CN208173540U - A kind of Thermal Cutoffs with arc-extinguishing medium - Google Patents
A kind of Thermal Cutoffs with arc-extinguishing medium Download PDFInfo
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- CN208173540U CN208173540U CN201820384794.XU CN201820384794U CN208173540U CN 208173540 U CN208173540 U CN 208173540U CN 201820384794 U CN201820384794 U CN 201820384794U CN 208173540 U CN208173540 U CN 208173540U
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Abstract
The utility model provides a kind of Thermal Cutoffs with arc-extinguishing medium comprising shell, surface are coated with low-melting alloy, insulating layer and the conductor of fluxing disconnected agent；Conductor is connected to the both ends of low-melting alloy, and as exit, insulating layer is coated on outside the fluxing disconnected agent, is sealed to fluxing disconnected agent；Thermal Cutoffs further includes seal, for being blocked；In the chamber that shell, insulating layer and seal are formed, it is filled with arc-extinguishing medium.Protective effect can be effectively performed in high-power, high voltage or the circuit of high current in the Thermal Cutoffs of the utility model, without generating unsafe phenomenons such as shell puncture, rupture, be more suitable for modern circuits, safe and reliable.
Description
Technical field
The utility model relates to a kind of Thermal Cutoffs, in particular to a kind of Thermal Cutoffs with arc-extinguishing medium.
Background technique
Thermal Cutoffs is as a kind of over-temperature protection element, and using low-melting alloy link circuit, low-melting alloy is molten
Point is lower than 232 DEG C of alloy, is usually made of metallic elements such as Bi, Sn, Pb, In.It is wrapped in around low-melting alloy fluxing
Disconnected agent, low-melting alloy is connect with metallic laminas, and is sealed by insulating materials.It is wrapped in the low-melting alloy of fluxing disconnected agent
Characteristic be it is temperature sensitive, when temperature reaches the softening point of fluxing disconnected agent, can remove low-melting alloy surface oxide layer, and have
Some tension force effects can be such that low-melting alloy shrinks to two sides metallic laminas, thus the circuit that cutting is connected.
When the power component protected is due to overheating, the Thermal Cutoffs for being close to power component will be quick
Fusing generates the life incident of injury so that the circuit of rupturing duty component, prevents thermal runaway.
But disjunction voltage possessed by ordinary temperature fuse is exchange 250Vac, direct current 60Vdc, is unable to satisfy and increasingly increases
The long market demand, the power demand of DC heater is in 1800W or more at present, and voltage is in 320Vdc or more.
Utility model content
In order to solve the above-mentioned existing problems, the purpose of this utility model is to provide a kind of, and the temperature with arc-extinguishing medium is protected
Protective effect can be effectively performed in high-power, high voltage or the circuit of high current in dangerous silk.
The purpose of this utility model is realized by following technical proposal：
A kind of Thermal Cutoffs with arc-extinguishing medium comprising the low melting point that shell, surface are coated with fluxing disconnected agent is closed
Gold, insulating layer and conductor；Conductor is connected to the both ends of low-melting alloy, and as exit, insulating layer is coated on outside fluxing disconnected agent
It is sealed；Thermal Cutoffs further includes seal, for being blocked；It is formed in shell, insulating layer and seal
In chamber, it is filled with arc-extinguishing medium.
The Thermal Cutoffs of the utility model can be used for the protection of DC heater, when the DC heater protected due to
Control device can not disconnect heating circuit, when temperature is increased to the softening point of fluxing disconnected agent, the activity removal eutectic of fluxing disconnected agent
The oxide layer of point alloy surface, when temperature is increased to the fusing point of low-melting alloy, liquefied fluxing disconnected agent has surface tension,
Under fluxing disconnected agent tension force effect, low-melting alloy can be shunk to two sides, and when disjunction is higher than 48V circuit, cut-off point is necessarily produced
Raw electric arc, the generation of electric arc can make fluxing disconnected agent transient evaporation, and cause insulating layer rupture, carbonization, the arc-extinguishing medium in chamber
Absorbable gasification impact.The contact of arc-extinguishing medium large area is conducive to absorb the energy of electric arc, electric arc can be allowed to be quickly cooled down, absolutely
After edge layer disappears, arc-extinguishing medium moment fills electric arc conductive path, and breaking arc is effectively disconnected from circuit, to cut off heating
The circuit of device, prevents thermal runaway, and circuit safety is effectively protected.
Further, arc-extinguishing medium is quartz sand, arc extinguishing cream or insulating oil.Wherein preferred quartz sand, because quartz sand has
Higher thermal conductivity and insulating properties, be more advantageous to arc extinguishing.
Further, more parallel connections of low-melting alloy.
Further, wherein the fusing point of a low-melting alloy is higher than the fusing point of other low-melting alloys, and it is straight
Diameter is less than the diameter of other low-melting alloys.
Further, insulating layer is UV glue, epoxy resin or the hyaline-quartz pipe or ceramic tube sealed with seal.
Further, shell is thermoplastic material, thermosetting material, ceramics, hyaline-quartz pipe or fiberglass pipe.
Further, low-melting alloy is Filamentous or sheet.
Further, the axially opposing extraction of conductor, or draw in the same direction.
Further, Thermal Cutoffs further includes locating piece, and conductor is stretched out across the locating piece.
Further, shell is provided with location hole, and conductor is drawn from the location hole.
The beneficial effects of the utility model：
Guarantor can be effectively performed in high-power, high voltage or the circuit of high current in the Thermal Cutoffs of the utility model
Shield effect is more suitable for modern circuits without generating unsafe phenomenons such as shell puncture, rupture, safe and reliable.
Detailed description of the invention
The utility model is further described below in conjunction with following drawings, wherein：
Fig. 1 is the axialmode Thermal Cutoffs sectional view with quartz sand of the utility model；
Fig. 2 is the type Thermal Cutoffs sectional view in the same direction with quartz sand of the utility model；
Fig. 3 is the Thermal Cutoffs section of the more low-melting alloy parallel connections of the axialmode with quartz sand of the utility model
Figure；
Fig. 4 is the Thermal Cutoffs section of the more low-melting alloy parallel connections of type in the same direction with quartz sand of the utility model
Figure.
Fig. 5 is the Thermal Cutoffs sectional view that the axialmode with quartz sand of the utility model is centered about；
Fig. 6 is the Thermal Cutoffs sectional view that the type in the same direction with quartz sand of the utility model is centered about；
Fig. 7 is the tubular shell that the axialmode with quartz sand of the utility model is centered about；
Fig. 8 is the square shell that the type in the same direction with quartz sand of the utility model is centered about.
Specific embodiment
The utility model is specifically described with reference to the accompanying drawing.
Embodiment 1
Thermal Cutoffs as shown in Figure 1, in the airtight chamber that tubular shell 101 and sealing compound 102 are constituted, if
There is surface to be coated with the low-melting alloy 103 of fluxing disconnected agent 104, low-melting alloy 104 is filiform, and both ends are respectively connected with left pin
107, right pin 108.It is axial to pass through sealing compound 102 for left pin 107 and distal end of the right pin 108 relative to low-melting alloy 104
It is opposite to draw.The outer layer covers of fluxing disconnected agent 104 have a layer insulating 105, for sealing fluxing disconnected agent.Insulating layer 105 with
Quartz sand 106 is filled in the chamber that shell 101, sealing compound 102 are constituted.
Fluxing disconnected agent 104 can remove the surface oxide layer of low-melting alloy 103, and have tension force effect, close low melting point
Gold 103 is shunk to the left and right pin in two sides, thus the circuit that cutting is connected.The setting of insulating layer 106 can prevent fluxing disconnected agent
104, in softening, penetrate into quartz sand 106, fluxing disconnected agent 104 are caused not contact with low-melting alloy 103 effectively, and
Low-melting alloy 103 can be prevented in softening, surface layer is destroyed by quartz sand 106, causes low-melting alloy 103 when shrinking, by
In the presence of residual alloy, electric clearance becomes smaller, and punch-through occurs.
Insulating layer 106 is set as with the film layer expanded with heat and contract with cold.In protection temperature range, insulating layer 106 can be according to helping
Contraction, degrees of expansion when fusing agent 104 is heated correspondingly are shunk, are expanded.Prevent fluxing disconnected agent 104 from generating due to heated
Deformation burst insulating layer 106, lead to fluxing 103 overflow of disconnected agent.
The place that left pin 107, right pin 108 are contacted with sealing compound 102, which is provided with, flattens position, can increase Temperature protection
The pulling capacity and anti-torsion ability of silk pin.
Thermal Cutoffs can be used for the protection of lithium ion battery, when the inside lithium ion cell protected or external generation are short
Lu Shi, excessively high short circuit current can make 103 self-heating of low-melting alloy, rapid cut-off loop.If short circuit current is not enough to
Low-melting alloy 103 is promoted to cut off rapidly, since the short circuit of lithium ion battery can cause own temperature to rise, when temperature is increased to
When the softening point of fluxing disconnected agent 104, fluxing disconnected agent 104 can remove the surface oxide layer of low-melting alloy 103, when constant temperature body
Up to the fusing point of low-melting alloy 103 when, under fluxing disconnected 104 tension force effect of agent, pin two to left and right of low-melting alloy 103
Side is shunk, and in disjunction, necessarily leads to electric arc, the generation of electric arc can make fluxing 104 transient evaporation of disconnected agent, and cause insulating layer
105 ruptures are carbonized, and the absorbable gasification impact of the quartz sand 106 in chamber, quartz sand 106 has higher thermal conductivity and insulation
Property.The contact of electric arc and 106 large area of quartz sand is conducive to the energy for absorbing electric arc, electric arc can be allowed to be quickly cooled down, insulating layer
After 105 disappear, 106 moment of quartz sand fills electric arc conductive path, and breaking arc is effectively disconnected from circuit, makes to be close to battery core
Thermal Cutoffs quick fuse prevent battery explosion to cut off the external circuit of battery, be effectively protected circuit safety.
The test data of Thermal Cutoffs and ordinary temperature fuse in the present embodiment is listed in following table 1 to compare
(10A/400Vdc specification carries out 1.5I according to 10.6 clauses of IEC60691 standardr、1.1UrTest).
Table 1
Embodiment 2
As shown in Fig. 2, it is low to be equipped with one in the airtight chamber that rectangular or barrel-shaped shell 201 and sealing compound 202 are constituted
Melting alloy 203, the external sheath of low-melting alloy 203 help fusing agent 204, and the both ends of low-melting alloy 203 are respectively provided with a left side
Pin 207, right pin 208, are electrically connected with it, distal end of the left and right pin relative to low-melting alloy 203, pass through sealing compound
202 draw in the same direction, and the position that left and right pin is contacted with sealing compound 202, which is respectively provided with, flattens position, reinforce left and right pin and sealing
The binding force of glue 202.The external sheath of fluxing disconnected agent 204 has a layer insulating 205, in insulating layer 205 and shell 201, sealing
In the chamber that glue 202 is constituted, it is filled with quartz sand 206.
Thermal Cutoffs can be used for the overheat protector of heater, directly be series at heating major loop.If switch member occurs
Mechanical contact is extremely sticky, and heater can not close in time, so that constant temperature rises, when temperature is increased to fluxing disconnected agent 204
Softening point when, the surface oxide layer of the removable low-melting alloy 203 of fluxing disconnected agent 204, when constant temperature rises to eutectic
When the fusing point of point alloy 203, fluxing disconnected agent 204 is in a liquid state, and has surface tension, promote low-melting alloy 203 it is left to two sides,
Right pin is shunk, and when shrinking cutting, necessarily leads to electric arc, electric arc promotes fluxing 204 transient evaporation of disconnected agent, and causes insulating layer
205 ruptures are carbonized, and the absorbable gasification impact of the quartz sand 206 in chamber, quartz sand 206 has higher thermal conductivity and insulation
Property.The contact of electric arc and 206 large area of quartz sand, quartz sand 206 are conducive to absorb the energy of electric arc, can allow the fast quickly cooling of electric arc
But, after insulating layer 205 disappears, 206 moment of quartz sand fills electric arc conductive path, and breaking arc is effectively disconnected from heating circuit,
The safety of protective loop.
Embodiment 3
When applying to the occasion higher than 15A, excessively thick low-melting alloy will affect its contraction speed, to influence point of electric arc
Low-melting alloy can be carried out more parallel connections to meet through-flow demand by cutting capacity.
As shown in figure 3, being closed in hermetic type the first low melting point of intracavitary setting that tubular shell 301 and sealing compound 302 are constituted
Golden component 303, the second low-melting alloy component 304, third low-melting alloy component 305, wherein the first low-melting alloy component
303, the second low-melting alloy component 304, third low-melting alloy component 305 respectively include low-melting alloy, be coated on it is low
The fluxing disconnected agent of melting alloy outer layer, the insulating layer being coated on outside fluxing disconnected agent.First, second and third low-melting alloy component is with a left side
The axle center of pin 309 and right pin 310 is that axis equal part in center is spaced apart, the both ends of the first, second and third low-melting alloy component
It is respectively connected to left end cap 307, right end cap 308, forms the three low-melting alloys parallel connections of the first, second and third low-melting alloy component
Structure.Left end cap 307 is connected to left pin 309, and right end cap 308 is connected to right pin 310, and left and right pin is each passed through sealing
The axially opposing extraction of glue 302.It is constituted in the insulating layer of the first, second and third low-melting alloy component with shell 301, sealing compound 302
Chamber in be filled with quartz sand 306.
In the range of certain low-melting alloy length, low-melting alloy is thinner, is more advantageous to the contraction of low-melting alloy.
According to the difference of breaking capacity size, the diameter of the low-melting alloy of the first low-melting alloy component 303 can be arranged less than the
The diameter of the low-melting alloy of two low-melting alloy components 304 and third low-melting alloy component 305, and the first low-melting alloy
The fusing point of the low-melting alloy 303 of component 303 is higher than the second low-melting alloy component 304 and third low-melting alloy component 305
Low-melting alloy fusing point, the low-melting alloy of the second low-melting alloy component 304 and third low-melting alloy component 305
Fusing point is consistent.
In the overheat protector for applying to high current, when temperature rises to the softening temperature of fluxing disconnected agent, fluxing disconnected agent
The oxide layer that can remove low-melting alloy surface, when constant temperature rises to the second low-melting alloy component 304 and third eutectic
When the fusing point of the low-melting alloy of point alloy component 305, liquefied fluxing disconnected agent has surface tension, second and third low melting point is closed
The low-melting alloy of golden component under the surface tension effects of fluxing disconnected agent, shunk to the left end caps 307 of two sides, right end cap 308,
Fusing, when temperature rises to the fusing point of the low-melting alloy of the first low-melting alloy component 303, second and third low melting point at this time
The low-melting alloy of alloy component is shunk completely, and the low-melting alloy of the first low-melting alloy component 303 is in electric current and temperature
It spends under double influence and under the surface tension effects of fluxing disconnected agent, rapid desufflation, disjunction, between the low-melting alloy of disjunction at this time
Electric arc is generated, moment makes fluxing disconnected agent gasification, causes rupture, the carbonization of insulating layer, directly make electric arc and 306 large area of quartz sand
Contact, quartz sand 306 is conducive to absorb the energy of electric arc, electric arc can be allowed to be quickly cooled down, after insulating layer disappears, quartz sand 306
Moment fills electric arc conductive path, and breaking arc is effectively disconnected from heating circuit, the safety of protective loop.
Embodiment 4
As shown in figure 4, in the intracavitary setting first of hermetic type that rectangular or barrel-shaped shell 401 and sealing compound 402 are constituted
Low-melting alloy component 410 and the second low-melting alloy component 420, wherein the first low-melting alloy component 410 includes low melting point
Alloy 403, the fluxing disconnected agent 404 for being coated on low-melting alloy surface, the insulating layer 405 for being coated on fluxing disconnected agent surface, second
Low-melting alloy component 420 also includes low-melting alloy, is coated on low-melting alloy surface fluxing disconnected agent, be coated on it is fluxing disconnected
The insulating layer on agent surface.The both ends of low-melting alloy are respectively connected to left pin 407, right pin 408, form the first and second low melting point
The structure of two low-melting alloy parallel connections of alloy component, wherein the first and second low-melting alloy component 410,420 is spaced apart.Left,
Right pin 407,408 is each passed through sealing compound 402 and draws in the same direction.In the insulating layer of the first and second low-melting alloy component 410,420
Quartz sand 406 is filled in the chamber constituted with shell 401, sealing compound 402.
According to the difference of breaking capacity size, the diameter of the low-melting alloy of the first low-melting alloy component 410 can be set
Set the diameter of the low-melting alloy less than the second low-melting alloy component 420, and the low melting point of the first low-melting alloy component 410
The fusing point of alloy is higher than the fusing point of the low-melting alloy of the second low-melting alloy component 420.
In the overheat protector for applying to high current, when temperature rises to the softening temperature of fluxing disconnected agent, fluxing disconnected agent
The oxide layer that can remove low-melting alloy surface, when constant temperature rises the low-melting alloy of the second low-melting alloy component 420
Fusing point when, liquefied fluxing disconnected agent has surface tension, and the low-melting alloy of the second low-melting alloy component 420 is fluxing disconnected
Under the surface tension effects of agent, is shunk to left pin 407, the right pin 408 of two sides, fusing, rise to the first eutectic to temperature
When the fusing point of 410 low-melting alloys 403 of point alloy component, the low-melting alloy of the second low-melting alloy component 420 at this time
It shrinks completely, the low-melting alloy 403 of the first low-melting alloy component 410 is under electric current and temperature double influence and fluxing
Under the surface tension effects of disconnected agent 404, rapid desufflation, disjunction generate electric arc between the low-melting alloy of disjunction at this time, and moment makes to help
Fuse agent gasification, causes rupture, the carbonization of insulating layer, comes into contact in a large area electric arc with quartz sand 406, quartz sand 406 has
Conducive to the energy for absorbing electric arc, electric arc can be allowed to be quickly cooled down, after insulating layer disappears, it is conductive that 406 moment of quartz sand fills electric arc
Path, breaking arc are effectively disconnected from heating circuit, the safety of protective loop.
Embodiment 5
To guarantee that low-melting alloy is fully wrapped around by quartz sand, locating piece placed in the middle can be added, guarantees that low-melting alloy exists
When contraction, disjunction, electric arc can come into contact in a large area with quartz sand, absorb the energy of electric arc.
As shown in figure 5, the mode that left pin 507, right pin 508 can be molded in advance, by the injection molding of left locating piece 509 in
On left pin 507, right locating piece 510 is molded on right pin 508, the junction of left and right pin and left and right locating piece can
Preparatory annular knurl is flattened, and can increase binding force by injection molding.By the setting of left and right locating piece, make left and right pin and shell
501 coaxially and in center, and low-melting alloy 503 is welded between left and right pin, and the surface cladding of low-melting alloy 503 helps
Fuse agent 504, and the external sheath of fluxing disconnected agent 504 has an insulating layer 505, in insulating layer 505, left locating piece 509, right locating piece
510, the sealing two ends for being filled with quartz sand 506 in the chamber that shell 501 is constituted, and thering is sealing compound 502 to carry out shell 501.
For convenience of process manufacture, the setting of wherein one end locating piece can be cancelled, directly sealed by sealing compound.
Embodiment 6
As shown in fig. 6, left pin 607, right pin 608 can first pass through the mode of injection molding in advance, by the injection molding of locating piece 609 in
On left and right pin, ensure that left and right pin positioning 609 it is placed in the middle, be spaced apart.And low-melting alloy 603 is welded in
On one end of left and right pin, the electrical connection of left pin 607, low-melting alloy 603, right pin 608 is formed, is closed in low melting point
The surface of gold 603 coats one layer of fluxing disconnected agent 604, in one layer insulating 605 of external sheath of fluxing disconnected agent 604, by this component
It is inserted in the shell 601 equipped with quartz sand 606, so that quartz sand 606 is enveloped insulating layer 605 completely, and carried out with sealing compound 602
The sealing of locating piece 609 and shell 601.Also a through-hole can be added by locating piece 609, quartz sand 606 is entered by through-hole
The chamber of shell 601 and locating piece 609, then sealed by sealing compound 602.
Embodiment 7
As shown in fig. 7, one end of tubular shell 701 is provided with location hole 701a placed in the middle, to facilitate pin to be inserted directly into,
It is centered about, guarantees that quartz sand can coat insulating layer, large area and arc contacts completely.
Embodiment 8
As shown in figure 8, the pin leading-out terminal of setting shell 801 is centered about hole 801a on square shell 801, with
Fixed pin is directly centrally located in the inner cavity of shell 801, guarantees the fully wrapped around insulating layer of quartz sand energy, and large area and electricity
Arc contact.
It is illustrated, and is not had to it should be appreciated that the embodiments of the present invention are only intended to clearly illustrate the utility model
In limitation the utility model, although the utility model is described in detail referring to embodiment, for the technology of this field
For personnel, other various forms of variations or modification can be still carried out on the basis of the above description, or to wherein
Some technical characteristics are equivalently replaced, but within the spirit and principle of the utility model, made any modification, etc.
With replacement, improvement etc., should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of Thermal Cutoffs with arc-extinguishing medium, which is characterized in that the Thermal Cutoffs includes shell, surface cladding
Help low-melting alloy, insulating layer and the conductor of fusing agent；The conductor is connected to the both ends of the low-melting alloy, as drawing
Outlet, the insulating layer are coated on outside the fluxing disconnected agent, are sealed to the fluxing disconnected agent；The Thermal Cutoffs also wraps
Seal is included, for being blocked；In the chamber that the shell, insulating layer and seal are formed, it is filled with arc-extinguishing medium.
2. Thermal Cutoffs according to claim 1, which is characterized in that the arc-extinguishing medium be quartz sand, arc extinguishing cream or
Insulating oil.
3. Thermal Cutoffs according to claim 1, which is characterized in that more parallel connections of the low-melting alloy.
4. Thermal Cutoffs according to claim 3, which is characterized in that wherein one fusing point of the low-melting alloy
Higher than the fusing point of other low-melting alloys, and its diameter is less than the diameter of other low-melting alloys.
5. Thermal Cutoffs according to claim 1, which is characterized in that the insulating layer is UV glue, epoxy resin or uses
The hyaline-quartz pipe or ceramic tube of seal sealing.
6. Thermal Cutoffs according to claim 1, which is characterized in that the shell is thermoplastic material, thermosetting material
Material, ceramics, hyaline-quartz pipe or fiberglass pipe.
7. Thermal Cutoffs according to claim 1, which is characterized in that the low-melting alloy is Filamentous or sheet.
8. Thermal Cutoffs according to claim 1, which is characterized in that the axially opposing extraction of conductor, or draw in the same direction
Out.
9. Thermal Cutoffs according to claim 1, which is characterized in that the Thermal Cutoffs further includes locating piece, institute
Conductor is stated to stretch out across the locating piece.
10. Thermal Cutoffs according to claim 1, which is characterized in that the shell is provided with location hole, the conductor
It is drawn from the location hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820384794.XU CN208173540U (en) | 2018-03-21 | 2018-03-21 | A kind of Thermal Cutoffs with arc-extinguishing medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820384794.XU CN208173540U (en) | 2018-03-21 | 2018-03-21 | A kind of Thermal Cutoffs with arc-extinguishing medium |
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| CN208173540U true CN208173540U (en) | 2018-11-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299272A (en) * | 2018-03-21 | 2019-10-01 | 厦门赛尔特电子有限公司 | A kind of Thermal Cutoffs with arc-extinguishing medium |
| WO2020186713A1 (en) * | 2019-03-20 | 2020-09-24 | 厦门赛尔特电子有限公司 | Thermal cutoff |
-
2018
- 2018-03-21 CN CN201820384794.XU patent/CN208173540U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299272A (en) * | 2018-03-21 | 2019-10-01 | 厦门赛尔特电子有限公司 | A kind of Thermal Cutoffs with arc-extinguishing medium |
| WO2020186713A1 (en) * | 2019-03-20 | 2020-09-24 | 厦门赛尔特电子有限公司 | Thermal cutoff |
| KR20210104120A (en) * | 2019-03-20 | 2021-08-24 | 샤먼 세트 일렉트로닉스 컴퍼니 리미티드 | thermal shut-off device |
| KR102574581B1 (en) * | 2019-03-20 | 2023-09-04 | 샤먼 세트 일렉트로닉스 컴퍼니 리미티드 | thermal barrier |
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