CN103617928A - Thin circuit protection device - Google Patents
Thin circuit protection device Download PDFInfo
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- CN103617928A CN103617928A CN201310703359.0A CN201310703359A CN103617928A CN 103617928 A CN103617928 A CN 103617928A CN 201310703359 A CN201310703359 A CN 201310703359A CN 103617928 A CN103617928 A CN 103617928A
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- metal insert
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Abstract
The invention relates to a thin circuit protection device which comprises a hollow cavity formed by an upper shell and a lower shell, a breakable circuit consisting of a movable electrode, a movable contact, a fixed contact and a fixed electrode which are connected in series with one another, a macromolecular PTC (positive temperature coefficient) element and a bimetallic strip, wherein the upper shell consists of an upper metal insert and an upper plastic piece; reinforcement ribs are arranged on the upper metal insert, and reinforcement ribs matched with the upper plastic piece are also arranged on the upper plastic piece; the lower shell consists of a lower metal insert with a lead-out end and a fixed contact and a lower plastic piece; two clamping slots are formed in the ends, which are close to the outer wall, of two sides of the lower plastic piece; three embedding hooks are respectively arranged on a frame defined by three adjacent side edges, which are connected with the lower plastic piece, of the lower metal insert; the lower metal insert is embedded into the lower plastic piece through the embedding hooks; two bent parts are arranged at the middle section of the movable electrode along the direction perpendicular to the plane of the movable electrode; during mounting, the bent parts extend into the clamping slots of the lower plastic piece to press against the outer wall. The structural intensity of the thin circuit protection device disclosed by the invention is enhanced, and the reliability of the use of a product is improved.
Description
Technical field
The present invention relates to circuit brake, especially a kind of slim circuit brake that simultaneously relates to bimetal leaf and PTC element.
Background technology
A kind of protection device that simultaneously comprises bimetal leaf and PTC element has been applied in electronic circuit protection.Protection device of the prior art contains a plastic shell conventionally, and is assemblied in the parts such as bimetal leaf in plastic shell, PTC element, contact.Due to the development trend of electron trade miniaturization day by day, slimming, circuit brake is also faced with identical requirement.Therefore, overall dimension, the structural design of each parts that circuit brake comprises are all restricted, and for example, due to the restriction of device gross thickness, the thickness of plastic-injection layer thickness, metal insert is all restricted.Therefore, a result of miniaturization, slimming is the decline that brings device architecture intensity, especially in some weak link, for example, the junction of metal insert and plastic cement.Thereby, in use, easily cause the destruction of device, reduce the reliability of product application.
Slim circuit brake in actual applications, along with miniaturization, the slimming of device, easily causes the structural strength of device not enough, and the destruction that causes device, reduces the reliability that product is applied.Especially in some weak link, for example anti-breaking capacity, the armed lever after the junction of metal insert and plastic cement, the slimming of PTC element is assemblied in anti-pull off strength in device etc.
The applicant's application has a kind of self-hold over-current protection device, publication number is CN102568958A, it comprise plastic casing, can minute deenergizing, PTC element, four parts of bimetallic element, described divided deenergizing is in series by movable electrode, moving contact, fixed contact and fixed electrode; The hollow cavity that described plastic casing forms is separated into two cavitys side by side, and a cavity places PTC element and another cavity is placed bimetal leaf; Described PTC element is that current-carrying type is installed, and deenergizing is in parallel with dividing; Described bimetal leaf is that non-current-carrying type is installed, and self is not connected into circuit, and for disjunction and conducting that can minute deenergizing provide actuating force, in normal operation, the parallel circuits that electric current is comprised of sound contact and PTC element flows through; When abnormal conditions occur, when bi-metal plate deformed, bring the displacement of movable electrode, thereby cut off, can divide deenergizing, when bi-metal plate deformed is recovered, the displacement of movable electrode recovery, thus can disjunction circuit turn-on; The normal temperature resistance of described PTC element be no less than 100 times can minute deenergizing resistance.
But when said structure carries out more small-sized, more slim change, structural strength is obviously inadequate.Therefore, be necessary original structure to improve.
In addition, the exit of movable electrode is connected in external circuit, is in use easily drawn out, and causes contact poor fit, and functional reliability reduces.
Summary of the invention
The object of the invention is to: a kind of slim circuit brake is provided, can provides overheated or overcurrent duplicate protection for circuit, and there is self-recovering function and reliable operation.
The object of the invention is achieved through the following technical solutions: a kind of slim circuit brake; comprise the hollow cavity that upper casing and lower casing form; by movable electrode, moving contact, fixed contact and fixed electrode divided deenergizing in series; polmer PTC elements and bimetal leaf; between described upper casing and lower casing, at least sequentially comprise fixed electrode, polmer PTC elements, bimetal leaf from bottom to top, with the movable electrode of exit and moving contact; described moving contact mates with fixed contact, wherein:
Described upper casing consists of upper metal insert and upper plastic parts, on described upper metal insert, has reinforcement, is also provided with reinforcement on upper plastic parts, supporting with the reinforcement on upper metal insert;
Described lower casing consists of the lower metal insert with exit and fixed contact and plastic cement lower casing, the described nearly outer wall end of lower plastic parts two side is provided with two draw-in grooves, on the shaped as frame that three adjacent side that described lower metal insert and lower plastic parts join surround, be respectively equipped with three embedding hooks, metal insert and plastic parts are halved together by embedding hook;
In described movable electrode stage casing, in movable electrode plane vertical direction, be provided with two bendings, during installation, described bending is stretched in the draw-in groove of lower plastic parts, is tight against outer wall, and this outer wall is supported the bending of movable electrode, prevents that it is drawn out.
According to the order of plastic cement lower casing, metal insert, polmer PTC elements, bimetal leaf, movable electrode and upper casing, install from bottom to top.
The present invention when realizing slimming and miniaturization, improved device because the mechanical strength that slimming and miniaturization bring is not enough, overcome in use easy destroyed problem of device, improved the reliability of device use.A kind ofly to comprise bimetal leaf and PTC element, can provide safety device overheated or overcurrent duplicate protection and that there is self-recovering function for circuit.A kind of this device can be used in electronic circuit protection especially in great current cell circuit protection, for example the battery of smart mobile phone, panel computer and notebook computer.
On such scheme basis, in order to improve non-deformability of the present invention, the reinforcement number of described upper metal insert is 2～6.
On such scheme basis, in described lower metal insert, the length of at least vertical with movable electrode length direction embedding hook is not more than 2/3 of lower this side edge length of metal insert.Facilitate winding displacement, and provide enough spaces for injection process.Article three, embedding hook all can be shorter than place side edge length.
On such scheme basis, the thickness of described polmer PTC elements (4) is 0.1～0.3mm.Compared with ceramic PTC element, compare, polmer PTC elements has better toughness, is made into after slim shape, still effective resistance to deformation.
The manufacture method that a kind of slim circuit brake is provided of the present invention, prepares respectively upper casing and lower casing, wherein,
Lower metal insert with exit and fixed contact is embedded after lower plastic parts, carry out injection moulding, three side embedding hooks on lower metal insert are embedded in the plastic cement of lower casing, a side leaves exit, makes lower casing;
Polmer PTC elements is fit into lower casing; on polmer PTC elements, place after bimetal leaf; with movable electrode, be covered on bimetal leaf; moving contact on movable electrode mates placement with the fixed contact on lower metal insert; bending on movable electrode simultaneously snaps in the draw-in groove of lower plastic parts; homonymy leaves exit, finally with the whole slim circuit brake of upper casing sealing.
When movable electroplax is subject to outside pulling force, two dogleg section of movable electrode are blocked by the outer wall of plastic casing, thereby, be difficult to be drawn out, guarantee the structural integrity of device.
Operation principle of the present invention is:
Under normal circumstances, the fixed contact on the moving contact on movable electrode and lower casing metal insert is in contact with one another, can disjunction circuit turn-on, form parallel circuits with high molecular PTC element, and the electric current of the device of flowing through simultaneously driven fixed contact and high molecular PTC element flows through.Simultaneously, due to the normal temperature resistance of high molecular PTC element be far longer than can minute deenergizing resistance, overwhelming majority electric current flows out by the exit of movable electrode, moving contact, fixed contact, lower metal insert successively, only has the electric current of small part to flow out through movable electrode, high molecular PTC element, lower metal insert;
When overcurrent or overheated generation, bimetal leaf generation buckling deformation, bimetal leaf contacts with movable electrode and the displacement vertically upward of the moving contact end that brings movable electrode, thereby moving contact and fixed contact are separated from each other, and the electric current of the device of flowing through all flows out through movable electrode, high molecular PTC element, lower metal insert successively.Now, polmer PTC elements can move rapidly and present high-impedance state and produce heat, maintains bimetal leaf and remains on inverted status, until fault is got rid of circuit conducting voluntarily.
Owing to having adopted technique scheme, the present invention has following advantage:
(1) when PTC component thickness only has 0.1～0.3mm, ceramic PTC is because its fragility is greatly very easily broken, and high molecular PTC has good toughness, very thin in the situation that, also fragmentation can not occur.Particularly the elastic force repeated action at bimetal leaf is subject under greater impact power both of these case on PTC element or in the anti-drop test of device, and device of the present invention has clear superiority;
(2) three side embedding hooks of lower metal insert embed plastic cement, have improved greatly the adhesion of metal insert and plastic parts, and the phenomenon of throwing off in use can not occur;
(3) metal insert in plastic cement upper casing comprises reinforcement, and when device pressurized, non-deformability strengthens;
(4) exit of movable electrode is connected in external circuit, is in use easily drawn out, and causes contact poor fit, is one of main intensity risk of facing of device.By the cooperation of bending and draw-in groove, significantly increased the resistance that movable electrode is drawn out, improved reliability.
Therefore, compared with prior art, structural strength integral body of the present invention is enhanced, and improves the reliability that product is used.
Accompanying drawing explanation
Fig. 1 is STRUCTURE DECOMPOSITION schematic diagram of the present invention;
Fig. 2 is upper metal insert schematic diagram;
Fig. 3 is the upper casing schematic diagram that contains metal insert;
Fig. 4 is movable electrode schematic diagram;
Fig. 5 is lower metal insert schematic diagram;
Fig. 6 is the lower casing vertical view that contains lower metal insert;
Fig. 7 is the lower casing schematic side view that contains lower metal insert;
Fig. 8 is the draw-in groove schematic diagram matching with two bendings of movable electrode in lower casing;
Fig. 9 is the schematic diagram that coordinates of two bendings and draw-in groove in movable electrode.
Attached number in the figure explanation:
1---upper casing;
11---upper metal insert; 111,112,113,114---upper metal insert reinforcement;
12---upper plastic parts; 121,122,123,124---upper plastic parts reinforcement;
2---movable electrode;
21---movable electrode exit; 221,222---left and right bending; 23---moving contact;
3---lower casing;
31---lower metal insert; 311---lower metal insert exit;
32---lower plastic parts;
331,332,333---embedding hook;
341,342---left and right draw-in groove;
35---fixed contact; 36---outer wall;
4---polmer PTC elements; 5---bimetal leaf.
Embodiment
Below in conjunction with Figure of description, the present invention is further described.
If Fig. 1 is as shown in STRUCTURE DECOMPOSITION schematic diagram of the present invention; a kind of slim circuit brake; comprise the hollow cavity that upper casing 1 and lower casing 3 form; by movable electrode 2, moving contact 23, fixed contact 35 and fixed electrode divided deenergizing in series; polmer PTC elements 4 and bimetal leaf 5; between described upper casing 1 and lower casing 3, at least sequentially comprise fixed electrode, polmer PTC elements 4, bimetal leaf 5 from bottom to top, with the movable electrode 2 of exit 21 and moving contact 23; described moving contact 23 mates with fixed contact, wherein:
If Fig. 2 is that upper metal insert schematic diagram and Fig. 3 are as shown in the upper casing schematic diagram that contains upper metal insert, described upper casing 1 consists of upper metal insert 11 and upper plastic parts 12, in order to improve non-deformability of the present invention, on described upper metal insert 11, there are four upper metal insert reinforcements 111,112,113,114, on described upper plastic parts 12, be also provided with and four upper plastic parts reinforcements 121,122,123,124, mate socket with upper metal insert reinforcement 111,112,113,114;
If Fig. 5 is lower metal insert schematic diagram, Fig. 6 is that lower casing vertical view and Fig. 7 of containing lower metal insert are shown in the lower casing schematic side view that contains lower metal insert, described lower casing 3 consists of the lower metal insert 31 and the lower plastic parts 32 that are provided with the lower metal insert exit 311 of band and fixed contact 35, described nearly outer wall 36 ends of lower plastic parts 32 2 side are provided with left and right draw-in groove 341, 342, on the shaped as frame that three adjacent side that described lower metal insert 31 and lower plastic parts 32 join surround, be respectively equipped with three embedding hooks 331, 332, 333, lower metal insert 31 and lower plastic parts 32 are by embedding hook 331, 332, 333 are halved together, as Fig. 6, in described lower metal insert 31, the length of at least vertical with movable electrode 2 length directions embedding hook 333 is not more than 2/3 of lower metal insert 31 these side edge length.And the length of the left and right embedding hook 331,332 of its two side is identical with place edge lengths, its object is to leave space, and for the present invention, in use issuable winding displacement, injection process leave space;
If Fig. 4 is as shown in movable electrode schematic diagram, in described movable electrode 2 stage casings, in movable electrode 2 plane vertical direction, set up left and right bending 221,222 separately, during installation, described left and right bending 221,222 is stretched in the left and right draw-in groove 341,342 of lower plastic parts 32, be tight against outer wall 36, this outer wall 36 is supported the left and right bending 221,222 of movable electrode, prevents that movable electrode 2 is drawn out.
When upper casing bears pressure, can cause the distortion of upper casing, thereby have influence on the matching relationship of device inside part, cause device fault.Common in order to strengthen the non-deformability of upper casing, in upper casing, use a metal insert to strengthen.The present invention is on this basis, by setting up reinforcement 13, has further strengthened this humidification, has effectively improved the non-deformability of device.
Fig. 8 is that the draw-in groove schematic diagram that matches with two bendings of movable electrode in lower casing and Fig. 9 are the coordinating shown in schematic diagram of two bendings and draw-in groove in movable electrode, in use, movable electrode exit 21 and lower metal insert exit 311 are connected in external circuit in the present invention.Therefore, the movable electrode exit 21 of both sides and lower metal insert exit 311 can be subject to pulling force in various degree in actual use.The problem causing therefrom, the bending structure of movable electrode of the present invention designs and supports with the buckle of housing, can effectively avoid movable electrode 2 to be drawn out from shell, guarantees that device is not damaged.
As shown in Figure 9, in movable electrode 2, contain left and right bending 221,222, in lower casing 3, be provided with the left and right draw-in groove 341,342 matching with 2 two bendings of movable electrode simultaneously.After device assembling, left and right bending 221,222 in movable electrode 2 forms and coordinates with left and right draw-in groove 341,342, when movable electrode 2 is subject to outside pulling force, the left and right bending 221,222 of movable electrode 2 is blocked by the outer wall 36 of lower casing 3, be difficult to be drawn out, prevent that device lost efficacy because dynamic and static contact misplaces.
On such scheme basis, the thickness of described polmer PTC elements is 0.1～0.3mm.Compared with ceramic PTC element, compare, polmer PTC elements has better toughness, be made into laminar after, effective resistance to deformation still.
Installation method of the present invention is:
Prepare respectively upper casing 1 and lower casing 3, wherein:
The lower metal insert of the lower metal insert exit 311 of band and fixed contact 35 is embedded after lower plastic parts, carry out injection moulding, three side embedding hooks 331,332,333 on lower metal insert 31 are embedded in the plastic cement of lower casing, a side leaves exit, makes lower casing 3;
The present embodiment is under normal service condition, moving contact 23 on movable electrode 2 is in contact with one another with the fixed contact 311 on lower casing metal insert 31, can disjunction circuit turn-on, form parallel circuits with polmer PTC elements 4, driven fixed contact 23 of electric current while and the polmer PTC elements 4 of the device of flowing through flow through.Simultaneously, due to the normal temperature resistance of polmer PTC elements 4 be far longer than can minute deenergizing resistance, the overwhelming majority of electric current is passed through successively movable electrode 2, moving contact 23, fixed contact 35, from lower metal insert exit 311, is flowed out, and only has the electric current of small part to flow out through movable electrode 2, polmer PTC elements 4, lower metal insert 31.When overcurrent or overheated generation, there is buckling deformation in bimetal leaf 5, bimetal leaf 5 contacts with movable electrode 2 and the displacement vertically upward of moving contact 23 ends that bring movable electrode 2, thereby moving contact 23 and fixed contact 35 are separated from each other, and the whole of the electric current of the device of flowing through are flowed out through movable electrode 2, polmer PTC elements 4, lower metal insert 31 successively.Now, polmer PTC elements 4 can move rapidly and present high-impedance state and produce heat, maintains bimetal leaf 5 and remains on inverted status, until fault is got rid of circuit conducting voluntarily.
Instantly three side embedding hooks 331,332,333 of metal insert 31 in the present invention, after injection moulding is complete, embedding hook 331,332,333 is embedded in plastic parts 32, as shown in Figure 7.Thereby the bond strength of lower metal insert 31 and lower plastic parts 32 is enhanced.When bimetal leaf 5 reversion, its elastic force passing over is difficult to cause the disengagement of lower casing metal insert 31 and plastic parts 32.
On such scheme basis, when using ceramic PTC, because its fragility is large, very easily broken under ultra-thin shape.And high molecular PTC has good toughness, very thin in the situation that, can there is not fragmentation yet.Particularly for the requirement of device operation principle, the elastic force of bimetal leaf 5 can repeated action on PTC element, device can bear various external impact force in actual use simultaneously, for example, simulated battery is impulsive force during kiss the earth when highly falling.
The present invention compared with prior art, can further prove superiority of the present invention by following experimental data:
(1) by the lower casing according to mentioning in the present invention, and lower metal insert three sides do not have embedding hook to embed the lower casing of plastic cement, withstand on the lower metal insert at the circular hole place in plastic frame body with thimble, exert pressure until metal insert is deviate from from plastic cement.The bond strength of test metal insert and plastic cement.Test data is as follows:
(2) by the shell according to mentioning in the present invention and movable electrode assembly, and movable electrode does not contain the assembly of draw-in groove containing bending, lower casing, with puller system, assembly both sides terminal is applied to pulling force, until movable electrode is deviate from from plastic cement, test tension intensity.Test data is as follows:
(3) will contain the polmer PTC elements of mentioning in the present invention, and contain same size ceramic PTC element.Device is contained under the weight of 200g, from 2m height freely falling body, to cement flooring, impacts 100 times.The shock resistance breaking capacity of observing CPTC, test data is as follows:
(4) by the upper casing according to mentioning in the present invention, and the upper casing of containing metal reinforcement not, with thimble, upper casing is applied to 150N pressure, observe the resistance to compression deformability of upper casing.Test data is as follows:
。
Claims (5)
1. a slim circuit brake; comprise the hollow cavity that upper casing and lower casing form; by movable electrode, moving contact, fixed contact and fixed electrode divided deenergizing in series; polmer PTC elements and bimetal leaf; between described upper casing and lower casing, at least sequentially comprise fixed electrode, polmer PTC elements, bimetal leaf from bottom to top, with the movable electrode of exit and moving contact; described moving contact mates with fixed contact, it is characterized in that:
Described upper casing consists of upper metal insert and upper plastic parts, on described upper metal insert, has reinforcement, on described upper plastic parts, is also provided with reinforcement, supporting with the reinforcement on upper metal insert;
Described lower casing consists of the lower metal insert and the lower plastic parts that are provided with exit and fixed contact, the described nearly outer wall end of lower plastic parts two side is provided with two draw-in grooves, on the shaped as frame that three adjacent side that described lower metal insert and lower plastic parts join surround, be respectively equipped with three embedding hooks, metal insert and lower plastic parts are halved together by embedding hook;
In described movable electrode stage casing, in movable electrode plane vertical direction, be provided with two bendings, during installation, described bending is stretched in the draw-in groove of lower plastic parts, is tight against outer wall.
2. slim circuit brake according to claim 1, is characterized in that: the reinforcement number of described upper metal insert is 2～6.
3. slim circuit brake according to claim 1, is characterized in that: in described lower metal insert, the length of at least vertical with movable electrode length direction embedding hook is not more than 2/3 of lower this side edge length of metal insert.
4. slim circuit brake according to claim 1, is characterized in that: the thickness of described polmer PTC elements is 0.1～0.3mm.
5. according to the manufacture method of the slim circuit brake described in any one of claim 1 to 4, comprise the steps:
Prepare respectively upper casing and lower casing, wherein,
The lower metal insert of the lower exit of band and fixed contact is embedded after lower plastic parts, carry out injection moulding, three side embedding hooks on lower metal insert are embedded in the plastic cement of lower casing, a side leaves exit, makes lower casing;
Polmer PTC elements is fit into lower casing; on polmer PTC elements, place after bimetal leaf; with movable electrode, be covered on bimetal leaf; moving contact on movable electrode mates placement with the fixed contact on lower metal insert; bending on movable electrode simultaneously snaps in the draw-in groove of lower plastic parts; homonymy leaves exit, finally with the whole slim circuit brake of upper casing sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310703359.0A CN103617928A (en) | 2013-12-19 | 2013-12-19 | Thin circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310703359.0A CN103617928A (en) | 2013-12-19 | 2013-12-19 | Thin circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103617928A true CN103617928A (en) | 2014-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310703359.0A Pending CN103617928A (en) | 2013-12-19 | 2013-12-19 | Thin circuit protection device |
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| Country | Link |
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| CN (1) | CN103617928A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104752114A (en) * | 2015-04-21 | 2015-07-01 | 姚家米 | Overcurrent, overload and overheat protector |
| CN106992103A (en) * | 2016-01-21 | 2017-07-28 | 瑞侃电子(上海)有限公司 | Thermal circuit beraker |
| US11145944B2 (en) * | 2018-02-05 | 2021-10-12 | Ningde Amperex Technology Limited | Protection device and battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1282089A (en) * | 1999-07-22 | 2001-01-31 | 打矢恒温器株式会社 | Heat Protector |
| CN1604259A (en) * | 2003-09-30 | 2005-04-06 | 阿尔卑斯电气株式会社 | Thermal response switch |
| CN101770896A (en) * | 2009-12-31 | 2010-07-07 | 上海长园维安电子线路保护股份有限公司 | Thin-type temperature-sensing action element |
| CN102568958A (en) * | 2011-12-31 | 2012-07-11 | 上海长园维安电子线路保护股份有限公司 | Self-hold over-current protection device |
-
2013
- 2013-12-19 CN CN201310703359.0A patent/CN103617928A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1282089A (en) * | 1999-07-22 | 2001-01-31 | 打矢恒温器株式会社 | Heat Protector |
| CN1604259A (en) * | 2003-09-30 | 2005-04-06 | 阿尔卑斯电气株式会社 | Thermal response switch |
| CN101770896A (en) * | 2009-12-31 | 2010-07-07 | 上海长园维安电子线路保护股份有限公司 | Thin-type temperature-sensing action element |
| CN102568958A (en) * | 2011-12-31 | 2012-07-11 | 上海长园维安电子线路保护股份有限公司 | Self-hold over-current protection device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104752114A (en) * | 2015-04-21 | 2015-07-01 | 姚家米 | Overcurrent, overload and overheat protector |
| CN106992103A (en) * | 2016-01-21 | 2017-07-28 | 瑞侃电子(上海)有限公司 | Thermal circuit beraker |
| US11145944B2 (en) * | 2018-02-05 | 2021-10-12 | Ningde Amperex Technology Limited | Protection device and battery |
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Application publication date: 20140305 |