A kind of emergency protection device for power distribution system circuit

Abstract

The purpose of the present invention is to propose an emergency protection device for the circuit of a distribution system, comprising a wiring device, the wiring device comprising a pull rod, a wiring box and a first wiring board, which can quickly cut off the power supply; the arc extinguishing device comprises an insulating plate, a conductive cover, a conductive column and a grid plate, and the grid plate and the conductive column with an annular structure make the arc extinguishing path diverse and extend the service life; the short-circuit protection device comprises a bracket, an iron core, an induction coil, a first movable frame, a second movable frame, a trigger and a switch, which can quickly cut off the circuit when a short circuit occurs in the circuit, thereby providing emergency protection for the circuit.

Description

Technical Field

[0001] The invention relates to the field of circuit protection, and in particular to an emergency protection device for a circuit of a power distribution system. Background Art

[0002] During the operation of the existing power distribution system, short circuit and overload phenomena are often prone to occur, so a circuit emergency protection device is needed to protect the circuit. The existing circuit emergency protection device can disconnect the circuit when a short circuit and overload occur in the circuit, but an arc will be generated when the circuit is disconnected. The high-temperature arc will melt the contacts between the lines and cause corrosion of the lines. Although the existing circuit emergency protection device is equipped with a special arc extinguishing device, the arc extinguishing path is single, which will cause corrosion and aging of the arc extinguishing path over a long period of time, resulting in poor arc extinguishing effect.

[0003] As proposed in CN202411006903.0, an intelligent emergency protection device for a distribution cabinet comprises a switch box, wherein an arc extinguishing chamber is separated from the switch box by a partition, an insulating box is arranged in the arc extinguishing chamber, a grid structure is arranged in the insulating box, the grid structure is composed of a fixed lower grid and a movable upper grid, the upper grid is mounted on a movable mounting plate, the movable mounting plate is restricted by a guide groove with an inclined groove, a movable elastic reset structure is arranged on the movable mounting plate, a movable bracket is mounted on the partition for lifting and lowering, the movable bracket is located below the iron pressure piece in the switch box, a voltage-breaking piece is arranged on the movable bracket, a heat absorbing box is arranged on the insulating box, heat absorbing liquid is arranged in the heat absorbing box, a movable bottom support with a piston is arranged at the bottom of the heat absorbing box, and a shunt pipe is arranged at the top of the heat absorbing box; the emergency protection device of the present invention is provided with an intelligent arc extinguishing chamber structure, which can temporarily improve the arc extinguishing efficiency when a short circuit occurs, but does not solve the above-mentioned problem.

[0004] The present invention can extinguish arcs through the conductive cover and the grid plate, and the annular structure makes the arc extinguishing path diverse, thereby extending the service life. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide an emergency protection device for the circuit of a power distribution system, which can extinguish arcs through the conductive cover and grid plate. The annular structure makes the arc extinguishing path diverse and prolongs the service life.

[0006] The present invention provides an emergency protection device for a power distribution system circuit, comprising a shell, a cover body hinged on the shell, the cover body is made of a transparent material, and further comprising a wiring device arranged at the upper end of the shell, which can quickly cut off the power supply, and a protection component arranged at the lower end of the shell, the protection component comprising a shell, a second wiring board, an arc extinguishing device, an overload protection device and a short-circuit protection device.

[0007] Furthermore, the shell is installed in the shell by means of a buckle provided at the upper end of the shell, and an annular groove is provided on the outer side of the shell, which corresponds to the buckle in the shell and can fix the shell and limit the upper and lower positions.

[0008] Furthermore, the wiring device includes a pull rod, a wiring box and a first wiring board. The upper end of the pull rod is hinged on the outer shell. The wiring box is arranged at the upper end of the outer shell and is located in front of the pull rod. The wiring box is provided with a slot corresponding to the pull rod. The wiring box is provided with a first wiring board and has a corresponding slot for connecting the first wiring board. The outer shell is provided with a slot corresponding to the wiring box, and buckles are provided on both sides of the slot.

[0009] Furthermore, the arc extinguishing device includes an insulating plate, a conductive cover, a conductive column and a grid plate, the insulating plate is arranged in the shell, the conductive cover is arranged on the insulating plate, the conductive column is slidably arranged on the insulating plate, and the grid plate is evenly installed on the insulating plate.

[0010] Furthermore, the grid plate is annular, and evenly distributed grooves are provided at the end of the grid plate, and the front end of the end of the grid plate is conical.

[0011] Furthermore, a conductive sheet is provided at the outer end of the conductive cover, a contact is provided at the inner side of the conductive cover to be connected to the conductive column circuit, and the front end of the conductive cover is tapered.

[0012] Furthermore, the short-circuit protection device includes a bracket, an iron core, an induction coil, a first movable frame, a second movable frame, a trigger and a switch. The bracket is arranged in the shell and is located behind the conductive column. The induction coil is arranged on the bracket. The induction coil is circuit-connected with the conductive column. The iron core is slidably installed on the bracket. A spring is provided between the iron core and the bracket. The middle part of the first movable frame is rotatably installed on the bracket. A torsion spring is provided between the first movable frame and the bracket. One end of the first movable frame is slidably connected to the conductive column. A corresponding slide groove is provided on the first movable frame. The second movable frame is rotatably installed on the bracket. A trigger is provided at the end of the second movable frame. A snap plate is provided on the trigger. The switch is rotatably installed on the shell. A torsion spring is provided between the switch and the shell. The lower end of the switch is connected to the second movable frame through a connecting rod.

[0013] Furthermore, a notch is provided on one side of the upper end of the switch, and the notches of the switches on the protection components on both sides are staggered with each other.

[0014] Furthermore, the overload protection device includes a bimetallic strip and a limit frame. The bimetallic strip is fixed in the shell. One side of the bimetallic strip is connected to the induction coil circuit through a wire, and the other side is connected to the second wiring board circuit. The limit frame is fixed to the lower end of the bimetallic strip and is located on the side of the trigger.

[0015] Beneficial effects: 1. The insulating plate is arranged in the shell, the conductive cover is arranged on the insulating plate, the conductive column is slidably arranged on the insulating plate, the grid plate is evenly installed on the insulating plate, the grid plate is annular, and the end of the grid plate is provided with evenly distributed grooves. The front end of the grid plate is conical, and the arc generated when the circuit is disconnected can be divided by the annular grid plate and the conductive cover, so that the arc disappears and the harm is reduced, and the path of the electric fire is diversified, thereby extending the service life of the emergency protection device.

[0016] The bracket is arranged in the shell, the induction coil is arranged on the bracket, the iron core is slidably installed on the bracket, a spring is arranged between the iron core and the bracket, the middle part of the first movable frame is rotatably installed on the bracket, a torsion spring is arranged between the first movable frame and the bracket, one end of the first movable frame is slidably connected with the conductive column, a corresponding slide groove is arranged on the first movable frame, the second movable frame is rotatably installed on the bracket, a trigger is arranged at the end of the second movable frame, a snap plate is arranged on the trigger, the switch is rotatably installed on the shell, a torsion spring is arranged between the switch and the shell, and the lower end of the switch is connected to the second movable frame through a connecting rod, and can sense whether a short circuit occurs in the circuit through the electromagnetic coil, thereby triggering the switch, and then cutting off the circuit, so as to perform emergency protection when the circuit is short-circuited.

[0017] The upper end of the pull rod is hinged on the outer shell, and the junction box is arranged at the upper end of the outer shell, in front of the pull rod. The junction box is provided with a slot corresponding to the pull rod, and a first terminal board is provided in the junction box, and a corresponding slot is opened to connect the first terminal board. The outer shell is provided with a slot corresponding to the junction box, and buckles are provided on both sides of the slot. The junction box can be quickly removed by the pull rod, thereby facilitating the replacement of the protection.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is an exploded view of the overall structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the overall structure of the shell of the present invention.

[0022] Figure 4 It is a schematic diagram of the overall structure of the wiring device of the present invention.

[0023] Figure 5 It is a cross-sectional view of the wiring device of the present invention.

[0024] Figure 6 is a cross-sectional view of the protection component of the present invention.

[0025] Figure 7It is a cross-sectional view of the arc extinguishing device of the present invention.

[0026] Figure 8 It is an exploded view of the short-circuit protection device of the present invention.

[0027] Figure numerals: outer shell 1; pull rod 2; junction box 3; first terminal block 4; cover body 5; shell 6; conductive sheet 7; insulating plate 8; conductive cover 9; conductive column 10; grid plate 11; bracket 12; iron core 13; induction coil 14; first mobile frame 15; second mobile frame 16; trigger 17; snap plate 18; connecting rod 19; switch 20; bimetallic strip 21; limit frame 22; second terminal block 23. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0029] The following describes a power distribution system circuit emergency protection device according to an embodiment of the present invention with reference to the accompanying drawings. Figure 1 - Figure 8 As shown, the emergency protection device for the power distribution system circuit includes a shell 1, on which a cover body 5 is hinged, and the cover body 5 is made of a transparent material, and also includes: a wiring device arranged at the upper end of the shell 1, which can quickly cut off the power supply, and a protection component arranged at the lower end of the shell 1, the protection component includes a shell 6, a second terminal block 23, an arc extinguishing device, an overload protection device and a short-circuit protection device. The shell 6 is installed in the shell 1 through a buckle provided at the upper end of the shell 1, and an annular groove is provided on the outer side of the shell 6, which corresponds to the buckle in the shell 1, and can fix the shell 6 and limit the upper and lower positions.

[0030] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the emergency protection device for the power distribution system circuit includes a wiring device, which includes a pull rod 2, a junction box 3 and a first terminal board 4. The upper end of the pull rod 2 is hinged on the shell 1, and the junction box 3 is arranged at the upper end of the shell 1, located in front of the pull rod 2. The junction box 3 is provided with a card slot corresponding to the pull rod 2, and the first terminal board 4 is provided in the junction box 3, and a corresponding slot is opened to connect the first terminal board 4. The shell 1 is provided with a slot corresponding to the junction box 3, and buckles are provided on both sides of the slot.

[0031] In a specific embodiment: when in use, the neutral wire and the live wire are connected and fixed to the junction box 3 through the first terminal block 4, and the junction box 3 is fixed to the housing 1 through the buckle installation on the housing 1;

[0032] When the protection component fails and needs to be replaced, the pull rod 2 can be pulled, so that the junction box 3 squeezes the buckle to deform the buckle, thereby separating from the housing 1.

[0033] like Figure 6 and Figure 7 As shown, the distribution system circuit emergency protection device includes an arc extinguishing device, which includes an insulating plate 8, a conductive cover 9, a conductive column 10 and a grid plate 11. The insulating plate 8 is arranged in the shell 6, the conductive cover 9 is arranged on the insulating plate 8, the conductive column 10 is slidably arranged on the insulating plate 8, and the grid plate 11 is evenly installed on the insulating plate 8. The grid plate 11 is annular, and the end of the grid plate 11 is provided with evenly distributed grooves. The end of the grid plate 11 and the front end of the conductive cover 9 are conical. A conductive sheet 7 is provided at the outer end of the conductive cover 9, and a contact is provided on the inner side of the conductive cover 9 to connect the circuit with the conductive column 10.

[0034] In a specific embodiment: when the circuit is disconnected (the contacts on the inner side of the conductive column 10 and the conductive cover 9 disconnect the circuit connection), an arc will be generated between the conductive column 10 and the conductive cover 9, and the arc will move through the grid plate 11 and the tapered portion of the conductive cover 9. During the movement, the arc will pass through more grid plates 11, thereby dividing the high-temperature large arc into smaller arcs with lower temperatures, thereby reducing damage to the conductive column 10 and the contacts on the inner side of the conductive cover 9. At the same time, the current will automatically seek a route with lower resistance to move, and the path passed by multiple arcs will be etched and vaporized, resulting in an increase in resistance. The annular grid plate 11 and the conductive cover 9 allow the arc to have multiple route options, thereby extending the service life of the arc extinguishing device.

[0035] like Figure 6 and Figure 8 As shown, the power distribution system circuit emergency protection device includes a short-circuit protection device, which includes a bracket 12, an iron core 13, an induction coil 14, a first mobile frame 15, a second mobile frame 16, a trigger 17 and a switch 20. The bracket 12 is arranged in the housing 6 and is located behind the conductive column 10. The induction coil 14 is arranged on the bracket 12. The induction coil 14 is connected to the conductive column 10 by circuit. The iron core 13 is slidably installed on the bracket 12. A spring is provided between the iron core 13 and the bracket 12. The middle part of the first mobile frame 15 is rotatably installed on the bracket 12. The first mobile frame 16 is provided with a spring between the iron core 13 and the bracket 12. A torsion spring is provided between the frame 15 and the bracket 12, one end of the first mobile frame 15 is slidably connected to the conductive column 10, a corresponding slide groove is provided on the first mobile frame 15, the second mobile frame 16 is rotatably mounted on the bracket 12, a trigger 17 is provided at the end of the second mobile frame 16, a snap plate 18 is provided on the trigger 17, the switch 20 is rotatably mounted on the housing 6, a torsion spring is provided between the switch 20 and the housing 6, the lower end of the switch 20 is connected to the second mobile frame 16 through a connecting rod 19, a notch is provided on one side of the upper end of the switch 20, and the notches of the switch 20 on the protection components on both sides are staggered with each other.

[0036] In a specific embodiment: during normal use, the switch 20 is upward, the trigger 17 is buckled at the end of the first mobile frame 15 through the buckle plate 18, and the second mobile frame 16 is limited, so that the switch 20 connected to the second mobile frame 16 through the connecting rod 19 cannot rotate under the action of the torsion spring, and the magnetic force generated by the current passing through the induction coil 14 cannot compress the spring to move the iron core 13;

[0037] When a short circuit occurs in the power distribution system circuit, the current in the line increases sharply to 50 to 100 times the normal current, so that the magnetic force generated by the induction coil 14 compresses the spring and pushes the iron core 13 to move, thereby pushing the trigger 17 to rotate, so that the snap plate 18 is separated from the first mobile frame 15, so that the first mobile frame 15 rotates and separates from the second mobile frame 16 under the action of the torsion spring, and at the same time, the switch 20 rotates under the action of the torsion spring, so that the second mobile frame 16 rotates upward, so that the trigger 17 is re-fastened on the first mobile frame 15 after the upward rotation through the snap plate 18. During the upward rotation of the first mobile frame 15, the conductive column 10 is driven to slide, so that the conductive column 10 is separated from the contact on the inner side of the conductive cover 9, and the circuit is cut off, thereby performing emergency protection on the circuit. When the switch 20 on the protection component on the neutral line side rotates and falls, it will drive the switch 20 on the protection component on the live line side to fall, thereby better performing emergency protection on the circuit;

[0038] When resetting, the switch 20 is manually turned upward, so that the second movable frame 16 drives the first movable frame 15 to rotate, so that the first movable frame 15 pushes the conductive column 10 to slide, so that the conductive column 10 is reconnected with the inner contact circuit of the conductive cover 9.

[0039] like Figure 6 As shown, the distribution system circuit emergency protection device includes an overload protection device, which includes a bimetallic strip 21 and a limit frame 22. The bimetallic strip 21 is fixed in the shell 6. One side of the bimetallic strip 21 is connected to the induction coil 14 circuit through a wire, and the other side is connected to the second wiring board circuit. The limit frame 22 is fixed to the lower end of the bimetallic strip 21 and is located on the side of the trigger 17.

[0040] In a specific embodiment: when the circuit is overloaded, the temperature of the bimetallic strip 21 increases. Since the metals on both sides of the bimetallic strip 21 have different thermal deformation rates, the bimetallic strip 21 bends to one side, thereby pulling the trigger 17 through the limit frame 22, thereby disconnecting the conductive column 10 from the contacts inside the conductive cover 9.

[0041] Working principle: When a short circuit occurs in the power distribution system circuit, the current in the line increases sharply to 50 to 100 times the normal current, so that the magnetic force generated by the induction coil 14 compresses the spring and pushes the iron core 13 to move, thereby pushing the trigger 17 to rotate, so that the snap plate 18 is separated from the first mobile frame 15, and the first mobile frame 15 is rotated and separated from the second mobile frame 16 under the action of the torsion spring. At the same time, the switch 20 rotates under the action of the torsion spring, so that the second mobile frame 16 rotates upward, so that the trigger 17 is re-fastened to the first mobile frame 15 after the upward rotation through the snap plate 18. During the upward rotation of the first mobile frame 15, the conductive column 10 will be driven to slide, so that the conductive column 10 will be separated from the contact on the inner side of the conductive cover 9, and the circuit will be cut off, thereby providing emergency protection for the circuit. When the switch 20 on the protection component on the neutral line side rotates and falls, it will drive the switch 20 on the protection component on the live line side to fall, thereby better providing emergency protection for the circuit. When an overload occurs, the temperature of the bimetallic strip 21 increases. Since the metals on both sides of the bimetallic strip 21 have different thermal deformation rates, the bimetallic strip 21 bends to one side, thereby pulling the trigger 17 through the limit frame 22, thereby disconnecting the conductive column 10 from the contacts on the inner side of the conductive cover 9. When the circuit is disconnected (the conductive column 10 and the contacts on the inner side of the conductive cover 9 are disconnected from the circuit), an arc will be generated between the conductive column 10 and the conductive cover 9, and the arc will move through the grid plate 11 and the tapered portion of the conductive cover 9. During the movement, the arc will pass through more grid plates 11, thereby splitting the high-temperature large arc into smaller arcs with lower temperatures, thereby reducing damage to the conductive column 10 and the contacts on the inner side of the conductive cover 9. At the same time, the current will automatically seek a route with lower resistance to move, and the path passed by multiple arcs will be etched and vaporized, thereby causing the resistance to increase. The annular grid plate 11 and the conductive cover 9 allow the arc to have multiple route options, thereby extending the service life of the arc extinguishing device.

Claims

1. An emergency protection device for a power distribution system circuit, comprising a housing (1), a cover (5) being hingedly connected to the housing (1), the cover (5) being made of a transparent material, and characterized in that: It also includes a wiring device arranged at the upper end of the housing (1); A protection assembly is arranged at the lower end of the housing (1), the protection assembly comprising a housing (6), a second terminal block (23), an arc extinguishing device, an overload protection device and a short circuit protection device, The wiring device comprises a pull rod (2), a wiring box (3) and a first wiring board (4); the upper end of the pull rod (2) is hinged on the housing (1); the wiring box (3) is arranged at the upper end of the housing (1) and is located in front of the pull rod (2); a card slot corresponding to the pull rod (2) is provided on the wiring box (3); a first wiring board (4) is provided in the wiring box (3) and a corresponding slot is opened for connecting the first wiring board (4); a slot corresponding to the wiring box (3) is provided on the housing (1), and buckles are provided on both sides of the slot; The short-circuit protection device comprises a bracket (12), an iron core (13), an induction coil (14), a first movable frame (15), a second movable frame (16), a trigger (17) and a switch (20); the bracket (12) is arranged in the housing (6) and is located behind the conductive column (10); the induction coil (14) is arranged on the bracket (12); the induction coil (14) and the conductive column (10) are connected in circuit; the iron core (13) is slidably mounted on the bracket (12); a spring is provided between the iron core (13) and the bracket (12); the middle part of the first movable frame (15) is rotatably mounted on the bracket (12); a torsion spring is provided between the first movable frame (15) and the bracket (12); One end of the movable frame (15) is slidably connected to the conductive column (10), a corresponding slide groove is provided on the first movable frame (15), the second movable frame (16) is rotatably mounted on the bracket (12), a trigger (17) is provided at the end of the second movable frame (16), a snap plate (18) is provided on the trigger (17), the snap plate (18) is buckled on the other end of the first movable frame (15), the switch (20) is rotatably mounted on the housing (6), a torsion spring is provided between the switch (20) and the housing (6), the lower end of the switch (20) is connected to the second movable frame (16) through a connecting rod (19), a notch is provided on one side of the upper end of the switch (20), and the notches of the switch (20) on the two side protection components are staggered.

2. A power distribution system circuit emergency protection device as claimed in claim 1, characterized in that: The shell (6) is installed in the shell (1) via a buckle provided at the upper end of the shell (1); an annular groove is provided on the outer side of the shell (6); the annular groove corresponds to the buckle in the shell (1), and can fix the shell (6) and limit its position up and down.

3. A power distribution system circuit emergency protection device as claimed in claim 1, characterized in that: The arc extinguishing device comprises an insulating plate (8), a conductive cover (9), a conductive column (10) and a grid plate (11); the insulating plate (8) is arranged in a housing (6), the conductive cover (9) is arranged on the insulating plate (8), the conductive column (10) is slidably arranged on the insulating plate (8), and the grid plate (11) is evenly installed on the insulating plate (8).

4. A power distribution system circuit emergency protection device as claimed in claim 3, characterized in that: The grid plate (11) is annular in shape, and evenly distributed grooves are provided at the end of the grid plate (11), and the front end of the end of the grid plate (11) is tapered.

5. A power distribution system circuit emergency protection device as claimed in claim 3, characterized in that: The outer end of the conductive cover (9) is provided with a conductive sheet (7), the inner side of the conductive cover (9) is provided with a contact point connected to the conductive column (10) in a circuit, and the front end of the conductive cover (9) is tapered.

6. A power distribution system circuit emergency protection device as claimed in claim 1, characterized in that: The overload protection device comprises a bimetallic strip (21) and a limit frame (22). The bimetallic strip (21) is fixed in the housing (6). One side of the bimetallic strip (21) is connected to the circuit of the induction coil (14) via a wire, and the other side is connected to the circuit of the second wiring board (23). The limit frame (22) is fixed to the lower end of the bimetallic strip (21) and is located on the side of the trigger (17).

Images