JPH07123018B2 - Temperature sensitive switch - Google Patents
Temperature sensitive switchInfo
- Publication number
- JPH07123018B2 JPH07123018B2 JP1113480A JP11348089A JPH07123018B2 JP H07123018 B2 JPH07123018 B2 JP H07123018B2 JP 1113480 A JP1113480 A JP 1113480A JP 11348089 A JP11348089 A JP 11348089A JP H07123018 B2 JPH07123018 B2 JP H07123018B2
- Authority
- JP
- Japan
- Prior art keywords
- melting point
- low melting
- magnetic powder
- sensitive switch
- metal piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000002844 melting Methods 0.000 claims description 28
- 230000008018 melting Effects 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000006247 magnetic powder Substances 0.000 claims description 20
- 239000004020 conductor Substances 0.000 claims description 18
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 230000004907 flux Effects 0.000 description 8
- 239000003822 epoxy resin Substances 0.000 description 3
- 229910000743 fusible alloy Inorganic materials 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910020220 Pb—Sn Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H2037/768—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material characterised by the composition of the fusible material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
Landscapes
- Thermally Actuated Switches (AREA)
- Fuses (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は合金型感温スイッチの改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in an alloy type temperature sensitive switch.
＜従来の技術＞ 合金型感温スイッチは、低融点可溶金属片の溶融変形に
よって電流遮断または導通を行うものであり、低融点可
溶金属の融点を作動温度としている。第４図は電流遮断
式の合金型感温スイッチを示し、一直線上で互いに対向
せるリード導体１′・１′間に線状の低融点可溶合金片
２′を溶接し、該低融点可溶合金片上にフラックス３′
を塗布し、これらのうえに耐熱性絶縁筒４′（例えば、
セラミックス筒）を挿通し、該絶縁筒の各端と各リード
導体との間を接着剤５′・５′（例えば、エポキシ樹
脂）によって封止してある。<Prior Art> The alloy-type temperature sensitive switch cuts or conducts a current by melting and deforming a low melting point fusible metal piece, and uses the melting point of the low melting point fusible metal as an operating temperature. FIG. 4 shows a current cut-off type alloy type temperature sensitive switch, in which a linear low melting point fusible alloy piece 2'is welded between lead conductors 1'and 1'which face each other in a straight line. Flux 3'on molten alloy piece
And heat-resistant insulating cylinder 4 '(for example,
A ceramic cylinder is inserted, and each end of the insulating cylinder and each lead conductor are sealed with adhesives 5 ′ and 5 ′ (for example, epoxy resin).
上記の感温スイッチは、例えば電気機器等における発熱
を感知し易い部分に取付けて使用する。而して、その電
気機器が過電流により発熱すると、その発熱のために温
度ヒューズが加熱されて低融点可溶合金が溶融し、この
溶融合金が分断され、電気機器への通電が遮断され、機
器の異常発熱、延いては火災を防止できる。The above temperature-sensitive switch is used, for example, by being attached to a portion of an electric device or the like where heat generation is easily detected. Then, when the electric device generates heat due to overcurrent, the temperature fuse is heated due to the heat generation, the low melting point fusible alloy is melted, the molten alloy is divided, and the electric current to the electric device is cut off, It is possible to prevent abnormal heat generation of equipment and eventually fire.
上記溶融合金の分断メカニズムは溶融合金がその表面張
力のために球状化しようとし、この球状化に伴い分断が
生じることにある。The fragmentation mechanism of the molten alloy is that the molten alloy tends to be spheroidized due to its surface tension, and the spheroidization causes fragmentation.
＜解決しようとする課題＞ しかしながら、溶融合金の表面張力はそれほど強力でな
く球状化の速度が遅く、アークを防止できる分断距離に
達するまでに相当の時間を要し、この間事実上導通状態
が継続し、電流遮断を迅速に行い難いことがある。特
に、溶融前の低融点可溶合金の表面に酸化皮膜が存在す
ると、この酸化皮膜が不溶性の固い外皮を形成するから
外皮内が溶融状態になっても上記球状化が進行し難くな
る。このため、低融点可溶合金片上には酸化を防止し
得、たとえ、酸化が生じても合金溶融下の高温でその酸
化物を可溶化し得るフラックス層を設けているが、この
フラックスが上記のアースのためにガス化し、感温スイ
ッチが曝裂することもある。<Problems to be solved> However, the surface tension of the molten alloy is not so strong, the spheroidizing speed is slow, and it takes a considerable time to reach the breaking distance that can prevent the arc, and the conducting state continues during this period. However, it may be difficult to cut off the current quickly. In particular, when an oxide film is present on the surface of the low melting point fusible alloy before melting, the oxide film forms a hard insoluble outer skin, and therefore the above spheroidization is difficult to proceed even if the inside of the outer skin is in a molten state. For this reason, a flux layer that can prevent oxidation and can solubilize the oxide at a high temperature under melting the alloy even if the oxidation occurs is provided on the low melting point alloy piece. It may be gasified due to the earth and the temperature sensitive switch may be exposed.
本願発明の目的は、フラックス量を低減若しくは零とし
ても満足に作動させえる合金型の感温スイッチを提供す
ることにある。An object of the present invention is to provide an alloy type temperature sensitive switch that can be operated satisfactorily even if the amount of flux is reduced or even reduced to zero.
＜課題を解決するための手段＞ 本発明に係る感温スイッチは、一対のリード導体のうち
の少なくとも一方に設けた磁性粉体入り低融点可溶金属
片と一方のリード導体の磁性粉体入り低融点可溶金属片
に電磁作用によって他方のリード導体に向う方向の力を
作用させる磁石を備えていることを特徴とする構成であ
る。<Means for Solving the Problems> A temperature-sensitive switch according to the present invention includes a low melting point fusible metal piece containing magnetic powder provided in at least one of a pair of lead conductors, and one lead conductor containing magnetic powder. The low melting point fusible metal piece is provided with a magnet for exerting a force in a direction toward the other lead conductor by an electromagnetic action.
＜実施例の説明＞ 以下、本発明の実施例を図面により説明する。<Description of Embodiments> Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示している。FIG. 1 shows an embodiment of the present invention.
第１図において、２は一方のリード導体11の先端に設け
た磁性粉体入りの低融点可溶金属片であり、ほぼ球形で
ある。この磁性粉体入りの低融点可溶金属片２には、
鉄、ニッケル、コバルト系の磁性粉体を混合したPb−Sn
系合金を用いることができる。３は磁性粉体入りの低融
点可溶金属片２上に塗布したフラックスであり、省略す
ることもできる。４は保護筒、６は磁石であり、上記の
磁性粉体入り低融点可溶金属片２に他方のリード導体12
に向う方向の磁力線を作用させるように設けてある。こ
の保護筒は、保磁力の大なる磁性粉体をプラスチックま
たはガラスに混合し、この混合物を筒状に成形し、次い
で、磁化することによって製作できる。In FIG. 1, reference numeral 2 denotes a low melting point fusible metal piece containing magnetic powder, which is provided at the tip of one lead conductor 11 and has a substantially spherical shape. The low melting point metal piece 2 containing this magnetic powder has
Pb-Sn mixed with iron, nickel and cobalt based magnetic powder
A system alloy can be used. 3 is a flux applied on the low melting point fusible metal piece 2 containing magnetic powder, and can be omitted. Reference numeral 4 is a protective cylinder, and 6 is a magnet. The low melting point fusible metal piece 2 containing magnetic powder is attached to the other lead conductor 12
It is provided so that the magnetic lines of force in the direction of the arrow act. This protective cylinder can be manufactured by mixing magnetic powder having a large coercive force with plastic or glass, molding the mixture into a cylindrical shape, and then magnetizing the mixture.
5,5は保護筒４の各端と各リード導体との間を封止せる
接着剤、後えばエポキシ樹脂である。Numerals 5 and 5 are adhesives for sealing between each end of the protective cylinder 4 and each lead conductor, which is an epoxy resin later.
第１図に示す感温スイッチにおいては、磁力線のために
磁性粉体入り低融点可溶金属片に他のリード導体に向う
方向の磁力が作用している。従って、周囲温度が上昇
し、低融点可溶金属片が溶融すると、この溶融金属が他
のリード導体に向って伸びて、両リード導体間が導通さ
れる。この場合の動作速度も磁力線に基づく強い磁力の
ために高速にできる。In the temperature-sensitive switch shown in FIG. 1, due to the lines of magnetic force, a magnetic force in the direction toward the other lead conductor acts on the low melting point metal piece containing magnetic powder. Therefore, when the ambient temperature rises and the low melting point fusible metal piece melts, the molten metal extends toward the other lead conductors, and the lead conductors are electrically connected. The operating speed in this case can also be increased due to the strong magnetic force based on the magnetic field lines.
上記の磁性粉体入り低融点可溶金属片２は、第２図に示
すように両方のリード導体11.12に設けてもよい。ま
た、リード導体11側の低融点可溶金属片にのみ磁性粉体
を混合し、リード導体12側の低融点可溶金属片において
は、磁性粉末を無添加とすることもできる。The low melting point fusible metal piece 2 containing magnetic powder may be provided on both lead conductors 11.12 as shown in FIG. It is also possible to mix the magnetic powder only in the low melting point soluble metal piece on the lead conductor 11 side, and to add no magnetic powder to the low melting point soluble metal piece on the lead conductor 12 side.
本発明に係る感温スイツチは上記の直線型に限定される
ことなく、各種の態様で実施できる。例えば、第３図に
示す態様で実施でき（第３図において、11,12はリード
導体、71,72は電極、２は磁性粉体入りの低融点可溶金
属片、41,42は絶縁基板、６は磁石、８はモールド絶縁
体である）、この場合、感温スイッチの製造には、低融
点可溶金属と磁性粉体とフラックスとの枠型成形物を電
極付絶縁基板で挾み、これをエポキシ樹脂で胴巻きし、
枠型成形物の溶融下、磁性粉体を一方の電極側に吸引す
るような磁束を作用させ、磁性粉体の吸引と共に溶融低
融点金属を一方の電極に集中させる方法を用いることが
できる。The temperature-sensitive switch according to the present invention is not limited to the above linear type and can be implemented in various modes. For example, the embodiment shown in FIG. 3 can be carried out (in FIG. 3, 11 and 12 are lead conductors, 71 and 72 are electrodes, 2 is a low melting point metal piece containing magnetic powder, and 41 and 42 are insulating substrates. , 6 is a magnet, and 8 is a mold insulator). In this case, in manufacturing the temperature sensitive switch, a frame-shaped molded product of a low melting point soluble metal, magnetic powder and flux is sandwiched by an insulating substrate with an electrode. , Wrapped this with epoxy resin,
A method can be used in which a magnetic flux that attracts the magnetic powder to one electrode side is applied while the frame-shaped molded product is melted, and the molten low-melting-point metal is concentrated on one electrode while the magnetic powder is attracted.
＜発明の効果＞ 本発明に係る合金型の感温スイッチは上述した通りの構
成であり、低融点可溶金属片に磁性粉末を加えて、この
金属片に磁力を作用させておき、 低融点可溶金属が溶融するとその磁力により該溶融金属
を変形させてスイッチ作動させるものであるから、溶融
金属をその表面張力のみにより変形させている従来例に
較べて作動速度を高速にできる。そして、溶融金属の変
形を溶融金属の表面張力に依存させなくても済むので、
フラックス量の低減乃至は省略が可能であり、アークに
よるフラックスのガス化を排除でき、感温スイッチの爆
裂を防止できる。<Effects of the Invention> The alloy-type temperature-sensitive switch according to the present invention is configured as described above, and magnetic powder is added to a low-melting point soluble metal piece to cause a magnetic force to act on the metal piece, thereby reducing the melting point. When the soluble metal melts, its magnetic force deforms the molten metal to operate the switch. Therefore, the operating speed can be made higher than in the conventional example in which the molten metal is deformed only by its surface tension. And since it is not necessary to make the deformation of the molten metal depend on the surface tension of the molten metal,
The amount of flux can be reduced or omitted, the gasification of the flux by the arc can be eliminated, and the explosion of the temperature sensitive switch can be prevented.
第１図、第２図及び第３図は本発明の異なる実施例を示
す説明図、第４図は従来例を示す説明図である。 １・１……リード導体 ２……磁性粉体入り低融点可溶金属片 ６……磁石1, 2 and 3 are explanatory views showing different embodiments of the present invention, and FIG. 4 is an explanatory view showing a conventional example. 1.1 ...... Lead conductor 2 ... Low melting point metal piece containing magnetic powder 6 ... Magnet
Claims (1)
に設けた磁性粉体入り低融点可溶金属片と、該磁性粉体
入り低融点可溶金属片に電磁作用によって他方のリード
導体に向う方向の力を作用させる磁石を備えていること
を特徴とする感温スイッチ。1. A low melting point fusible metal piece containing magnetic powder provided on at least one of a pair of lead conductors, and a low melting point fusible metal piece containing magnetic powder directed toward the other lead conductor by electromagnetic action. A temperature-sensitive switch characterized by having a magnet for exerting a force in a direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1113480A JPH07123018B2 (en) | 1989-05-01 | 1989-05-01 | Temperature sensitive switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1113480A JPH07123018B2 (en) | 1989-05-01 | 1989-05-01 | Temperature sensitive switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02291623A JPH02291623A (en) | 1990-12-03 |
| JPH07123018B2 true JPH07123018B2 (en) | 1995-12-25 |
Family
ID=14613350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1113480A Expired - Lifetime JPH07123018B2 (en) | 1989-05-01 | 1989-05-01 | Temperature sensitive switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07123018B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972918U (en) * | 1982-11-10 | 1984-05-17 | 小俣 隆司 | Double-sided folding umbrella |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855612B2 (en) * | 1977-08-13 | 1983-12-10 | 宗治 広田 | Overheat protector for electrical appliances |
| JPS60102846U (en) * | 1983-12-20 | 1985-07-13 | 大同産業株式会社 | temperature fuse |
-
1989
- 1989-05-01 JP JP1113480A patent/JPH07123018B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972918U (en) * | 1982-11-10 | 1984-05-17 | 小俣 隆司 | Double-sided folding umbrella |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02291623A (en) | 1990-12-03 |
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