CN214624955U - Single-blade straight-plate fuse hybrid fuse - Google Patents
Single-blade straight-plate fuse hybrid fuse Download PDFInfo
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- CN214624955U CN214624955U CN202120876084.0U CN202120876084U CN214624955U CN 214624955 U CN214624955 U CN 214624955U CN 202120876084 U CN202120876084 U CN 202120876084U CN 214624955 U CN214624955 U CN 214624955U
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Abstract
The utility model provides a single-blade straight-plate fuse hybrid fuse, which comprises an insulating shell, a breaking copper bar, a breaking grid plate, a gas generating device and a fuse wire; the improved fuse wire breaker is characterized in that a groove is formed in the breaking copper bar, breaking blades are arranged on the lower portion of the breaking grid piece and located above the groove, an arc extinguish chamber is arranged at the bottom of the insulating shell, a fuse wire is arranged in the arc extinguish chamber, the two ends of the fuse wire are connected with the two ends of the breaking copper bar through wires respectively, the gas generating device pushes the breaking grid piece to move downwards when in short circuit or overload, the breaking blades cut off the groove, current is transferred to the fuse wire, the fuse wire is fused and arcing forms overvoltage higher than system voltage, and the current on the breaking copper bar is reduced until zero crossing. The utility model has the advantages that: the breaking capacity is strong, the response speed is high, the breaking device has the advantages of simple structure, convenience in use and low cost, and meets the requirement of the civil market on large-energy breaking.
Description
Technical Field
The utility model relates to a circuit protection device technical field especially relates to a single-blade straight plate type fuse mixed type 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 and convenient use, is an electric appliance with safety protection function in a low-voltage civil power distribution system, is widely applied to power grid protection and electric equipment protection, and can automatically cut off a circuit when a short-circuit fault or overload occurs to a power grid or electric equipment, thereby avoiding the damage of the electric equipment and preventing the spread of accidents.
The civil market has increasingly strong demand for large energy breaking, the traditional fuse fuses can meet the protection characteristics, but the temperature rise and the volume cannot meet the demand of customers, the breaking capacity is limited, and a large energy circuit cannot be broken. Some hybrid fuses also exist in the current market, but the hybrid fuses are too complicated in process and too high in cost, and are not beneficial to large-scale popularization and application, so that the hybrid fuses which can meet the market demand and are low in cost and simple in process are needed.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problem that the breaking capacity of the existing fuse is limited in the civil market, an embodiment of the present invention provides a single-blade straight-plate type fuse hybrid fuse.
The embodiment of the utility model provides a single-blade straight plate type fuse mixed type fuse, which comprises an insulating shell with a hollow structure, a breaking copper bar fixed in the insulating shell, a breaking grid sheet arranged above the breaking copper bar, a gas generating device connected with the breaking grid sheet and a fuse wire;
the improved fuse wire breaker is characterized in that a groove is formed in the breaking copper bar, breaking blades are arranged on the lower portion of the breaking grid piece and located above the groove, an arc extinguish chamber is arranged at the bottom of the insulating shell, a fuse wire is arranged in the arc extinguish chamber, the two ends of the fuse wire are connected with the two ends of the breaking copper bar through wires respectively, the gas generating device pushes the breaking grid piece to move downwards when in short circuit or overload, the breaking blades cut off the groove, current is transferred to the fuse wire, and the fuse wire is started to form overvoltage higher than system voltage, so that the current on the breaking copper bar is reduced until zero crossing.
Furthermore, a guide groove is arranged below the groove, a step-shaped expansion opening is formed in the upper portion of the guide groove, and when the cutting blade cuts off the groove, the edge portion of the groove at the opening of the groove is bent to be deviated 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, an avoiding groove is further formed below the guide groove.
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, a plurality of empty grooves are formed in the fuse wire.
Furthermore, the conducting wires are conducting strips which are respectively fixed on opposite side walls of the insulating shell, the upper end of each conducting strip is connected with one end of the breaking copper bar, and the other end of each conducting strip is connected with the fuse wire.
Further, quartz sand is paved at the bottom of the fuse wire.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the utility model discloses a single-blade straight plate type fuse mixed type fuse, when circuit short circuit or overload, when breaking the bars piece and cutting off the copper bar of breaking, the electric current in the circuit passes through the wire and shifts to the fuse on, forms the overvoltage that is higher than system voltage through the fuse arcing, makes the electric current on the copper bar of breaking returns to zero, and the breaking capacity is strong, and response speed is fast, still has simple structure, convenient to use, low cost's advantage, satisfies the disconnected demand of civilian market to the big energy.
Drawings
Fig. 1 is a cross-sectional view of a hybrid fuse of the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
In the figure: 1-breaking copper bar, 2-breaking grid sheet, 3-gas generating device, 4-fuse wire, 5-upper shell, 6-lower shell, 7-groove, 8-guide groove, 9-lead, 10-breaking blade, 11-piston, 12-gland, 13-supporting block, 14-threaded hole, 15-avoidance groove, 16-sharp edge, 17-enlarged opening and 18-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 single-blade straight-plate fuse hybrid fuse, which includes an insulating housing with a hollow structure, a breaking copper bar 1 fixed inside the insulating housing, a breaking grid plate 2 disposed above the breaking copper bar 1, a gas generating device 3 connected to the breaking grid plate 2, and a fuse 4.
Specifically, the insulating casing is a rectangular hollow casing and is composed of an upper casing 5 and a lower casing 6, the upper casing 5 and the lower casing 6 are both of a cavity structure, and the upper casing 5 and the lower casing 6 are buckled up and down and fixedly connected.
The on-off copper bar 1 is in a straight plate shape, and has small overall resistance and strong circulation capacity. The break copper bar 1 is supported at the upper port of the lower shell 6, and the upper shell 5 compresses the break copper bar 1. In addition, a plurality of threaded holes 14 are further formed in the broken copper bar 1, supporting blocks 13 for supporting the broken copper bar 1 are arranged below the threaded holes 14, fastening screws are arranged at the threaded holes 14, and the supporting blocks 13 are connected through the fastening screws, so that the broken copper bar 1 is stably fixed. Two ends of the general break copper bar 1 extend out of the insulation shell to be connected with a protected main circuit.
Be equipped with slot 7 on the copper bar 1 of breaking, slot 7 set up in the middle part of copper bar 1 of breaking, slot 7 specifically is along 1 width direction's of copper bar strip groove breaks, slot 7 by the upper surface undercut of copper bar 1 breaks. Preferably, the on-off copper bar 1 is integrally formed, wherein the groove 7 is a stress groove formed in the surface of the on-off copper bar 1 by processing a certain depth by using a numerical control processing technology, so that the groove 7 is more easily cut off.
The breaking grid piece 2 is arranged right above the breaking copper bar 1, the breaking grid piece 2 is contained in an inner cavity of the upper shell 5, the breaking grid piece 2 is approximately T-shaped and consists of an upper cylindrical body and a lower flaky breaking blade 10, and the upper portion of the breaking grid piece 2 is constrained in the cylindrical inner cavity and can only move in the vertical direction.
The breaking blade 10 is located above the groove 7, the breaking blade 10 being aligned in the vertical direction with the groove 7. Here, the bottom of the opening blade 10 is provided with a V-shaped sharp edge 16, and the opening blade 10 is directly inserted into the groove 7, so that the sharp edge 16 is abutted against the upper surface of the groove 7, thereby on one hand, the opening blade 10 can be accurately aligned with the groove 7, on the other hand, the movement distance of the opening grid 10 is reduced, and the groove 7 can be cut off more quickly.
In addition, referring to fig. 2, a guide groove 8 is arranged below the groove 7, a step-shaped enlarged opening 17 is arranged at the upper part of the guide groove 8, and when the cutting blade 10 cuts off the groove 7, the copper bar part at the cut-off part of the groove 7 is bent and deflected into the enlarged opening 17, so that the enlarged opening 17 provides an accommodating space at the edge of the cut-off groove 7, and the cutting blade 10 is prevented from being extruded to hinder the cutting blade 10 from moving downwards.
Further, a tapered slit 18 for blocking the downward movement of the breaker blade 10 is arranged at the lower part of the guide groove 8, the width of the tapered slit 18 is smaller than the thickness of the breaker blade 10, and the width of the tapered slit 18 is gradually reduced from top to bottom, so that the tapered slit can block the breaker blade 10 after the groove 7 is cut, the downward movement distance of the breaker blade 10 is limited, and the upper part of the breaker bar 2 directly impacts the upper surface of the breaker copper bar 1 when moving downward, so that the breaker bar 2 is broken, and the electrical insulation performance is poor.
Preferably, an avoiding groove 15 is further arranged below the guide groove 5, the avoiding groove 15 is arranged in the extending direction of the tapered slit 18, and the gas generating device 3 is prevented from providing too high gas pressure to cause the breaking blade 10 to rush out of the tapered slit 18.
The gas generating device 3 is arranged at the top of the inner cavity of the upper shell 5, the top of the upper shell 5 is provided with a gland 12, the lower end of the gas generating device 3 is connected with the break-off grid piece 2 through a piston 11, the lower end of the piston 11 is abutted against the upper part of the break-off grid piece 2, and the upper end of the piston is connected with the lower end of the gas generating device 3. The upper part of the gas generating device 3 is pressed and fixed by the gland 12. The lower end of the gas generating device 3 is an output end of the gas generating device, and the triggered gas generating device 3 can push the piston 11 to move downwards so as to push the grid-breaking piece 2 to move downwards.
A metal inner sleeve is arranged on the periphery of the joint of the gas generating device 3 and the piston 11, the gas generating device 3 is detonated to generate a large amount of gas, and the pressure in the chamber is rapidly increased in a very short time after the detonation, so that the metal inner sleeve is used for surrounding the gas generating device 3, and the structural strength of the upper shell 5 is enhanced.
Generally, the gas generator 3 is connected to an external connector, which receives a trigger signal from an external system and triggers the gas generator 3 when receiving the external trigger signal.
The bottom of insulating housing is equipped with the explosion chamber, fuse 4 set up in the explosion chamber, 4 both ends of fuse are connected through wire 9 respectively 1 both ends of copper bar break. Specifically, the fuse 4 is block-shaped or plate-shaped, and is disposed at the bottom of the lower housing 6, a plurality of empty slots may be formed in the fuse 4, a plurality of empty slots may be disposed along the length direction of the fuse 4, and a plurality of empty slots are disposed in each row, and the cross-sectional area of the fuse at the empty slot is reduced, so that the resistance is increased, more heat is accumulated, and the breaking time is reduced.
The conducting wires 9 are conducting strips which are respectively fixed on the opposite side walls of the insulating shell, the upper end of each conducting strip 9 is connected with one end of the breaking copper bar 1, and the other end of each conducting strip is connected with the fuse 4. Meanwhile, quartz sand is paved at the bottom of the fuse wire 4, and the quartz sand plays a role in arc extinguishing of the fuse wire 4.
When the single-blade straight-plate fuse hybrid fuse works normally, as the circulation capacity of the cut-off copper bar 1 is far higher than that of the fuse wire 4, current mainly flows through the cut-off copper bar 1, and the fuse wire 4 basically has no current.
When the overload or short circuit working condition appears, gas generating device 3 receives outside trigger signal after, but the acting produces power, promotes disconnected bars piece 2 high-speed downward motion then, disconnected blade 10 bottom can cut off slot 7 on the disconnected copper bar 1, slot 7 department forms the fracture, establishes the arc voltage, forces the electric current to commutate to on the fuse 4. When the current is switched to the fuse wire 4, the fuse wire 4 starts to arc after being fused, and overvoltage higher than system voltage is formed, so that the current on the on-off copper bar 1 is reduced until zero crossing. Meanwhile, arc extinction is carried out on the quartz sand in the arc extinction chamber, so that the current of the circuit is completely broken.
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 (8)
1. A single-blade straight-plate fuse hybrid fuse, characterized in that: the insulation device comprises an insulation shell with a hollow structure, a breaking copper bar fixed in the insulation shell, a breaking grid piece arranged above the breaking copper bar, a gas generating device connected with the breaking grid piece and a fuse wire;
the improved fuse wire breaker is characterized in that a groove is formed in the breaking copper bar, breaking blades are arranged on the lower portion of the breaking grid piece and located above the groove, an arc extinguish chamber is arranged at the bottom of the insulating shell, a fuse wire is arranged in the arc extinguish chamber, the two ends of the fuse wire are connected with the two ends of the breaking copper bar through wires respectively, the gas generating device pushes the breaking grid piece to move downwards when in short circuit or overload, the breaking blades cut off the groove, current is transferred to the fuse wire, the fuse wire is fused and arcing forms overvoltage higher than system voltage, and the current on the breaking copper bar is reduced until zero crossing.
2. The hybrid single blade straight type fuse as recited in claim 1, wherein: the cutting blade is characterized in that a guide groove is arranged below the groove, a step-shaped expansion opening is formed in the upper portion of the guide groove, and when the cutting blade cuts off the groove, the edge portion of the groove at the opening is bent to be deviated into the expansion opening.
3. A single-blade straight-plate type fuse hybrid fuse as claimed in claim 2, wherein: the lower part of the guide groove is provided with a conical slit for blocking the downward movement of the cutting blade.
4. A single-blade straight-plate type fuse hybrid fuse as claimed in claim 2, wherein: an avoiding groove is further formed below the guide groove.
5. The hybrid single blade straight type fuse as recited in 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.
6. The hybrid single blade straight type fuse as recited in claim 1, wherein: the fuse wire is provided with a plurality of empty grooves.
7. The hybrid single blade straight type fuse as recited in claim 1, wherein: the conducting wires are conducting strips which are respectively fixed on opposite side walls of the insulating shell, the upper end of each conducting strip is connected with one end of the on-off copper bar, and the other end of each conducting strip is connected with the fuse.
8. The hybrid single blade straight type fuse as recited in claim 1, wherein: and quartz sand is paved at the bottom of the fuse wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120876084.0U CN214624955U (en) | 2021-04-26 | 2021-04-26 | Single-blade straight-plate fuse hybrid fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120876084.0U CN214624955U (en) | 2021-04-26 | 2021-04-26 | Single-blade straight-plate fuse hybrid fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214624955U true CN214624955U (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120876084.0U Active CN214624955U (en) | 2021-04-26 | 2021-04-26 | Single-blade straight-plate fuse hybrid fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214624955U (en) |
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2021
- 2021-04-26 CN CN202120876084.0U patent/CN214624955U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| 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 |