CN112382520A

CN112382520A - Instantaneous breaker

Info

Publication number: CN112382520A
Application number: CN202011137311.4A
Authority: CN
Inventors: 戴超
Original assignee: Hunan Gelun Super Melting Technology Co ltd
Current assignee: Hunan Gelun Super Melting Technology Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-02-19

Abstract

The invention discloses an instantaneous breaker, which comprises a lower shell, wherein an arc extinguishing narrow slit is formed in the upper edge of the lower shell along a first direction; the metal fuse wire is arranged in the lower shell and penetrates through the arc extinguishing narrow slit along the second direction, the metal fuse wire is bent into a set shape, opening parts are formed at two ends of the metal fuse wire, and the opening parts correspond to the arc extinguishing narrow slit; the conductive part is arranged on the lower shell, and the middle part of the conductive part is provided with an easy-breaking metal sheet which corresponds to the arc extinguishing narrow slit; the upper shell is covered on the conductive part in a buckling manner and connected with the lower shell, the upper shell is sequentially provided with a gas generating device and a piston firing pin from top to bottom, the piston firing pin corresponds to the breakable metal sheet, and the gas generating device can push the piston firing pin to cut off the breakable metal sheet and insert the breakable metal sheet into the arc extinguishing narrow slit and cut off the metal fuse; the bottom cover is arranged at one end of the lower shell far away from the upper shell to form a pressure relief cavity, and the pressure relief cavity is communicated with the arc extinguishing narrow slit. The instant breaker is matched with the metal fuse wire through the narrow slit to perform arc extinction, and the overall arc extinction effect is improved.

Description

Instantaneous breaker

Technical Field

The invention relates to the field of power control and electric automobiles, in particular to an instant breaker for arc extinction by utilizing a narrow slit and a metal fuse wire.

Background

When an internal cable of the electric automobile is short-circuited or a car collision accident occurs, the circuit needs to be cut off rapidly to avoid the battery pack from being on fire and people from getting an electric shock; when a certain branch of a data center power supply is short-circuited, the branch needs to be cut within ms-level time to avoid the breakdown of the whole network; in the occasion of realizing electric energy conversion by adopting the power electronic device, the damage of the power electronic device can be avoided to the greatest extent by adopting the instantaneous breaker.

The instantaneous breaker is divided into two parts in terms of working principle: firstly, a main conductor is knocked off by adopting a gas generating device, and an electric arc can be generated after the main conductor is disconnected; secondly, trying to extinguish the arc on the main conductor. In the products and solutions already existing on the market today, the principle of the first part is basically the same, the main difference being in the second part.

In a common breaker, a mode of connecting an arc extinguishing melt in parallel on a main conductor is mostly adopted, and when the main conductor is broken by collision, current is transferred to the arc extinguishing melt, so that the arc extinguishing melt is fused, and arc extinguishing is realized by the arc extinguishing melt. However, this approach has disadvantages in that: (1) the arc-extinguishing melt is always connected in parallel on the main conductor, and can share part of current during normal work, possibly leading to premature aging failure of the arc-extinguishing melt; (2) when the circuit is cut off under the condition that the current of the circuit is zero or very small, the arc extinguishing melt cannot be fused to keep electrical connection, and the potential safety hazard of personnel electric shock exists.

Disclosure of Invention

The invention provides an instantaneous breaker to improve the arc extinguishing effect of the instantaneous breaker.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

the technical scheme of the invention provides an instant breaker, which comprises:

the lower shell is provided with an arc extinguishing narrow slit along a first direction;

the metal fuse wire is arranged in the lower shell and penetrates through the arc extinguishing narrow slit along a second direction, the metal fuse wire is bent into a set shape, so that opening parts are formed at two ends of the metal fuse wire, the opening parts correspond to the arc extinguishing narrow slit, and the second direction is perpendicular to the first direction;

the conductive part is arranged on the lower shell, the middle part of the conductive part is provided with a breakable metal sheet, and the breakable metal sheet corresponds to the arc extinguishing narrow slit;

the upper shell is buckled on the conductive part and detachably connected with the lower shell so as to be matched with the lower shell to clamp the conductive part together, a piston channel is formed in the upper shell along the first direction, a gas generating device and a piston firing pin are sequentially arranged in the piston channel from top to bottom, the piston firing pin corresponds to the breakable metal sheet, and the gas generating device can be electrically connected with an external detection circuit and is used for receiving signals and generating high-pressure gas so as to push the piston firing pin to cut off the breakable metal sheet and insert the breakable metal sheet into the arc extinguishing narrow slit and cut off a metal fuse wire positioned in the arc extinguishing narrow slit;

the bottom cover is arranged at one end, far away from the upper shell, of the lower shell to match with the lower shell to jointly form a pressure relief cavity, and the pressure relief cavity is communicated with the arc extinguishing narrow gap.

Preferably, the piston firing pin comprises a piston head and a firing pin; the piston head is in contact with the gas generating device, the striker is arranged on the piston head at one side far away from the gas generating device, a guide groove is formed in the inner wall of the piston channel along the first direction, and the side wall of the striker is positioned in the guide groove, so that the piston head can push the striker to move along the guide groove.

Preferably, the striker includes a cutting portion provided on a side of the piston head remote from the gas generator, and flange portions provided on both sides of the cutting portion so that the cutting portion and the flange portions form an "i" shape together;

the arc extinguishing narrow slit is provided with an arc extinguishing channel and flange channels, the flange channels are arranged on two sides of the arc extinguishing channel, so that the arc extinguishing narrow slit forms an I-shaped shape, and the gas generating device can push the piston head to move along the piston channel so as to drive the cutting part to cut off the breakable metal sheet and insert the breakable metal sheet into the arc extinguishing channel and drive the flange part to insert into the flange channels.

Preferably, an annular groove is formed in the piston head, and a sealing ring is arranged in the annular groove and used for sealing a gap between the outer wall of the piston head and the inner wall of the piston channel.

Preferably, two guide plates which are parallel to each other are arranged in the bottom cover, the two guide plates are arranged along the first direction, so that a guide channel is formed between the two guide plates, the top of the guide channel is communicated with the arc extinguishing narrow slit, and two sides of the guide channel are communicated with the pressure relief cavity.

Preferably, a baffle is arranged at the bottom of the arc extinguishing narrow slit, a plurality of flow guide holes are formed in the baffle, and the flow guide holes are communicated with the flow guide channel.

Preferably, the portable electronic device further comprises a top cover, wherein the top cover covers the upper shell and is detachably connected with the upper shell.

Preferably, the upper housing, the lower housing and the piston plunger are made of an insulating material.

Preferably, a plurality of through holes are formed in the breakable metal sheet.

Preferably, the conductive part comprises a first conductive terminal and a second conductive terminal, the first end of the breakable metal sheet is welded and fixed with the first conductive terminal, and the second end of the breakable metal sheet is welded and fixed with the second conductive terminal.

Compared with the prior art, the invention has the following beneficial effects:

according to the instant breaker provided by the technical scheme, when the instant breaker works normally, current passes through the conductive part, when a circuit needs to be cut off, the gas generating device generates high-pressure gas to push the piston firing pin to cut off the breakable metal sheet downwards and insert the breakable metal sheet into the arc extinguishing narrow slit of the lower shell, an arc is stretched in the narrow slit and is cooled by the inner wall of the lower shell, and meanwhile, the inner wall of the lower shell and the front section of the firing pin generate gas under the ablation of the arc so as to form a high-temperature and high-pressure arc extinguishing environment in the narrow space of the arc extinguishing narrow slit, and therefore the arc can be. In addition, after the electric arc enters the arc-extinguishing narrow slit, the electric arc can conduct two ends of the metal fuse, so that the metal fuse can be blown under the action of current to consume partial electric energy, and the capacity of breaking the electric arc of the breaker is improved. After the arc extinction is finished, high-temperature and high-pressure gas can enter the pressure relief cavity of the bottom cover through the bottom of the arc extinction narrow slit, so that the medium strength is recovered, and the overall arc extinction effect is improved.

The scheme has the following advantages:

1. the arc extinguishing fuse does not need to be connected in parallel, and the problem of aging of a parallel fuse wire does not exist;

2. reliable breaking from zero current to short-circuit current can be realized;

3. the structure is simple, the volume is small and exquisite, the sealing performance is better, and the device is suitable for various environmental conditions;

4. the insulation resistance is higher after breaking;

5. the capacity of breaking the electric arc of the breaker can be improved by matching the metal fuse wire with the arc extinguishing narrow slit.

Drawings

Fig. 1 is a schematic diagram of an overall structure of an instantaneous breaker according to an embodiment of the present invention;

fig. 2 is an exploded view of a momentary interrupter provided by an embodiment of the present invention;

fig. 3 is an internal sectional view of an instantaneous interrupter provided in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a metal fuse;

FIG. 5 is a schematic view of the piston firing pin;

FIG. 6 is a schematic view of another angle of the upper housing;

FIG. 7 is a structural schematic of the bottom cover;

fig. 8 is a structural schematic view of the lower housing at another angle.

In the drawings, each reference numeral denotes:

1. a lower housing; 11. arc extinguishing narrow slits; 12. a baffle plate; 111. an arc extinguishing channel; 112. a flange channel; 121. a flow guide hole; 2. a conductive portion; 21. a breakable metal sheet; 22. a first conductive terminal; 23. a second conductive terminal; 211. a through hole; 3. an upper housing; 31. a piston channel; 311. a guide groove; 4. a bottom cover; 41. a pressure relief cavity; 42. a baffle; 421. a flow guide channel; 5. a gas generating device; 6. a piston firing pin; 61. a piston head; 62. a striker; 611. accommodating grooves; 612. an annular groove; 621. a cutting part; 622. a flange portion; 7. a metal fuse; 71. an opening part; 72. a narrow neck; 8. and a top cover.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 2, an instantaneous breaker according to an embodiment of the present invention includes: a lower case 1, a conductive part 2, an upper case 3, a bottom cover 4, a gas generating device 5, a plunger striker 6, and a metal fuse 7.

An arc extinguishing narrow slit 11 is formed in the upper edge of the lower shell 1 along the first direction; the metal fuse 7 is arranged in the lower shell 1 and penetrates through the arc extinguishing narrow slit 11 along a second direction, the metal fuse 7 is bent into a set shape, so that openings 71 are formed at two ends of the metal fuse 7, the openings 71 correspond to the arc extinguishing narrow slit 11, and the second direction is perpendicular to the first direction; the conductive part 2 is arranged on the lower shell 1, the middle part of the conductive part 2 is provided with a breakable metal sheet 21, and the breakable metal sheet 21 corresponds to the arc-extinguishing narrow slit 11; the upper shell 3 covers the conductive part 2 in a buckling manner and is detachably connected with the lower shell 1 so as to be matched with the lower shell 1 to clamp the conductive part 2 together, a piston channel 31 is formed in the upper shell 3 along a first direction, a gas generating device 5 and a piston firing pin 6 are sequentially arranged in the piston channel 31 from top to bottom, the piston firing pin 6 corresponds to the breakable metal sheet 21, and the gas generating device 5 can be electrically connected with an external detection circuit and is used for receiving signals and generating high-pressure gas so as to push the piston firing pin 6 to cut the breakable metal sheet 21 and insert the breakable metal sheet into the arc extinguishing narrow slit 11 and cut the metal fuse 7 positioned in the arc extinguishing narrow slit 11; the bottom cover 4 is disposed at an end of the lower case 1 far from the upper case 3 to cooperate with the lower case 1 to form a pressure relief cavity 41, and the pressure relief cavity 41 is communicated with the arc extinguishing narrow slit 11.

In this embodiment, during normal operation, current passes through the conductive part 2, when it is necessary to cut off the circuit, the gas generating device 5 generates high-pressure gas to push the piston striker 6 to cut off the breakable metal piece 21 downward and insert into the arc-extinguishing narrow slit 11 of the lower housing 1, the arc is elongated in the arc-extinguishing narrow slit 11 and cooled by the inner wall of the lower housing 1, and at the same time, the inner wall of the lower housing and the front section of the striker generate gas under arc ablation to form an arc-extinguishing environment with high temperature and high pressure in the narrow space of the arc-extinguishing narrow slit 11, so that the arc can be extinguished quickly. In addition, after the arc enters the arc-extinguishing narrow slit 11, the arc conducts the two ends of the metal fuse 7, so that the metal fuse 7 can be blown under the action of current to consume part of electric energy, and the capacity of the breaker for breaking the arc is improved. After the arc extinction is finished, high-temperature and high-pressure gas can enter the pressure relief cavity 41 of the bottom cover 4 through the bottom of the arc extinction narrow slit 11, so that the medium strength is recovered, and the overall arc extinction effect is improved.

Therefore, the instant breaker has the following advantages when the arc is extinguished: 1. the arc extinguishing fuse does not need to be connected in parallel, and the problem of aging of a parallel fuse wire does not exist; 2. reliable breaking from zero current to short-circuit current can be realized; 3. the structure is simple, the volume is small and exquisite, the sealing performance is better, and the device is suitable for various environmental conditions; 4. the insulation resistance is higher after breaking; 5. the capacity of breaking the electric arc of the breaker can be improved by matching the metal fuse wire with the arc extinguishing narrow slit.

In the above embodiment, the shape of the metal fuse 7 is not limited. The metal fuse 7 is equivalent to a section of metal wire, the opening 71 of the metal fuse 7 corresponds to the arc-extinguishing narrow slit 11, when an arc enters the arc-extinguishing narrow slit 11, the arc can conduct two ends of the metal fuse 7, and at the moment, the metal fuse is equivalent to a short-circuited wire, so that part of electric energy can be consumed to blow the short-circuited wire, and therefore, the arc energy which can be born by an instantaneous breaker can be improved, namely, the capacity of the breaker for breaking the arc is improved. Meanwhile, the metal fuse 7 is provided with a plurality of rows of narrow necks 72, each row of narrow necks 72 is fused and arcing under large current, and arc extinguishing materials mainly comprising quartz sand filled around the metal fuse 7 can absorb arc energy and generate higher arc voltage so as to accelerate the extinguishing of the arc. Referring to fig. 4, in the present embodiment, the metal fuse 7 is bent into a rectangular shape by a metal plate, and two ends of the rectangular metal fuse 7 form an opening, in other embodiments, the metal fuse 7 may be bent into various shapes such as a circle, an ellipse, a triangle, a polygon, etc., as long as it is ensured that the metal fuse 7 can conduct when an arc enters the arc-extinguishing narrow slit 11. The material of the metal fuse 7 is not limited, and may be made of copper or silver in general, and an appropriate metal material may be selected according to the use environment.

It should be understood that, in the present embodiment, the metal fuse 7 passes through the arc-extinguishing slit 11 along the second direction, and the second direction is perpendicular to the first direction. The purpose of passing the metal fuse 7 through the arc-extinguishing narrow slit 11 in the second direction is that when the arc energy entering the arc-extinguishing narrow slit 11 is small, the current will flow in the metal fuse 7, and at this time, if the arc energy is not enough to blow the metal fuse 7, the metal fuse 7 needs to be cut by the piston striker 6, so as to achieve the effect of arc extinguishing. If the metal fuse 7 does not pass through the arc-extinguishing slit 11, the metal fuse 7 cannot be cut, and therefore, for a small current, the metal fuse 7 always exists in the metal fuse 7, so that actual arc extinguishing cannot be achieved, and the risk of electric shock exists. Therefore, the metal fuse 7 is conducted by utilizing the current, if the current is large, the metal fuse 7 is directly blown, so that partial electric energy is consumed, and if the current is small, the metal fuse 7 cannot be blown, the metal fuse 7 is directly cut off through the piston firing pin 6, so that the effect of complete arc extinction is achieved, and the overall arc extinction effect of the instant breaker is improved.

In the above embodiment, preferably, the conductive portion 2 includes the first conductive terminal 22 and the second conductive terminal 23, the first end of the breakable metal piece 21 is welded and fixed to the first conductive terminal 22, and the second end of the breakable metal piece 21 is welded and fixed to the second conductive terminal 23. Therefore, the first conductive terminal 22 and the second conductive terminal 23 can be set to be conductive metal plates with high strength, so as to be convenient for structural connection with other parts, so as to improve connection strength, meanwhile, the breakable metal sheet 21 can be made of metal thin sheets with low strength, generally silver sheets or copper sheets, or a plurality of through holes 211 are formed in the breakable metal sheet 21 so as to reduce the structural strength of the breakable metal sheet 21, so as to be convenient for cutting off the breakable metal sheet 21.

In the above embodiment, preferably, the upper housing 3, the lower housing 1 and the piston striker 6 are made of insulating materials, so that electric leakage can be avoided during arc extinguishing, which is beneficial to improve the safety of arc extinguishing. Go up accessible bolted connection between casing 3 and the lower casing 1 to make go up casing 3 and can dismantle with lower casing 1, after utilizing last casing 3 and lower casing 1 to compress tightly conductive part 2 fixed, the gap shutoff between accessible jelly will go up casing 3, lower casing 1 and conductive part 2, in order to improve the leakproofness of product. Among them, it is preferable that the main component of the insulating material is usually POM (polyoxymethylene), PA66(polyamide66, nylon 66), PBT (Polybutylene terephthalate, polytetramethylene terephthalate), etc., and a certain proportion of glass fiber is usually added for increasing the strength.

Referring to fig. 5, in the above embodiment, it is preferable that the plunger pin 6 includes a plunger head 61 and a pin 62; the piston head 61 contacts the gas generating device 5, and the striker 62 is disposed on the piston head 61 on a side far from the gas generating device 5. referring to fig. 6, a guide slot 311 is formed on an inner wall of the piston passage 31 along the first direction, and a side wall of the striker 62 is located in the guide slot 311, so that the piston head 61 can push the striker 62 to move along the guide slot 311. Specifically, the end of the piston head 61 is provided with an accommodating groove 611, and in a normal condition, the gas generating device 5 is accommodated in the accommodating groove 611, and when the gas generating device 5 receives a signal sent by the detection circuit, high-pressure gas is generated, so that the piston head 61 is pushed to move along the piston channel 31, and further the piston head 61 pushes the striker 62 to move along the guide groove 311 until the striker 62 cuts off the breakable metal piece 21 and then inserts into the arc extinguishing narrow slit 11. Thus, the striker 62 can be restricted by the engagement between the side wall of the striker 62 and the guide groove 311, and the striker 62 can be prevented from rotating, thereby avoiding the situation in which the striker 62 cannot be inserted into the arc-extinguishing slit 11 due to a positional deviation. In addition, in the present embodiment, the outer wall of the piston head 61 and the inner wall of the piston channel 31 are in interference fit, so that the striker 62 can be stabilized above the breakable metal sheet 21 under normal conditions, so as to avoid the striker 62 from damaging the breakable metal sheet 21 under a vibration condition, and improve the safety of the use of the breaker; meanwhile, the interference fit degree needs to meet the requirement that when the piston head 61 is impacted by high-pressure gas, the piston head can be separated from the constraint of the interference fit, so that the striker 62 is driven to impact towards the breakable metal sheet 21.

As shown in fig. 5, in the above embodiment, it is preferable that the striker 62 includes the cut-off portion 621 and the flange portion 622, the cut-off portion 621 is disposed on the piston head 61 on the side far from the gas generating device 5, and the flange portion 622 is disposed on both sides of the cut-off portion 621, so that the cut-off portion 621 and the flange portion 622 form an "i" shape together; accordingly, the arc-extinguishing narrow slit 11 has an arc-extinguishing passage 111 and flange passages 112, and the flange passages 112 are disposed on both sides of the arc-extinguishing passage 111, so that the arc-extinguishing narrow slit 11 forms an "i" shape, and when the gas-generating device 5 pushes the piston head 61 to move along the piston passage 31, the cutting portion 621 is driven to cut off the breakable metal sheet 21 and insert the breakable metal sheet into the arc-extinguishing passage 111, and the flange portion 622 is driven to insert into the flange passages 112. The width of the cutting part 621 is greater than the width of the breakable metal sheet 21 and is located right above the breakable metal sheet 21, and the bottom of the cutting part 621 is provided with an inclined surface, so that the bottom of the cutting part 621 forms a tip, thereby facilitating cutting of the metal sheet 21. Meanwhile, the flange 622 can enhance the overall strength of the striker 62, and prevent the cutting portion 621 from bending when the breakable metal piece 21 is cut; on the other hand, the movement of the flange portion 622 in the flange passage 112 can guide the movement of the cutting portion 621, so that the guiding effect of the cutting portion 621 is enhanced by the guide groove 311. The flange 622 also increases the creepage distance between the first and second

conductive terminals

22 and 23, and prevents the arc from bypassing the cut-off portion 621 to conduct.

In the above embodiment, preferably, the piston plunger 6 is of an integrally formed structure, so that the assembly process in the later period is avoided, the production flow is simplified, and the production efficiency is improved.

In the above embodiment, preferably, the piston head 61 is provided with an annular groove 612, and a sealing ring (not shown) is disposed in the annular groove 612 for sealing a gap between an outer wall of the piston head 61 and an inner wall of the piston channel 31. Therefore, after the gas generating device 5 generates high-pressure gas, the gas does not leak from the gap between the outer wall of the piston head 61 and the inner wall of the piston channel 31, so that sufficient pushing force can be provided for the piston striker 6, and the piston striker 6 can be ensured to cut off the breakable metal sheet 21.

Referring to fig. 7, in the above embodiment, preferably, two flow deflectors 42 parallel to each other are disposed in the bottom cover 4, and the two flow deflectors 42 are disposed along the first direction, so that a flow guide channel 421 is formed between the two flow deflectors 42, the top of the flow guide channel 421 is communicated with the arc extinguishing narrow slit 11, and two sides of the flow guide channel 421 are communicated with the pressure relief cavity 41. Specifically, in this embodiment, after the arc extinguishing is completed, the high-temperature and high-pressure gas can enter the flow guide channel 421 through the bottom of the arc extinguishing narrow slit 11, and then flow into the pressure relief cavity 41 through the two sides of the flow guide channel 421, so that the pressure inside the arc extinguishing narrow slit 11 can be prevented from reducing too fast to affect the arc extinguishing effect.

Referring to fig. 8, in the above embodiment, preferably, the bottom of the arc-extinguishing narrow slit 11 is provided with a baffle 12, the baffle 12 is provided with a plurality of diversion holes 121, and the diversion holes 121 are communicated with the diversion channel 421. Therefore, the bottom of the arc extinguishing narrow slit 11 can be sealed to a certain degree by the baffle 12, so that the pressure in the arc extinguishing narrow slit 11 can be kept in a high-pressure state, and arc extinguishing is facilitated. Meanwhile, the flow guide hole 121 is arranged, so that the high-pressure gas after arc extinguishing is completed can enter the flow guide channel 421 through the flow guide hole 121 and then flows into the pressure relief cavity 41 through two sides of the flow guide channel 421. It is easy to understand that, when the whole opening area of the diversion hole 121 is large, the pressure in the arc extinguishing narrow slit 11 decreases faster, and when the whole opening area of the diversion hole 121 is small, the pressure in the arc extinguishing narrow slit 11 decreases slower, and in specific design, the diversion holes 121 with different opening sizes can be designed according to different use environments, and the number of the diversion holes 121 can be determined as required.

Referring to fig. 1 and 2, in the above embodiment, preferably, the instantaneous interrupter further includes a top cover 8, and the top cover 8 is covered on the upper case 3 and detachably coupled to the upper case 3. Specifically, the top cover 8 can be connected to the upper housing 3 through bolts, so that the situation that dust, particles and other impurities enter the instantaneous breaker to influence the use of the instantaneous breaker is avoided.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An instantaneous interrupter, comprising:

2. The momentary interrupter of claim 1, wherein the plunger firing pin comprises a piston head and a firing pin; the piston head is in contact with the gas generating device, the striker is arranged on the piston head at one side far away from the gas generating device, a guide groove is formed in the inner wall of the piston channel along the first direction, and the side wall of the striker is positioned in the guide groove, so that the piston head can push the striker to move along the guide groove.

3. The instantaneous interrupter of claim 2, wherein the striker includes a cutting portion disposed on a side of the piston head distal from the gas generating device and a flange portion disposed on both sides of the cutting portion such that the cutting portion and the flange portion together form an "i" shape;

4. The instantaneous circuit breaker of claim 2, wherein the piston head defines an annular groove, and a sealing ring is disposed in the annular groove for sealing a gap between the outer wall of the piston head and the inner wall of the piston passage.

5. The instantaneous circuit breaker of claim 1, wherein two parallel flow deflectors are disposed in the bottom cover, and the two flow deflectors are disposed along the first direction, so that a flow guiding channel is formed between the two flow deflectors, the top of the flow guiding channel is communicated with the arc extinguishing narrow slit, and two sides of the flow guiding channel are communicated with the pressure relief cavity.

6. The instantaneous interrupter of claim 5, wherein a baffle is disposed at the bottom of the arc-extinguishing narrow slit, and a plurality of flow-guiding holes are formed in the baffle and are communicated with the flow-guiding channel.

7. The instantaneous interrupter of claim 1, further comprising a top cover provided on the upper housing and detachably connected to the upper housing.

8. An instantaneous interrupter according to any one of claims 1 to 7, wherein the upper housing, the lower housing and the plunger striker are made of an insulating material.

9. An instantaneous circuit breaker according to any one of claims 1 to 7, characterized in that the breakable metal sheet is provided with a plurality of through holes.

10. An instantaneous circuit breaker according to any one of claims 1 to 7, characterized in that the conductive portion comprises a first conductive terminal and a second conductive terminal, the first end of the breakable metal sheet is welded and fixed to the first conductive terminal, and the second end of the breakable metal sheet is welded and fixed to the second conductive terminal.