Environment-friendly load switch

Abstract

The invention relates to an environment-friendly load switch, which comprises a mechanism frame, a main shaft, three insulators, three isolation knives, three groups of crank arm assemblies, a grounding contact assembly and three groups of static contact assemblies, the static contact assembly comprises a conductive busbar, a static contact, a vacuum arc-extinguishing chamber, a support frame arranged on the fixed beam, a conductive member which is rotatably arranged on the support frame and is electrically connected with the vacuum arc-extinguishing chamber, and a torsion spring arranged between the conductive member and the support frame. And the opening piece is rotatably arranged on the support frame and is used for driving a pull rod of the vacuum arc-extinguishing chamber to execute an opening action, when the isolation knife executes the opening action, the conductive piece acts along with the isolation knife and drives the opening piece to act, and the opening piece drives the pull rod of the vacuum arc-extinguishing chamber to execute the opening action. The high-voltage switch cabinet has the advantages of being simple in structure, stable and reliable in performance, high in breaking capacity, small in size, good in insulation performance, high in safety and modularized.

Description

Technical Field

[0001] The invention relates to a load switch, in particular to an environmentally friendly load switch. Background Art

[0002] Load switches can be used as ring network power supply units or terminal equipment, and play the role of power distribution, control and protection. They are widely used in wind power generation, urban network construction and reconstruction projects, industrial and mining enterprises, high-rise buildings and public facilities. At present, most load switches use sulfur hexafluoride gas (SF6) combined with arc extinguishing grids to extinguish arcs. Once sulfur hexafluoride gas leaks, not only the insulation capacity decreases, there are safety hazards, but also environmental impacts. However, as people pay more attention to environmental protection, sulfur hexafluoride load switches have gradually been eliminated by users due to the disadvantages of their environmentally unfriendly insulating medium. As a result, environmentally friendly load switches with environmentally friendly air as the insulating medium have appeared on the market. Therefore, sulfur hexafluoride (SF6) load switches have gradually been replaced by environmentally friendly load switches. However, the existing environmentally friendly load switches have a relatively complex structural design and poor insulation performance. When opening the gate, vacuum arc extinguishing cannot be achieved, the arc extinguishing performance is unreliable, the breaking capacity is weak, and the safety is low. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an environmentally friendly load switch with simple structure, stable and reliable performance, strong breaking capacity, small size, good insulation performance, high safety and modularity.

[0004] To achieve the above-mentioned purpose, the present invention adopts an environmentally friendly load switch, including a mechanism frame, a main shaft rotatably arranged on the mechanism frame, three insulators respectively arranged on the mechanism frame, three isolating knives respectively rotatably arranged on the contact seats of the three insulators, three groups of crank arm assemblies that cooperate with the main shaft and are used to drive the three isolating knives to perform opening and closing actions, a grounding contact assembly arranged on the mechanism frame and matched with the three isolating knives, and three groups of static contact assemblies arranged on the mechanism frame and matched with the three isolating knives, wherein the static contact assembly includes a fixed beam arranged on the mechanism frame A conductive busbar on the conductive busbar, a static contact arranged on one end of the conductive busbar and cooperating with the isolating knife, a vacuum arc extinguishing chamber arranged on the conductive busbar, a support frame arranged on the fixed beam, a conductive member rotatably arranged on the support frame and electrically connected to the vacuum arc extinguishing chamber, a torsion spring arranged between the conductive member and the support frame, and a disconnecting member rotatably arranged on the support frame and used to drive a pull rod of the vacuum arc extinguishing chamber to perform a disconnecting action. When the isolating knife performs a disconnecting action, the conductive member moves with the isolating knife and drives the disconnecting member to move, and the disconnecting member drives the pull rod of the vacuum arc extinguishing chamber to perform a disconnecting action.

[0005] The beneficial effect of the above structure is that the static contact assembly of the environmentally friendly load switch adopts a modular structural design, which is compact and smaller in size. When closing the switch, the vacuum interrupter is in a normally closed state, the main shaft drives the isolating knife to move, the isolating knife first moves the conductive part (the isolating knife contacts the conductive part first), and then the isolating knife contacts the static contact, thereby realizing the connection between the isolating knife and the static contact. When opening the switch, the main shaft drives the isolating knife to perform the opening action. When the isolating knife contacts the conductive part, the conductive part connects the power supply between the isolating knife and the vacuum interrupter. When the isolating knife drives the conductive part to move (the isolating knife and the static contact are separated), the conductive part drives the opening part to move, and the opening part pulls the pull rod of the vacuum interrupter to perform the opening action, thereby realizing the vacuum arc extinguishing and opening of the environmentally friendly load switch, with better arc extinguishing performance, better insulation performance, strong breaking capacity and higher safety. Therefore, the environmentally friendly load switch has the advantages of simple structure, stable and reliable performance, strong breaking capacity, small size, good insulation performance, high safety and modularization.

[0006] In particular, the conductive member includes a rotating shaft rotatably arranged on a support frame, two conductive sheets linked to the rotating shaft and matched with the isolating knife, and a cam linked to the rotating shaft and matched with the opening member, one end of the two conductive sheets has a conductive portion extending on both sides of the static contact and linked with the isolating knife, when the isolating knife performs the opening action, the two conductive sheets move with the isolating knife and drive the cam to move, and the cam drives the opening member to perform the opening action. The isolating knife drives the two conductive sheets to move, the two conductive sheets drive the rotating shaft to rotate, the rotating shaft drives the cam to move, the cam drives the opening member to move, and the opening member drives the pull rod to perform the opening action, thereby realizing the vacuum arc extinguishing and opening of the environmentally friendly load switch, with better arc extinguishing performance and better insulation performance.

[0007] In particular, the conductive part is provided with a closing contact slope and an opening contact slope respectively matched with the isolating knife on both sides, thereby ensuring that the isolating knife can reliably drive the conductive part to move, which is beneficial to improving the working reliability of the environmentally friendly load switch.

[0008] In particular, a limit plate is provided on the rotating shaft, the torsion spring is mounted on the rotating shaft, one end of the torsion spring is engaged with the limit plate, and the other end of the torsion spring is engaged with the support frame. The torsion spring is engaged between the support frame and the limit plate, thereby ensuring that the rotating shaft can be reliably reset, which is beneficial to improving the working reliability of the environmentally friendly load switch.

[0009] In particular, a conductive bolt is arranged between the two conductive sheets, and a soft connection is provided between the conductive bolt and the pull rod. The two conductive sheets are connected to the pull rod of the vacuum interrupter through the soft connection, thereby ensuring a more reliable electrical connection between the two conductive sheets and the pull rod.

[0010] In particular, the opening member includes a support shaft rotatably arranged on a mechanism frame, two opening plates rotatably arranged on the support shaft, a driving shaft arranged on one end of the two opening plates and matched with a cam, and a latch arranged between the other end of the two opening plates and a pull rod, a roller matched with the cam is arranged on the driving shaft, and an arc surface groove matched with the roller is arranged on the cam. When the isolation knife performs the opening action, the two conductive plates move with the isolation knife and drive the cam to move, and the arc groove of the cam is buckled on the roller, and the linkage cooperation between the two opening plates and the cam is formed. The conductive member drives the roller of the opening member to move through the cam, and the roller drives the two opening plates to rotate, and the two opening plates pull the pull rod to perform the opening action, thereby realizing the opening of the vacuum interrupter. Thereby, the transmission of the conductive member and the opening member can be ensured to be more reliable.

[0011] In particular, the fixed beams are respectively provided with insulating isolation plates separating the three groups of stationary contact assemblies. The insulating isolation plates can increase the insulation spacing between the three groups of stationary contact assemblies, and the interphase insulation performance is better.

[0012] In particular, the grounding contact assembly includes a grounding support plate arranged on the mechanism frame, a grounding conductive bar arranged on the grounding support plate, and three grounding contacts respectively arranged on the grounding conductive bar and matched with three isolating blades, and three buffer pads respectively arranged on the grounding support plate corresponding to the three grounding contacts and matched with the three isolating blades. The grounding contact assembly adopts a modular structural design, which can realize the modular assembly of the environmentally friendly load switch, and the buffer pad plays a buffering role on the isolating blade, which can ensure that the isolating blade and the grounding contact can be reliably in contact.

[0013] In particular, the ground support plate is provided with a support plate, and three protective covers are respectively provided on the support plate corresponding to the three ground contacts, and the three protective covers extend from the ground contacts toward the conductive member, and an insulating isolation groove matching the movement trajectory of the isolation knife is provided in the protective cover. The three protective covers can increase the insulation distance between the three isolation knives, and the interphase insulation performance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a stereogram of an embodiment of the present invention.

[0015] Figure 2 This is an exploded view of an embodiment of the present invention.

[0016] Figure 3 It is a structural diagram of the closing process of an embodiment of the present invention.

[0017] Figure 4 It is a structural diagram of the opening process of an embodiment of the present invention.

[0018] Figure 5It is a stereoscopic diagram of a static contact assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] like Figures 1 to 5As shown, the embodiment of the present invention is an environmentally friendly load switch, including a mechanism frame 10, a main shaft 11 rotatably arranged on the mechanism frame 10, three insulators 12 respectively arranged on the mechanism frame 10, three isolating knives 14 respectively rotatably arranged on contact seats 13 of the three insulators 12, three groups of crank arm assemblies 15 that cooperate with the main shaft 10 and are used to drive the three isolating knives 14 to perform opening and closing actions, a grounding contact assembly 20 arranged on the mechanism frame 10 and matched with the three isolating knives 14, and three groups of static contact assemblies 30 arranged on the mechanism frame 10 and matched with the three isolating knives 14, wherein the static contact assembly 30 includes a conductive busbar 31 arranged on a fixed beam 101 of the mechanism frame 10. , a static contact 32 arranged on one end of the conductive busbar 31 and cooperating with the isolating knife 14, a vacuum arc chamber 33 arranged on the conductive busbar 31, a support frame 34 arranged on the fixed beam 101, a conductive member 35 rotatably arranged on the support frame 34 and electrically connected to the vacuum arc chamber 33, a torsion spring 36 arranged between the conductive member 35 and the support frame 34, and a disconnecting member 37 rotatably arranged on the support frame 34 and used to drive the pull rod 331 of the vacuum arc chamber 33 to perform a disconnecting action. When the isolating knife 14 performs a disconnecting action, the conductive member 35 moves with the isolating knife 14 and drives the disconnecting member 37 to move, and the disconnecting member 37 drives the pull rod 331 of the vacuum arc chamber 33 to perform a disconnecting action. The conductive member 35 includes a rotating shaft 351 rotatably arranged on the support frame 34, two conductive sheets 352 linked to the rotating shaft 351 and matched with the isolating knife 14, and a cam 353 linked to the rotating shaft 351 and matched with the opening member 37. One end of the two conductive sheets 352 has a conductive portion 3521 extending on both sides of the static contact 32 and linked with the isolating knife 14. When the isolating knife 14 performs the opening action, the two conductive sheets 352 move with the isolating knife 14 and drive the cam 353 to move, and the cam 353 drives the opening member 37 to perform the opening action. The isolating knife drives the two conductive sheets to move, the two conductive sheets drive the rotating shaft to rotate, the rotating shaft drives the cam to move, the cam drives the opening member to move, and the opening member drives the pull rod to perform the opening action, thereby realizing the vacuum arc extinguishing and opening of the environmentally friendly load switch, with better arc extinguishing performance and better insulation performance. The conductive part 3521 is provided with a closing contact slope 3522 and an opening contact slope 3523 respectively on both sides thereof, which cooperate with the isolating knife 14. The conductive part is provided with a closing contact slope and an opening contact slope respectively, which cooperate with the isolating knife, so as to ensure that the isolating knife can reliably drive the conductive part to move, thereby facilitating improving the working reliability of the environmentally friendly load switch.The gate-breaking member 37 includes a support shaft 371 rotatably arranged on the mechanism frame 10, two gate-breaking plates 372 rotatably arranged on the support shaft 371, a driving shaft 373 arranged on one end of the two gate-breaking plates 372 and matched with the cam 353, and a pin 374 arranged between the other end of the two gate-breaking plates 372 and the pull rod 331. The driving shaft 373 is provided with a roller 375 matched with the cam 353, and the cam 353 is provided with an arc groove 3531 matched with the roller 375. When the isolation knife 14 performs the gate-breaking action, the two conductive plates 351 move with the isolation knife 14 and drive the cam 353 to move. The arc groove 3531 of the cam 353 is buckled on the roller 375, and constitutes a linkage cooperation between the two gate-breaking plates 372 and the cam 353. The conductive member drives the roller of the opening member through the cam, and the roller drives the two opening plates to rotate, and the two opening plates pull the pull rod to perform the opening action, thereby realizing the opening of the vacuum interrupter. Thereby, the transmission of the conductive member and the opening member can be ensured to be more reliable. A limit plate 354 is arranged on the rotating shaft 351, and the torsion spring 36 is sleeved on the rotating shaft 351. One end of the torsion spring 36 is engaged with the limit plate 354, and the other end of the torsion spring 36 is engaged with the support frame 34. The torsion spring is engaged between the support frame and the limit plate, thereby ensuring that the rotating shaft can be reliably reset, which is conducive to improving the working reliability of the environmentally friendly load switch. A conductive bolt 3524 is arranged between the two conductive plates 352, and a soft connection 38 is connected between the conductive bolt 3524 and the pull rod 331. The two conductive plates are connected to the pull rod of the vacuum interrupter through a soft connection, thereby ensuring that the electrical connection between the two conductive plates and the pull rod is more reliable. The fixed beam 101 is provided with insulating isolation plates 102 separating the three groups of stationary contact assemblies 30. The insulating isolation plates can increase the insulation distance between the three groups of stationary contact assemblies, and the interphase insulation performance is better.

[0020] like Figure 2 , 3As shown in Figure 4, the grounding contact assembly 20 includes a grounding support plate 21 arranged on the mechanism frame 10, a grounding conductive bar 22 arranged on the grounding support plate 21, and three grounding contacts 23 respectively arranged on the grounding conductive bar 22 and matched with three isolating blades 14. Three buffer pads 24 respectively matched with three isolating blades 14 are arranged on the grounding support plate 21 corresponding to the three grounding contacts 23. The grounding contact assembly adopts a modular structural design, which can realize the modular assembly of the environmentally friendly load switch, and the buffer pad plays a buffering role on the isolating blade, which can ensure that the isolating blade and the grounding contact can be reliably contacted. A support plate 25 is arranged on the grounding support plate 21, and three protective covers 26 are respectively arranged on the support plate 25 corresponding to the three grounding contacts 23. The three protective covers 26 extend from the grounding contact 23 to the conductive member 35, and the protective cover 26 is provided with an insulating isolation groove 261 matching the motion trajectory of the isolating blade 14. The three protective covers can increase the insulation distance between the three isolating blades, and the phase insulation performance is better.

[0021] The static contact assembly of the environmentally friendly load switch adopts a modular structural design, which is compact and smaller in size. When closing the switch, the vacuum interrupter is in a normally closed state, and the main shaft drives the isolating knife to move. The isolating knife first moves the conductive part (the isolating knife contacts the conductive part first), and then the isolating knife contacts the static contact, thereby realizing the connection between the isolating knife and the static contact. When opening the switch, the main shaft drives the isolating knife to perform the opening action. When the isolating knife contacts the conductive part, the conductive part connects the power supply between the isolating knife and the vacuum interrupter. When the isolating knife drives the conductive part to move (the isolating knife and the static contact are separated), the conductive part drives the opening part to move, and the opening part pulls the pull rod of the vacuum interrupter to perform the opening action, thereby realizing the vacuum arc extinguishing and opening of the environmentally friendly load switch, with better arc extinguishing performance, strong breaking capacity, better insulation performance, and higher safety. Therefore, the environmentally friendly load switch has the advantages of simple structure, stable and reliable performance, strong breaking capacity, small size, good insulation performance, high safety, and modularization.

Claims

1. An environmentally friendly load switch, comprising a mechanism frame, a main shaft rotatably arranged on the mechanism frame, three insulators respectively arranged on the mechanism frame, three isolating knives respectively rotatably arranged on the contact seats of the three insulators, three groups of crank arm assemblies that cooperate with the main shaft and are used to drive the three isolating knives to perform opening and closing actions, a grounding contact assembly arranged on the mechanism frame and matched with the three isolating knives, and three groups of static contact assemblies arranged on the mechanism frame and matched with the three isolating knives, characterized in that: The static contact assembly includes a conductive busbar arranged on a fixed beam of a mechanical frame, a static contact arranged on one end of the conductive busbar and matched with an isolating knife, a vacuum arc extinguishing chamber arranged on the conductive busbar, a support frame arranged on the fixed beam, a conductive member rotatably arranged on the support frame and electrically connected to the vacuum arc extinguishing chamber, a torsion spring arranged between the conductive member and the support frame, and a disconnecting member rotatably arranged on the support frame and used to drive a pull rod of the vacuum arc extinguishing chamber to perform a disconnecting action. When the isolating knife performs a disconnecting action, the conductive member moves with the isolating knife and drives the disconnecting member to move, and the disconnecting member drives the pull rod of the vacuum arc extinguishing chamber to perform a disconnecting action.

2. The environmentally friendly load switch according to claim 1, characterized in that: The conductive member includes a rotating shaft rotatably arranged on a support frame, two conductive sheets linked to the rotating shaft and matched with an isolating knife, and a cam linked to the rotating shaft and matched with a switch-off member. One end of the two conductive sheets has a conductive portion extending on both sides of the static contact and linked with the isolating knife. When the isolating knife performs a switch-off action, the two conductive sheets move with the isolating knife and drive the cam to move, and the cam drives the switch-off member to perform a switch-off action.

3. The environmentally friendly load switch according to claim 2, characterized in that: The two sides of the conductive part are respectively provided with a closing contact slope and an opening contact slope which match with the isolating knife.

4. The environmentally friendly load switch according to claim 2 or 3, characterized in that: A limit plate is linked to the rotating shaft, the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is clamped on the limit plate, and the other end of the torsion spring is clamped on the support frame.

5. The environmentally friendly load switch according to claim 2 or 3, characterized in that: A conductive bolt is arranged between the two conductive sheets, and a flexible connection is provided between the conductive bolt and the pull rod.

6. The environmentally friendly load switch according to claim 1, 2 or 3, characterized in that: The gate-breaking member includes a supporting shaft rotatably arranged on a mechanism frame, two gate-breaking plates rotatably arranged on the supporting shaft, a driving shaft arranged on one end of the two gate-breaking plates and cooperating with a cam, and a pin arranged between the other end of the two gate-breaking plates and a pull rod. A roller cooperating with the cam is arranged on the driving shaft, and an arcuate groove cooperating with the roller is arranged on the cam. When the isolating knife performs the gate-breaking action, the two conductive plates move with the isolating knife and drive the cam to move. The arcuate groove of the cam is buckled on the roller, and constitutes a linkage cooperation between the two gate-breaking plates and the cam.

7. The environmentally friendly load switch according to claim 1 or 2, characterized in that: The fixed beams are respectively provided with insulating isolation plates separating the three groups of stationary contact assemblies.

8. The environmentally friendly load switch according to claim 1 or 2, characterized in that: The grounding contact assembly includes a grounding support plate arranged on a machine frame, a grounding conductive bar arranged on the grounding support plate, and three grounding contacts respectively arranged on the grounding conductive bar and matched with three isolation knives. Three buffer pads matching with the three isolation knives are respectively arranged on the grounding support plate corresponding to the three grounding contacts.

9. The environmentally friendly load switch according to claim 8, characterized in that: A support plate is provided on the ground support plate, and three protective covers are respectively provided on the support plate corresponding to the three grounding contacts. The three protective covers extend from the grounding contacts toward the conductive parts, and insulating isolation grooves matching the movement trajectory of the isolation knife are provided in the protective covers.

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