Method of using an alloy type thermal fuse, and alloy type thermal fuse
a technology of thermal fuse and alloy, which is applied in the direction of heating/cooling contact switches, etc., can solve the problems of long-term dc application trouble, adversely affecting the ecological system, etc., and achieve excellent stability, excellent stability, and safe and rational
Inactive Publication Date: 2005-10-06
UCHIHASHI ESTEC
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Benefits of technology
"The patent text describes an alloy type thermal fuse that uses an In—Sn alloy as a fuse element. The fuse is designed to provide stability under long-term DC application, but can still break under high temperatures. The patent proposes using the alloy as an AC-only fuse for protecting against overheating of AC electronic / electrical appliances, or as a DC fuse for protecting against overheating of DC electronic / electrical appliances. The method of using the alloy type thermal fuse involves rationally using an AC-only or DC fuse based on the operating temperature and the alloy composition. The use of an alloy type thermal fuse in which the In—Sn alloy is used as a fuse element provides safety and reliability in the use of the fuse."
Problems solved by technology
In the case where an electronic / electrical appliance contains lead, when the appliance is scrapped, lead leaks out of the scrap to adversely affect the ecological system.
According to results of intensive studies by the inventors on an alloy type thermal fuse in which an In—Sn alloy is used as a fuse element, however, it was unexpectedly found that, when a DC current is applied to the fuse for a long term, a trouble due to the long-term DC application occurs, or for example a shear fracture of the fuse element occurs at a temperature which is lower than the melting point of the fuse element.
Although an alloy type thermal fuse in which an In—Sn alloy is used as a fuse element satisfies the operating temperature condition of a thermoprotector, such an alloy type thermal fuse is hardly used as a thermoprotector because of the above-mentioned troubles due to long-term DC application such as the destructiveness caused by long-term DC application.
Method used
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example 1
[0068] Cylindrical thermal fuses in which a fuse element is made of an In—Sn alloy of 74% In and 26% Sn were used as AC fuses, and cylindrical thermal fuses in which a fuse element is made of a Bi—Sn—In alloy of 50% Bi, 45% Sn, and 5% In were used as DC fuses. The operating temperature of the former fuses is 129.2±1° C., and that of the latter fuses is 129.7±1° C. Namely, the operating temperatures are substantially identical with each other.
[0069] In fifty AC fuses, the fuse elements of 28 fuses were broken in the long-term DC application aging test. With respect to the long-term DC application aging, therefore, the fuses were evaluated as unacceptable. In the DC fuses, none of the fuse elements was broken in the long-term DC application aging test. With respect to the long-term DC application aging, therefore, the fuses were evaluated as acceptable.
[0070] The operating temperatures of fifty specimens after the long-term DC application aging test were measured. As a result, no su...
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Abstract
An In—Sn alloy of 85 to 52% In provides advantages that dispersion of an operating temperature can be sufficiently eliminated, and that a high yield can be ensured by adequate ductility, but has a defect which is fatal to a DC fuse, or in which troubles due to long-term DC application such as long-term DC application breakage occurs. In view of this fact, when an alloy type thermal fuse in which an In—Sn alloy is used as a fuse element is used under DC application, stability under long-term DC application that is a condition severer than that under AC application is imposed on the alloy type thermal fuse, whereby the fuse can be rationally used. An AC electronic / electrical appliance is protected against overheating by an AC-only alloy type thermal fuse in which a fuse element is made of an In—Sn alloy, and which has a predetermined operating temperature, and a DC electronic / electrical appliance is protected against overheating of a same temperature by a DC alloy type thermal fuse in which the alloy composition of a fuse element is different from that of the AC-only alloy type thermal fuse.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of, in the case where an alloy type thermal fuse in which an In—Sn alloy is used as a fuse element is used under DC application, rationally using the alloy type thermal fuse while imposing a condition of stability under long-term DC application which is severer than that under AC application. [0003] 2. Description of Related Art [0004] In an alloy type thermal fuse, a fusible alloy having a predetermined melting point is used as a fuse element, and a flux is applied to the fuse element. Such an alloy type thermal fuse is disposed so as to be thermally contacted with an electronic / electrical appliance. The fuse element is melted by heat generation due to abnormality of the electronic / electrical appliance, and the molten alloy is divided and spheroidized because of the surface tension under the coexistence with the molten flux. When the temperature of the appliance is lowered ...
Claims
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IPC IPC(8): C22C13/02C22C12/00C22C28/00H01H37/76
CPCH01H37/76
Inventor TANAKA, YOSHIAKIIKAWA, NAOTAKAIWAMOTO, MIKISARUWATARI, TOSHIAKI
Owner UCHIHASHI ESTEC