary ends of the disconnector. This ensures that the arc is generated and extinguished only inside the vacuum interrupter, eliminating the risk of arc reignition or breakdown between the moving and stationary ends of the disconnector. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the load switch of the present invention; Figure 2 This is a schematic diagram of the vacuum interrupter assembly and cam slider device of the load switch of the present invention; Figure 3 This is a schematic diagram of the push plate device of the load switch according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the trajectory of the roller moving in the slide groove of the cam during the opening process of the load switch according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the slider structure of the load switch according to an embodiment of the present invention; Figure 6 This is a schematic diagram showing the parallel current connection during the tripping process of a load switch according to an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the current transfer process of a load switch during the tripping process according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the load switch after completing current interruption according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the load switch in the open state according to an embodiment of the present invention; Figure 10 This is a schematic diagram of a load switch in a grounded state according to an embodiment of the present invention.

[0018] In the diagram: 1. Knife switch assembly; 11. Stationary end of knife switch; 12. Moving end of knife switch; 3. Vacuum interrupter assembly; 31. Stationary contact; 32. Moving contact; 33. Linkage assembly; 331. Limit sleeve; 332. Piston sleeve; 3321. Waist opening; 333. Pin; 334. First elastic element; 335. Piston rod; 336. Pin shaft; 337. Drive rod; 339. Roller; 340. Fourth elastic element; 4. Arc extinguishing mechanism assembly; 41. Push plate device. 411. Push plate; 4112. Opening contact surface; 4113. Closing contact surface; 412. Elastic contact piece; 413. Pin 1; 414. Mounting plate; 415. Pin 2; 416. Pin 3; 417. Second elastic element; 418. Pin 4; 419. Waist hole; 42. Cam slider device; 421. Slider; 4212. Second contact surface; 4213. First contact surface; 422. Guide rail; 423. Third elastic element; 5. Grounding device. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-10An environmentally friendly load switch based on vacuum interruption includes a knife switch assembly 1, a vacuum interrupter assembly 3, an arc extinguishing mechanism assembly 4, and a grounding device 5. The knife switch assembly 1 includes a knife switch moving end 12 and a knife switch stationary end 11. The knife switch moving end 12 contacts or disconnects from the knife switch stationary end 11 through external drive. The contact and disconnection of the knife switch moving end 12 and the knife switch stationary end 11 correspond to the connection and disconnection of the main conductive circuit. The vacuum interrupter assembly 3 includes a stationary contact 31 and a moving contact 32. The vacuum interrupter assembly 3 includes a connecting rod assembly 33 that cooperates with the moving contact 32. The stationary contact 31 is electrically connected to the stationary end 11 of the knife switch, and the moving contact 32 is connected to the connecting rod assembly 33. The arc extinguishing mechanism assembly 4 includes a cam slider device 42 and a push plate device 41. The cam slider device 42 cooperates with the connecting rod assembly 33 of the vacuum interrupting chamber assembly 3. The push plate device 41 is fixedly connected and electrically connected to the moving end 12 of the knife switch assembly 1. The slider 421 of the cam slider device 42 and the moving contact 32 are electrically connected by a flexible device. When the moving end 12 of the disconnector assembly 1 contacts the stationary end 11 of the disconnector assembly 1, the load switch is in the closed state, and the circuit current flows from the stationary end 11 of the disconnector into the moving end 12 of the disconnector. When the moving end 12 of the disconnector assembly 1 is in contact with the grounding device 5, the load switch is in the line grounding state; When the load switch is in a stable position where the moving end 12 of the disconnector assembly 1 is not in contact with the stationary end 11 of the disconnector and is not in contact with the grounding device 5, the load switch is in the open state. The disconnector assembly 1 and the vacuum interrupter assembly 3 are rationally arranged. The current is completely transferred to the vacuum interrupter branch during the opening process through the action of the arc extinguishing mechanism assembly 4. The arc is extinguished by the vacuum interrupter. During the opening process, the action of the arc extinguishing mechanism assembly 4 ensures that the vacuum interrupter is driven to open only after the moving end 12 and the stationary end 11 of the disconnector have reached a sufficient electrical clearance. This ensures that the arc is generated and extinguished only inside the vacuum interrupter, and there is no risk of arc reignition or breakdown between the moving end 12 and the stationary end 11 of the disconnector. When the moving end 12 of the disconnector rotates in the first direction, it performs a switch opening operation. When it continues to rotate in the first direction while in the open state, it performs a grounding closing operation. When it rotates in the second direction while in the grounding state, it performs a grounding opening operation, and at the same time, it puts the switch in the open state. When it continues to rotate in the second direction while in the open state, it performs a closing operation.

[0021] The moving contact 32 of the vacuum interrupter is fixedly connected to a piston sleeve 332. A waist opening 3321 is provided on the piston sleeve 332. A piston rod 335 is provided at the bottom of the moving contact 32. A pin 333 is provided on the piston rod 335. The pin 333 can only slide within the waist opening 3321. A limiting sleeve 331 is provided on the outer shell of the vacuum interrupter. A first elastic element 334 is provided between the limiting sleeve 331 and the piston rod 335. Under the action of the first elastic element 334, the moving contact 32 of the interrupter disengages from the stationary contact 31 of the interrupter. The opening distance of the vacuum interrupter is adjusted by the dimensions of the limiting sleeve 331 and the piston sleeve 332. The push plate device 41 includes a mounting plate 414 fixedly connected to the moving end 12 of the knife switch. The mounting plate 414 is provided with pin 1 413, pin 2 415, pin 3 416 and pin 418. The push plate device 41 is provided with a push plate 411, which is made of conductive material and is electrically connected to the moving end 12 of the knife switch. The push plate 411 is provided with a waist hole 419. The angle of rotation of the push plate 411 around pin 418 is limited by the size of the waist hole 419 and pin 1 413. A second elastic element 417 is provided between pin 2 415 and pin 3 416. The force of the second elastic element 417 limits the push plate 411 to the position where the end of the waist hole 419A cooperates with pin 1 413. The push plate 411 has an opening contact surface 4112 and a closing contact surface 4113. An elastic contact piece 412 is provided on the push plate 411. The elastic contact piece 412 is electrically connected to the slider 421 when the switch is in the closed state. The slider 421 has a first contact surface 4213 and a second contact surface 4212. When the switch is opened, the push plate 411 acts on the first contact surface 4213. When the switch is closed, the push plate 411 acts on the second contact surface 4212. The cam slider device 42 is equipped with a slider 421, which has a groove structure. When the slider 421 moves along the third moving direction of the guide rail 422, a roller 339 is slidably connected in the groove of the slider 421. The roller 339 moves from point "o" to point "a", from point "a" to point "b", and from point "b" to point "c". A third elastic element 423 is installed inside the slider 421. When the slider 421 moves along the fourth moving direction of the guide rail under the action of the third elastic element 423, the roller 339 moves from point "c" to the initial position "o" along the wedge-shaped inclined surface on the slider 421. A fourth elastic element 340 is provided at its bottom. Under the action of the fourth elastic element 340 and its connected pin 336, the roller 339 always stays in the groove structure of the slider 421 during the process of moving from point "c" to the initial position "o" along the wedge-shaped inclined surface on the slider 421. The first contact surface 4213 of the push plate 411 and the slider 421 is always in contact. The slider 421 moves along the third moving direction. During the process of the roller 339 moving from "point O" to "point A", the drive rod 337 acts on the piston rod 335, and the first elastic element 334 is compressed. The moving contact 32 and the stationary contact 31 of the vacuum interrupter are electrically connected under the action of the contact self-closing force. At this time, part of the current flows through the main circuit of the knife switch stationary end 11 and the knife switch moving end 12, and another part of the current flows through the vacuum interrupter stationary contact 31 and the vacuum interrupter moving contact 32, then through the slider 421 and the push plate 411, and finally merges into the knife switch moving end 12. With the movement of the slider 421, the knife switch moving end 12 and the knife switch stationary end 11 are completely separated, and the circuit current is completely transferred to the vacuum interrupter. In the vacuum interrupter branch circuit, during the process of roller 339 moving from point "a" to point "b", the moving end 12 and the stationary end 11 of the disconnector establish a safe insulation distance that meets the technical requirements. During the process of roller 339 moving from point "b" to point "c", the first elastic element 334 releases potential energy, and the moving contact 32 of the vacuum interrupter separates from the stationary contact 31 of the vacuum interrupter under the action of potential energy, so as to complete the arc extinguishing and interruption of the circuit current. When the load switch is about to complete the opening operation, the push plate 411 disengages from the slider 421. Under the action of the third elastic element 423, the slider 421 moves along the fourth moving direction arranged on the guide rail 422. Roller 339 moves from point "c" to the initial position "o" along the wedge-shaped inclined surface on the slider 421 to prepare for the next opening operation. The opening contact surface 4112 of the push plate 411 pushes the slider 421 to perform the opening operation. When the moving end 12 of the knife switch performs the closing operation in the second direction, the closing contact surface 4113 of the push plate 411 contacts the slider 421. Under the action of the contact force, the push plate 411 rotates around the pin 418. The end of the waist hole 419B of the push plate 411 slides close to the pin 413. As the moving end 12 of the knife switch continues to rotate, the push plate 411 slides from the second contact surface 4212 of the slider 421 to the first contact surface 4213 of the slider 421.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly load switch based on vacuum interruption, comprising a knife switch assembly (1), a vacuum interrupter assembly (3), an arc extinguishing mechanism assembly (4), and a grounding device (5), characterized in that: The knife switch assembly (1) includes a knife switch moving end (12) and a knife switch stationary end (11). The knife switch moving end (12) is driven by an external force to contact or disconnect from the knife switch stationary end (11). The contact and disconnection of the knife switch moving end (12) and the knife switch stationary end (11) correspond to the connection and disconnection of the main conductive circuit. The vacuum interrupter assembly (3) includes a stationary contact (31) and a moving contact (32). The vacuum interrupter assembly (3) includes a linkage assembly (33) that cooperates with the moving contact (32). The stationary contact (31) is electrically connected to the stationary end (11) of the knife switch, and the moving contact (32) is connected to the linkage assembly (33). The arc extinguishing mechanism assembly (4) includes a cam slider device (42) and a push plate device (41). The cam slider device (42) cooperates with the connecting rod assembly (33) of the vacuum interrupting chamber assembly (3). The push plate device (41) is fixedly connected and electrically connected to the moving end (12) of the knife switch assembly (1). The slider (421) of the cam slider device (42) and the moving contact (32) are electrically connected by a flexible device. When the moving end (12) of the disconnector assembly (1) is in contact with the stationary end (11) of the disconnector assembly (1), the load switch is in the closed state, and the circuit current flows from the stationary end (11) of the disconnector into the moving end (12). When the moving end (12) of the disconnector assembly (1) is in contact with the grounding device (5), the load switch is in the line grounding state; When the moving end (12) of the disconnector assembly (1) is not in contact with the stationary end (11) of the disconnector and is not in contact with the grounding device (5), the load switch is in the open state. The disconnector assembly (1) and the vacuum interrupter assembly (3) are arranged in a reasonable manner. The current is completely transferred to the vacuum interrupter branch during the opening process through the action of the arc extinguishing mechanism assembly (4). The arc is extinguished by the vacuum interrupter. During the opening process, the action of the arc extinguishing mechanism assembly (4) ensures that the vacuum interrupter is driven to open only after the moving end (12) and the stationary end (11) of the disconnector reach a sufficient electrical clearance. This ensures that the arc is generated and extinguished only inside the vacuum interrupter, and there is no risk of arc reignition or breakdown between the moving end (12) and the stationary end (11) of the disconnector.

2. The environmentally friendly load switch based on vacuum interruption according to claim 1, characterized in that: The moving contact (32) and stationary contact (31) of the vacuum interrupter assembly (3) are in the open state when the load switch is closed, open, or grounded.

3. The environmentally friendly load switch based on vacuum interruption according to claim 1, characterized in that: The moving contact (32) of the vacuum interrupter is fixedly connected to a piston sleeve (332). The piston sleeve (332) is provided with a waist opening (3321). The bottom of the moving contact (32) is provided with a piston rod (335). The piston rod (335) is provided with a pin (333). The pin (333) can only slide within the waist opening (3321). The outer shell of the vacuum interrupter is provided with a limiting sleeve (331). A first elastic element (334) is provided between the limiting sleeve (331) and the piston rod (335). Under the action of the first elastic element (334), the moving contact (32) of the interrupter disengages from the stationary contact (31) of the interrupter. The opening distance of the vacuum interrupter is adjusted by the size of the limiting sleeve (331) and the piston sleeve (332).

4. The environmentally friendly load switch based on vacuum interruption according to claim 1, characterized in that: When the moving end (12) of the knife switch rotates in the first direction, it performs a switch opening operation. When it continues to rotate in the first direction while in the opening state, it performs a grounding closing operation. When it rotates in the second direction while in the grounding state, it performs a grounding opening operation. At the same time, it puts the switch in the opening state. When it continues to rotate in the second direction while in the opening state, it performs a closing operation.

5. An environmentally friendly load switch based on vacuum interruption according to claim 1, characterized in that: The push plate device (41) includes a mounting plate (414) fixedly connected to the moving end (12) of the knife switch. The mounting plate (414) is provided with pin 1 (413), pin 2 (415), pin 3 (416) and pin 4 (418). The push plate device (41) is provided with a push plate (411). The push plate (411) is made of conductive material. The push plate (411) is electrically connected to the moving end (12) of the knife switch. The push plate (411) is provided with a waist hole (419). The angle at which the push plate (411) rotates around pin 4 (418) is limited by the size of the waist hole (419) and pin 1 (413). A second elastic element (417) is provided between pin 2 (415) and pin 3 (416). The force of the second elastic element (417) limits the push plate (411) to the position where the A end of the waist hole (419) cooperates with pin 1 (413).

6. The environmentally friendly load switch based on vacuum interruption according to claim 1, characterized in that: The cam slider device (42) is provided with a slider (421), and the slider (421) is provided with a groove structure. When the slider (421) moves along the third moving direction arranged on the guide rail (422), a roller (339) is slidably connected in the groove of the slider (421). The roller (339) moves from "point 0" to "point a", from "point a" to "point b", and from "point b" to "point c". A third elastic element (423) is installed inside the slider (421). When the roller (339) moves along the fourth moving direction arranged on the guide rail under the action of the third elastic element (423), it moves from "point c" to the initial position "point o" along the wedge-shaped inclined surface on the slider (421). The bottom of the roller (339) is provided with a fourth elastic element (340). Under the action of the fourth elastic element (340) and the pin (336) connected to it, the roller (339) is always in the groove structure of the slider (421) during the process of moving from "point c" to the initial position "point o" along the wedge-shaped inclined surface on the slider (421).

7. An environmentally friendly load switch based on vacuum interruption according to claim 5, characterized in that: The push plate (411) has an opening contact surface (4112) and a closing contact surface (4113). An elastic contact piece (412) is provided on the push plate (411). The elastic contact piece (412) is electrically connected to the slider (421) when the switch is in the closed state.

8. An environmentally friendly load switch based on vacuum interruption according to claim 6, characterized in that: The slider (421) has a first contact surface (4213) and a second contact surface (4212). When the switch is opened, the push plate (411) acts on the first contact surface (4213). When the switch is closed, the push plate (411) acts on the second contact surface (4212).

9. An environmentally friendly load switch based on vacuum interruption according to claims 1 and 5, characterized in that: The push plate (411) and the first contact surface (4213) of the slider (421) are always in contact. The slider (421) moves along the third moving direction. During the process of the roller (339) moving from "point O" to "point A", the drive rod (337) acts on the piston rod (335), and the first elastic element (334) is compressed. The moving contact (32) and the stationary contact (31) of the vacuum interrupter are electrically connected under the action of the contact self-closing force. At this time, a part of the current flows through the main circuit of the stationary end (11) and the moving end (12) of the knife switch, and another part of the current flows through the stationary contact (31) and the moving contact (32) of the vacuum interrupter, and then flows through the slider (421) and the push plate (411), and finally flows into the moving end (12) of the knife switch. With the movement of the slider (421), the moving end (12) and the stationary end (11) of the knife switch are completely separated, and the circuit current is completely reversed. Move to the vacuum interrupter branch; during the process of the roller (339) moving from "point a" to "point b", the moving end (12) of the knife switch and the stationary end (11) of the knife switch establish a safe insulation distance that meets the technical requirements; during the process of the roller (339) moving from "point b" to "point c", the first elastic element (334) releases potential energy, and the moving contact (32) of the vacuum interrupter separates from the stationary contact (31) of the vacuum interrupter under the action of potential energy, so as to complete the arc extinguishing and interruption of the circuit current; when the load switch is about to complete the opening operation, the push plate (411) disengages from the slider (421), and the slider (421) moves along the fourth moving direction arranged on the guide rail (422) under the action of the third elastic element (423), and the roller (339) moves from "point c" to the initial position "point o" along the wedge-shaped inclined surface on the slider (421) to prepare for the next opening operation.

10. An environmentally friendly load switch based on vacuum interruption according to claims 1 and 5, characterized in that: The opening contact surface (4112) of the push plate (411) pushes the slider (421) to perform the opening operation. When the moving end (12) of the knife switch performs the closing operation in the second direction, the closing contact surface (4113) of the push plate (411) contacts the slider (421). Under the action of the contact force, the push plate (411) rotates around the pin (418). The B end of the waist hole (419) of the push plate (411) slides close to the pin (413). As the moving end (12) of the knife switch continues to rotate, the push plate (411) slides from the second contact surface (4212) of the slider (421) to the first contact surface (4213) of the slider (421).

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