CN220085947U - Circuit protection device - Google Patents

Abstract

The utility model relates to a circuit protection device, which is used for protecting a circuit and comprises a shell, an excitation source, an impact piece, a conductive piece and an insulating isolation piece, wherein the conductive piece divides the interior of the shell into a first cavity and a second cavity; the impact piece comprises an impact part and a plurality of stop parts, and the stop parts are fixedly connected with the impact part; when the excitation source is started under the preset condition, the excitation source is used for providing primary power for the impact part so that the impact part impacts the conductive piece and the middle part of the conductive piece is disconnected, the disconnected part of the conductive piece has a trend of moving towards the second cavity, the impact part can be inserted into the insulating isolation piece, the stop part can enter the second cavity along with the impact part, and a gap is reserved between the stop part and the conductive piece. The impact member has inertia, and when the impact portion impacts the conductive member under a preset condition, the stopper portion has a force generated by the inertia to be applied to the conductive member through the impact portion.

Description

Circuit protection device

Technical Field

The utility model relates to the technical fields of electric power and new energy, in particular to a circuit protection device.

Background

Along with the development of the technical fields of the electric power field and the new energy field, the circuit protection device can improve the safety of equipment of a circuit where the circuit protection device is located, and in the traditional technology, the time required for disconnecting a conductive piece in the circuit breaking device is long, so that the breaking time is long, and the electronic equipment in the circuit where the circuit protection device is located is easy to damage.

Disclosure of Invention

Based on this, it is necessary to provide a circuit protection device.

The utility model provides a circuit protection device which is used for protecting a circuit and comprises a shell, an excitation source, an impact piece, a conductive piece and an insulating isolation piece, wherein the conductive piece divides the interior of the shell into a first cavity and a second cavity, the excitation source is arranged on the shell, the impact piece is arranged in the first cavity, and the insulating isolation piece is arranged in the second cavity;

the impact piece comprises an impact part and a plurality of stop parts, and the stop parts are fixedly connected with the impact part;

when the excitation source is started under a preset condition, the excitation source is used for providing primary power for the impact part, so that the impact part impacts the conductive piece and breaks the middle part of the conductive piece, the breaking part of the conductive piece has a trend of moving towards the second cavity, the impact part can be inserted into the insulating isolation piece, and the stop part can enter the second cavity along with the impact part.

The impact part and the stop part are provided with inertia, when the impact part obtains primary power from the excitation source to impact the conductive part under the preset condition, acting force generated by the inertia of the stop part is applied to the conductive part through the impact part, the impact force on the unit area of the conductive part is increased, the impact part can be ensured to rapidly break the conductive part, breaking time is shortened, and the safety of electronic equipment protected by the circuit protection device is improved.

In one embodiment, when the impact portion is inserted into the insulating spacer, a first slit is formed between the stopper portion and the inner peripheral wall of the housing.

The electric arc that the impact portion impacted the conducting piece produced like this, and first narrow slit provides the heat dissipation space for getting into electric arc wherein, reduces the temperature of electric arc, improves and removes the free effect, avoids appearing the phenomenon that electric arc reburns in first narrow slit or the second cavity.

In one embodiment, the number of the stopping parts is four, and the four stopping parts are arranged at intervals on the periphery of the impact part; the inner cavity of the shell is a cylindrical space, and the stop part is a sector column.

The arrangement is that the first narrow slit is in a fan shape, so that accumulation in an arc gap is avoided, and the phenomenon of arc re-burning in the first narrow slit is avoided; after the impact part impacts the conductive piece, stress born by the inner peripheral wall of the shell is uniformly distributed, so that the phenomenon of stress concentration of the inner peripheral wall of the shell is avoided, and the shell is prevented from being damaged.

In one embodiment, the second chamber is filled with an arc extinguishing medium, and the stop part is used for extruding the arc extinguishing medium when the impact part is inserted into the insulating spacer.

By the arrangement, the current limiting capacity of the arc extinguishing medium can be improved, the arc extinguishing medium is fully contacted with an electric arc, the gap between the arc extinguishing medium is reduced, and the temperature of the second chamber in the arc extinguishing time is reduced; avoiding arc aggregation in the gap to reburning the arc and shortening the arc extinguishing time.

In one embodiment, the impact member is further provided with a spacer slot, and when the impact portion is inserted into the insulating spacer, the arc extinguishing medium can enter the spacer slot.

The arrangement is that the spacing groove provides a containing space for the arc extinguishing medium, the temperature of the arc in the spacing groove is reduced by the arc extinguishing medium, and the arc aggregation in the spacing groove is avoided; the interval slot reduces the gap between the arc extinguishing mediums entering the interval slot, improves the current limiting capacity of the arc extinguishing mediums, avoids the phenomenon of arc reignition in the interval slot, and shortens the arc extinguishing time.

In one embodiment, the quenching medium is quenching wire or quartz sand.

The arrangement reduces the production cost generated by the arc extinguishing medium and improves the suitability of the circuit protection device; when the impact part breaks the conductive piece, the arc extinguishing medium can buffer the impact part, so that the shell is prevented from being damaged by the impact part; the arc extinguishing medium can prevent or hinder the impact part from impacting the metal fragments formed by the conductive piece to burn the shell.

In one embodiment, the impact part is provided with at least two inserting grooves, the two inserting grooves are arranged in parallel and extend along the movement direction of the impact part, and the inserting grooves are blind grooves; when the impact piece is inserted into the insulating isolation piece, the insulating isolation piece is inserted into the insertion groove, and a second narrow slit is formed between the insulating isolation piece and the impact part.

When the impact part impacts the conductive piece, the gas in the plug-in groove forms dynamic pressure on the conductive piece, so that the time required by disconnection of the conductive piece is shortened, the time before an arc is shortened, and when the conductive piece is disconnected, the gas in the plug-in groove can enable the disconnected conductive piece to be close to the shell, and the arc temperature is reduced; the second narrow slit can prolong the arc, shorten the arc extinguishing time and improve the arc extinguishing efficiency, thereby protecting the circuit protected by the circuit protection device.

In one embodiment, the impact part comprises a first impact sheet and second impact sheets symmetrically arranged on two sides of the first impact sheet, and the insertion groove is formed between the first impact sheet and the second impact sheet; the axial length of the first impact sheet is larger than that of the second impact sheet.

When the impact part is used for impacting the conductive part for the first time, the impact part forms an impact area for the conductive part, and the impact area is formed by the first impact piece, so that fragments generated by disconnection of the impact area of the conductive part are reduced, and the situation that the shell is burnt by the fragments is avoided or reduced.

In one embodiment, an end of the second impact piece, which is close to the insulating spacer, is provided with an inclined surface facing the spacing groove, and the axial length of the stop portion is greater than or equal to the axial length of the first impact piece.

So set up, after the conducting piece is washed to first impact piece, the gas direction conducting piece disconnection's in the inclined plane will interval the inslot both ends, makes disconnected conducting piece be close to the casing, reduces or avoids the resistance that the second impact piece motion received, reduces or avoids the friction between second impact piece and the conducting piece, reduces electric arc temperature, shortens breaking time.

In one embodiment, the conductive member includes a first conductive portion disposed in the housing and two second conductive portions disposed outside the housing, a pre-break is formed in a middle portion of the first conductive portion, the two second conductive portions are respectively connected to two ends of the first conductive portion, and a cross-sectional area of the first conductive portion is smaller than a cross-sectional area of the second conductive portion.

So set up, improve the resistance of first conductive part, reduce the electric current that flows through the fracture department in advance, reduce the temperature of the electric arc that forms after the fracture is broken in advance, shorten the time of extinguishing the arc, improve the efficiency of extinguishing the arc.

Drawings

Fig. 1 is a schematic structural diagram of a circuit protection device according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the circuit protection device of FIG. 1 with A-A as a cross-sectional line when the conductive member is not broken;

FIG. 3 is an enlarged partial schematic view at B in FIG. 2;

FIG. 4 is a cross-sectional view of the circuit protection device of FIG. 1 with A-A as a cut line when the conductive member is plugged into the insulating spacer;

FIG. 5 is an enlarged partial schematic view of FIG. 4 at C;

FIG. 6 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 7 is a cross-sectional view of the circuit protection device with D-D as a cross-sectional line when the conductive member of FIG. 6 is not broken;

FIG. 8 is a cross-sectional view of the circuit protection device of FIG. 6 with E-E as a cross-sectional line after the conductive member is broken;

FIG. 9 is a schematic view of a partial enlarged structure at F in FIG. 8;

FIG. 10 is a schematic view of the impingement member of FIG. 1;

fig. 11 is a schematic view of the structure of fig. 10 at another view angle.

Reference numerals:

100. a circuit protection device; 10. a housing; 11. a first chamber; 12. a second chamber; 13. a first slot; 20. an excitation source; 30. an impact member; 31. an impact section; 311. a first impact plate; 312. a second impact plate; 3121. an inclined surface; 32. a stop portion; 33. a spacing groove; 34. a plug-in groove; 40. a conductive member; 41. a first conductive portion; 411. pre-breaking; 42. a second conductive portion; 50. an insulating spacer; 1. arc extinguishing medium; 2. and a second slit.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

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 utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Along with the development of the technical fields of the electric power field and the new energy field, the circuit protection device can improve the safety of equipment of a circuit where the circuit protection device is located, and in the traditional technology, the time required for disconnecting a conductive piece in the circuit breaking device is long, so that the breaking time is long, and the electronic equipment in the circuit where the circuit protection device is located is easy to damage.

Referring to fig. 1, fig. 1 shows a schematic structure of a circuit protection device 100 according to an embodiment of the utility model.

Referring to fig. 1 to 11, the present utility model provides a circuit protection device 100 for protecting a circuit, which includes a housing 10, an excitation source 20, an impact member 30, a conductive member 40 and an insulating spacer 50, wherein the conductive member 40 divides the interior of the housing 10 into a first chamber 11 and a second chamber 12, the excitation source 20 is mounted on the housing 10, the impact member 30 is disposed in the first chamber 11, and the insulating spacer 50 is disposed in the second chamber 12;

the impact piece 30 comprises an impact part 31 and a plurality of stop parts 32, and the stop parts 32 are fixedly connected with the impact part 31;

when the excitation source 20 is started under a preset condition, the excitation source 20 is used for providing initial power for the impact part 31, so that the impact part 31 impacts the conductive piece 40 and breaks the middle part of the conductive piece 40, the broken part of the conductive piece 40 has a tendency to move towards the second chamber 12, the impact part 31 can be inserted into the insulating spacer 50, and the stop part 32 can enter the second chamber 12 together with the impact part 31.

So set up, impact portion 31 and backstop portion 32 have inertia, when impact portion 31 obtains primary power from excitation source 20 under the preset condition and strikes electrically conductive piece 40, backstop portion 32 has the effort that inertia produced to apply on electrically conductive piece 40 through impact portion 31, receives the impact force increase in electrically conductive piece 40 unit area, ensures that impact portion can dash the electrically conductive piece off fast, shortens breaking time, improves the security of the electronic equipment that circuit protection device 100 protected.

It will be appreciated that in this embodiment, when the conductive member 40 is disconnected, the stop 32 does not impact the conductive member 40, and the stop 32 follows the path of movement of the impact 31 into the second chamber 12, and the conductive member 40 does not block movement of the stop 32.

Referring to fig. 8 to 9, in one embodiment, when the impact portion 31 is inserted into the insulating spacer 50, a first slit 13 is formed between the stopper portion 32 and the inner peripheral wall of the housing 10.

So arranged, the impact part 31 impacts the arc generated by the conductive element 40, the first narrow slit 13 provides a heat dissipation space for the arc entering the first narrow slit, the temperature of the arc is reduced, the dissociation effect is improved, and the phenomenon of arc re-burning in the first narrow slit 13 or the second chamber 12 is avoided.

Referring to fig. 7 to 8 and fig. 10 to 11, in one embodiment, the number of the stop portions 32 is four, and the four stop portions 32 are disposed at intervals on the periphery of the impact portion 31; the interior chamber of the housing 10 is a cylindrical space and the stop 32 is a sector.

The arrangement is that the first narrow slit 13 is in a fan shape, so that accumulation in an arc gap is avoided, and the phenomenon of arc re-ignition in the first narrow slit 13 is avoided; after the impact part 31 impacts the conductive member 40, the stress borne by the inner peripheral wall of the housing 10 is uniformly distributed, so that the phenomenon of stress concentration on the inner peripheral wall of the housing 10 is avoided, and the housing 10 is prevented from being damaged.

Alternatively, in the present embodiment, the first slit 13 is implemented as a sector ring shape, and in other embodiments of the present utility model, the first slit 13 may be implemented as a ring shape or a rectangular shape, as long as the phenomenon of arc re-ignition in the first slit 13 can be avoided.

Alternatively, in the present embodiment, the inner chamber of the housing 10 is implemented as a cylindrical space, and in other embodiments of the present utility model, the inner chamber of the housing 10 may be implemented as a rectangular space or a fan-shaped space, as long as the housing 10 can avoid breakage during use.

Alternatively, in the present embodiment, the stop 32 is implemented as a sector, and in other embodiments of the present utility model, the stop 32 may be implemented as a cylinder, a cuboid, or a square, as long as the stop 32 can follow the impact portion 31 into the second chamber 12.

Alternatively, in the present embodiment, the inner space of the housing 10 is implemented to be matched with the stop portion 32, and in other embodiments of the present utility model, the inner space of the housing 10 may be implemented to be different from the shape of the stop portion 32, so long as the arc re-burning phenomenon in the first slit 13 can be avoided.

Alternatively, in the present embodiment, the number of stop portions 32 is implemented as four, and in other embodiments of the present utility model, the number of stop portions 32 may be implemented as less than four or greater than four, as long as the stop portions 32 can follow the impact portion 31 into the second chamber 12.

Referring to fig. 2 to 5 and 8, in one embodiment, the second chamber 12 is filled with the arc extinguishing medium 1, and the stop portion 32 is used for pressing the arc extinguishing medium 1 when the impact portion 31 is inserted into the insulating spacer 50.

By the arrangement, the current limiting capacity of the arc extinguishing medium 1 can be improved, the arc extinguishing medium 1 is fully contacted with an electric arc, the gap between the arc extinguishing mediums 1 is reduced, and the temperature of the second chamber 12 in the arc extinguishing time is reduced; avoiding arc aggregation in the gap to reburning the arc and shortening the arc extinguishing time.

Alternatively, in the present embodiment, the fourth fifth of the chambers in the second chamber 12 are filled with the arc extinguishing medium 1, and in other embodiments of the present utility model, the second chamber 12 may be implemented such that the fourth fifth of the chambers are filled with the arc extinguishing medium 1 or the fourth fifth of the chambers are filled with the arc extinguishing medium 1, so long as the arc extinguishing medium 1 can shorten the arc extinguishing time.

Alternatively, in the present embodiment, the second chamber 12 is filled with the arc extinguishing medium 1, and in other embodiments of the present utility model, the second chamber 12 may be implemented without being filled with the arc extinguishing medium 1, as long as the circuit protection device 100 is capable of protecting the circuit.

Referring to fig. 8 to 11, in one embodiment, the impact member 30 is further provided with a spacer groove 33, and when the impact portion 31 is plugged with the insulating spacer 50, the arc extinguishing medium 1 can enter the spacer groove 33.

So arranged, the spacing groove 33 provides a containing space for the arc extinguishing medium 1, the arc extinguishing medium 1 reduces the temperature of the electric arc in the spacing groove 33, and the electric arc in the spacing groove 33 is prevented from gathering; the spacing grooves 33 reduce the gap between the arc extinguishing mediums 1 entering the spacing grooves, improve the current limiting capacity of the arc extinguishing mediums 1, avoid the phenomenon of arc re-burning in the spacing grooves 33, and shorten the arc extinguishing time.

Alternatively, the number of the partition grooves 33 is implemented as two in the present embodiment, and in other embodiments of the present utility model, the number of the partition grooves 33 may be implemented as more than two or less than two as long as the arc extinguishing time can be shortened.

Referring to fig. 1 to 11, in one embodiment, the quenching medium 1 is quenching wire or quartz sand.

By the arrangement, the production cost generated by the arc extinguishing medium 1 is reduced, and the suitability of the circuit protection device 100 is improved; when the impact part 31 breaks the conductive member 40, the arc extinguishing medium 1 can provide buffer for the impact part 31, so as to prevent the shell 10 from being damaged by the impact part 31; the arc extinguishing medium 1 can prevent or hinder the impact portion 31 from striking the metal chips formed by the conductive member 40 to burn the case 10.

Alternatively, in the present embodiment the extinguishing medium 1 is embodied as quartz sand or as extinguishing wire, and in other embodiments of the utility model the extinguishing medium 1 may also be embodied as aluminum oxide sand, as long as damage to the housing 10 is avoided.

Referring to fig. 3 and fig. 8 to fig. 11, in one embodiment, at least two inserting grooves 34 are formed on the impact portion 31, the two inserting grooves 34 are arranged in parallel and extend along the moving direction of the impact portion 31, and the inserting grooves 34 are blind grooves; when the impact member 30 is inserted into the insulating spacer 50, the insulating spacer 50 is inserted into the insertion groove 34, and a second narrow slit 2 is formed between the insulating spacer 50 and the impact portion 31.

When the impact part 31 impacts the conductive element 40, the gas in the inserting groove 34 forms dynamic pressure to the conductive element 40, so that the time required for disconnecting the conductive element 40 is shortened, the time before arc is shortened, and when the conductive element 40 is disconnected, the gas in the inserting groove 34 can enable the disconnected conductive element 40 to be close to the shell 10, and the arc temperature is reduced; the second slit 2 can lengthen the arc, shorten the arc extinguishing time, and improve the arc extinguishing efficiency, thereby protecting the circuit protected by the circuit protection device 100.

Alternatively, in the present embodiment, the number of the inserting grooves 34 is two, and in other embodiments of the present utility model, the number of the inserting grooves 34 may be more than two or less than two, as long as the circuit protection device 100 can protect the circuit in which it is located.

Alternatively, in the present embodiment, the number of the insulating spacers 50 is two, and in other embodiments of the present utility model, the number of the insulating spacers 50 may be more than two or less than two, as long as the circuit protection device 100 is capable of protecting the circuit in which it is located.

It is understood that in the present embodiment, the number of the inserting grooves 34 is adapted to the number of the insulating spacers 50, and in other embodiments of the present utility model, the number of inserting grooves 34 may be implemented to be greater than or less than the number of the insulating spacers 50, as long as the circuit protection device 100 is capable of protecting the circuit in which it is located.

Referring to fig. 10 to 11, in one embodiment, the impact portion 31 includes a first impact piece 311 and second impact pieces 312 symmetrically disposed on two sides of the first impact piece 311, and a plugging slot 34 is formed between the first impact piece 311 and the second impact piece 312; at least two of the second impact pieces 312 are provided, and the axial length of the first impact piece 311 is greater than the axial length of the second impact piece 312.

So configured, when the impact member 30 strikes the conductive member 40 for the first time, the impact portion 31 forms an impact area on the conductive member 40 formed by the first impact piece 311, so as to reduce the scraps generated by breaking the impact area of the conductive member 40, and avoid or reduce the case 10 from being burned by the scraps.

Alternatively, the number of the second impact pieces 312 is implemented as two in the present embodiment, and in other embodiments of the present utility model, the number of the second impact pieces 312 may be implemented as more than two or less than two as long as the breaking time can be shortened.

Alternatively, in the present embodiment, the two sides of the first impact piece 311 are symmetrically provided with the second impact piece 312, and in other embodiments of the present utility model, the second impact piece 312 may be obliquely provided on the peripheral side of the first impact piece 311, as long as the pre-arc time can be shortened.

Referring to fig. 2 to 5 and fig. 10 to 11, in one embodiment, an end of the second impact piece 312 near the insulating spacer 50 is provided with an inclined surface 3121 facing the spacing groove 33, and an axial length of the stop portion 32 is greater than or equal to an axial length of the first impact piece 311.

So set up, after the first impact piece 311 breaks the conductive piece 40, the inclined surface 3121 guides the gas in the interval groove 33 to the two broken ends of the conductive piece 40, so that the broken conductive piece 40 is close to the housing 10, the resistance of the second impact piece 312 is reduced or avoided, the friction between the second impact piece 312 and the conductive piece 40 is reduced or avoided, the arc temperature is reduced, and the breaking time is shortened.

Alternatively, the inclination angle of the inclined surface 3121 is implemented as 30 ° in the present embodiment, and in other embodiments of the present utility model, the inclination angle of the inclined surface 3121 may be implemented as more than 30 ° or less than 30 ° as long as the inclined surface 3121 is capable of guiding the gas in the interval groove 33 near the break of the conductive member 40.

It will be appreciated that in this embodiment the axis is embodied as being parallel to the direction of movement of the impingement member 30.

Referring to fig. 2 to 5 and fig. 7 to 8, in one embodiment, the conductive member 40 includes a first conductive portion 41 disposed in the housing 10 and two second conductive portions 42 disposed outside the housing 10, a pre-break 411 is formed in a middle portion of the first conductive portion 41, the two second conductive portions 42 are respectively connected to two ends of the first conductive portion 41, and a cross-sectional area of the first conductive portion 41 is smaller than that of the second conductive portion 42.

Thus, the resistance of the first conductive portion 41 is increased, the current flowing through the pre-break 411 is reduced, the temperature of the arc formed after the pre-break 411 is opened is reduced, the arc extinguishing time is shortened, and the arc extinguishing efficiency is improved.

Alternatively, in the present embodiment, the length and width of the first conductive portion 41 are both smaller than those of the second conductive portion 42, and in other embodiments of the present utility model, the width of the first conductive portion 41 may be equal to that of the second conductive portion 42 or the length of the first conductive portion 41 may be equal to that of the second conductive portion 42, as long as the resistance of the first conductive portion 41 is greater than that of the second conductive portion 42.

Alternatively, the pre-break 411 formed in the middle of the conductive portion in this embodiment is implemented as a V-shape, and in other embodiments of the present utility model, the pre-break 411 may be implemented as a U-shape or a square shape, as long as the first impact piece 311 can impact the pre-break 411 conveniently.

It will be appreciated that in the present embodiment, the pre-break 411 is implemented as one, and in other embodiments of the present utility model, the pre-break 411 may be implemented as more than one, as long as the breaking time can be shortened.

It can be appreciated that in the present embodiment, the circuit protection device 100 can adapt to a large circuit voltage range, for example, a high voltage circuit and a low voltage circuit, and the internal space of the circuit protection device 100 in the present embodiment is compact, the installation space required by the circuit protection device 100 is small, and the adaptability of the circuit protection device 100 is improved.

It can be understood that, in the present embodiment, the circuit protection device 100 is an excited fuse device, which has controllability and can break a circuit according to a structural manner of an intended design; the circuit protection device 100 has higher insulation strength, wherein the electric arc generated after the conductive member 40 is broken is effectively prolonged by the second narrow slit 2, and the electric arc and other structural designs for bending and extending enable the device to be miniaturized.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The circuit protection device is used for protecting a circuit and is characterized by comprising a shell, an excitation source, an impact piece, a conductive piece and an insulating isolation piece, wherein the conductive piece divides the interior of the shell into a first cavity and a second cavity, the excitation source is arranged in the shell, the impact piece is arranged in the first cavity, and the insulating isolation piece is arranged in the second cavity;

the impact piece comprises an impact part and a plurality of stop parts, and the stop parts are fixedly connected with the impact part;

when the excitation source is started under a preset condition, the excitation source is used for providing primary power for the impact part, so that the impact part impacts the conductive piece and breaks the middle part of the conductive piece, the breaking part of the conductive piece has a trend of moving towards the second cavity, the impact part can be inserted into the insulating isolation piece, and the stop part can enter the second cavity along with the impact part.

2. The circuit protection device of claim 1, wherein a first slot is formed between the stop portion and an inner peripheral wall of the housing when the strike portion is mated with the insulating spacer.

3. The circuit protection device according to claim 2, wherein the number of the stopper portions is four, and four stopper portions are provided at intervals on the outer periphery of the impact portion; the inner cavity of the shell is a cylindrical space, and the stop part is a sector column.

4. The circuit protection device of claim 1, wherein the second chamber is filled with an arc extinguishing medium, and the stop portion is configured to compress the arc extinguishing medium when the impact portion is inserted into the insulating spacer.

5. The circuit protection device of claim 4 wherein said strike member further defines a spacer slot into which said quenching medium can enter when said strike portion is mated with said insulating spacer.

6. The circuit protection device of claim 4, wherein the arc suppressing medium is an arc suppressing wire or quartz sand.

7. The circuit protection device according to claim 5, wherein the impact portion is provided with at least two plugging grooves, the two plugging grooves are arranged in parallel and extend along the movement direction of the impact portion, and the plugging grooves are blind grooves; when the impact piece is inserted into the insulating isolation piece, the insulating isolation piece is inserted into the insertion groove, and a second narrow slit is formed between the insulating isolation piece and the impact part.

8. The circuit protection device according to claim 7, wherein the impact portion comprises a first impact piece and second impact pieces symmetrically arranged on two sides of the first impact piece, and the insertion slot is formed between the first impact piece and the second impact piece; the axial length of the first impact sheet is larger than that of the second impact sheet.

9. The circuit protection device according to claim 8, wherein an end of the second impact piece, which is close to the insulating spacer, is provided with an inclined surface facing the spacing groove, and an axial length of the stopper portion is equal to or greater than an axial length of the first impact piece.

10. The circuit protection device according to claim 1, wherein the conductive member comprises a first conductive portion disposed in the housing and two second conductive portions disposed outside the housing, a pre-break is formed in a middle portion of the first conductive portion, the two second conductive portions are respectively connected to two ends of the first conductive portion, and a cross-sectional area of the first conductive portion is smaller than a cross-sectional area of the second conductive portion.