CN214505425U - Double-blade direct-opening fuse with trigger - Google Patents
Double-blade direct-opening fuse with trigger Download PDFInfo
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- CN214505425U CN214505425U CN202120920334.6U CN202120920334U CN214505425U CN 214505425 U CN214505425 U CN 214505425U CN 202120920334 U CN202120920334 U CN 202120920334U CN 214505425 U CN214505425 U CN 214505425U
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Abstract
The utility model provides a trigger-containing double-blade direct-opening fuse, which comprises an insulating shell and a trigger; the insulation shell is provided with a breaking copper bar, a breaking grid sheet and a gas generating device, the surface of the breaking copper bar is provided with two grooves, the lower part of the breaking copper bar is provided with two breaking blades, each breaking blade is vertically opposite to one groove, and the insulation shell is internally provided with a guide groove and an arc extinguish chamber in sequence in the downward extending direction of each groove; the trigger is arranged outside the insulating shell and connected into the on-off copper bar, the trigger is used for detecting current and triggering the gas generating device, the two on-off blades cut off the two grooves and respectively generate electric arcs, the electric arcs enter the guide grooves and are stretched and then connected in series to form electric arc voltage higher than system voltage, and then the current on the on-off copper bar is reduced to zero crossing. The utility model has the advantages that: the breaking capacity is strong, the response speed is high, and the reliability and the safety are improved; the processing difficulty and the assembly difficulty are reduced, and the method also has the advantages of simple process and low cost.
Description
Technical Field
The utility model relates to a circuit protection device technical field especially relates to a contain trigger formula double knives directly to open fuse.
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. Fuses exist in the market at present, and most of fuses need to externally provide short-circuit signals or detect internal circuits and then provide short-circuit signals, so that the breaking reliability is poor, and potential safety hazards are possibly generated; in other electric equipment, the assembly difficulty of the fuse and an external detection component is high.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problem of the short-circuit signal generated by the conventional fuse in the breaking process, an embodiment of the present invention provides a dual-blade direct-opening fuse with a trigger.
The embodiment of the utility model provides a double-blade direct-opening fuse with a trigger, which comprises an insulating shell and a trigger;
the insulation shell is provided with a straight plate-shaped breaking copper bar which penetrates through the insulation shell, a breaking grid piece and a gas generating device, wherein the breaking grid piece and the gas generating device are arranged in the insulation shell, the surface of the breaking copper bar is provided with two grooves which are arranged at intervals, the breaking grid piece is arranged above the breaking copper bar, the gas generating device is connected with the upper part of the breaking grid piece, the lower part of the breaking copper bar is provided with two breaking blades, each breaking blade is vertically opposite to one groove, and a guide groove and an arc extinguish chamber are sequentially arranged in the insulation shell in the downward extending direction of each groove;
the trigger is arranged outside the insulating shell and connected with the cut-off copper bar, the trigger is further connected with the gas generating device, the trigger is used for detecting current flowing through the cut-off copper bar and sending a trigger signal to the gas generating device when the current is overloaded, the gas generating device is started to push the cut-off grid pieces to move downwards, the two cut-off blades cut off the two grooves and respectively generate electric arcs, the electric arcs enter the guide grooves and are elongated and then connected in series to form electric arc voltage higher than system voltage, and then the current on the cut-off copper bar is reduced to zero crossing.
Furthermore, the trigger is a silver sheet type trigger, a breaking groove is formed in the break copper bar, and the trigger is connected into the breaking groove to enable the break copper bar to be conducted.
Furthermore, the upper part of the guide groove is provided with a step-shaped expansion opening, and when the cutting blade cuts the groove, the edge part at the position of the groove fracture is bent and deflected into the expansion opening.
Further, the lower part of the guide groove is provided with a tapered slit for blocking the downward movement of the cutting blade.
Furthermore, arc-shaped transition surfaces are arranged on two sides of the upper portion of the breaking blade, and the edge of the upper portion of the groove abuts against the transition surfaces to limit the downward movement of the breaking grid piece.
Further, the groove is a double-sided groove.
Furthermore, the breaking grid piece comprises a grid piece upper cover, a grid piece metal piece and a breaking cutter, the grid piece upper cover is in an inverted T shape, a restraining groove is formed in the top of the breaking cutter, the two breaking blades are arranged on the lower portion of the breaking cutter, the grid piece metal piece is arranged in the restraining groove, the lower end of the grid piece upper cover abuts against the grid piece metal piece, and the upper end of the grid piece upper cover is connected with the gas generating device.
Furthermore, an insulating sleeve which is vertically arranged is arranged in the insulating shell, and the breaking grid piece is embedded into the insulating sleeve and can slide up and down.
Furthermore, the bottom of the opening blade is provided with a V-shaped sharp edge, and the sharp edge is abutted against the upper surface of the groove.
Furthermore, the two arc extinguishing chambers are relatively independent, and arc extinguishing materials are placed in the two arc extinguishing chambers.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the utility model discloses a contain trigger formula double knives directly open fuse, trigger and fuse main part are integrated into an organic whole, directly provide trigger signal, utilize cross the arc gap and make two groove department elongated and establish ties the electric arc that produces after being cut off, produce the electric arc voltage that is higher than system's voltage, make short-circuit current descend until zero passage, the breaking capacity is strong, response speed is fast, has improved reliability and security; compared with the existing fuse products, the novel fuse has the advantages of reducing processing difficulty and assembly difficulty, along with simple process and low cost.
Drawings
FIG. 1 is a cross-sectional view of a dual blade direct-opening fuse of the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
In the figure: 1-a gland, 2-an upper outer shell, 3-a lower inner shell, 4-a lower outer shell, 5-a breaking copper bar, 6-a gas generating device, 7-a breaking cutter, 8-a breaking blade, 9-a groove, 10-a trigger, 11-a guide groove, 12-an arc extinguish chamber, 13-a grid sheet upper cover, 14-a grid sheet metal sheet, 15-an insulating sleeve, 16-a metal bushing, 17-a breaking groove, 18-a silver sheet, 19-an enlarged opening and 20-a tapered slit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a dual-blade direct-opening fuse including a trigger, including an insulating housing and a trigger 10.
Specifically, referring to fig. 1, the insulating housing is integrally cylindrical and includes, from top to bottom, a gland 1, an upper housing 2, a lower inner housing 3 and a lower outer housing 4, all of which are made of insulating materials. The upper shell 2 and the lower shell 4 are both of cavity structures.
The insulating shell is provided with a straight plate-shaped breaking copper bar 5 which penetrates through the insulating shell, a breaking grid piece and a gas generating device 6 which are arranged in the insulating shell. Specifically, the method comprises the following steps:
the break copper bar 5 is supported on the upper portion of the lower inner shell 3, the upper end of the lower inner shell 3 is fixedly connected with the upper outer shell 2, the upper outer shell 2 and the lower inner shell 3 clamp and fix the break copper bar 5, and two ends of the break copper bar 5 extend out of the insulating outer shell to be connected with a protected main circuit.
The surface of the inner part of the insulating shell of the break copper bar 5 is provided with two grooves 9 which are arranged at intervals, and the two grooves 9 are arranged in the middle of the insulating shell and are arranged in parallel relatively. The break copper bar 5 is integrally processed and formed, and has small integral resistance and strong circulation capacity.
The groove 9 is arranged on the upper surface of the break copper bar 5 and along the strip-shaped groove in the width direction of the break copper bar 5. The groove 9 should have a certain depth to ensure that the groove 9 can be easily cut.
The groove 9 can be a double-sided groove, namely the groove is also formed in the lower surface of the break copper bar 5, the groove is formed in the back of the groove 9 in the upper surface of the break copper bar 5, the groove 9 is formed in the same position of the upper surface and the lower surface of the break copper bar, and the break copper bar is located in the groove 9 to form an obvious weak narrow-diameter position and is easy to cut. Here, a plurality of stress grooves can be simultaneously cut on the upper and lower surfaces of the broken copper bar 5 by a laser cutting technology, so that two grooves 9 are simultaneously formed on the same position on the upper and lower surfaces of the broken copper bar 5.
The break grid plate is arranged above the break copper bar 5, and the gas generating device 6 is connected with the upper part of the break grid plate. Here, a cylindrical cavity with an open lower end is arranged inside the upper shell 2, and the lower end of the cavity is covered on the two grooves 9. The break gate sheet is arranged in the cavity, the vertically arranged insulating sleeve 15 is arranged in the cavity, the break gate sheet is embedded in the insulating sleeve 15 and can slide up and down, and the insulating sleeve 15 can effectively improve the overall insulating capacity of the insulating shell.
The breaking grid piece comprises a grid piece upper cover 13, a grid piece metal piece 14 and a breaking cutter 7, the grid piece upper cover 13 is in an inverted T shape, a restraining groove is formed in the top of the breaking cutter 7, the grid piece metal piece 14 is arranged in the restraining groove, and the lower end of the grid piece upper cover 13 abuts against the grid piece metal piece 14. The top of the upper shell 2 is provided with a groove, a metal bushing 16 is arranged in the groove, the gas generating device 6 is arranged in the metal bushing 16, the gland 1 covers the upper end of the upper shell 2 and tightly presses and fixes the gas generating device 6, and the grid upper cover 13 penetrates through the upper end of the cavity and is connected with the gas generating device 6.
The lower part of the breaking copper bar 5 is provided with two breaking blades 8, each breaking blade 8 is opposite to one groove 9 from top to bottom, and the two breaking blades 8 are arranged on the lower part of the breaking cutter 7. The two opening blades 8 are vertically arranged, and a V-shaped sharp edge is arranged at the bottom of each opening blade 8 and is abutted against the upper surface of the groove 9.
Referring to fig. 2, a guide slot 11 and an arc extinguishing chamber 12 are further sequentially disposed in the insulating housing in a downward extending direction of each of the grooves 9. Specifically, the guide groove 11 is disposed in the lower inner housing 3, and the guide groove 11 penetrates through the lower inner housing 3. Furthermore, the upper portion of the guide groove 11 is provided with a step-shaped expansion opening 19, when the cutting blade 8 cuts off the groove 9, the copper bar portion at the cut-off opening of the groove 9 is bent and deflected into the expansion opening 19, so that the expansion opening 19 provides an accommodating space at the edge of the cut-off groove 9, and the cutting blade 8 is prevented from being extruded by the cutting blade 8 to hinder the cutting blade 8 from moving downwards.
Two the explosion chamber 12 all set up in the shell 4 down, each the explosion chamber 12 with one the lower extreme intercommunication of guide way 11. Two the explosion chamber 12 is independent relatively, and two arc extinguishing material has all been placed in the explosion chamber 12, and arc extinguishing material is used for guaranteeing the arc extinguishing effect, can select quartz sand etc..
In addition, in order to limit the downward movement distance of the cutting blade 8, a tapered slit 20 for blocking the downward movement of the cutting blade 8 is provided at the lower part of the guide groove 11, and arc-shaped transition surfaces are provided at both sides of the upper part of the cutting blade 8. The width of the tapered slit 20 is smaller than the thickness of the cutting blade 8, and the width of the tapered slit 20 gradually decreases from top to bottom, so that the tapered slit can block the cutting blade 8 after cutting the groove 9 to limit the downward movement distance of the cutting blade 8, and simultaneously, when the cutting blade 8 moves downward to a set position, the upper edge of the groove 9 abuts against the transition surface to limit the downward movement of the cutting blade 8. Therefore, the blocking effect of the conical slit 20 and the transition surface can prevent the upper part of the breaking grid sheet from directly impacting the upper surface of the copper bar 5 of the breaker when moving downwards, so that the breaking grid sheet is broken, and the electrical insulation performance is poor.
The trigger 10 is arranged outside the insulating shell and connected into the break copper bar 5, and the trigger 10 is further connected with the gas generating device 6 through a conducting wire. The trigger is a silver sheet type trigger, a breaking groove 17 is formed in the break copper bar 5, and a silver sheet 18 of the trigger 10 is connected into the breaking groove 17 to enable the break copper bar 5 to be conducted.
After the two ends of the break copper bar 5 of the trigger type double-pole direct-opening fuse are connected with a main circuit of a power system, the trigger 10 is used for detecting the current flowing through the break copper bar 5, when the current flowing through the break copper bar 5 is overloaded, the silver sheet 17 of the trigger 10 is fused and sends a trigger signal to the gas generating device 6, the gas generating device 6 is started to push the break grid sheet to move downwards, the two break blades 8 cut off the two grooves 9 and respectively generate electric arcs, the electric arcs enter the guide groove 11 to be elongated, the two electric arcs are connected in series to form an electric arc voltage higher than the system voltage, and then the current on the main circuit is forced to rapidly drop until zero crossing, and rapid breaking is completed. Finally, the two arcs enter the two arc extinguishing chambers 12 respectively for arc extinguishing so as to avoid short circuit of the stroke.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The utility model provides a contain trigger formula double knives directly open fuse which characterized in that: comprises an insulating shell and a trigger;
the insulation shell is provided with a straight plate-shaped breaking copper bar which penetrates through the insulation shell, a breaking grid piece and a gas generating device, wherein the breaking grid piece and the gas generating device are arranged in the insulation shell, the surface of the breaking copper bar is provided with two grooves which are arranged at intervals, the breaking grid piece is arranged above the breaking copper bar, the gas generating device is connected with the upper part of the breaking grid piece, the lower part of the breaking copper bar is provided with two breaking blades, each breaking blade is vertically opposite to one groove, and a guide groove and an arc extinguish chamber are sequentially arranged in the insulation shell in the downward extending direction of each groove;
the trigger is arranged outside the insulating shell and connected with the cut-off copper bar, the trigger is further connected with the gas generating device, the trigger is used for detecting current flowing through the cut-off copper bar and sending a trigger signal to the gas generating device when the current is overloaded, the gas generating device is started to push the cut-off grid pieces to move downwards, the two cut-off blades cut off the two grooves and respectively generate electric arcs, the electric arcs enter the guide grooves and are elongated and then connected in series to form electric arc voltage higher than system voltage, and then the current on the cut-off copper bar is reduced to zero crossing.
2. The dual-blade direct-opening fuse of claim 1, wherein: the trigger is a silver sheet type trigger, a breaking groove is formed in the break copper bar, and the trigger is connected into the breaking groove to enable the break copper bar to be conducted.
3. The dual-blade direct-opening fuse of claim 1, wherein: the upper part of the guide groove is provided with a step-shaped expansion opening, and when the groove is cut off by the cut-off blade, the edge part at the cut-off position of the groove is bent and deflected into the expansion opening.
4. The dual-blade direct-opening fuse of claim 1, wherein: the lower part of the guide groove is provided with a conical slit for blocking the downward movement of the cutting blade.
5. The dual-blade direct-opening fuse of claim 4, wherein: the two sides of the upper part of the breaking blade are respectively provided with an arc-shaped transition surface, and the edge of the upper part of the groove is abutted against the transition surfaces to limit the downward movement of the breaking grid plate.
6. The dual-blade direct-opening fuse of claim 1, wherein: the grooves are double-sided grooves.
7. The dual-blade direct-opening fuse of claim 1, wherein: the breaking grid piece comprises a grid piece upper cover, a grid piece metal piece and a breaking cutter, the grid piece upper cover is in an inverted T shape, a restraining groove is formed in the top of the breaking cutter, the two breaking blades are arranged on the lower portion of the breaking cutter, the grid piece metal piece is arranged in the restraining groove, the lower end of the grid piece upper cover abuts against the grid piece metal piece, and the upper end of the grid piece upper cover is connected with the gas generating device.
8. The dual-blade direct-opening fuse of claim 1, wherein: the insulation shell is internally provided with a vertically arranged insulation sleeve, and the breaking grid piece is embedded into the insulation sleeve and can slide up and down.
9. The dual-blade direct-opening fuse of claim 1, wherein: the bottom of the breaking blade is provided with a V-shaped sharp edge, and the sharp edge is abutted to the upper surface of the groove.
10. The dual-blade direct-opening fuse of claim 1, wherein: the two arc extinguishing chambers are relatively independent, and arc extinguishing materials are placed in the two arc extinguishing chambers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120920334.6U CN214505425U (en) | 2021-04-29 | 2021-04-29 | Double-blade direct-opening fuse with trigger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120920334.6U CN214505425U (en) | 2021-04-29 | 2021-04-29 | Double-blade direct-opening fuse with trigger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214505425U true CN214505425U (en) | 2021-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120920334.6U Active CN214505425U (en) | 2021-04-29 | 2021-04-29 | Double-blade direct-opening fuse with trigger |
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| Country | Link |
|---|---|
| CN (1) | CN214505425U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115036160A (en) * | 2022-08-10 | 2022-09-09 | 杭州超熔科技有限公司 | Instantaneous breaker and composite arc extinguishing method thereof |
-
2021
- 2021-04-29 CN CN202120920334.6U patent/CN214505425U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115036160A (en) * | 2022-08-10 | 2022-09-09 | 杭州超熔科技有限公司 | Instantaneous breaker and composite arc extinguishing method thereof |
| CN115036160B (en) * | 2022-08-10 | 2022-11-11 | 杭州超熔科技有限公司 | Instantaneous breaker and composite arc extinguishing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yan Ling Inventor after: Zhuang Yichen Inventor before: Zhuang Yichen Inventor before: Zhang Li Inventor before: Yan Ling Inventor before: Li Siguang Inventor before: Tang Youdong |
|
| CB03 | Change of inventor or designer information |