Outdoor high voltage vacuum circuit breaker

Abstract

The invention discloses an outdoor high-voltage vacuum circuit breaker, comprising a mechanism box and three poles mounted on the upper part of the mechanism box; each pole is provided with a vertical chamber inside, an upper conductive seat and a lower conductive seat are provided in the vertical chamber, an insulating rubber sleeve is fixed between the upper conductive seat and the lower conductive seat, the outer periphery of the insulating rubber sleeve is closely connected with the inner wall of the vertical chamber, a through hole for a conductive contact arm to pass through is provided in the center of the insulating rubber sleeve, a plurality of circumferentially distributed fan-shaped shields are integrally formed on the insulating rubber sleeve at the through hole, a plurality of fan-shaped shields under normal conditions are spliced ​​to close the through hole, and the upper end of the conductive contact arm is lower than the fan-shaped shield when it moves to the lowest position; the invention increases the creepage distance by arranging the insulating rubber sleeve between the upper conductive seat and the lower conductive seat in the vertical chamber, thereby effectively improving the use safety and having a good use effect.

Description

Technical Field

[0001] The invention relates to an outdoor high-voltage vacuum circuit breaker, belonging to the technical field of vacuum circuit breaker structure design. Background Art

[0002] With the continuous improvement of the technical level of vacuum circuit breakers, vacuum circuit breakers are increasingly widely used in power systems as switching devices for controlling and distributing electric energy, and the user departments have also put forward higher requirements for vacuum circuit breakers. In the prior art, in outdoor high-voltage vacuum circuit breakers with built-in isolation mechanisms, due to the limited internal space, the isolation mechanism has a small electrical gap and a short creepage distance after disconnection, which reduces the safety of outdoor high-voltage vacuum circuit breakers. Summary of the invention

[0003] In this regard, the present invention aims to provide an outdoor high-voltage vacuum circuit breaker with improved use safety.

[0004] The technical solution for achieving the purpose of the present invention is:

[0005] An outdoor high-voltage vacuum circuit breaker comprises a mechanism box and three poles mounted on the upper part of the mechanism box; each pole is provided with two relatively independent vertical chambers, the two vertical chambers are respectively provided with a vacuum interrupter and an isolation mechanism, each pole is provided with an inlet and an outlet on the outside, the isolation mechanism comprises an upper conductive seat and a lower conductive seat fixed in the vertical chamber with an upper and lower interval, and a conductive contact arm which can move up and down and is always connected to the lower conductive seat, one of the upper conductive seat and the lower conductive seat is connected to the inlet, and the other is electrically connected to the upper static contact of the vacuum interrupter through a conductive plate, the lower moving contact of the vacuum interrupter is electrically connected to the outlet, and the lower moving contact of the vacuum interrupter and the lower end of the conductive contact arm are respectively connected to the operating mechanism in the mechanism box through a first insulating pull rod and a second insulating pull rod;

[0006] An insulating rubber sleeve is fixed between the upper conductive seat and the lower conductive seat in the vertical chamber, the outer periphery of the insulating rubber sleeve is tightly connected to the inner wall of the vertical chamber, a through hole is provided in the center of the insulating rubber sleeve for the conductive contact arm to pass through, a plurality of circumferentially distributed fan-shaped covers are integrally formed on the insulating rubber sleeve at the through hole, the plurality of fan-shaped covers are assembled to close the through hole under normal conditions, and the upper end of the conductive contact arm is lower than the fan-shaped covers when it moves to the lowest position.

[0007] In the above technical solution, the incoming line terminal is arranged at the top of the pole and connected to the upper conductive seat, and the conductive plate is a Z-shaped structure, connecting the lower conductive seat to the upper static contact of the vacuum interrupter.

[0008] In the above technical solution, the insulating rubber sleeve is made of silicone rubber.

[0009] In the above technical solution, a rubber pad is tightly arranged between the bottom end of the pole and the mechanism box, and the rubber pad has an annular folded portion extending into the vertical chamber, and the inner edge of the annular folded portion is tightly connected to the corresponding insulating pull rod.

[0010] In the above technical solution, the first insulating pull rod and the second insulating pull rod are provided with an annular groove which is tightly sleeved with the inner edge of the annular fold portion.

[0011] In the above technical solution, the first insulating pull rod and the second insulating pull rod each include an upper connecting rod and a lower insulating rod, and the lower end of the upper connecting rod is connected to the upper end of the lower insulating rod via an elastic connecting structure;

[0012] The elastic connection structure includes a connecting slot arranged at the upper end of the lower insulating rod, a baffle arranged at the lower end of the upper connecting rod and extending into the connecting slot, a limiting nut movably sleeved on the upper connecting rod and fixed at the upper port of the connecting slot, and a spiral compression spring arranged in the connecting slot, wherein the limiting nut restrains the baffle within the connecting slot, and the upper and lower ends of the spiral compression spring respectively abut against the bottom of the baffle and the bottom of the connecting slot.

[0013] In the above technical solution, the lower insulating rod is provided with a hollow portion and an annular boss which are spaced apart along the axial direction.

[0014] In the above technical solution, the pole is fixed to the upper part of the mechanism box by screws.

[0015] In the above technical solution, the vacuum interrupter and the pole are cast as one body;

[0016] A silicone rubber layer is provided on the outer wall of the pole, and a protruding umbrella skirt is provided on the surface of the silicone rubber layer.

[0017] The present invention has positive effects: in the outdoor high-voltage vacuum circuit breaker of the present invention, an insulating rubber sleeve is arranged between the upper conductive seat and the lower conductive seat in the vertical chamber, and a fan-shaped shield is arranged on the insulating rubber sleeve. When the conductive contact arm moves to the lowest position, that is, when the isolation mechanism is in a disconnected state, the fan-shaped shield is spliced ​​to form a barrier between the conductive contact arm and the upper conductive seat, and the creepage distance is increased by the arrangement of the insulating rubber sleeve, thereby effectively improving the safety of use and having a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of an outdoor high-voltage vacuum circuit breaker in the present invention;

[0019] Figure 2 It is a front view of the outdoor high-voltage vacuum circuit breaker of the present invention;

[0020] Figure 3 for Figure 2 Sectional view along the AA section line;

[0021] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 It is a three-dimensional diagram of the insulating rubber sleeve of the present invention;

[0023] Figure 6 for Figure 5 A cross-sectional view of the middle insulating rubber sleeve;

[0024] Figure 7 It is a schematic diagram of the structure of the rubber pad in the present invention;

[0025] Figure 8 It is a structural schematic diagram of the operating mechanism in the present invention;

[0026] Fig. 9 for Figure 8 A cross-sectional view of the operating mechanism shown in ;

[0027] Fig.10 for Figure 8 The schematic diagram of the structure of the operating mechanism shown in FIG. 1 with some parts omitted;

[0028] Fig.11 It is a three-dimensional structural diagram of the fixing bracket in the present invention.

[0029] The reference numerals shown in the figure are: 1-mechanism box; 11-operating mechanism; 12-driving main shaft; 13-mounting bracket; 14-transmission assembly; 141-fixed bracket; 142-strip sliding hole; 143-transmission crank arm; 144-fixed shaft; 145-roller; 146-transmission plate; 147-mounting shaft; 148-first connecting shaft; 149-second connecting shaft; 140-third connecting shaft; 15-oil buffer; 151-buffer piston; 2-pole; 3-vertical chamber; 4-vacuum arc extinguishing chamber; 5-isolation Separation mechanism; 51-upper conductive seat; 52-lower conductive seat; 53-conductive contact arm; 54-first insulating pull rod; 541-annular slot; 542-upper connecting rod; 543-lower insulating rod; 544-connecting slot; 545-stop; 546-limiting nut; 547-helical compression spring; 548-annular boss; 55-insulating rubber sleeve; 56-perforation; 57-fan-shaped cover; 6-inlet terminal; 7-outlet terminal; 8-silicon rubber layer; 81-umbrella skirt; 9-rubber pad; 91-annular folded portion; 10-conductive plate. DETAILED DESCRIPTION

[0030] The specific structure of the outdoor high-voltage vacuum circuit breaker of the present invention is described below in conjunction with the accompanying drawings:

[0031] An outdoor high voltage vacuum circuit breaker, such as Figures 1 to 6 As shown, it includes a mechanism box 1 and three poles 2 installed on the upper part of the mechanism box 1; each pole 2 is provided with two relatively independent vertical chambers 3, and the two vertical chambers 3 are respectively provided with a vacuum arc chamber 4 and an isolation mechanism 5, and each pole 2 is provided with an incoming line terminal 6 and an outgoing line terminal 7 on the outside, and the isolation mechanism 5 includes an upper conductive seat 51 and a lower conductive seat 52 fixed in the vertical chamber 3 at an upper and lower interval, and a conductive contact arm 53 that can move up and down and is always connected to the lower conductive seat 52, one of the upper conductive seat 51 and the lower conductive seat 52 is connected to the incoming line terminal 6, and the other is electrically connected to the upper end of the vacuum arc chamber 4 through a conductive plate 10, and the lower end moving contact of the vacuum arc chamber 4 is electrically connected to the outgoing line terminal 7, and the The moving contact at the lower end of the vacuum arc extinguishing chamber 4 and the lower end of the conductive contact arm 53 are connected to the operating mechanism 11 in the mechanism box 1 through the first insulating pull rod 54 and the second insulating pull rod respectively; an insulating rubber sleeve 55 is fixed between the upper conductive seat 51 and the lower conductive seat 52 in the vertical chamber 3, and the outer periphery of the insulating rubber sleeve 55 is tightly connected to the inner wall of the vertical chamber 3. A through hole 56 for the conductive contact arm 53 to pass through is provided in the center of the insulating rubber sleeve 55. A plurality of circumferentially distributed fan-shaped covers 57 are integrally formed on the insulating rubber sleeve 55 at the through hole 56. Under normal conditions, the plurality of fan-shaped covers 57 are spliced ​​together to close the through hole 56. When the conductive contact arm 53 moves to the lowest position, its upper end is lower than the fan-shaped covers 57. In the present embodiment, an insulating rubber sleeve 55 is provided between the upper conductive seat 51 and the lower conductive seat 52 in the vertical chamber 3, and a fan-shaped shield 57 is provided on the insulating rubber sleeve 55. When the conductive contact arm 53 moves to the lowest position, that is, when the isolation mechanism is in the disconnected state, the fan-shaped shield 57 is assembled between the conductive contact arm 53 and the upper conductive seat 51 to form a barrier, and the creepage distance is increased by the provision of the insulating rubber sleeve 55, thereby effectively improving the use safety and having a good use effect. In the present embodiment, the number of the fan-shaped shields 57 is four, and in actual operation, the number of the fan-shaped shields 57 can also be set to five or six. When the conductive contact arm 53 moves upward through the through hole 56, the fan-shaped shield 57 bends upward and adheres to the side of the conductive contact arm 53. When the conductive contact arm 53 moves downward and exits the through hole 56, the fan-shaped shield 57 is reset downward.

[0032] In a further technical solution of this embodiment, Figure 3 As shown, the incoming line terminal 6 is arranged at the top of the pole 2 and connected to the upper conductive seat 51, and the conductive plate 10 is a Z-shaped structure, connecting the lower conductive seat 52 to the static contact at the upper end of the vacuum arc extinguishing chamber 4. In this way, when the isolation mechanism is in the disconnected state, the lower conductive seat 52 and the conductive contact arm 53 are not charged.

[0033] The insulating rubber sleeve 55 in this embodiment is made of silicone rubber, which is the preferred material due to its high elasticity, heat resistance, insulation and other comprehensive characteristics.

[0034] In the further technical solution of this embodiment, combined with Figure 3 and Figure 7 As shown, a rubber pad 9 is tightly arranged between the bottom end of the pole 2 and the mechanism box 1, and the rubber pad 9 has an annular folded portion 91 extending into the vertical chamber 3, and the inner edge of the annular folded portion 91 is tightly connected to the corresponding insulating pull rod. The setting of the rubber pad 9 plays an isolation role to ensure the sealing of the vertical chamber, and the setting of the annular folded portion 91 can avoid excessive pulling of the rubber pad 9 during the up and down movement of the corresponding insulating pull rod; further, in order to realize the connection between the annular folded portion 91 and the corresponding insulating pull rod, in this embodiment, the first insulating pull rod and the second insulating pull rod have an annular groove 541 tightly sleeved with the inner edge of the annular folded portion 91, that is, the cooperation between the annular folded portion 91 and the annular groove 541 realizes a quick and reliable connection.

[0035] As a further improvement of this embodiment, Figure 3 and Figure 4 As shown, the first insulating pull rod and the second insulating pull rod each include an upper connecting rod 542 and a lower insulating rod 543, the lower end of the upper connecting rod 542 is connected to the upper end of the lower insulating rod 543 by an elastic connecting structure, and the setting of the elastic connecting structure enables each insulating pull rod to have axial elasticity, thereby playing an elastic buffering role when controlling the opening and closing of the switch, and better protecting the operating mechanism 11 in the mechanism box 1; the elastic connecting structure includes a connecting slot 544 provided at the upper end of the lower insulating rod 543, a stopper 545 provided at the lower end of the upper connecting rod 542 and extending into the connecting slot 544, and a stopper 545 movably sleeved on the upper connecting rod 542 and fixed to the connecting slot The limiting nut 546 at the upper end of 544 and the spiral compression spring 547 arranged in the connecting slot 544, through the limiting nut 546, the blocking platform 545 is restrained and restricted in the connecting slot 544 to achieve connection. When the lower insulating rod 543 is driven to move downward by the operating mechanism 11, the upper connecting rod 52 is driven to move downward through the cooperation of the blocking platform 545 and the limiting nut 546, and then the vacuum arc chamber disconnection / isolation mechanism is disconnected. The upper and lower ends of the spiral compression spring 547 are respectively abutted against the bottom of the blocking platform 545 and the bottom of the connecting slot 544, and the spiral compression spring provides elastic force for the elongation of the upper connecting rod 542 and the lower insulating rod 543 after compression.

[0036] In a further technical solution of this embodiment, Figure 3As shown, the lower insulating rod 543 is provided with hollow portions and annular bosses 548 spaced apart along the axial direction; the provision of the annular bosses 548 and the hollow portions can further increase the creepage distance and improve safety.

[0037] In this embodiment, the pole 2 is fixed to the upper part of the mechanism box 1 by screws. Specifically, the screws pass through the screw holes on the mechanism box 1 and match with the screw holes on the pole 2 .

[0038] In a specific implementation of the present embodiment, the vacuum interrupter 4 and the pole 2 are cast as one body, thus eliminating the manual assembly process and achieving a good fixed connection effect; a silicone rubber layer 8 is provided on the outer wall of the pole 2, and a protruding umbrella skirt 81 is provided on the surface of the silicone rubber layer 8. By providing the umbrella skirt 81 on the silicone rubber layer 8, the creepage distance is further increased, thereby improving its safety performance.

[0039] As a further implementation scheme in the above embodiment, Figures 8 to 11As shown, the operating mechanism includes a driving spindle 12, and the driving spindle 12 is connected to the first insulating pull rod 54 through a transmission assembly 14. When the driving spindle 12 moves back and forth, the first insulating pull rod 54 and the lower end moving contact are driven to move up and down through the transmission assembly 14; the transmission assembly 14 includes a fixed bracket 141, a transmission crank arm 143 and a transmission plate 146, the fixed bracket 141 is fixed in the mechanism box 1, and the transmission crank arm 143 is rotatably arranged on the fixed bracket 141 through a mounting shaft 147, and is connected to the first connecting shaft 148 and the second connecting shaft 149. They are respectively hinged to the driving main shaft 12 and one end of the transmission plate 146, and the other end of the transmission plate 146 is hinged to the bottom end of the first insulating pull rod 54 through the third connecting shaft 140, and the axis line connecting the axis center of the installation shaft 147 and the axis center of the second connecting shaft 149 and the axis line connecting the axis center of the second connecting shaft 149 and the axis center of the third connecting shaft 140 are always not less than 90 degrees. When the driving main shaft 12 moves back and forth, it drives the transmission crank arm 143 to rotate around the installation shaft 147, and drives the first insulating pull rod 54 and the moving contact to move up and down through the transmission plate 146. The structure of the operating mechanism in this embodiment is reasonably set up. When in use, when the operating mechanism is in action, the main shaft 12 is driven to move and drive the transmission crank arm 143 to rotate with the installation shaft 147 as the fulcrum, and then the transmission plate 146 is driven by the transmission crank arm 143 to transmit the force to the first insulating pull rod 54, pushing or pulling the first insulating pull rod 54 to move upward or downward, and then driving the lower end moving contact to move upward or downward; the operating mechanism in this embodiment is optimized in design, so it is smooth and flexible in action, not prone to jamming, and has good stability when in use. In addition, by limiting the axis of the installation shaft 147 and the axis of the second connecting shaft 149 The axis connecting the axis of the second connecting shaft 149 and the axis of the third connecting shaft 140 is always not less than 90 degrees, avoiding the occurrence of a dead point of force when the angle reaches 90 degrees or less than 90 degrees, thereby ensuring smooth and flexible transmission and having a good use effect.

[0040] In a further technical solution of this embodiment, the operating mechanism also includes a switch-off buffer structure, which includes an oil buffer 15 fixed in the mechanism box 1 by a mounting bracket 13 and a resistance portion arranged on the transmission crank arm 143, and the oil buffer 15 has a buffer piston 151 suitable for resisting with the resistance portion; during the circuit breaker opening process, the driving main shaft 12 resists with the buffer piston 151 through the resistance portion thereon when driving the transmission crank arm 143 to rotate, thereby playing a role of buffering and protecting the operating mechanism, thereby ensuring the service life of the operating mechanism.

[0041] Furthermore, the abutment portion includes a fixed shaft 144 fixed on the transmission arm 143 and a roller 145 sleeved on the fixed shaft 144; when the circuit breaker is opened, the roller 145 collides with the buffer piston 151 on the oil buffer 15 to perform buffering.

[0042] In a further technical solution of this embodiment, a strip sliding hole 142 extending in the up-down direction is provided on the fixed bracket 141, and the end of the third connecting shaft 140 forms a sliding fit with the strip sliding hole 142; the sliding fit between the strip sliding hole 142 and the third connecting shaft 140 enhances the guiding and limiting effect on the up-down movement of the first insulating pull rod 54.

[0043] However, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. An outdoor high-voltage vacuum circuit breaker, comprising a mechanism box (1) and three poles (2) mounted on the upper part of the mechanism box (1); each pole (2) is provided with two relatively independent vertical chambers (3), the two vertical chambers (3) are respectively provided with a vacuum interrupter (4) and an isolation mechanism (5), each pole (2) is provided with an inlet terminal (6) and an outlet terminal (7) outside, the isolation mechanism (5) comprising an upper conductive seat (51) and a lower conductive seat (52) fixed in the vertical chamber (3) at an interval, and a movable member (51) movable in an upward and downward direction and connected to the lower conductive seat (52) The invention relates to a conductive contact arm (53) which is always connected, wherein one of the upper conductive seat (51) and the lower conductive seat (52) is connected to the incoming line terminal (6), and the other is electrically connected to the upper static contact of the vacuum arc chamber (4) through a conductive plate (10), the lower moving contact of the vacuum arc chamber (4) is electrically connected to the outgoing line terminal (7), and the lower moving contact of the vacuum arc chamber (4) and the lower end of the conductive contact arm (53) are connected to the operating mechanism (11) in the mechanism box (1) through a first insulating pull rod (54) and a second insulating pull rod respectively; characterized in that: An insulating rubber sleeve (55) is fixed between the upper conductive seat (51) and the lower conductive seat (52) in the vertical chamber (3); the outer periphery of the insulating rubber sleeve (55) is closely connected to the inner wall of the vertical chamber (3); a through hole (56) for the conductive contact arm (53) to pass through is provided at the center of the insulating rubber sleeve (55); a plurality of fan-shaped shielding pieces (57) distributed along the circumferential direction are integrally formed on the insulating rubber sleeve (55) at the through hole (56); under normal conditions, the plurality of fan-shaped shielding pieces (57) are assembled to close the through hole (56); when the conductive contact arm (53) moves to the lowest position, its upper end is lower than the fan-shaped shielding piece (57); the insulating rubber sleeve (55) is made of silicone rubber; and the pole (2) is fixed to the upper part of the mechanism box (1) by screws.

2. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: The incoming line terminal (6) is arranged at the top end of the pole (2) and connected to the upper conductive seat (51); the conductive plate (10) is a Z-shaped structure, connecting the lower conductive seat (52) to the upper static contact of the vacuum interrupter (4).

3. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: A rubber pad (9) is tightly arranged between the bottom end of the pole (2) and the mechanism box (1), the rubber pad (9) having an annular folded portion (91) extending into the vertical chamber (3), the inner edge of the annular folded portion (91) being tightly connected to a corresponding insulating pull rod.

4. The outdoor high-voltage vacuum circuit breaker according to claim 3, characterized in that: The first insulating pull rod (54) and the second insulating pull rod are provided with an annular groove (541) which is tightly sleeved with the inner edge of the annular fold portion (91).

5. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: The first insulating pull rod (54) and the second insulating pull rod both comprise an upper connecting rod (542) and a lower insulating rod (543), and the lower end of the upper connecting rod (542) is connected to the upper end of the lower insulating rod (543) via an elastic connection structure; The elastic connection structure comprises a connection slot (544) arranged at the upper end of the lower insulating rod (543), a stopper (545) arranged at the lower end of the upper connection rod (542) and extending into the connection slot (544), a limit nut (546) movably sleeved on the upper connection rod (542) and fixed at the upper end of the connection slot (544), and a spiral compression spring (547) arranged in the connection slot (544), wherein the limit nut (546) blocks and limits the stopper (545) in the connection slot (544), and the upper and lower ends of the spiral compression spring (547) respectively abut against the bottom of the stopper (545) and the bottom of the connection slot (544).

6. The outdoor high-voltage vacuum circuit breaker according to claim 5, characterized in that: The lower insulating rod (543) is provided with a hollow portion and an annular boss (548) spaced apart in the axial direction.

7. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: The vacuum interrupter (4) and the pole (2) are cast as one piece; A silicone rubber layer (8) is provided on the outer wall of the pole (2), and a protruding umbrella skirt (81) is provided on the surface of the silicone rubber layer (8).

Images