A thermal protection module for surge protectors

Abstract

This utility model relates to a thermal fuse protection module for surge protectors, including a housing, which is cylindrical in shape and filled with insulating material for enclosing the fuse. Both ends of the housing are sealed with end caps. The fuse includes a tripping element, a mounting base, a metal strip, and a spring. Two fuses are mounted mirror-symmetrically inside the housing. The mounting bases are installed at both ends inside the housing. The metal strips are movably mounted in adjacent ends of the two mounting bases. The tripping element is spot-welded to the two metal strips at both ends. The spring is installed inside the mounting base and is positioned along the axial direction of the mounting base. One end of the spring is connected to the metal strip, and the other end is connected to the inner bottom of the mounting base. One end of the electrode is connected to the metal strip, and the other end extends through the mounting base and end caps to the outside of the housing. The spring retracts the metal strip into the mounting base, increasing the distance between it and the tripping element, ensuring complete separation of the metal strip from the tripping element and improving the safety of the surge protector.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment protection technology, and in particular to a thermal fuse protection module for surge protectors. Background Technology

[0002] Thermal fuses utilize a metallic conductor (such as lead-tin alloy, zinc, silver, etc.) as a fusible element connected in series in the circuit. When the current exceeds the rated value, the fusible element generates Joule heat (Q = 0.24I) due to the resistance effect. 2 Heat accumulation causes the temperature to rise to the metal's melting point, triggering melting and severance. Under normal operating conditions, the heat generated by the molten metal reaches equilibrium with the external environment through heat dissipation, keeping the molten metal in a solid state. When the current is abnormal (overload or short circuit), the rate of heat generation exceeds the rate of heat dissipation, triggering melting and severance. Currently, in some highly sensitive scenarios, low-melting-point alloys are often used to weld the molten metal to the metal plate. However, during melting and severance, the end of the molten metal may remain partially connected to the metal plate, resulting in incomplete melting and a short circuit, which can easily cause a fire. Therefore, improvements are needed. Utility Model Content

[0003] Therefore, it is necessary to provide a thermal fuse protection module for surge protectors to address the above problems.

[0004] A surge protector thermal fuse protection module includes a housing, which is cylindrical and made of insulating material. The housing is filled with insulating material to enclose the fuse. Both ends of the housing are sealed by end caps. The fuse includes a tripping element, a fixing base, a metal sheet, and a spring. Two fuses are mounted mirror-symmetrically inside the housing. The fixing base is installed at both ends inside the housing and is hollow. The metal sheet is movably installed in one adjacent end of the two fixing bases. The tripping element is spot-welded to the two metal sheets at both ends. The spring is installed inside the fixing base and is arranged along the axial direction of the fixing base. One end of the spring is connected to the metal sheet, and the other end is connected to the inner bottom of the fixing base. One end of the electrode is connected to the metal sheet, and the other end extends through the fixing base and end cap to the outside of the housing.

[0005] Preferably, the inner wall of the fixing base is provided with a guide strip along the axial direction, and the edge of the metal sheet is provided with a notch corresponding to the guide strip.

[0006] Preferably, the insulating material is ceramic.

[0007] Preferably, the edge of the release element is provided with a notch or groove.

[0008] Preferably, the end of the metal sheet facing the tripping component has a spot weld.

[0009] The advantages of this utility model are: by using a spring to drive the metal plate back into the fixed base, the distance between the metal plate and the tripping component is increased, ensuring that the metal plate is completely separated from the tripping component, ensuring that the circuit where the surge protector is located is in a completely disconnected state, and improving the safety of the surge protector. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of a thermal fuse protection module for a surge protector, as one embodiment.

[0011] Figure 2 This is a schematic diagram of an explosion of a thermal fuse protection module for a surge protector. Detailed Implementation

[0012] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0013] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0015] like Figures 1-2As shown, a surge protector thermal fuse protection module includes a housing 1, which is cylindrical and made of insulating material. The housing 1 is filled with insulating material for wrapping a fuse 3. Both ends of the housing 1 are sealed by end caps 2. The fuse 3 includes a tripping element 31, a fixing base 32, a metal sheet 33, and a spring 34. Two fuses 3 are installed symmetrically in the housing 1. The fixing base 32 is installed at both ends of the housing 1 and is hollow. The metal sheet 33 is movably installed in one adjacent end of the two fixing bases 32. The tripping element 31 is spot-welded to the two metal sheets 33 at both ends. The spring 34 is installed in the fixing base 32 and is arranged along the axial direction of the fixing base 32. One end of the spring 34 is connected to the metal sheet 33, and the other end is connected to the inner bottom of the fixing base 32. One end of the electrode 4 is connected to the metal sheet 33, and the other end extends through the fixing base 32 and the end cap 2 to the outside of the housing 1. Specifically, the insulating material filled inside the outer casing 1 is quartz sand. When the fuse 3 melts, the high-temperature arc generated will be divided, cooled and absorbed by the quartz sand particles. Through its physical insulation properties, the arc is extinguished quickly and the arc is prevented from reigniting. The fuse 3 includes a tripping element 31, a mounting base 32, a metal strip 33, and a spring 34. The mounting base 32 is cylindrical in shape and hollow inside to fit the cylindrical housing, and is used to install the metal strip 33 and the spring 34. The two ends of the tripping element 31 are welded to the metal strip 33 by a low melting point alloy. At this time, the spring 34 is sealed in the mounting base 32 by the metal strip 33. Due to the presence of the tripping element 31, the springs 34 in both mounting bases 32 are in a stretched state. When an overload occurs, the tripping element 31 melts itself or the weld between it and the metal strip 33 melts. The spring 34 can then, under its own elastic force, drive the metal strip 33 back into the mounting base 32, increasing the distance between it and the tripping element 31. This ensures that the metal strip 33 is completely separated from the tripping element 31, ensuring that the circuit where the surge protector is located is completely disconnected, preventing the temperature of the surge protector from rising further, thereby improving the safety of the surge protector.

[0016] like Figure 2 As shown, a guide strip 321 is provided on the inner wall of the fixing base 32 along the axial direction, and a notch 331 is provided on the edge of the metal piece 33 corresponding to the guide strip 321. Specifically, by utilizing the cooperation between the guide strip 321 and the notch 331, after the release member 31 separates from the metal piece 33, the metal piece 33, under the action of the spring 34, retracts along the guide strip 321 into the fixing base 32, restricting the displacement direction of the metal piece 33 and preventing it from deviating.

[0017] Specifically, the insulating material is ceramic, which has high structural strength, high temperature resistance, corrosion resistance, and excellent heat dissipation performance.

[0018] like Figure 2As shown, the edge of the tripping component 31 is provided with a notch 311 to reduce the surface area of ​​the tripping component 31. The notch 311 is also used to form a stress concentration point through structural weakening, which can accurately control the melting position and avoid uneven arc distribution caused by random breakage of the tripping component 31.

[0019] like Figure 2 As shown, the metal sheet 33 has a spot weld position 332 on one end facing the release member 31 for spot welding, which determines the welding position of the release member 31 and avoids welding misalignment.

[0020] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A thermal fuse protection module for surge protectors, characterized in that: The device includes a cylindrical housing made of insulating material, which is filled with insulating material to enclose the fuse. Both ends of the housing are sealed with end caps. The fuse includes a tripping element, a fixing base, a metal plate, and a spring. Two fuses are mounted mirror-symmetrically inside the housing. The fixing base is installed at both ends inside the housing and is hollow. The metal plate is movably installed in one adjacent end of the two fixing bases. The tripping element is spot-welded to the two metal plates at both ends. The spring is installed inside the fixing base and is arranged along the axial direction of the fixing base. One end of the spring is connected to the metal plate, and the other end is connected to the inner bottom of the fixing base. One end of the electrode is connected to the metal plate, and the other end extends through the fixing base and end cap to the outside of the housing.

2. The surge protector thermal fuse protection module as described in claim 1, characterized in that: The inner wall of the fixed base is provided with a guide strip along the axial direction, and the edge of the metal sheet is provided with a notch corresponding to the guide strip.

3. The surge protector thermal fuse protection module as described in claim 1, characterized in that: The insulating material is ceramic.

4. The surge protector thermal fuse protection module as described in claim 1, characterized in that: The release element has a notch or groove on its edge.

5. A surge protector thermal fuse protection module as described in claim 4, characterized in that: The metal sheet has a spot weld on the end facing the tripping component.

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