CN112382520B

CN112382520B - Instantaneous breaker

Info

Publication number: CN112382520B
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: 2024-07-02
Anticipated expiration: 2040-10-22
Also published as: CN112382520A

Abstract

The invention discloses an instantaneous breaker, which comprises a lower shell, wherein arc extinguishing narrow slits are formed in the lower shell along a first direction; the metal fuse wire is arranged in the lower shell, penetrates through the arc-extinguishing narrow slit along the second direction, is bent into a set shape, and forms opening parts at two ends, wherein 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 a breakable metal sheet which corresponds to the arc extinguishing narrow slit; the upper shell is covered on the conductive part 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 easily-broken metal sheet, and the gas generating device can push the piston firing pin to cut off the easily-broken metal sheet and insert 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 instantaneous breaker is matched with the metal fuse wire through the narrow slit to conduct arc extinction, and the overall arc extinction effect is improved.

Description

Instantaneous breaker

Technical Field

The invention relates to the field of electric power control and electric automobiles, in particular to an instantaneous breaker which utilizes narrow slits and metal fuses to jointly conduct arc extinction.

Background

When an internal cable short circuit or a collision accident occurs in the electric automobile, the circuit needs to be cut off rapidly so as to avoid the ignition of a battery pack and the electric shock of personnel; when a certain branch is short-circuited, the data center power supply needs to cut off the branch in ms-level time to avoid the breakdown of the whole network; in the occasion of adopting the power electronic device to realize the electric energy conversion, the instantaneous breaker is adopted to avoid the damage of the power electronic device to the greatest extent.

The instantaneous circuit breaker is divided into two major parts from the working principle: 1. the main conductor is broken by adopting a gas generating device, and an electric arc can be generated after the main conductor is broken; 2. it is sought to extinguish the arc on the main current conductor. The principle of the first part is basically consistent among the products and solutions already existing on the market, the main difference being the second part.

In a common breaker, a mode of connecting an arc extinguishing melt on a main conductor in parallel is adopted, when the main conductor is broken, current is transferred to the arc extinguishing melt, so that the arc extinguishing melt is fused, and arc extinction is realized by the arc extinguishing melt. However, this approach has the disadvantage that: (1) The arc extinguishing melt is always connected in parallel with the main conductor, and partial current can be shared during normal operation, so that the arc extinguishing melt can be aged and disabled in advance; (2) When the circuit current is zero or very small, the arc extinguishing melt can not be fused to keep electrical connection, and potential safety hazards of personnel electric shock exist.

Disclosure of Invention

The invention provides an instantaneous breaker, which is used for improving 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 instantaneous breaker, which comprises the following components:

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 covered on the conductive part and is detachably connected with the lower shell so as to match 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, 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 positioned in the arc-extinguishing narrow slit;

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

Preferably, the piston striker comprises a piston head and a striker; the piston head is contacted with the gas generating device, the firing pin is arranged on one side of the piston head 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 firing pin is positioned in the guide groove, so that the piston head can push the firing pin 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 generating device, and flange portions provided on both sides of the cutting portion so that the cutting portion and the flange portions form together an "i" shape;

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 the flange part into the flange channel.

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 parallel to each other are arranged in the bottom cover, and 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 release cavity.

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

Preferably, the device further comprises a top cover, wherein the top cover is arranged on the upper shell and detachably connected with the upper shell.

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

Preferably, the frangible metal sheet is provided with a plurality of through holes.

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

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

According to the instantaneous breaker provided by the technical scheme of the invention, when the instantaneous 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 easily-broken metal sheet downwards and insert the easily-broken metal sheet into the arc-extinguishing narrow slit of the lower shell, an electric arc is lengthened in the narrow slit and 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 arc ablation so as to form a high-temperature high-pressure arc-extinguishing environment in a narrow space of the arc-extinguishing narrow slit, so that the extinction of the electric arc can be accelerated. In addition, when the electric arc enters the arc extinguishing narrow slit, the electric arc can conduct the two ends of the metal fuse, so that the metal fuse can be blown under the action of current to consume part of electric energy, and the capacity of the breaker for breaking the electric arc 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 recovery of the medium strength is accelerated, and the overall arc extinction effect is improved.

The scheme has the following advantages:

1. the parallel arc extinguishing fuses are not needed, and the problem of ageing of the parallel fuses is solved;

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

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

4. The insulation resistance is higher after the breaking;

5. the arc breaking capability of the breaker can be improved through matching the metal fuse with the arc-extinguishing narrow slit.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a momentary breaker according to an embodiment of the invention;

FIG. 2 is an exploded view of a momentary interrupter provided in an embodiment of the invention;

FIG. 3 is an internal cross-sectional view of a momentary breaker provided by an embodiment of the invention;

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

FIG. 5 is a schematic view of the structure of a piston striker;

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

Fig. 7 is a schematic structure of the bottom cover;

fig. 8 is a schematic view of the structure 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; 111. arc extinguishing channel; 112. a flange channel; 121. a deflector aperture; 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 passage; 311. a guide groove; 4. a bottom cover; 41. a pressure relief cavity; 42. a deflector; 421. a diversion channel; 5. a gas generating device; 6. a piston striker; 61. a piston head; 62. a striker; 611. a receiving groove; 612. an annular groove; 621. a cutting section; 622. a flange portion; 7. a metal fuse; 71. an opening portion; 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 comprehensible, the technical solutions according to the embodiments of the present invention will be clearly described in the following with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 and 2, an instantaneous switch provided in an embodiment of the 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 pin 6, and a metal fuse 7.

An arc extinguishing narrow slit 11 is formed in the lower shell 1 along the first direction; the metal fuse 7 is arranged in the lower shell 1 and passes through the arc-extinguishing narrow slit 11 along a second direction, the metal fuse 7 is bent into a set shape, so that opening parts 71 are formed at two ends of the metal fuse 7, the opening parts 71 correspond to the arc-extinguishing narrow slit 11, and the second direction is mutually 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 is covered on the conductive part 2 and is detachably connected with the lower shell 1 so as to match 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, 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 off the breakable metal sheet 21 and insert into the arc extinguishing narrow slit 11 and cut off a metal fuse 7 positioned in the arc extinguishing narrow slit 11; the bottom cover 4 is arranged at one end of the lower shell 1 far away from the upper shell 3 so as to form a pressure relief cavity 41 together with the lower shell 1, 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, and when the circuit needs to be cut off, the gas generating device 5 generates high-pressure gas to push the piston striker 6 to cut off the frangible metal sheet 21 downwards and insert into the arc extinguishing slit 11 of the lower housing 1, the arc is elongated in the arc extinguishing slit 11 and cooled by the inner wall of the lower housing 1, and simultaneously, the inner wall of the lower housing and the front section of the striker generate gas under arc ablation to form a high-temperature and high-pressure arc extinguishing environment in the narrow space of the arc extinguishing slit 11, thereby accelerating the extinction of the arc. In addition, when the arc enters the arc extinguishing slit 11, the arc will conduct 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 arc breaking capacity of the breaker is improved. After the arc extinction is completed, 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 recovery of the medium strength is accelerated, and the overall arc extinction effect is improved.

Thus, the instantaneous breaker has the following advantages when being used for arc extinction: 1. the parallel arc extinguishing fuses are not needed, and the problem of ageing of the parallel fuses is solved; 2. reliable breaking from zero current to short-circuit current can be realized; 3. the structure is simple, the volume is small, the sealing performance is good, and the sealing device is suitable for various environmental conditions; 4. the insulation resistance is higher after the breaking; 5. the arc breaking capability of the breaker can be improved through matching the metal fuse with the arc-extinguishing narrow slit.

In the above embodiment, the shape of the metal fuse 7 is not limited. The metal fuse 7 corresponds to a section of metal wire, and when an arc enters the arc extinguishing slit 11, the two ends of the metal fuse 7 are conducted by the arc through the opening 71 of the metal fuse 7 corresponding to the arc extinguishing slit 11, and at this time, the metal fuse corresponds to a short-circuited wire, so that part of electric energy can be consumed to blow the short-circuited wire, and the arc energy which can be born by the instantaneous breaker can be improved, namely the arc breaking capacity of the breaker is improved. Meanwhile, a plurality of rows of narrow necks 72 are arranged on the metal fuse 7, each row of narrow necks 72 fuses and starts an arc under high current, and arc extinguishing materials filled around the metal fuse 7 and mainly made of quartz sand can absorb arc energy and generate higher arc voltage so as to accelerate the extinction of an arc. Referring to fig. 4, in this 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, and 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 be conducted when an arc enters the arc extinguishing slit 11. In addition, the material of the metal fuse 7 is not limited, and copper or silver may be generally selected, and a suitable metal material may be specifically selected according to the use environment.

It should be understood that, in this 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 first direction refers to the axial direction of the lower housing 1, and the second direction refers to the radial direction of the lower housing 1, and in this embodiment, the purpose of passing the metal fuse 7 through the arc extinguishing slit 11 along the second direction is that when the arc energy entering the arc extinguishing slit 11 is small, the current will flow in the metal fuse 7, and at this time, if the arc energy is insufficient to blow the metal fuse 7, the metal fuse 7 needs to be cut by the piston striker 6, so as to achieve the arc extinguishing effect. If the metal fuse 7 does not pass through the arc extinguishing slit 11, the metal fuse 7 cannot be cut off, so that the metal fuse 7 can always exist in the metal fuse 7 for small current, real arc extinction 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 part of electric energy is consumed, 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 thoroughly extinguishing arc is achieved, and the overall arc extinguishing effect of the instantaneous breaker is improved.

In the above embodiment, it is preferable that the conductive part 2 includes the first conductive terminal 22 and the second conductive terminal 23, the first end of the frangible metal plate 21 is welded to the first conductive terminal 22, and the second end of the frangible metal plate 21 is welded to the second conductive terminal 23. Therefore, the first conductive terminal 22 and the second conductive terminal 23 can be made of conductive metal plates with larger strength, so that structural connection with other components is facilitated, so as to improve the connection strength, meanwhile, the breakable metal sheet 21 can be made of metal sheets with smaller 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 that the breakable metal sheet 21 is conveniently cut off.

In the above embodiment, it is preferable that the upper case 3, the lower case 1, and the plunger pin 6 are all made of an insulating material, so that electric leakage can be avoided during arc extinction, which is advantageous in improving the safety of arc extinction. The upper shell 3 and the lower shell 1 can be connected through bolts, so that the upper shell 3 and the lower shell 1 can be detached, and after the conductive part 2 is pressed and fixed by the upper shell 3 and the lower shell 1, gaps among the upper shell 3, the lower shell 1 and the conductive part 2 can be plugged through jelly, so that the sealing performance of a product is improved. Among them, preferably, the main components of the insulating material are POM (polyoxymethylene), PA66 (polyamide 66, nylon 66), PBT (Polybutylene terephthalate, polymethyl terephthalate) and the like, and glass fiber is added in a certain proportion for increasing strength.

Referring to fig. 5, in the above embodiment, it is preferable that the piston striker 6 includes a piston head 61 and a striker 62; the piston head 61 is in contact with the gas generating means 5, the striker 62 is provided on the piston head 61 on a side away from the gas generating means 5, as shown in fig. 6, a guide groove 311 is provided on an inner wall of the piston passage 31 in the first direction, and a side wall of the striker 62 is positioned in the guide groove 311 so that the piston head 61 can push the striker 62 to move along the guide groove 311. Specifically, the end portion of the piston head 61 is provided with a receiving groove 611, and under normal conditions, the gas generating device 5 is accommodated in the receiving 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 the piston head 61 is further pushed to move along the guide groove 311 by the striker 62 until the striker 62 cuts off the breakable metal sheet 21 and inserts into the arc extinguishing slit 11. This allows the striker 62 to be restrained by the cooperation between the side wall of the striker 62 and the guide groove 311, thereby preventing the striker 62 from rotating, and further preventing the striker 62 from being 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 is in interference fit with the inner wall of the piston channel 31, so that the striker 62 can be stabilized above the frangible metal sheet 21 under normal conditions, so as to avoid damage of the striker 62 to the frangible metal sheet 21 under vibration conditions, and improve the use safety of the breaker; meanwhile, the interference fit is required to be satisfied that when the piston head 61 is impacted by high-pressure gas, the interference fit can be released, so that the striker 62 is driven to impact towards the frangible metal 21.

With continued reference to fig. 5, in the above embodiment, it is preferable that the striker 62 includes a cutting portion 621 and a flange portion 622, the cutting portion 621 being provided on the piston head 61 on the side far from the gas generating device 5, the flange portion 622 being provided on both sides of the cutting portion 621 such that the cutting portion 621 and the flange portion 622 form together an "h" shape; correspondingly, the arc-extinguishing slit 11 has an arc-extinguishing passage 111 and a flange passage 112, the flange passages 112 are disposed at both sides of the arc-extinguishing passage 111, so that the arc-extinguishing slit 11 forms an "h" 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 frangible metal sheet 21 and insert into the arc-extinguishing passage 111, and the flange portion 622 is driven to insert into the flange passage 112. Wherein, the width of the cutting part 621 is larger than the width of the breakable metal sheet 21 and is positioned right above the breakable metal sheet 21, and the bottom of the cutting part 621 forms a tip by providing an inclined surface at the bottom of the cutting part 621, thereby facilitating cutting of the metal sheet 21. Meanwhile, the flange 622 can strengthen the overall strength of the striker 62, and prevent the cutting portion 621 from bending when cutting the breakable metal sheet 21; on the other hand, the movement of the flange 622 in the flange passage 112 can guide the movement of the cutting portion 621, so that the guide effect on the cutting portion 621 can be improved in cooperation with the guide groove 311. The flange 622 can also increase the creepage distance between the first conductive terminal 22 and the second conductive terminal 23, and prevent the arc from conducting around the cutting portion 621.

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

In the above embodiment, it is preferable that the piston head 61 is provided with an annular groove 612, and a sealing ring (not shown in the figure) is provided in the annular groove 612 for sealing the gap between the outer wall of the piston head 61 and the inner wall of the piston channel 31. Thus, when 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 passage 31, so that sufficient thrust can be provided to the plunger pin 6, and the plunger pin 6 can be ensured to cut off the frangible metal plate 21.

Referring to fig. 7, in the above embodiment, preferably, two parallel flow guide plates 42 are disposed in the bottom cover 4, and the two flow guide plates 42 are disposed along the first direction, so that a flow guide channel 421 is formed between the two flow guide plates 42, the top of the flow guide channel 421 is communicated with the arc extinguishing slot 11, and two sides of the flow guide channel 421 are communicated with the pressure release cavity 41. Specifically, in this embodiment, when the arc extinction is completed, the high-temperature and high-pressure gas can enter the flow guiding channel 421 through the bottom of the arc extinction slit 11, and then flow into the pressure release cavity 41 through the two sides of the flow guiding channel 421, thereby avoiding that the pressure in the arc extinction slit 11 is reduced too fast to affect the arc extinction effect.

Referring to fig. 8, in the above embodiment, preferably, a baffle plate 12 is disposed at the bottom of the arc extinguishing slit 11, and a plurality of diversion holes 121 are formed in the baffle plate 12, 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 extent 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 extinction is facilitated. Meanwhile, by providing the diversion hole 121, the high-pressure gas after arc extinction can enter the diversion channel 421 through the diversion hole 121, and then flows into the pressure release cavity 41 through the two sides of the diversion channel 421. It is easy to understand that when the overall opening area of the deflector hole 121 is larger, the pressure in the arc extinguishing slit 11 drops faster, when the overall opening area of the deflector hole 121 is smaller, the pressure in the arc extinguishing slit 11 drops slower, and when the deflector hole 121 is specifically designed, the deflector holes 121 with different opening sizes can be designed according to different use environments, and the number of the deflector holes 121 can be determined according to needs.

As shown with reference to fig. 1 and 2, in the above embodiment, preferably, the momentary breaker further includes a top cover 8, and the top cover 8 is provided on the upper housing 3 and detachably connected with the upper housing 3. Specifically, the top cover 8 can be connected to the upper housing 3 by bolts, so that sundries such as dust and particles can be prevented from entering the instantaneous breaker, and the use of the instantaneous breaker is prevented from being influenced.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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

The above description is merely illustrative of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A momentary breaker, comprising:

2. The momentary interrupter of claim 1, wherein the plunger striker comprises a piston head and a striker; the piston head is contacted with the gas generating device, the firing pin is arranged on one side of the piston head 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 firing pin is positioned in the guide groove, so that the piston head can push the firing pin to move along the guide groove.

3. The momentary interrupter of claim 2, wherein the striker includes a cutoff portion provided on a side of the piston head remote from the gas generating device and flange portions provided on both sides of the cutoff portion such that the cutoff portion and the flange portions together form an "i" shape;

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

5. The instantaneous disconnect of claim 1, wherein two parallel deflectors are disposed in the bottom cover, and the two deflectors are disposed along the first direction such that a deflector channel is formed between the two deflectors, the top of the deflector channel is in communication with the arc extinguishing slot, and two sides of the deflector channel are in communication with the pressure relief cavity.

6. The instantaneous disconnect of claim 5, wherein a baffle is provided at the bottom of the arc-extinguishing slot, and wherein a plurality of deflector holes are provided in the baffle, the deflector holes being in communication with the deflector channel.

7. The momentary interrupter of claim 1, further comprising a top cover disposed on the upper housing and removably connected to the upper housing.

8. The momentary interrupter of any one of claims 1-7, wherein the upper housing, lower housing, and plunger striker are each made of an insulating material.

9. The momentary breaker according to any of claims 1-7, characterized in that the frangible metal sheet is provided with a plurality of through holes.

10. The momentary interrupter of any one of claims 1-7, wherein the conductive portion comprises a first conductive terminal and a second conductive terminal, the first end of the frangible metal sheet is welded to the first conductive terminal, and the second end of the frangible metal sheet is welded to the second conductive terminal.