CN110706986A

CN110706986A - Distribution network automation safety switch

Info

Publication number: CN110706986A
Application number: CN201910995067.6A
Authority: CN
Inventors: 黄湛华
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-01-17

Abstract

The invention discloses a distribution network automation safety switch, which comprises an input end, a knife switch, an output end, a driving mechanism and a base, wherein when the safety switch is opened, if a breaker fails and is not cut off, the knife switch and the output end can generate electric arcs when the safety switch is cut off, the electric arcs have heat, the heat is transferred to a memory alloy plate in a rear knife switch, the memory alloy plate absorbs the heat and contracts to shorten, and a limiting rod loses the limitation on the rear knife switch and a front knife switch in the process of shortening the memory alloy plate; the rear knife switch can swing relative to the front knife switch; meanwhile, the limit fixture blocks slide out of the corresponding sliding grooves, when the rear knife switch in the knife switch is clamped on the clamping piece on the output end, the knife switch is closed, the knife switch is clamped through the cooperation of the limit blocks arranged on the output end and the limit fixture blocks arranged on the rear knife switch, the situation that the driving mechanism continues to drive the knife switch to swing upwards to open the knife switch, electric arcs are generated, and the switch is burnt out is avoided.

Description

Distribution network automation safety switch

Technical Field

The invention relates to the technical field of power equipment, in particular to a distribution network automatic safety switch.

Background

In the process of high-voltage circuit breaking maintenance or repair in distribution network automation, a circuit breaker connected with an electric wire and disconnectors on two sides of the circuit breaker are controlled to break the circuit, but the operation sequence is strictly regulated. When power is off, the breaker is tripped, and under the condition that the breaker is checked and confirmed to be disconnected, the load side disconnecting switch is pulled first, and then the power supply side disconnecting switch is pulled; when power is transmitted, the power supply side disconnecting switch is firstly switched on, then the load side disconnecting switch is switched on, and then the circuit breaker is switched on; generally, after a circuit breaker is cut off, a line is cut off, but the circuit breaker cannot visually determine whether the circuit breaker is cut off, so that a disconnecting switch of a switch can be visually determined to be turned off or turned on after the circuit breaker is cut off, if the circuit breaker breaks down after the circuit breaker is cut off in the operation process, the circuit breaker is not cut off, an electric arc occurs when the disconnecting switch is cut off, and if the electric arc is large, mechanical damage or electric injury to an operator can be caused.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a distribution network automatic safety switch which can automatically close the arc after the arc is generated.

In order to solve the technical problems, the invention provides a distribution network automation safety switch which comprises an input end, a switch blade, a first insulator, an output end, second insulators, a driving mechanism and a base, wherein the base is provided with two symmetrically distributed supporting platforms, and the two second insulators are symmetrically and fixedly arranged on the upper sides of the two supporting platforms; the input end is arranged on the upper side of one of the second insulators, and the output end is arranged on the upper side of the other second insulator; one end of the switch blade is mounted on the input end in a hinged mode, and the other end of the switch blade is matched with the output end; the driving mechanism is installed on the base, the upper end of the first insulator is installed on the knife switch in a hinged mode, the lower end of the first insulator is installed on the driving mechanism, and the driving mechanism is used for driving the first insulator to move upwards.

Wherein the knife switch comprises a front knife switch, a driving spring, a mounting plate, a limiting rod, a limiting plate, a driving plate spring, an arc-shaped limiting block, a rear knife switch, a memory alloy plate, a driving plate, a limiting clamping block, a triggering plate, a reset plate spring and a limiting block,

the input end is provided with a fixing piece, the front knife switch comprises two knife switch blades, and the upper end and the lower end of each of the two knife switch blades are fixedly connected through a plurality of uniformly distributed connecting blocks; one end of one of the blades is provided with a seventh fixing hole, and the end of the blade, which is not provided with the seventh fixing hole, is arranged on the fixing sheet on the input end in a hinged manner;

a ninth fixing hole is formed in one end of the rear knife switch, a square through hole is formed in the side face of the rear knife switch, a square opening is formed in one side of the square through hole, a fixing groove is formed in the other side of the square through hole, an installation cavity is formed in the inner end face of the fixing groove, an installation groove is formed in the upper end face of the installation cavity, and two sliding grooves are symmetrically formed in two sides of one end, away from the installation cavity, of the installation groove; the rear knife switch is arranged on the front knife switch through the matching of the ninth fixing hole and the seventh fixing hole formed on the front knife switch; a driving plate spring is arranged between the front knife switch and the rear knife switch; and the front knife switch is provided with a limiting plate.

The arc-shaped limiting block is provided with a limiting groove, and the side surface of the arc-shaped limiting block is fixedly arranged on one of the two blades on the front knife switch and is positioned between the two blades; the circle center of the arc-shaped limiting block is positioned on a hinge axis of the front knife switch and the rear knife switch;

one end of the limiting rod is installed on one side of the rear switch blade through a guide shell, and the other end of the limiting rod sequentially penetrates through a square opening, a square through opening and a fixing groove formed in the rear switch blade and is located in the installation cavity; and one end of the limiting rod, which is positioned at the outer side of the rear knife switch, is matched with the limiting groove on the arc-shaped limiting block.

The mounting plate is fixedly mounted on the limiting rod and is positioned in a square through hole formed in the rear knife switch; the mounting panel with square opening that opens on the back plug-in strip is close to install drive spring between the terminal surface of preceding plug-in strip.

The driving plate is arranged at one end, located in an installation cavity formed in the rear knife switch, of the limiting rod, and is close to one end, close to the fixing groove, of the installation cavity; and a memory alloy plate is arranged between the drive plate and the other end in the mounting cavity, one end of the memory alloy plate is fixedly arranged on the mounting cavity, and the other end of the memory alloy plate is in contact fit with the drive plate.

The trigger device comprises a trigger plate, a limit fixture block, a rear knife switch and a rear knife switch, wherein one end of the trigger plate is provided with symmetrically distributed drive inclined planes, the other end of the trigger plate is fixedly arranged at the upper end of the drive plate, the trigger plate is positioned in the mounting groove, the lower side of one end of the limit fixture block is provided with a trigger inclined plane, the other end of the limit fixture block is provided with a transmission inclined plane, the two limit fixture blocks are symmetrically arranged in two slide grooves formed in the rear knife switch, and the two limit fixture blocks are in sliding fit with the two slide grooves; and the transmission inclined planes on the two limiting clamping blocks are matched with the two driving inclined planes on the trigger plate.

The output end is provided with a clamping piece, two limiting blocks are symmetrically arranged on the clamping piece, the two limiting blocks are matched with the two limiting clamping blocks, and the clamping piece is matched with one end, far away from the front knife, of the rear knife; eight fifth fixing holes are symmetrically formed in the clamping sheet, two elastic sheets are symmetrically mounted on the clamping sheet through the eight fifth fixing holes in the clamping sheet, and the two elastic sheets are fixedly connected with the corresponding fifth fixing holes through bolts and nuts; the two elastic pieces are matched with one end of the switch blade far away from the front switch blade.

The driving mechanism comprises a swinging shaft, supporting blocks, a connecting plate and a tray, wherein the swinging shaft is installed on the base through the two supporting blocks, one end of the connecting plate is fixedly installed on the swinging shaft, the tray is installed at the other end of the connecting plate in a hinged mode, and the first insulator is installed on the tray.

Wherein, install the connecting axle between two blades in the preceding plug-in strip, the lower extreme fixed mounting of connecting rod is in on the first insulator, the upper end of connecting rod is installed through normal running fit on the connecting axle.

The upper end of the second insulator is provided with two threaded holes; two second fixing holes are symmetrically formed in one end, close to the fixing piece, of the input end; the input end and the corresponding second insulator are fixed through two bolts, and one ends of the two bolts with threads penetrate through the second fixing hole in the input end to be in threaded fit with the two threaded holes in the corresponding second insulator; two sixth fixing holes are symmetrically formed in one end, close to the clamping piece, of the output end; the output end and the corresponding second insulator are fixed through two bolts, and one end of each bolt with threads penetrates through a sixth fixing hole in the output end to be in threaded fit with two threaded holes in the corresponding second insulator.

Wherein, the fixing sheet arranged on the input end is provided with a first fixing hole; and one ends of the two switch blades on the front switch blade, which are far away from the rear switch blade, are respectively provided with an eighth fixing hole, the front switch blade is connected with the fixing piece through a bolt and a nut, and the bolt penetrates through the first fixing hole on the fixing piece and the two eighth fixing holes on the front switch blade.

The input end is provided with a third fixing hole which is convenient for the connection of the input end and the electric wire; and the output end is provided with a fourth fixing hole which is convenient for the output end to be connected with an electric wire.

Two guide grooves are symmetrically formed in the upper end face and the lower end face of the sliding groove, and two guide blocks are symmetrically arranged on two sides of the limiting clamping block; the limiting clamping block is installed in the corresponding sliding groove through the matching of the two guide blocks and the two guide grooves.

And a clamping plate for preventing the switch blade from slipping off the output end is arranged at one end of the rear switch blade, which is far away from the front switch blade.

Compared with the prior art, the safety switch has the advantages that when the safety switch is opened, if the breaker breaks down and is not cut off, electric arcs can appear at the knife switch and the output end when the safety switch is cut off, when the electric arcs appear, the electric arcs have heat, the heat is transferred to the memory alloy plate in the rear knife switch through the heat dissipation of the electric arcs, the memory alloy plate absorbs the heat and contracts to be shortened, and the limiting rod loses the limiting on the rear knife switch and the front knife switch in the process of shortening the memory alloy plate; the rear knife switch can swing relative to the front knife switch; meanwhile, the limit fixture blocks slide out of the corresponding sliding grooves, when the rear knife switch in the knife switch is clamped on the clamping piece on the output end, the knife switch is closed, the knife switch is clamped through the cooperation of the limit blocks arranged on the output end and the limit fixture blocks arranged on the rear knife switch, the situation that the driving mechanism continues to drive the knife switch to swing upwards to open the knife switch, electric arcs are generated, and the switch is burnt out is avoided.

Drawings

Fig. 1 is a schematic perspective view of an automatic safety switch of a distribution network according to an embodiment of the present invention.

Fig. 2 is a schematic side view of an automatic safety switch of a distribution network according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a base in an embodiment of the invention.

Fig. 4 is a schematic structural view of a drive mechanism in the embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a first insulator in an embodiment of the invention.

Fig. 6 is a schematic structural diagram of a second insulator in the embodiment of the present invention.

Fig. 7 is a schematic view of the installation of the blade in the embodiment of the present invention.

Fig. 8 is a schematic structural diagram of an input terminal in an embodiment of the invention.

Fig. 9 is a schematic structural diagram of an output terminal in an embodiment of the present invention.

Fig. 10 is a schematic view showing the installation of the elastic sheet in the embodiment of the present invention.

FIG. 11 is a schematic view of the structure of an elastic sheet according to an embodiment of the present invention.

Fig. 12 is a schematic structural diagram of a front blade according to an embodiment of the present invention.

Fig. 13 is a schematic view of the installation of the driving plate spring in the embodiment of the present invention.

FIG. 14 is a schematic view of the installation of a stop lever according to an embodiment of the invention.

FIG. 15 is a schematic structural diagram of an arc-shaped limiting block in the embodiment of the present invention.

FIG. 16 is a schematic view showing the installation of a memory alloy plate according to an embodiment of the present invention.

Fig. 17 is a schematic structural diagram of a blade according to an embodiment of the present invention.

Fig. 18 is a schematic structural view of a chute in an embodiment of the invention.

Fig. 19 is a schematic view showing the installation of the drive spring in the embodiment of the present invention.

Fig. 20 is a schematic view illustrating the engagement between the driving plate and the limiting latch according to the embodiment of the present invention.

Fig. 21 is a schematic structural view of a driving plate in the embodiment of the present invention.

Fig. 22 is a schematic structural diagram of a limiting fixture block in the embodiment of the present invention.

Fig. 23 is a schematic view of the installation of the circuit breaker in the embodiment of the present invention.

Fig. 24 is a schematic view of the operation of the knife blade in the embodiment of the present invention.

Fig. 25 is a schematic diagram of the working principle of the limiting plate in the embodiment of the invention.

FIG. 26 is a schematic diagram illustrating the operation of the memory alloy plate according to the embodiment of the present invention.

Number designation in the figures: 1. an input end; 2. a knife switch; 3. a first insulator; 4. an output end; 5. a second insulator; 6. a drive mechanism; 7. a base; 8. a lumbar circular hole; 9. a support platform; 10. a swing shaft; 11. a support block; 12. a connecting plate; 13. a tray; 14. a connecting rod; 15. a threaded hole; 16. a fixing sheet; 17. a first fixing hole; 18. a second fixing hole; 19. a third fixing hole; 20. a fourth fixing hole; 21. a clamping piece; 22. a fifth fixing hole; 23. a sixth fixing hole; 24. an elastic sheet; 25. a limiting block; 26. a connecting shaft; 27. a seventh fixing hole; 28. an eighth fixing hole; 29. connecting blocks; 30. a limiting plate; 31. a drive plate spring; 32. an arc-shaped limiting block; 33. a rear knife switch; 34. a front knife switch; 35. clamping a plate; 36. a drive spring; 37. mounting a plate; 38. a limiting rod; 39. a limiting groove; 40. a memory alloy plate; 41. a drive plate; 42. a limiting clamping block; 43. a ninth fixing hole; 44. a square through opening; 45. a square opening; 46. a mounting cavity; 47. a chute; 48. mounting grooves; 49. fixing grooves; 50. a guide groove; 51. a trigger plate; 52. a reset plate spring; 53. a drive ramp; 54. a guide block; 55. a transmission bevel; 56. triggering the inclined plane; 57. a guide housing; 58. a blade; 59. a power supply side disconnecting switch; 60. a circuit breaker; 61. load side isolator.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a distribution network automation safety switch, which includes an input terminal 1, a switch blade 2, a first insulator 3, an output terminal 4, a second insulator 5, a driving mechanism 6, and a base 7, where as shown in fig. 3, the base 7 has two supporting platforms 9 symmetrically distributed thereon, and as shown in fig. 2, the two second insulators 5 are symmetrically and fixedly mounted on upper sides of the two supporting platforms 9 on the base 7; the input end 1 is arranged on the upper side of one second insulator 5 of the two second insulators 5, and the output end 4 is arranged on the upper side of the other second insulator 5 of the two second insulators 5; as shown in fig. 7, one end of the knife 2 is hinged to the input end 1, and the knife 2 can swing relative to the input end 1; the other end of the switch blade 2 is matched with the output end 4; the driving mechanism 6 is installed on the base 7, as shown in fig. 1, the upper end of the first insulator 3 is installed on the knife switch 2 in a hinged manner, and the lower end of the first insulator 3 is installed on the driving mechanism 6; the driving mechanism 6 drives the first insulator 3 to move upward; in the invention, the second insulator 5 is designed at the lower sides of the input end 1 and the output end 4, and because the insulators are nonconductors, the input end 1 and the output end 4 cannot transmit current to the base 7, and the base 7 is burnt out; the first insulator 3 is arranged between the driving mechanism 6 and the switch blade 2, and the current on the switch blade 2 can be prevented from being transmitted to the base 7 through the non-conductivity of the insulator, so that the base 7 is burnt out; the driving mechanism 6 can drive the switch blade 2 to swing upwards relative to the input end 1, and controls the switch states of the switch blade 2 and the output end 4, and further controls the power-on states of the input end 1 and the output end 4.

As shown in fig. 8, the input terminal 1 has a fixing piece 16 thereon.

As shown in fig. 7, the knife blade 2 includes a front knife blade 34, a driving spring 36, a mounting plate 37, a limiting rod 38, a limiting plate 30, a driving plate spring 31, an arc-shaped limiting block 32, a rear knife blade 33, a memory alloy plate 40, a driving plate 41, a limiting block 42, a trigger plate 51, a return plate spring 52 and a limiting block 25, wherein as shown in fig. 12, the front knife blade 34 is composed of two knife blade 2 pieces, and the upper and lower ends of the two knife blade 2 pieces are fixedly connected through a plurality of evenly distributed connecting blocks 29; one end of one of the two switch blades 2 is provided with a seventh fixing hole 27; as shown in fig. 7, the end of the front knife 34 not opened with the seventh fixing hole 27 is mounted on the fixing plate 16 on the input end 1 in a hinged manner; the front knife 34 can swing relative to the fixing piece 16; as shown in fig. 17, one end of the rear knife 33 is provided with a ninth fixing hole 43, a side surface of the rear knife 33 is provided with a square through hole 44, one side of the square through hole 44 is provided with a square opening 45, the other side of the square through hole 44 is provided with a fixing groove 49, an inner end surface of the fixing groove 49 is provided with a mounting cavity 46, as shown in fig. 19, an upper end surface of the mounting cavity 46 is provided with a mounting groove 48, and two sides of the mounting groove 48, which are far away from one end of the mounting cavity 46, are symmetrically provided with two sliding grooves 47; as shown in fig. 13, the rear blade 33 is mounted on the front blade 34 through the engagement of the ninth fixing hole 43 and the seventh fixing hole 27 formed in the front blade 34, and the ninth fixing hole 43 and the seventh fixing hole 27 are connected by a bolt and a nut; the front blade 34 and the rear blade 33 can swing relatively; as shown in fig. 13, a driving plate spring 31 is installed between the front blade 34 and the rear blade 33; the function of the driving plate spring 31 is that after the relative swing of the front blade 34 and the rear blade 33 is out of limit, the rear blade 33 can be pulled downwards by the pretension force of the driving plate spring 31, so that the rear blade 33 swings relative to the front blade 34; a limit plate 30 is arranged on the front knife switch 34, and the limit plate 30 can limit the relative swing angle of the front knife switch 34 and the rear knife switch 33; the limiting plate 30 is matched with the rear knife switch 33; as shown in fig. 15, the arc-shaped stopper 32 is provided with a stopper groove 39, and a side surface of the arc-shaped stopper 32 is fixedly mounted on one blade 2 of the two blades 2 of the front blade 34 and is located between the two blades 2. As shown in fig. 14, one end of the stopper rod 38 is mounted on one side of the rear knife 33 through the guide shell 57, and the other end of the stopper rod 38 passes through the square opening 45, the square opening 44 and the fixing groove 49 formed in the rear knife 33 in sequence and is located in the mounting cavity 46; one end of the limiting rod 38 positioned at the outer side of the rear knife switch 33 is matched with a limiting groove 39 on the arc-shaped limiting block 32; under the normal state, one end of the limiting rod 38, which is positioned at the outer side of the rear knife switch 33, is positioned in a limiting groove 39 formed in the arc-shaped limiting block 32, and the relative swing of the front knife switch 34 and the rear knife switch 33 is limited through the matching of the limiting groove 39 and the limiting rod 38. The circle center of the arc-shaped limiting block 32 designed by the invention is positioned on the hinge axis of the front knife switch 34 and the rear knife switch 33, the matched end of the limiting rod and the arc-shaped limiting block is always opposite to the inner arc surface of the arc-shaped limiting block in the rotating and swinging process of the front knife switch 34 and the rear knife switch 33 and cannot be separated from the inner arc surface of the arc-shaped limiting block, so that the limiting rod can be contacted with the inner arc surface of the arc-shaped limiting block after the memory alloy plate is cooled, when the generation of electric arc is low or the environmental temperature is low, the memory alloy plate is cooled and accelerated, the limiting rod is firstly contacted with the inner arc surface of the arc-shaped limiting block, then the limiting rod 38 is driven to swing along with the reset and swinging of the rear knife switch 33 relative to the front knife switch 34, the matched end of; until the limiting rod 38 is matched with the limiting groove 39, the driving spring 36 drives the limiting rod 38 to move so that the limiting rod 38 is matched with the limiting groove 39; the circle center of the arc-shaped limiting block 32 designed by the invention is positioned on the hinge axis of the front knife switch 34 and the rear knife switch 33, so that the limiting rod 38 is ensured to be opposite to the arc-shaped limiting block 32 in the swinging process, and the limiting rod is prevented from being separated from the arc-shaped limiting block too fast; as shown in fig. 19, the mounting plate 37 is fixedly mounted on the stopper rod 38, and the mounting plate 37 is located in the square opening 44 formed in the rear blade 33. As shown in fig. 16, a driving spring 36 is installed between the mounting plate 37 and the end surface of the square through hole 44 formed on the rear blade 33 near the front blade 34; the driving spring 36 has pre-pressure, the driving plate 41 is mounted on the limiting rod 38 at one end in the mounting cavity 46 opened on the rear knife 33, and the driving plate 41 is close to one end in the mounting cavity 46 close to the fixing groove 49; a memory alloy plate 40 is arranged between the driving plate 41 and the other end in the mounting cavity 46; one end of the memory alloy plate is fixedly arranged on the mounting cavity, and the other end of the memory alloy plate is in contact fit with the driving plate; the pre-stress of the drive spring 36 ensures that the drive plate on the stop lever 38 is always in contact with one end of the memory alloy plate. The memory alloy plate 40 has a two-way memory effect, the memory alloy plate 40 can recover the shape under the high-temperature state when being heated, and can recover the shape under the low-temperature state when being cooled, the memory alloy plate 40 designed by the invention can contract and shorten under the high-temperature state, and the memory alloy plate 40 can stretch and lengthen under the low-temperature state; in a low-temperature state, the longer memory alloy plate overcomes the pre-pressure of the driving spring to clamp one end of the limiting rod 38 matched with the arc-shaped limiting block 32 in the limiting groove 39; when the switch is opened, if an electric arc is generated between the output end 4 and the rear knife switch 33, the electric arc has heat, the heat is transmitted to the memory alloy plate 40 in the rear knife switch 33 through the heat dissipation of the electric arc, the memory alloy plate 40 contracts and shortens after absorbing the heat, in the process of shortening the memory alloy plate 40, the driving spring drives the driving plate 41 to move along one side of the memory alloy plate 40 in a clinging manner, the driving plate 41 moves to drive the limiting rod 38 to move, and the limiting rod 38 moves to enable one end, matched with the arc-shaped limiting block 32, of the limiting rod 38 to gradually separate from the limiting groove 39 on the arc-shaped limiting block 32; the limiting rod 38 loses the limitation on the rear knife switch 33 and the front knife switch 34; the rear blade 33 can swing with respect to the front blade 34. The design of the contact fit of the driving plate and the memory alloy plate is as follows: during the deformation of the memory alloy plate at high temperature and low temperature, one end of the memory alloy plate is fixed on the wall of the installation cavity, and the other end of the memory alloy plate can not be fixed, otherwise, the deformation of the memory alloy plate is blocked, and the deformation is not facilitated. The effect of drive spring is just guaranteeing that the drive plate can laminate with the memory alloy board all the time, turns into the motion of gag lever post with the deformation of memory alloy board. As shown in fig. 21, one end of the trigger plate 51 has symmetrically distributed driving inclined planes 53, the other end of the trigger plate 51 is fixedly mounted at the upper end of the driving plate 41, the trigger plate 51 is located in the mounting groove 48, and the lower side of one end of the limiting fixture block 42 has a triggering inclined plane 56, as shown in fig. 22, the other end of the limiting fixture block 42 has a transmission inclined plane 55, the two limiting fixture blocks 42 are symmetrically mounted in two sliding grooves 47 formed in the rear knife 33, and the two limiting fixture blocks 42 are in sliding fit with the two sliding grooves 47; as shown in fig. 20, the transmission inclined surfaces 55 on the two limiting latch blocks 42 are matched with the two driving inclined surfaces 53 on the trigger plate 51; in a normal state, the limiting fixture block 42 is positioned in the sliding groove 47 under the action of the corresponding reset plate spring 52, and the matching of the rear knife switch 33 and the output end 4 is not influenced; as shown in a of fig. 26, after the rear blade 33 and the output end 4 generate an arc, the memory alloy plate 40 contracts to move the driving plate 41, as shown in b of fig. 26, the driving plate 41 moves to drive the trigger plate 51 to move, the trigger plate 51 moves through the two driving inclined surfaces 53 thereon to drive the two limiting blocks 42 to move, so that one ends of the limiting blocks 42 having the triggering inclined surfaces 56 move out of the corresponding sliding grooves 47, as shown in a of fig. 24, the memory alloy plate 40 contracts to make the limiting rods 38 limiting the rear blade 33 and the front blade 34 separate from the limiting grooves 39 on the arc limiting blocks 32, the rear blade 33 swings relative to the front blade 34, as shown in b of fig. 24, one end of the rear blade 33 having the limiting blocks 42 is inserted between the clamping pieces 21 on the output end 4, and due to the limiting blocks 25 mounted on the clamping pieces 21, the limiting blocks 42 mounted on the rear blade 33 are not inserted into the clamping pieces 21 on the output end 4 yet in the process that the rear blade 33 swings downward When the clamping piece 21 slides out of the corresponding sliding slot 47, the limiting block 25 pushes the limiting block 42 through the triggering inclined surface 56 on the limiting block 42 to move the limiting block 42 inwards. The trigger plate 51 designed by the invention has elasticity, namely the trigger plate 51 is compressed when the limiting fixture block 42 moves inwards; after the limiting fixture block 42 completely crosses the limiting block 25 and is located on the lower side of the limiting block 25, the limiting fixture block 42 moves out again, the limiting block 25 contacts with the end, located on the outer side of the rear knife switch 33 and not provided with the trigger inclined plane 56, of the limiting fixture block 42, and the limiting block 42 is limited by the limiting block 25. In the invention, after the limiting block 42 is limited by the limiting block 25, if the switch blade 2 is continuously driven to swing upwards by the driving mechanism 6, as shown in fig. 25, the angle between the front switch blade 34 and the rear switch blade 33 becomes smaller, after the front switch blade 34 and the rear switch blade 33 are limited by the limiting plate 30, the front switch blade 34 and the rear switch blade 33 stop swinging relatively, at this time, if the switch blade 2 is continuously driven to swing upwards by the driving mechanism 6, the resistance of the motor for driving the driving mechanism 6 to work becomes larger, and after the resistance of the motor is sensed to become larger, the motor reversely drives the switch blade 2 to swing downwards by the driving mechanism 6.

As shown in fig. 9, the output end 4 is provided with a clamping piece 21, two limiting blocks 25 are symmetrically installed on the clamping piece 21, the two limiting blocks 25 are matched with the two limiting fixture blocks 42, and the clamping piece 21 is matched with one end of the rear knife 33 away from the front knife 34; eight fifth fixing holes 22 are symmetrically formed in the clamping piece 21, as shown in fig. 11 and 12, two elastic pieces 24 are symmetrically mounted on the clamping piece 21 through the eight fifth fixing holes 22 on the clamping piece 21, and the two elastic pieces 24 are fixedly connected with the corresponding fifth fixing holes 22 through bolts and nuts; the two elastic pieces 24 are matched with one end of the knife switch 2 far away from the front knife switch 34; the elastic piece 24 is used for clamping the rear knife blade 33 through the elastic piece 24 after the end of the rear knife blade 33, which is matched with the output end 4, is matched with the clamping piece 21 on the output end 4, so that the rear knife blade 33 is kept in a contact state with the output end 4.

As shown in fig. 3, a waist-round hole 8 is formed at each of four corners of the base 7 for fixing the base 7.

As shown in fig. 4, the driving mechanism 6 includes a swing shaft 10, support blocks 11, a connecting plate 12, and a tray 13, wherein the swing shaft 10 is mounted on the base 7 through the two support blocks 11, one end of the connecting plate 12 is fixedly mounted on the swing shaft 10, the other end of the connecting plate 12 is mounted with the tray 13 in a hinged manner, and the first insulator 3 is mounted on the tray 13; the swing of the swing shaft 10 drives the connecting plate 12 to swing, the connecting plate 12 swings to drive the tray 13 to swing, and the tray 13 swings to drive the first insulator 3 to swing. The swinging shaft is controlled to rotate by automatic driving equipment of the distribution network and can also be controlled to rotate manually.

As shown in fig. 5, a connecting shaft 26 is installed between two blades 2 of the front blade 34, a lower end of the connecting rod 14 is fixedly installed on the first insulator 3, and an upper end of the connecting rod 14 is installed on the connecting shaft 26 by a rotation fit.

As shown in fig. 6, the upper end of the second insulator 5 is provided with two threaded holes 15; two second fixing holes 18 are symmetrically formed at one end of the input end 1 close to the fixing piece 16; the input end 1 and the corresponding second insulator 5 are fixed through two bolts, and one ends of the two bolts with threads penetrate through a second fixing hole 18 on the input end 1 to be in threaded fit with two threaded holes 15 on the corresponding second insulator 5; two sixth fixing holes 23 are symmetrically formed in one end, close to the clamping piece 21, of the output end 4; the output end 4 and the corresponding second insulator 5 are fixed by two bolts, and one end of each bolt with threads passes through the sixth fixing hole 23 on the output end 4 to be in threaded fit with the two threaded holes 15 on the corresponding second insulator 5.

A first fixing hole 17 is arranged on a fixing piece 16 arranged on the input end 1; the two blades 2 on the front blade 34 are respectively provided with an eighth fixing hole 28 at one end far away from the rear blade 33, the front blade 34 is connected with the fixing plate 16 through a bolt and a nut, and the bolt passes through the eighth fixing hole 17 on the fixing plate 16 and the two eighth fixing holes 28 on the front blade 34.

The input end 1 is provided with a third fixing hole 19 for connecting the input end 1 with an electric wire; the output end 4 is provided with a fourth fixing hole 20 for connecting the output end 4 with an electric wire.

Two guide grooves 50 are symmetrically formed on the upper end surface and the lower end surface of the sliding groove 47, and two guide blocks 54 are symmetrically arranged on two sides of the limiting fixture block 42; the limiting fixture blocks 42 are installed in the corresponding sliding grooves 47 through the matching of the two guide blocks 54 and the two guide grooves 50.

The end of the rear knife 33 far from the front knife is provided with a clamping plate 35 for preventing the knife 2 from slipping off the output end 4.

The drive spring 36 is a compression spring, and in a normal state, the drive spring 36 has a pre-stress and the drive plate spring 31 has a pre-stress.

The specific working process of the invention is as follows: when the safety switch designed by the invention is used, the circuit breaker 60 can be tripped off firstly when the circuit is cut off, and under the condition that the circuit breaker 60 is checked and confirmed to be disconnected, the load side disconnecting switch 60 is pulled firstly, and then the power supply side disconnecting switch 56 is pulled; if the circuit breaker 60 is cut off in the operation process, the circuit breaker 60 breaks down, the circuit breaker 60 is not cut off, electric arcs can appear when the disconnecting switch is cut off, the electric arcs have heat, the heat is transmitted to the memory alloy plate 40 in the rear knife switch 33 through heat dissipation of the electric arcs, the memory alloy plate 40 shrinks and shortens after absorbing the heat, the drive plate 41 is driven to move towards one side of the memory alloy plate 40 in the process of shortening the memory alloy plate 40, the drive plate 41 moves to drive the limiting rod 38 to move, and the limiting rod 38 moves to enable one end, matched with the arc limiting block 32, of the limiting rod 38 to gradually separate from the limiting groove 39 in the arc limiting block 32; the limiting rod 38 loses the limitation on the rear knife switch 33 and the front knife switch 34; the rear blade 33 can swing with respect to the front blade 34; meanwhile, the driving plate 41 moves to drive the trigger plate 51 to move, the trigger plate 51 moves through the two driving inclined surfaces 53 thereon to drive the two limiting clamping blocks 42 to move, so that one end of the limiting clamping block 42 with the trigger inclined surface 56 moves out of the corresponding sliding groove 47, the limiting rod 38 limiting the rear knife 33 and the front knife 34 is separated from the limiting groove 39 on the arc limiting block 32 because the memory alloy plate 40 contracts, the rear knife 33 swings relative to the front knife 34, in the swinging process, one end of the rear knife 33 with the limiting clamping block 42 is provided with the clamping sheets 21 inserted into the output end 4, because the limiting block 25 is arranged on the clamping sheet 21, the limiting clamping block 42 arranged on the rear knife 33 slides out of the corresponding sliding groove 47 when the limiting clamping sheet 21 on the output end 4 is not inserted yet in the downward swinging process of the rear knife 33, the limiting clamping block 25 pushes the limiting clamping block 42 through the trigger inclined surface 56 on the limiting clamping block 42 to enable the limiting clamping block 42 to, when the limiting fixture block 42 completely crosses the limiting block 25 and is positioned on the lower side of the limiting block 25, the limiting fixture block 42 is moved out again, the limiting block 25 is in contact with one end, which is positioned on the outer side of the rear knife switch 33 and is not provided with the triggering inclined surface 56, of the limiting fixture block 42, and the limiting block 25 limits the limiting fixture block 42; when the limiting block 25 limits the limiting fixture block 42; after the rear knife switch contacts the clamping piece, the electric arc is extinguished, and the memory alloy plate begins to be cooled; if the blade 2 continues to be driven by the drive mechanism 6 to swing upwards, the angle between the front blade 34 and the rear blade 33 becomes smaller, when the front blade 34 and the rear blade 33 are limited by the limit plate 30, the front blade 34 and the rear blade 33 stop swinging relatively, and at this time, if the blade 2 is continuously driven to swing upwards by the driving mechanism 6, the resistance of the motor for driving the driving mechanism 6 to work becomes large, when the resistance of the motor is sensed to be increased, namely the current in the driving circuit is recognized to be increased, the driving mechanism 6 is stopped to be driven, and simultaneously the driving mechanism is driven to drive the switch blade 2 to swing downwards to move and balance again, after a period of time, the memory alloy plate 40 will expand again after being cooled, the expansion of the memory alloy plate 40 will reset the limiting fixture block 42, meanwhile, the end of the limiting rod 38, which is matched with the arc limiting block 32, is gradually inserted into the limiting groove 39 on the arc limiting block 32.

As can be seen from the above description of the embodiment, the embodiment of the present invention has the beneficial effects that when the safety switch is opened, if the breaker 60 fails and the breaker 60 is not cut off, the switch blade 2 and the output terminal 4 will generate an arc when the safety switch is turned off, and when the arc occurs, the arc has heat, the heat is transferred to the memory alloy plate 40 in the rear switch blade 33 by the heat dissipation of the arc, the memory alloy plate 40 will contract and shorten when absorbing the heat, and the limit rod 38 will lose the limit on the rear switch blade 33 and the front switch blade 34 when the memory alloy plate 40 shortens; the rear blade 33 can swing with respect to the front blade 34; meanwhile, the limiting fixture block 42 slides out of the corresponding chute 47, when the rear knife switch 33 in the knife switch 2 is clamped on the clamping piece 21 on the output end 4, the knife switch 2 is closed, and meanwhile, the knife switch 2 is clamped through the matching of the limiting block 25 arranged on the output end 4 and the limiting fixture block 42 on the rear knife switch 33, so that the driving mechanism 6 is prevented from continuously driving the knife switch 2 to swing upwards to open the knife switch 2, electric arcs are generated, and the switch is burnt out.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. The distribution network automatic safety switch is characterized by comprising an input end, a switch blade, a first insulator, an output end, second insulators, a driving mechanism and a base, wherein the base is provided with two supporting platforms which are symmetrically distributed, and the two second insulators are symmetrically and fixedly arranged on the upper sides of the two supporting platforms; the input end is arranged on the upper side of one of the second insulators, and the output end is arranged on the upper side of the other second insulator; one end of the switch blade is mounted on the input end in a hinged mode, and the other end of the switch blade is matched with the output end; the driving mechanism is installed on the base, the upper end of the first insulator is installed on the knife switch in a hinged mode, the lower end of the first insulator is installed on the driving mechanism, and the driving mechanism is used for driving the first insulator to move upwards.

2. The distribution network automation safety switch of claim 1, wherein the knife switch comprises a front knife switch, a driving spring, a mounting plate, a limiting rod, a limiting plate, a driving plate spring, an arc-shaped limiting block, a rear knife switch, a memory alloy plate, a driving plate, a limiting clamping block, a triggering plate, a reset plate spring and a limiting block,

3. The distribution network automation safety switch of claim 2, wherein the arc-shaped limiting block is provided with a limiting groove, and the side surface of the arc-shaped limiting block is fixedly installed on one of the two blades on the front blade and is located between the two blades; the circle center of the arc-shaped limiting block is positioned on a hinge axis of the front knife switch and the rear knife switch;

4. The distribution network automation safety switch of claim 3, wherein the mounting plate is fixedly mounted on the limiting rod and is located in a square opening formed in the rear knife switch; the mounting panel with square opening that opens on the back plug-in strip is close to install drive spring between the terminal surface of preceding plug-in strip.

5. The distribution network automation safety switch of claim 4, wherein the driving plate is mounted on the limiting rod at one end located in the mounting cavity opened on the rear knife switch, and the driving plate is close to one end of the mounting cavity close to the fixing groove; and a memory alloy plate is arranged between the drive plate and the other end in the mounting cavity, one end of the memory alloy plate is fixedly arranged on the mounting cavity, and the other end of the memory alloy plate is in contact fit with the drive plate.

6. The distribution network automation safety switch of claim 5, wherein one end of the trigger plate is provided with symmetrically distributed driving inclined planes, the other end of the trigger plate is fixedly installed at the upper end of the driving plate, the trigger plate is located in the installation groove, the lower side of one end of the limiting fixture block is provided with a triggering inclined plane, the other end of the limiting fixture block is provided with a transmission inclined plane, the two limiting fixture blocks are symmetrically installed in two sliding grooves formed in the rear knife switch, and the two limiting fixture blocks are in sliding fit with the two sliding grooves; and the transmission inclined planes on the two limiting clamping blocks are matched with the two driving inclined planes on the trigger plate.

7. The distribution network automation safety switch of claim 6, wherein the output end is provided with a clamping piece, two limiting blocks are symmetrically arranged on the clamping piece, the two limiting blocks are matched with the two limiting clamping blocks, and the clamping piece is matched with one end of the rear knife switch, which is far away from the front knife switch; eight fifth fixing holes are symmetrically formed in the clamping sheet, two elastic sheets are symmetrically mounted on the clamping sheet through the eight fifth fixing holes in the clamping sheet, and the two elastic sheets are fixedly connected with the corresponding fifth fixing holes through bolts and nuts; the two elastic pieces are matched with one end of the switch blade far away from the front switch blade.

8. The distribution network automation safety switch of claim 1, wherein the driving mechanism comprises a swing shaft, support blocks, a connecting plate and a tray, wherein the swing shaft is mounted on the base through two support blocks, one end of the connecting plate is fixedly mounted on the swing shaft, the other end of the connecting plate is mounted on the tray in a hinged manner, and the first insulator is mounted on the tray.

9. The distribution network automation safety switch of claim 2, wherein a connecting shaft is installed between two blades in the front blade, a lower end of a connecting rod is fixedly installed on the first insulator, and an upper end of the connecting rod is installed on the connecting shaft through a rotating fit.

10. The distribution network automation safety switch of claim 7, wherein the second insulator has two threaded holes opened at its upper end; two second fixing holes are symmetrically formed in one end, close to the fixing piece, of the input end; the input end and the corresponding second insulator are fixed through two bolts, and one ends of the two bolts with threads penetrate through the second fixing hole in the input end to be in threaded fit with the two threaded holes in the corresponding second insulator; two sixth fixing holes are symmetrically formed in one end, close to the clamping piece, of the output end; the output end and the corresponding second insulator are fixed through two bolts, and one end of each bolt with threads penetrates through a sixth fixing hole in the output end to be in threaded fit with two threaded holes in the corresponding second insulator.

11. The distribution network automation safety switch of claim 2, wherein the fixing plate mounted on the input end is provided with a first fixing hole; and one ends of the two switch blades on the front switch blade, which are far away from the rear switch blade, are respectively provided with an eighth fixing hole, the front switch blade is connected with the fixing piece through a bolt and a nut, and the bolt penetrates through the first fixing hole on the fixing piece and the two eighth fixing holes on the front switch blade.

12. The distribution network automation safety switch of claim 2, wherein the input end is provided with a third fixing hole for facilitating the connection of the input end with the wire; and the output end is provided with a fourth fixing hole which is convenient for the output end to be connected with an electric wire.

13. The distribution network automation safety switch of claim 2, wherein two guide grooves are symmetrically formed on the upper end surface and the lower end surface of the sliding groove, and two guide blocks are symmetrically arranged on two sides of the limiting clamping block; the limiting clamping block is installed in the corresponding sliding groove through the matching of the two guide blocks and the two guide grooves.

14. The distribution network automation safety switch of claim 2, wherein the end of the rear knife, which is far away from the front knife, is provided with a clamping plate for preventing the knife from slipping off the output end.