This application is based upon and claims priority under 35 U.S.C. 119 from Taiwan Patent Application No. 111118418 filed on May 17, 2022, which is hereby specifically incorporated herein by this reference thereto.
The present disclosure relates to a protection element, especially to a protection element for connecting to the rest electrical elements in the circuit, and for supplying protection effect against the overcurrent.
A power circuit usually has a protective element. When a power loop of the power circuit is abnormal, such as the overcurrent or the overvoltage is occurred, the protective element cuts off the power loop of the power circuit to protect the power circuit. The conventional protection element in accordance with the prior arts has a main body, a low melting point alloy layer and an electrode layer. The low melting point alloy layer is disposed on a main body. The electrode layer connects to the low melting point alloy layer. When a closed circuit is formed, a current pass the low melting point alloy layer through the electrode layer. When the overcurrent or the overvoltage is occurred, the low melting point alloy layer is melted because of overheating to protect the power circuit by opening the power circuit.
The low melting point alloy layer in accordance with the prior arts is usually coated by a flux. The flux not only assists in the melting of the low melting point alloy layer, but usually protects the low melting point alloy layer and prevents the low melting point alloy layer from oxidation. However, evenly coating the flux on the low melting point alloy layer is time-consuming and labor-intensive. Therefore, the conventional protection element in accordance with the prior arts needs to be improved.
In view of the above, the present invention is to improve a structure of the protection element, and to evenly coat the flux on the low melting point alloy layer in a time-saving and an effortless way.
The main technical features used to achieve the objection as mentioned above is that the protection element with a cover includes:
a main body having
a cover mounted on the main body having
a flux placed in the receiving recess of the cover, wherein when a temperature of the protection element increases, the flux melts and flows into the at least one guiding passage from the receiving recess so that the melted flux is correspondingly disposed on the at least one melting area of the low melting point alloy layer.
The present invention includes at least the advantages described below. When the flux is melted, the flux is kept on the melting area of the low melting point alloy layer by the design of the guiding passage and the receiving recess of the cover. Therefore, it is only necessary to place the flux in the receiving recess during manufacture, which can effectively reduce the manufacturing steps and thus reduce the production cost.
With reference to the attached drawings, the present invention is described by means of the embodiments below where the attached drawings are simplified for illustration purposes only to illustrate the structures or methods of the present invention by describing the relationships between the components and assembly in the present invention. Therefore, the components shown in the figures are not expressed with the actual numbers, actual shapes, or actual dimensions, nor with the actual ratio. Some of the dimensions or dimension ratios have been enlarged or simplified to provide a better illustration. The actual numbers, actual shapes, or actual dimension ratios can be selectively designed and disposed, and the detailed component layouts may be more complicated.
With reference to
With reference to
In one embodiment, the inner connection layer 12 includes two inner loop electrodes 121. The inner loop electrodes 121 are respectively disposed on and adjacent to the long sides of the first surface 111. The outer connection layer 13 includes two outer loop electrodes 131. The outer loop electrodes 131 are respectively disposed on and adjacent to the long sides of the second surface 112. The outer loop electrodes 131 respectively and electrically connect to the inner loop electrodes 121. The low melting point alloy layer 15 is mounted across the inner loop electrodes 121 and has two melting areas 151. The melting areas 151 are respectively disposed on and adjacent to the inner loop electrodes 121. When the outer connection layer 13 connects to the external power circuit through the outer loop electrodes 131, the current passes through the outer loop electrodes 131, the inner loop electrodes 121 and the low melting point alloy layer 15 to form a closed circuit.
With reference to
In one embodiment, the receiving recess 22 is defined by two sidewalls 221 and a receiving space 222. Each sidewall 221 has two ends. The receiving space 222 has two sides. The sidewalls 221 are respectively disposed on the sides of the receiving space 222. Each guiding passage 23 has a rib 231, the ribs 231 are perpendicularly disposed on one of the ends of the sidewalls 221. Each rib 231 has a ladder 232 and a low wall 233. Each ladder 232 is composed of continuous indentations with different thicknesses. The low walls 233 of the ribs 231 are adjacent to the receiving space 222 of the receiving recess 22. A thickness of each low wall 233 is smaller than a thickness of each sidewall 221. Each ladder 232 is adjacent to and communicates with the receiving space 222 of the receiving recess 22. One side of each ladder 232 has a long side wall 234 far from the receiving space 222. With reference to
When the external power circuit is turned on, the current is conducted from the outer connection layer 13 and passes through the inner connection layer 12 and the low melting point alloy layer 15. Because the melting area 151 is adjacent to the connecting portion between the low melting point alloy layer and the inner connection layer 12, the temperature of the melting area 151 increases first in reacting to a risen temperature of a circuit when an overcurrent is occurred. The flux 30 is effectively kept on the melting area 151 of the low melting point alloy layer 15 through the guiding passage 23. Thus, the flux 30 easily helps to speed up the fusion of the melting area 151 of the low melting point alloy layer 15 and achieves an opened circuit rapidly to protect the external power circuit.
In one embodiment, as shown in
In one embodiment, a plurality of conductive vias are formed in the base 11 to achieve an electrical connection between the outer loop electrode 131 and the inner loop electrode 121, an electrical connection between the inner thermal electrode 161 and the heating layer 14, and an electrical connection between the outer thermal electrode 162, the outer connection layer 13 and the heating layer 14.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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111118418 | May 2022 | TW | national |