CN218385101U

CN218385101U - Direct current rapid protection device containing weight increasing grid piece

Info

Publication number: CN218385101U
Application number: CN202221861550.9U
Authority: CN
Inventors: 庄逸尘
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2023-01-24
Anticipated expiration: 2032-07-19

Abstract

The utility model adopts the technical proposal that: a DC fast protection device containing weight-increasing grid pieces comprises: the device comprises a gas generating device, a breaking grid piece, an insulating shell, a breaking copper bar, an electric arc channel and an arc extinguish chamber; the gas generating device, the breaking grid sheet, the breaking copper bar, the arc channel and the arc extinguish chamber are sequentially and coaxially arranged in the insulating shell; the gas generating device is used for receiving an external trigger signal, generating energy after being triggered, pushing the cut-off grid plate to move towards the cut-off copper bar and cutting off the cut-off copper bar; the electric arc generated by cutting off the cut-off copper bar by the cut-off grid sheet is extruded to enter the electric arc channel; the electric arc enters the arc extinguishing chamber through the electric arc channel; arc extinguishing materials are placed in the arc extinguishing chamber; and the weight increasing block is arranged in the cut-off grid sheet. The utility model discloses effectively reduce the velocity of motion of breaking grid piece.

Description

Direct current rapid protection device containing weight increasing grid piece

Technical Field

The utility model belongs to the technical field of circuit protection, concretely relates to quick protection device of direct current that contains weight gain bars piece.

Background

The fuse is an electric appliance which uses a metal conductor as a melt to be connected in series in a circuit, and is fused due to self heating when overload or short-circuit current passes through the melt, so that the circuit is broken. The fuse has the advantages of simple structure, convenient use, safety protection in a power distribution system, wide application in power grid protection and electric equipment protection, automatic circuit cutting when short circuit fault or overload occurs to the power grid or the electric equipment, avoidance of electric equipment damage and prevention of accident spreading.

Various novel fuses begin to appear at present, and the most widely applied fuse is an initiating explosive device breaker. The working principle is as follows:

when the current is normally passed, the current can flow through the through-current copper bar. When short circuit occurs, the initiating explosive device receives an ignition signal and is ignited, the high temperature and high pressure generated when the initiating explosive device is ignited push the insulating grid plate to move, and break the through-flow copper bar, so that the through-flow copper bar is divided into two parts and insulated and isolated. In the breaking process, the generated electric arc can enter an arc extinguish chamber containing energy-absorbing substances, so that energy absorption and temperature reduction are realized, and breaking is finally completed.

The copper bar is broken by the insulated grid plate, which is the most critical link in the breaking process. The descending speed of the insulated gate plate obviously affects the disjunction effect of the copper bar, and if the descending speed of the insulated gate plate is too high, the impact is easily caused on the product body, so that the stability of the product is affected. The prior art often reduces the impact force of breaking grid piece to the copper bar through reducing the initiating explosive device impact force, but if the effort undersize of initiating explosive device, leads to the unable normal cutting off of copper bar easily.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the deficiencies that exist of the above-mentioned background art, provide a contain quick protection device of direct current that increases weight grid piece, effectively reduce the rate of motion of breaking grid piece when guaranteeing that the copper bar can break.

The utility model adopts the technical proposal that: a DC fast protection device containing weight-increasing grid pieces comprises: the device comprises a gas generating device, a breaking grid piece, an insulating shell, a breaking copper bar, an electric arc channel and an arc extinguish chamber; the gas generating device, the breaking grid piece, the breaking copper bar, the arc channel and the arc extinguish chamber are sequentially and coaxially arranged inside the insulating shell; the gas generating device is used for receiving an external trigger signal, generating energy after being triggered, pushing the breaking grid plate to move towards the breaking copper bar and cutting the breaking copper bar; the breaking grid plate cuts off an electric arc generated by the breaking copper bar and extrudes the electric arc to enter the electric arc channel; the electric arc enters the arc extinguishing chamber through the electric arc channel; arc extinguishing materials are placed in the arc extinguishing chamber; and the weight increasing block is arranged in the cut-off grid sheet.

In the above technical solution, the breaking grid piece includes a body and a blade; the end surface of the cut-off grid piece close to the gas generating device is provided with a mounting groove matched with the end part of the energy output by the gas generating device; the mounting groove and the weight increasing block are arranged on the body of the cut-off grid piece; the blade extends from the body of the breaking grid plate to the breaking copper bar; before the gas generating device is triggered, the end part of the gas generating device for outputting energy is arranged in the mounting groove; the weight increasing block is positioned between the mounting groove and the blade of the grid-breaking sheet.

In the above technical scheme, before the gas generating device is triggered, the end part of the gas generating device for outputting energy is attached to the bottom surface of the mounting groove.

In the technical scheme, before the gas generating device is triggered, the end face of the cut-off grid piece close to the gas generating device is attached to the inner wall of the insulating shell.

In the technical scheme, the weight increasing block is made of stainless steel.

In the technical scheme, the weight increasing block is of a cylindrical structure and is coaxially arranged with the body of the breaking grid piece.

In the technical scheme, the center of the weight increasing block is superposed with the center of the body of the cut-off grid sheet; the diameter of the weight increasing block is at least 4mm smaller than that of the breaking grid sheet; the end face of the weight-increasing block is at least 3mm away from the end face of the body of the breaking grid piece.

In the technical scheme, the weight of the weight increasing block is equal to the weight of the breaking grid piece.

In the technical scheme, the weight increasing block and the body of the cut-off grid piece are integrally formed, and the weight increasing block is provided with the through hole.

In the above technical solution, the body of the break-gate sheet includes an upper part and a lower part; the bottom surfaces of the upper part and the lower part and the top surface of the upper part are mutually matched to form a mounting hole; the weight increasing block is arranged in the mounting hole; the upper part and the lower part are fixedly connected through viscose; the weight increasing block is fixedly connected with the mounting hole through adhesive.

The utility model has the advantages that: the utility model discloses an at the inside embedded weight that increases that is equipped with of disconnected grating piece for weight gain under the unchangeable condition of disconnected grating piece keeps original volume, because the thrust that gas generating device produced is unanimous basically, the quality of disconnected grating piece is heavier, and its acceleration that produces under the same thrust is less, and whole functioning speed is slow more, thereby can avoid disconnected grating piece because of the too fast striking that produces of speed, leads to disconnected grating piece to break and damages. Meanwhile, the process of cutting the copper bar by the breaking grid plate is at the initial stage of the movement of the breaking grid plate, the speed of the breaking grid plate is increased from zero, and the speed is low, so that the weight of the breaking grid plate is changed, the process of cutting the copper bar and the subsequent arcing process of the copper bar are not greatly influenced, and the overall effectiveness of the product effect is effectively ensured. The weight increasing block is embedded in the cut-off grid plate, so that the weight of the cut-off grid plate is increased under the condition that the original volume is not changed, the descending speed is reduced under the same impact force, and the cut-off grid plate is prevented from being broken due to impact generated by too high speed; meanwhile, the weight is increased, so that the structural strength of the breaking grid piece can be enhanced, and the risk of breakage is reduced. The material of the weight-increasing block can be selected from 304 stainless steel, and sufficient strength and weight are provided. The weight increasing block is concentric with the excircle of the cut-off grid sheet, the diameter of the weight increasing block is at least 4mm smaller than that of the cut-off grid sheet, the weight increasing block is guaranteed not to be exposed after being wrapped by plastic, circuit faults are avoided, and the plastic on the periphery of the cut-off grid sheet has enough strength and cannot be damaged when moving. The weight-increasing block is located in the middle of the solid part at the top of the grid-breaking sheet, and needs to be kept away from the lower surface of the solid part of the grid-breaking sheet by a distance of more than 3mm, so that the root of the blade at the lower part of the grid-breaking sheet has enough strength and does not break during movement and impact.

Drawings

FIG. 1 is a schematic structural view of embodiment 1;

fig. 2 is a schematic structural diagram of embodiment 2.

The gas generating device comprises a gas generating device 1, a weight increasing block 2, an insulating shell 3, a copper bar 4-cut-off, an arc channel 5, an arc extinguish chamber 6, a weak groove 7, a blade 8, a mounting hole 9, a grid 10-cut-off and a mounting groove 11.

Detailed Description

The invention will be further described in detail with reference to the drawings and the following detailed description, which are provided for the purpose of clearly understanding the invention and are not intended to limit the invention.

As shown in fig. 1, an embodiment 1 provides a dc fast protection device including a weight gain grid, including: the device comprises a gas generating device 1, a breaking grid sheet 10, an insulating shell 3, a breaking copper bar 4, an arc channel 5 and an arc extinguish chamber 6; the gas generating device 1, the breaking grid piece 10, the breaking copper bar 4, the arc channel 5 and the arc extinguish chamber 6 are coaxially arranged inside the insulating shell 3 from top to bottom in sequence; the gas generating device 1 is fixed on the insulating shell 3 and used for receiving an external trigger signal, generating energy after being triggered, pushing the breaking grid plate 10 to move towards the breaking copper bar 4 and cutting off the breaking copper bar 4; the breaking grid piece 10 cuts off electric arcs generated by the breaking copper bar 4 and extrudes the electric arcs into the electric arc channel 5; the arc enters the arc chute 6 via the arc channel 5; arc extinguishing materials are placed in the arc extinguishing chamber 6; the end surface of the break-off grid sheet 10 close to the gas generating device 1 is provided with a mounting groove 11 matched with the end part of the energy output by the gas generating device 1; before the gas generating device 1 is triggered, the end part of the gas generating device 1 for outputting energy is arranged in the mounting groove 11; the weight increasing block 2 is arranged inside the cut-off grid sheet 10.

Specifically, the breaking grid piece 10 comprises a breaking grid piece 10 body and a blade 8; the mounting groove 11 and the weight increasing block 2 are arranged on the body of the cut-off grid piece 10; the blade 8 extends from the body of the cut-off grid piece 10 to the cut-off copper bar 4; the weighting block 2 is positioned between the mounting groove 11 and the blade 8 of the breaking grid 10. Before the gas generating device 1 is triggered, the end part of the gas generating device 1 outputting energy is attached to the bottom surface of the mounting groove 11.

When the circuit applied to the direct current quick protection device with the weight increasing grid sheet normally passes through, the gas generating device 1 is not triggered. At the moment, the mounting groove 11 at the top of the break-off grid piece 10 is tightly attached to the gas generating device 1, the end face, close to the gas generating device 1, of the break-off grid piece 10 is attached to the inner wall of the insulating shell 3, the tip of the bottom of the blade 8 of the break-off grid piece 10 is in contact with the break-off copper bar 4, after the gas generating device 1 is triggered, the energy generated by gas generation can push the break-off grid piece 10 to move downwards, and the blade 8 can cut off the break-off copper bar 4 and enter the arc channel 5. The energy source of the gas generating device can be initiating explosive devices.

The upper surface and the lower surface of the break copper bar 4 are provided with weak grooves 7 which correspond to the tips of blades 8 of the break grid pieces 10 and are easy to cut off the break grid pieces 10. And a step-shaped avoidance groove is formed in the upper part of the arc channel. When the break grid piece moves downwards, the weak groove can enable the break copper bar to generate the maximum stress concentration effect at the position opposite to the blade, the break copper bar can be effectively cut off, and the port of the break copper bar is bent downwards for 90 degrees to enter the corresponding avoiding groove.

The blade 8 of the break-open grid piece 10 generates electric arcs after cutting off the corresponding weak slot 7 of the copper bar, the electric arcs can enter the electric arc channel 5 to be elongated, electric arc voltage higher than system voltage is formed, and then current on the break-open copper bar 4 is reduced.

Meanwhile, the arc energy enters an arc extinguish chamber 6 below the arc channel 5, and energy absorbing substances are placed in the arc extinguish chamber 6. The electric arc is cooled by the energy absorption substance, and the whole breaking process is completed after energy absorption.

The weight increasing block 2 is embedded in the cut-off grid piece 10, and the weight of the cut-off grid piece 10 can be controlled by adjusting the weight of the weight increasing block 2 so as to control the running speed of the cut-off grid piece and avoid the cut-off grid piece from being broken due to impact caused by over high speed. The weighting block 2 can enhance the structural strength of the grid and reduce the risk of cracking.

Specifically, the weight increasing body 2 is made of 304 stainless steel, and sufficient strength and weight are provided. The weighting block 2 is of a cylindrical structure and is arranged coaxially with the body of the breaking grid piece 10. The center of the weight increasing block 2 is coincident with the center of the body of the break-off grid piece 10, so that the balance of the break-off grid piece 10 in the motion process is ensured.

The diameter of the weight increasing block 2 is at least 4mm smaller than that of the breaking grid sheet 10. Because the material of the break-off grid piece 10 is plastic, the size proportion of the weight increasing block 2 and the break-off grid piece 10 is reasonably configured, the weight increasing block 2 is ensured not to be exposed by being wrapped by the plastic, and the plastic on the periphery has enough strength and cannot be damaged when in movement.

The end face of the weight increasing block 2 is at least 3mm away from the end face of the body of the breaking grid piece 10. Because the weight increasing block 2 is positioned in the middle of the grid-breaking sheet 10 body, the distance of the weight increasing block from the lower surface of the grid-breaking sheet 10 body is required to be ensured to be more than 3mm, and the root of the blade 8 of the grid-breaking sheet 10 is ensured to have enough strength and not to break during movement and impact.

In the above technical solution, the weight of the weighting block 2 is equal to the weight of the grid-breaking sheet 10. The weight of the weight increasing block 2 is generally designed according to the product requirements, and generally, the weight of the weight increasing block 2 will account for 50% of the weight of the whole grid-breaking piece 10, namely the weight of the weight increasing block 2: weight of grid sheet plastic =1:1.

the weight increasing block 2 and the body of the breaking grid piece 10 are integrally formed, and a through hole is formed in the weight increasing block 2. The material of the break-off grid sheet 10 is engineering plastics, and the weight increasing block 2 is put into the integral forming during the forming. In this case, the weight increasing body 2 needs to be provided with a through hole so as to be better combined with the surrounding plastic.

As shown in fig. 2, an embodiment 2 provides a dc fast protection device with a weight-increasing grid, the structure of the embodiment 2 is substantially the same as that of the embodiment 1, and only the matching manner of the weight-increasing block 2 and the grid-breaking sheet 10 is different: the body of the break-off grid piece 10 comprises an upper part and a lower part; the bottom surfaces of the upper part and the lower part and the top surface of the upper part are matched with each other to form a mounting hole 9; the weight increasing block 2 is arranged in the mounting hole 9; the upper part and the lower part are fixedly connected through viscose; the weight increasing block 2 is fixedly connected with the mounting hole 9 through adhesive.

Those not described in detail in this specification are within the skill of the art.

Claims

1. A direct current rapid protection device containing a weight gain grid piece is characterized by comprising: the device comprises a gas generating device, a breaking grid piece, an insulating shell, a breaking copper bar, an electric arc channel and an arc extinguish chamber; the gas generating device, the breaking grid piece, the breaking copper bar, the arc channel and the arc extinguish chamber are sequentially and coaxially arranged inside the insulating shell; the gas generating device is used for receiving an external trigger signal, generating energy after being triggered, pushing the cut-off grid plate to move towards the cut-off copper bar and cutting off the cut-off copper bar; the breaking grid plate cuts off an electric arc generated by the breaking copper bar and extrudes the electric arc to enter the electric arc channel; the electric arc enters the arc extinguishing chamber through the electric arc channel; arc extinguishing materials are placed in the arc extinguishing chamber; and the weight increasing block is arranged in the cut-off grid sheet.

2. The direct current fast protection device containing the weight gain grid plate of claim 1, wherein: the breaking grid piece comprises a body and a blade; the breaking grid piece comprises a body and a blade; the end surface of the breaking grid piece close to the gas generating device is provided with a mounting groove matched with the end part of the gas generating device for outputting energy; the mounting groove and the weight increasing block are arranged on the body of the cut-off grid piece; the blade extends from the body of the cut-off grid piece to the cut-off copper bar; before the gas generating device is triggered, the end part of the gas generating device for outputting energy is arranged in the mounting groove; the weight increasing block is positioned between the mounting groove and the blade for cutting off the grid sheet.

3. The direct current fast protection device containing the weight gain grid plate of claim 2, wherein: before the gas generating device is triggered, the end part of the output energy of the gas generating device is attached to the bottom surface of the mounting groove.

4. The direct current rapid protection device containing the weight-increasing grid according to claim 1, characterized in that: before the gas generating device is triggered, the end face, close to the gas generating device, of the cut-off grid piece is attached to the inner wall of the insulating shell.

5. The direct current fast protection device containing the weight gain grid plate of claim 2, wherein: the weight increasing block is of a cylindrical structure and is coaxially arranged with the body of the breaking grid piece.

6. The direct current fast protection device containing the weight gain grid plate of claim 5, wherein: the center of the weight increasing block is superposed with the center of the body of the cut-off grid sheet; the diameter of the weight increasing block is at least 4mm smaller than that of the cut-off grid sheet; the end face of the weight-increasing block is at least 3mm away from the end face of the body of the breaking grid piece.

7. The direct current fast protection device containing the weight gain grid plate of claim 2, wherein: the weight of the weight increasing block is equal to the weight of the breaking grid piece.

8. The direct current fast protection device containing the weight gain grid plate of claim 2, wherein: the weight increasing block and the body of the breaking grid sheet are integrally formed, and the weight increasing block is provided with a through hole.

9. The direct current rapid protection device containing the weight-increasing grid according to claim 2, characterized in that: the body of the break-off grid piece comprises an upper part and a lower part; the bottom surfaces of the upper part and the lower part and the top surface of the upper part are mutually matched to form a mounting hole; the weight increasing block is arranged in the mounting hole; the upper part and the lower part are fixedly connected through viscose; the weight increasing block is fixedly connected with the mounting hole through adhesive.