CN205428854U - Circuit protection component - Google Patents

Abstract

The utility model provides a circuit protection component, drawing forth piece, first connection piece, second connection piece, fuse part and bimetallic strip including shell, the first piece, second of drawing forth, through first connection piece of fuse part control and first break -make of drawing forth the piece, drawing forth the break -make of piece through bimetallic strip control second connection piece and second, fuse part's fusing temperature is greater than bimetallic strip's deformation temperature simultaneously. The utility model provides a circuit protection component, can be shortly at the uniform temperature within range recoverable on -off control that carries on many times, again can be at complete open circuit under the extreme condition, again under the prerequisite that does not occupy a large amount of installation space, realize that temperature -sensing is unanimous simultaneously, can play duplicate protection to the circuit.

Description

A kind of circuit protecting element

Technical field

This utility model relates to circuit protection field, particularly relates to a kind of circuit protecting element.

Background technology

Recently as the lifting of the mobile electronic device performances such as mobile phone, the requirement to battery capacity improves the most year by year.The increase of the used current value of high capacity cell causes improving constantly the requirement of excess-current excess-temperature protection element.Resistance is low, be swift in motion, protect thoroughly, high request of can making a response the abnormal temperature of battery in time etc..The most common circuit protecting element is PTC, FUSE and Breaker.But the said goods cuts both ways really for the protection of circuit.Feature maximum for PTC is to be used for multiple times, and circuit can recover, but though the highest PTC-element of intensity, the most also can remaining leakage current during its action, although only hundreds of milliampere but still there is the hidden danger that battery cannot be suppressed to heat up；Advantage maximum for FUSE is cheap and can be fully disconnected by circuit, but the most absolute fusing can cause the waste of Large Copacity battery core；Breaker be the research and development of Komatsu of Japan by circuit protecting element associated with bimetal leaf and PTC, be characterized in that action also can be used for multiple times more rapidly, but price be relatively costly and still in the problem of leakage current.

Meanwhile, in Breaker, although the most recoverable break-make can be realized and control, but in actual use, probably due to the inefficacy of bimetal leaf or damage cause circuit to disconnect, burning of components and parts in circuit is directly resulted in；Therefore, during actual use, the circuit protection device of a fusible of usually arranging in pairs or groups, such as FUSE, even if ensureing, in the case of bimetal leaf damages or lost efficacy, to remain able to disconnecting circuit in extreme circumstances, prevent the generation of danger.But, such combination, in circuit, it is necessary to Breaker and FUSE is set simultaneously, occupy substantial amounts of space；Further, usually because the installation site of Breaker with FUSE is different, cause its temperature sensed inconsistent, bring certain risk to the protection of circuit.

Summary of the invention

This utility model is intended to solve at least one technical problem above-mentioned to a certain extent; there is provided one the most recoverable in certain temperature range can carry out break-make control shortly; circuit can be fully disconnected again in extreme circumstances; simultaneously again on the premise of being not take up a large amount of installing space; realize temperature sense consistent, it is possible to circuit is played the circuit protecting element of duplicate protection.

In order to solve above-mentioned technical problem, this utility model provides a kind of circuit protecting element, including shell；First lead-out tablet, described first lead-out tablet one end stretches into described enclosure, and the other end extend out to outside shell；Second lead-out tablet, described second lead-out tablet one end stretches into described enclosure, and the other end extend out to outside shell；A connecting piece, described a connecting piece is positioned at described enclosure, and described a connecting piece includes fuse end and the first connection end, and one end that described fusing end stretches into described enclosure with described first lead-out tablet electrically connects；Second connects sheet, and described second connects sheet is positioned at described enclosure, and described second connects sheet includes that contact jaw and second connects end, and described contact jaw is mobilizable with one end that described second lead-out tablet stretches into described enclosure to be electrically connected；Described second connects end and first connects end electrical connection；Fuse part, described fuse part stretches between one end of described enclosure at described fusing end and described first lead-out tablet, described fusing end stretches into one end of described enclosure and is connected by described fuse part is fixing with described first lead-out tablet, and described fuse part is used for fusing when the temperature of fuse part reaches fusing-off temperature and disconnect described fusing end and described first lead-out tablet stretches into the electrical connection between one end of described enclosure；Bimetal leaf, is positioned at enclosure, for deforming when the temperature of bimetal leaf reaches deformation temperature and driving described contact jaw to disconnect the electrical connection of the one end stretching into described enclosure with described second lead-out tablet；Described fusing-off temperature is more than described deformation temperature.

The circuit protecting element that this utility model provides, in circuit or in the middle of battery charge and discharge process, realize simultaneously in certain temperature range recoverable protection act repeatedly and when temperature reaches certain ultimate value fusing the function of disconnecting circuit forever.In the circuit protecting element that this utility model provides; the fusing end of a connecting piece and the first lead-out tablet are stretched into and are electrically connected by fuse part between one end of enclosure; the temperature sensed at circuit protecting element reaches a temperature extremes; during the fusing-off temperature of i.e. fuse part, disposably and permanently disconnecting circuit protection element；And the contact jaw of the second connection sheet is under the control of bimetal leaf, when reaching the deformation temperature of bimetal leaf, disconnecting circuit, and when temperature is recovered, it is again switched on circuit, it is achieved recoverable break-make repeatedly controls.Meanwhile, above-mentioned fusing-off temperature is more than deformation temperature, and i.e. in deformation temperature and following scope, circuit protecting element realizes repeatedly the effect of on-off control circuit；And when temperature rise to fusing-off temperature or above time, fuse part disconnect, permanent disconnecting circuit, play the double protection functions to circuit.It addition, in this utility model, above-mentioned functions connects sheets and can complete only by arranging two an enclosure, has saved the temperature ratio sensed at installing space and two break-make controls connecting sheets more consistent.

Preferably, described bimetal leaf is arranged on the described second side connecting sheet.

Preferably, described mobilizable electrically connect as: when bimetal leaf is in undeformed state, contact jaw and the second lead-out tablet stretch into one end electrical connection of described enclosure；When the temperature of bimetal leaf is more than or equal to deformation temperature, bi-metal plate deformed, the one end driving contact jaw and the second lead-out tablet to stretch into described enclosure disconnects electrical connection；When the temperature of bimetal leaf is reduced to recovery temperature, bimetal leaf recovers undeformed state, and contact jaw and the second lead-out tablet stretch into one end of enclosure and reverted to electrical connection by disconnecting electrical connection；Described recovery temperature is less than described deformation temperature.

Preferably, described fusing-off temperature is 85-105 DEG C.

Preferably, described deformation temperature is 60-80 DEG C.

Preferably, described recovery temperature is 30-45 DEG C.

Preferably, described bimetal leaf be shaped as dish.

Preferably, with making described fusing end and described first lead-out tablet stretch into the elastic force that one end of described enclosure disconnects on described a connecting piece.

Preferably, being provided with the first cavity and the second cavity in described shell, described a connecting piece is positioned at the first cavity, and described second connects sheet is positioned at the second cavity.

Further, it is the sheet metal of integral type that described a connecting piece and second connects sheet, and one end of described sheet metal is fusing end, and the other end of described sheet metal is contact jaw.

Preferably, it is provided with for by fixing for the mid portion of described sheet metal fixing device in the enclosure in described shell, the sheet metal being positioned at described fixing device side is described a connecting piece, and the sheet metal being positioned at described fixing device opposite side is described second connection sheet.

Preferably, enclosure is divided into the first cavity and the second cavity by described fixing device, and described a connecting piece is positioned at the first cavity, and described second connects sheet is positioned at the second cavity.

Preferably, described fixing device includes the first fixed part extended upward by outer casing bottom, and the mid portion of described sheet metal clamps and is fixed between described first fixed part and cover top portion.

Preferably, described cover top portion downwardly extends out the second fixed part, and the mid portion of described sheet metal clamps and is fixed between described first fixed part and the second fixed part.

Additional aspect of the present utility model and advantage will part be given in the following description, and part will become apparent from the description below, or is recognized by practice of the present utility model.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present utility model and advantage will be apparent from easy to understand, wherein from combining the accompanying drawings below description to embodiment:

Fig. 1 is the circuit protecting element normal condition schematic diagram that this utility model provides.

Fig. 2 is the circuit protecting element bimetal leaf 50 active state schematic diagram that this utility model provides.

Fig. 3 is the off-state schematic diagram after the circuit protecting element bimetal leaf 50 that this utility model provides lost efficacy.

Reference

Shell 10；First lead-out tablet 22；Second lead-out tablet 24；A connecting piece 32；Fusing end 322；First connects end 324；Second connects sheet 34；Contact jaw 342；Second connects end 344；Fuse part 40；Bimetal leaf 50；First cavity 60；Second cavity 62；Fixing device 70；First fixed part 72；Second fixed part 74.

Detailed description of the invention

Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to be used for explaining this utility model, and it is not intended that to restriction of the present utility model.

In description of the present utility model, it will be appreciated that, term " length ", " width ", " thickness ", on " ", D score, " front ", " afterwards ", " left ", " right ", " vertically ", " level ", " push up ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplifies description, rather than indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or more, unless otherwise expressly limited specifically.

In this utility model, unless otherwise clearly defined and limited, term " is installed ", " being connected ", " connection ", the term such as " fixing " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in this utility model can be understood as the case may be.

This utility model provides a kind of circuit protecting element, as it is shown in figure 1, include shell 10, or referred to as insulation crust 10.Whole circuit protecting element is provided and supports and protective effect by this shell 10, forms cavity therein；Generally, the miscellaneous part of circuit protecting element is arranged at shell 10 internal (except being extended to the first lead-out tablet 22 and the second lead-out tablet 24 outside shell 10 by shell 10 is internal).The material of above-mentioned shell 10 does not limits in this utility model, as long as insulant, such as liquid crystal polymer (LCP), phenolic resin, epoxy resin etc..

First lead-out tablet 22, it is internal that shell 10 is stretched in this first lead-out tablet 22 one end, for being electrically connected, such as a connecting piece 32 in Fig. 1 with the miscellaneous part within shell 10；And the other end of the first lead-out tablet 22 extend out to outside shell 10, for being attached with outside electric elements, circuit protecting element is connected in circuit.

Second lead-out tablet 24, it is internal that shell 10 is stretched in this second lead-out tablet 24 one end, for being electrically connected with the miscellaneous part within shell 10, such as the second connection sheet 34 in Fig. 1；And the other end of the second lead-out tablet 24 extend out to outside shell 10, for being attached with outside electric elements, so that circuit protecting element is connected in circuit.

Above-mentioned first lead-out tablet 22 and the second lead-out tablet 24, respectively as the both positive and negative polarity exit of circuit protecting element, connects this circuit protecting element in circuit；Simultaneously; first lead-out tablet 22 and the second lead-out tablet 24 are positioned at the part within shell 10; by the main part of circuit protecting element; as a connecting piece 32 and the second connection sheet 34 are attached; by a connecting piece 32 and the break-make of the second connection sheet 34 control circuit protection element, to realize the break-make of whole circuit.

A connecting piece 32, it is internal that this connecting piece 32 is positioned at shell 10, and a connecting piece 32 includes fuse end 322 and the first connection end 324, and one end that fusing end 322 stretches within shell 10 with the first lead-out tablet 22 electrically connects.

Second connects sheet 34, it is internal that this second connection sheet 34 is positioned at described shell 10, described second connects sheet 34 includes that contact jaw 342 and second connects end 344, and described contact jaw 342 stretches into described second lead-out tablet 24 that the one end within described shell 10 is mobilizable to be electrically connected；Described second connection end 344 is connected end 324 with first and electrically connects.

Can be provided with contact on above-mentioned contact jaw 342, this contact is to cover, by conductive material, the surface contacted at contact jaw 342 with the second lead-out tablet 24, or is otherwise in connection with together.Certainly, directly contact jaw 342 is stretched into the end thereof contacts within shell 10 with the second lead-out tablet 24 and be conductively connected also possible, do not limit at this.

Fuse part 40, described fuse part 40 stretches between the one end within described shell 10 at described fusing end 322 and described first lead-out tablet 22, described fusing end 322 stretches into one end within described shell 10 and is connected by described fuse part 40 is fixing with described first lead-out tablet 22, and described fuse part 40 is used for fusing when the temperature of fuse part 40 reaches fusing-off temperature and disconnects described fusing end 322 and described first lead-out tablet 22 stretches into the electrical connection between the one end within described shell 10.

Above-mentioned fuse part 40 can make entity structure, stretches into leave certain fuse part 40 installing space between the one end within shell 10 at fusing end 322 and the first lead-out tablet 22, fuse part 40 being arranged in this installing space；Now, after fuse part 40 is melted, fusing end 322 and the first lead-out tablet 22 stretch into the one end within shell 10 and will disconnect, thus disconnect whole circuit, it is achieved turn-off function.

Certainly, when fusing end 322 and the first lead-out tablet 22 stretch into and connect by the way of laminating between the one end within shell 10, as shown in Figure 1, above-mentioned fuse part 40 just can be placed between two binding faces, is attached one end that fusing end 322 and the first lead-out tablet 22 stretch within shell 10 by this fuse part 40.More specifically, fuse part 40 can be considered as weld fusing end 322 and the first lead-out tablet 22 stretch into one end solder layer within shell 10, this solder layer is between both binding faces；Now, a connecting piece 32 inherently needs possess certain elasticity or memory function, after fuse part 40 is melted, fusing end 322 can be bounced off the first lead-out tablet 22 and stretch into the one end within shell 10, without hanging thereon.More specifically, above-mentioned fuse part 40 can have alloy to make, and the melt temperature of this alloy is more than the deformation temperature of bimetal leaf 50.

Bimetal leaf 50, for deforming when reaching the deformation temperature of bimetal leaf 50 and driving the disconnection of described contact jaw 342 and described second lead-out tablet 24 to stretch into the electrical connection of the one end within described shell 10.

In this utility model, above-mentioned fusing-off temperature is more than deformation temperature.So could realize the double protection functions of this circuit protecting element.

The foregoing circuit protection element that this utility model provides, in circuit or in the middle of battery charge and discharge process, realize simultaneously in certain temperature range recoverable protection act repeatedly and when temperature reaches certain ultimate value fusing the function of disconnecting circuit forever.In the circuit protecting element that this utility model provides; the fusing end 322 of a connecting piece 32 and the first lead-out tablet 22 are stretched into and are electrically connected by fuse part 40 between the one end within shell 10; the temperature sensed at circuit protecting element reaches a temperature extremes; during the fusing-off temperature of i.e. fuse part 40, disposably and permanently disconnecting circuit protection element；And the contact jaw 342 of the second connection sheet 34 is under the control of bimetal leaf 50, when reaching the deformation temperature of bimetal leaf 50, disconnecting circuit, and when temperature is recovered, it is again switched on circuit, it is achieved recoverable break-make repeatedly controls.Meanwhile, above-mentioned fusing-off temperature is more than deformation temperature, and i.e. in deformation temperature and following scope, circuit protecting element realizes repeatedly the effect of on-off control circuit；And when temperature rise to fusing-off temperature or above time, fuse part 40 disconnects, permanent disconnecting circuit, plays the double protection functions to circuit.It addition, in this utility model, above-mentioned functions can complete only by arranging two connection sheets inside a shell 10, has saved the temperature ratio sensed at installing space and two break-make controls connecting sheets more consistent.

The whole work process of the circuit protecting element that this utility model provides, is referred to Fig. 1-3 and illustrates.

As shown in Figure 1; it it is the normal condition of circuit protecting element; i.e. battery or circuit does not has state that is overheated or that cross stream; the fusing end 322 of a connecting piece 32 stretches into the one end within shell 10 by fuse part 40 with the first lead-out tablet 22 and fixes and electrically connect, and the second contact jaw 342 connecting sheet 34 stretches into the end thereof contacts within shell 10 with the second lead-out tablet 24 and electrically connects.Now, bimetal leaf 50 is not reaching to deformation temperature, not deformation.

As in figure 2 it is shown, the state being circuit protecting element when bimetal leaf 50 can normally work and temperature has reached its deformation temperature, i.e. there is the overheated or phenomenon of overcurrent in battery or circuit, but this phenomenon is terminated by the deformation of bimetal leaf 50.The fusing end 322 of a connecting piece 32 keeps stretching into the one end within shell 10 with the first lead-out tablet 22 by fuse part 40 and fixes and electrically connect, and the second contact jaw 342 connecting sheet 34 has stretched into the one end within shell 10 under the metamorphosis of bimetal leaf 50 and disconnected with the second lead-out tablet 24.

As shown in Figure 3; it is that circuit protecting element was on the premise of bimetal leaf 50 lost efficacy or damaged; temperature has reached to there is the overheated or phenomenon of overcurrent in the state during fusing-off temperature of fuse part 40, i.e. battery or circuit, but now bimetal leaf 50 the most just lost efficacy or damaged.The fusing end 322 of a connecting piece 32 stretches into the one end within shell 10 with the first lead-out tablet 22 and separates because of the melted of fuse part 40 or disconnect；And because the inefficacy of bimetal leaf 50 or damage, the second contact jaw 342 connecting sheet 34 still stretches into the one end within shell 10 and keeps contacting with the second lead-out tablet 24.

In an embodiment of the present utility model, the second connection sheet is lamellar, and now, bimetal leaf i.e. can be arranged on the side of the second connection sheet 34.

In another embodiment, above-mentioned mobilizable electrically connect as: when bimetal leaf 50 is in undeformed state, one end that contact jaw 342 stretches within shell 10 with the second lead-out tablet 24 electrically connects；When the temperature of bimetal leaf 50 is more than or equal to deformation temperature, bimetal leaf 50 deforms, and one end disconnection driving contact jaw 342 to stretch into the second lead-out tablet 24 within shell 10 electrically connects；When the temperature of bimetal leaf 50 is reduced to recovery temperature, bimetal leaf 50 recovers undeformed state, and contact jaw 342 stretches into one end within shell 10 and reverts to electrical connection by disconnecting electrically connecting with the second lead-out tablet 24；Further, recovery temperature is less than deformation temperature.

More specifically, under the effect premise not having other external force, such as, on the premise of bimetal leaf 50 not deformation, contact jaw 342 is to stretch into the end thereof contacts within shell 10 with the second lead-out tablet 24 and be conductively connected；And in the case of having other External Force Actings, in the case of such as bimetal leaf 50 deformation, contact jaw 342 disconnection and the second lead-out tablet 24 can be driven to stretch into the electrical connection of the one end within shell 10；Meanwhile, when bimetal leaf 50 recovers shape, above-mentioned contact jaw 342 again can stretch into the end thereof contacts within shell 10 with the second lead-out tablet 24 and electrically connect again.Detailed description of the invention includes, as shown in Figure 1, second connection sheet 34 can be made the connection sheet with memory function or elastic force, can by contact jaw 342 under the operative condition not having external force, always against and contact and stretch on the one end within shell 10 at the second lead-out tablet 24；When bimetal leaf 50 deforms and contact jaw 342 is produced External Force Acting, the deformation of bimetal leaf 50 can drive contact jaw 342 to disconnect the electrical connection having the second lead-out tablet 24 to stretch into the one end within shell 10, simultaneously, when bimetal leaf 50 recovers normal condition, contact jaw 342 can return to again stretch into the end thereof contacts within shell 10 state electrically connected with the second lead-out tablet 24.

In an embodiment of the present utility model, above-mentioned fusing-off temperature is preferably 85-105 DEG C；Foregoing circuit protection element is commonly used in the protection circuit containing battery, or is directly used in the outfan of battery, for battery is carried out overheated or overcurrent protection；In the range of 85-105 DEG C, battery battery core be in one can safety limiting temperature, higher than this temperature, whole battery core is it is possible to be burned out or burn because temperature is too high；Accordingly, it would be desirable to when battery temperature reaches this temperature, timely disconnecting circuit protection element, disconnect the connection of battery and external circuit, to ensure the safe handling of battery, do not have extreme case.

And in another embodiment of the present utility model, described deformation temperature is 60-80 DEG C.Charge-discharge performance in view of battery, it is necessary to assure battery in certain suitable temperature ranges, could its efficiency for charge-discharge, and this temperature is exactly the deformation temperature of bimetal leaf 50, the most above-mentioned 60-80 DEG C.Time more than this scope, making circuit protecting element be disconnected by circuit by bimetal leaf 50, stop the discharge and recharge of battery, after temperature declines, bimetal leaf 50 recovers, and is again switched in circuit by battery, to ensure the efficiency for charge-discharge of battery.

More specifically, the recovery temperature of above-mentioned bimetal leaf 50 can be 30-45 DEG C.

For the ease of installing and ensure the performance of bimetal leaf 50, the bimetal leaf 50 of bimetal leaf 50 preferably dish in this utility model.

In an embodiment of the present utility model, with making described fusing end 322 stretch into, with described first lead-out tablet 22, the elastic force that the one end within described shell 10 disconnects on described a connecting piece 32.This preferred version was the most also mentioned, and is to, in the case of fuse part 40 is melted, utilize the effect of above-mentioned elastic force or memory function, fusing end 322 is bounced off the first lead-out tablet 22 and stretches into the one end within shell 10.

In order to ensure that a connecting piece 32 and second connects the break-make between sheet 34 not by interfering with each other, when such as the bimetal leaf 50 on the second connection sheet 34 works, electric arc can be produced, under the interference of electric arc, the misoperation of a connecting piece 32 may be caused, affect the service life of circuit protecting element or directly result in a connecting piece 32 and also disconnect circuit protecting element is scrapped, so 62 two different cavitys of the first cavity 60 and the second cavity will be arranged in shell 10, a connecting piece 32 is positioned at the first cavity 60, second connects sheet 34 is positioned at the second cavity 62, so, when any a connecting piece action, the impact that another one is connected sheet can be reduced as far as possible.Ensure that the temperature in two cavitys not by electric arc each other or causes because a side disconnects heating up being affected as far as possible, make each connect sheet can well induced cell or the temperature of its position in circuit, more preferably to realize the control to circuit more accurately.

In order to further save raw material, facilitate manufacturing process, in a preferred embodiment of the present utility model, the sheet metal of one integral type is arranged on shell 10 internal, this sheet metal can be considered as a connecting piece 32 and the second integral type connecting sheet 34 forms, now, for fusing end 322, the other end is contact jaw 342 in one end of this sheet metal, simultaneously, one section of sheet metal with fusing end 322 can be considered as a connecting piece 32, and one section of sheet metal with contact jaw 342 can be considered as the second connection sheet 34.

On the basis of integrated metal sheet, in order to avoid a connecting piece 32 be connected with second sheet 34 produce action time, can be to causing External force interference each other, the fixing device 70 for being fixed in shell 10 by the mid portion of sheet metal it is additionally provided with in shell 10, sheet metal in this fixing device 70 side is a connecting piece 32, and the sheet metal being positioned at opposite side is the second connection sheet 34.Be arranged such, although actually use integrated metal sheet, but sheet metal becomes two parts from the location segment of fixing device 70, i.e. a connecting piece 32 and second connects sheet 34, so, when a connecting piece 32 action, does not interferes with the second connection sheet 34；Meanwhile, when second connects sheet 34 action, also a connecting piece 32 will not be produced the effect of power.Avoid because of the action of a side, cause the situation of other side's misoperation to occur.

More specifically, based on reason mentioned above, fixing device 70 is divided into the first cavity 60 and the second cavity 62 by internal for shell 10, and a connecting piece 32 is positioned at the first cavity 60, and second connects sheet 34 is positioned at the second cavity 62.

Fixing device 70 between two cavitys, can be by completely isolated to the first cavity 60 and the second cavity 62, it is also possible to consistent in order to ensure the temperature of both sides, and leaves certain gap.This utility model is based on the consideration to electric arc influence, preferably by completely isolated for the cavity of both sides.

In an embodiment of the present utility model, above-mentioned fixing device 70 includes the first fixed part 72 extended by shell 10 bottom up, leaves gap between this first fixed part 72 and shell 10 top, and this inner space is for through above-mentioned integrated metal sheet.Will the mid portion of sheet metal clamp and be fixed between the first fixed part 72 and shell 10 top, it is to avoid another side is adversely affected by the action connecting sheet.

More specifically, above-mentioned shell 10 top down also extends the second fixed part 74, leaves gap between the first fixed part 72 and the second fixed part 74, for through above-mentioned integrated metal sheet.Clamp and fix the mid portion of above-mentioned integrated metal sheet between first fixed part 72 and the second fixed part 74.

The mid portion of above-mentioned integrated metal sheet, refers to be positioned at fusing end 322 and any position of contact jaw 342, and certainly, enough positions installing bimetal leaf 50 to be left in the side being positioned at contact jaw 342；For the particular location of this mid portion, in addition to meeting above-mentioned condition, this utility model does not do other and limits.

Above-mentioned integrated metal sheet is the facility in terms of the volume in view of circuit protecting element of the present utility model and installation making, and the one proposed is the most preferred embodiment.This does not represent and novel is limited only to this, as long as meet shell the 10, first lead-out tablet the 22, second lead-out tablet 24, a connecting piece 32, second connects sheet 34 and fuse part 40 and bimetal leaf 50 and the requirement of temperature, other embodiment is also feasible.Such as, a connecting piece 32 and the second connection sheet 34 are two parts being kept completely separate, it is also possible to realize above-mentioned effect and reach the effect above, in this utility model, being also feasible.

In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means that the specific features, structure, material or the feature that combine this embodiment or example description are contained at least one embodiment of the present utility model or example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in any one or more embodiments or example in an appropriate manner.

Although above it has been shown and described that embodiment of the present utility model, it is understandable that, above-described embodiment is exemplary, it is not intended that to restriction of the present utility model, above-described embodiment can be changed in the range of this utility model in the case of without departing from principle of the present utility model and objective, revises, replace and modification by those of ordinary skill in the art.

Claims (13)

1. a circuit protecting element, it is characterised in that include

Shell (10)；

First lead-out tablet (22), it is internal that described shell (10) is stretched in described first lead-out tablet (22) one end, and the other end extend out to shell (10) outward；

Second lead-out tablet (24), it is internal that described shell (10) is stretched in described second lead-out tablet (24) one end, and the other end extend out to shell (10) outward；

A connecting piece (32), it is internal that described a connecting piece (32) is positioned at described shell (10), described a connecting piece (32) includes fuse end (322) and the first connection end (324), and one end that described fusing end (322) stretches into described shell (10) internal with described first lead-out tablet (22) electrically connects；

Second connects sheet (34), described second connects sheet (34) is positioned at described shell (10) inside, described second connects sheet (34) includes that contact jaw (342) and second connects end (344), and described contact jaw (342) stretches into described second lead-out tablet (24) that the one end inside described shell (10) is mobilizable to be electrically connected；Described second connects end (344) is connected end (324) electrical connection with first；

Fuse part (40), described fuse part (40) is positioned at described fusing end (322) and described first lead-out tablet (22) stretches between one end that described shell (10) is internal, described fusing end (322) is stretched into the internal one end of described shell (10) and is connected by described fuse part (40) is fixing with described first lead-out tablet (22), and described fuse part (40) is used for fusing and disconnect described fusing end (322) when the temperature of fuse part (40) reaches fusing-off temperature and described first lead-out tablet (22) stretches into the electrical connection between one end that described shell (10) is internal；

Bimetal leaf (50), it is positioned at shell (10) internal, for deforming when the temperature of bimetal leaf (50) reaches deformation temperature and driving described contact jaw (342) to disconnect the electrical connection of the one end stretching into described shell (10) inside with described second lead-out tablet (24)；

Described fusing-off temperature is more than described deformation temperature.

Circuit protecting element the most according to claim 1, it is characterised in that described bimetal leaf (50) is arranged on the described second side connecting sheet (34).

Circuit protecting element the most according to claim 1; it is characterized in that; described mobilizable electrically connect as: when bimetal leaf (50) is in undeformed state, one end that contact jaw (342) stretches into described shell (10) internal with the second lead-out tablet (24) electrically connects；When the temperature of bimetal leaf (50) is more than or equal to deformation temperature, bimetal leaf (50) deforms, and one end disconnection driving contact jaw (342) to stretch into described shell (10) with the second lead-out tablet (24) internal electrically connects；When the temperature of bimetal leaf (50) is reduced to recovery temperature, bimetal leaf (50) recovers undeformed state, and contact jaw (342) stretches into the internal one end of shell (10) and reverts to electrically connect by disconnecting electrically connecting with the second lead-out tablet (24)；Described recovery temperature is less than described deformation temperature.

Circuit protecting element the most according to claim 1, it is characterised in that described fusing-off temperature is 85-105 DEG C.

Circuit protecting element the most according to claim 3, it is characterised in that described deformation temperature is 60-80 DEG C.

Circuit protecting element the most according to claim 3, it is characterised in that described recovery temperature is 30-45 DEG C.

Circuit protecting element the most according to claim 1, it is characterised in that with making described fusing end (322) and described first lead-out tablet (22) stretch into the elastic force that the internal one end of described shell (10) disconnects on described a connecting piece (32).

Circuit protecting element the most according to claim 1; it is characterized in that; being provided with the first cavity (60) and the second cavity (62) in described shell (10), described a connecting piece (32) is positioned at the first cavity (60), and described second connects sheet (34) is positioned at the second cavity (62).

9. according to the circuit protecting element described in claim 1-7 any one; it is characterized in that; it is the sheet metal of integral type that described a connecting piece (32) and second connects sheet (34), and one end of described sheet metal is fusing end (322), and the other end of described sheet metal is contact jaw (342).

Circuit protecting element the most according to claim 9; it is characterized in that; the fixing device (70) for being fixed on by the mid portion of described sheet metal in shell (10) it is provided with in described shell (10); the sheet metal being positioned at described fixing device (70) side is described a connecting piece (32), and the sheet metal being positioned at described fixing device (70) opposite side is described second connection sheet (34).

11. circuit protecting elements according to claim 10; it is characterized in that; described fixing device (70) is divided into the first cavity (60) and the second cavity (62) by internal for shell (10); described a connecting piece (32) is positioned at the first cavity (60), and described second connects sheet (34) is positioned at the second cavity (62).

12. according to the circuit protecting element described in claim 10 or 11; it is characterized in that; described fixing device (70) includes the first fixed part (72) extended by shell (10) bottom up, and the mid portion of described sheet metal clamps and is fixed between described first fixed part (72) and shell (10) top.

13. circuit protecting elements according to claim 12; it is characterized in that; described shell (10) top down extends the second fixed part (74), and the mid portion of described sheet metal clamps and is fixed between described first fixed part (72) and the second fixed part (74).