Aramid fiber fuse protection core with arc extinguishing auxiliary function and preparation method thereof

Abstract

The present invention relates to the technical field of fuses, and discloses an aramid fiber fuse protection core with an arc extinguishing auxiliary function and a preparation method thereof, comprising: a support body and a metal wire, wherein the metal wire is wound on the support body, and the support body can isolate the two disconnected ends of the metal wire after the metal wire is melted; wherein the support body is made of aramid fiber. The support body has the characteristics of insulation, flame retardancy, and high temperature resistance. After the metal wire is melted, when the two disconnected ends thereof are separated under the action of external force, they can be isolated by the support body. Since the support body has insulation, the two disconnected ends of the metal wire can quickly cut off the current, and the flame retardancy of the support body can be used to prevent the support body from burning itself. The raw materials used for the protection core are more environmentally friendly and meet the halogen-free environmental protection standards, and can further ensure its isolation performance and improve the arc extinguishing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and more specifically to an aramid fiber fuse protection core with an arc extinguishing auxiliary function and a preparation method thereof. Background Art

[0002] The protective core of the fuse can melt when the current in the circuit where it is located is too large, thereby protecting the circuit. When the protective core melts, the voltage at both ends of it is very high, and it often happens that the protective core has melted, but the current has not been cut off. At the moment of melting, an arc occurs between the two electrodes; therefore, it is necessary to extinguish the arc in time to cut off the current between the two electrodes. In the prior art, quartz sand or a vacuum environment is usually used for arc extinguishing, and gas or liquid is also used for arc extinguishing, but the arc extinguishing may not be complete, resulting in unstable safety. Therefore, it is necessary to propose an aramid fiber fuse protective core with an arc extinguishing auxiliary function and a preparation method thereof, so as to at least partially solve the problems existing in the prior art. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In order to at least partially solve the above problems, the present invention provides an aramid fiber fuse protection core with arc extinguishing auxiliary function, comprising: a support body and a metal wire, wherein the metal wire is wound on the support body, and the support body can isolate the two broken ends of the metal wire after the metal wire is melted; wherein the support body is made of aramid fiber.

[0005] Preferably, the support body is linear, and the metal wire is spirally wound around the support body.

[0006] Preferably, the support body comprises: a first support unit and a second support unit, an isolation area is formed between the first support unit and the second support unit, and the metal wire can be wound in the isolation area.

[0007] Preferably, the second support unit is spirally wound on the first support unit to form a spiral isolation area; and the metal wire is spirally wound in the isolation area.

[0008] Preferably, the spiral isolation zone is formed between the spiral second support units, and the two disconnected ends are separated by melting of the metal wire, and the isolation is performed by the first support unit and the second support unit, thereby assisting in cutting off the arc.

[0009] Preferably, a spiral limiting groove is formed on the outer side of the second supporting unit away from the first supporting unit, and the limiting groove forms a spiral isolation area.

[0010] Preferably, the first support unit and the second support unit are formed with a plurality of perforations, the plurality of perforations form an isolation zone, and the metal wire passes through the plurality of perforations in an S shape; the metal wire is melted to separate the two disconnected ends, and the two disconnected ends can shuttle through the plurality of perforations under the action of opposite pulling forces, thereby assisting in cutting off the arc.

[0011] Preferably, a cross-sectional diameter of the second supporting unit close to the melting point of the metal wire is larger than a cross-sectional diameter of the second supporting unit far from the melting point of the metal wire.

[0012] Preferably, the size of the spiral isolation area is larger than the cross-sectional diameter of the metal wire, and when both ends of the metal wire are subjected to tension, the spiral isolation area can withstand the force exerted on it by the metal wire.

[0013] A method for preparing a protective core, used for preparing the aramid fiber fuse protective core with arc extinguishing auxiliary function of the present invention, comprising:

[0014] Using aramid fiber to make the support body;

[0015] The metal wire is wound on a support body, and the support body can isolate the two broken ends of the metal wire after the metal wire is melted.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The aramid fiber fuse protection core with arc extinguishing auxiliary function and the preparation method thereof described in the present invention have the characteristics of insulation, flame retardancy and high temperature resistance. After the metal wire is melted, its two broken ends are separated by external force and can be isolated by the support body. Since the support body is insulating, the two broken ends of the metal wire can quickly cut off the current, and the flame retardancy of the support body can be used to prevent the support body from burning itself, and can further ensure its isolation performance and improve the arc extinguishing effect. The raw materials used in the protection core are more environmentally friendly and meet the halogen-free environmental protection standards.

[0018] The aramid fiber fuse protection core with arc extinguishing auxiliary function and its preparation method described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the first structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0021] Figure 2 It is a schematic diagram of the first structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function of the present invention after the metal wire is melted;

[0022] Figure 3 This is a schematic diagram of the second structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0023] Figure 4 It is a schematic diagram of the second structure of the support body in the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0024] Figure 5 It is a schematic diagram of the structure when the metal wire is melted in the second structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0025] Figure 6 It is a schematic diagram of the structure in which the two ends are separated after the metal wire is melted in the second structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0026] Figure 7 This is a fourth structural schematic diagram of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0027] Figure 8 It is a schematic diagram of a fourth structure of the support body in the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0028] Fig. 9 It is a schematic diagram of the third structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0029] Fig.10 It is a schematic diagram of the fifth structure of the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0030] Fig.11 A schematic structural diagram of a second supporting unit in the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention;

[0031] Fig.12It is a schematic structural diagram of the sixth structure of the support body in the aramid fiber fuse protection core with arc extinguishing auxiliary function according to the present invention in a natural state;

[0032] Fig.13 It is a schematic structural diagram of the sixth structure of the support body in the aramid fiber fuse protection core with arc extinguishing auxiliary function of the present invention when it is stretched and not deformed;

[0033] Fig.14 It is a schematic diagram of the structure of the sixth structure of the support body in the aramid fiber fuse protection core with arc extinguishing auxiliary function of the present invention when it is stretched and begins to deform;

[0034] Fig.15 This is a schematic structural diagram of the sixth structure of the support body in the aramid fiber fuse protection core with arc extinguishing auxiliary function described in the present invention when it is stretched to a set stretching rate. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0036] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0037] like Figure 1 As shown, the present invention provides an aramid fiber fuse protection core with arc extinguishing auxiliary function, comprising: a support body 1 and a metal wire 2, wherein the support body 1 can isolate the two broken ends of the metal wire 2 after the metal wire 2 is melted; wherein the support body 1 is made of aramid fiber.

[0038] The support body 1 is woven from aramid fibers to support the metal wire 2; and the aramid fibers have good flame retardancy, insulation and high temperature resistance, so that arcs can be extinguished quickly to prevent self-combustion, and the raw materials used to protect the core are more environmentally friendly and meet halogen-free environmental standards;

[0039] The metal wire 2 is wound on the support body 1. After the metal wire 2 melts, its two broken ends are separated by external force and move along the winding path, and can be isolated by the support body 1. Since the support body 1 is insulating, the two broken ends of the metal wire 2 can quickly cut off the current, and the flame retardancy of the support body 1 can prevent the support body 1 from burning itself, thereby further ensuring its isolation performance and improving the arc extinguishing effect.

[0040] When installing the protective core in the fuse, the two ends of the support body 1 can be fixed in the fuse respectively to stretch the support body 1. Since the metal wire 2 is wound on the support body 1, the two ends of the metal wire 2 are electrically connected to the two electrodes of the fuse respectively, wherein at least one end of the metal wire 2 is connected to one electrode of the fuse through a spring. When the metal wire 2 is blown, a pulling force can be formed on the metal wire 2 through the spring, so that the two ends after the blown can move along the isolation area 3, thereby improving the arc extinguishing efficiency and arc extinguishing effect.

[0041] Furthermore, the support body 1 is linear, and the metal wire 2 is spirally wound around the support body 1 .

[0042] like Figure 1 As shown in the first structure of the protective core, the support body 1 can be a straight line, which can be a wound strand or a loose strand, and then the metal wire 2 is wound on the support body 1 in a spiral shape, so that Figure 2 As shown, after the metal wire 2 is melted, its two broken ends can be separated along the spiral winding path, so that the current can be quickly cut off, and the support body 1 will not burn, which is more environmentally friendly.

[0043] like Figure 3 and Figure 4 As shown, in one embodiment, the support body 1 includes: a first support unit 4 and a second support unit 5 , an isolation area 3 is formed between the first support unit 4 and the second support unit 5 , and the metal wire 2 can be wound in the isolation area 3 .

[0044] The first supporting unit 4 and the second supporting unit 5 can make the supporting body 1 have a certain strength to support the metal wire 2. The first supporting unit 4 and the second supporting unit 5 can form the isolation area 3 by weaving.

[0045] In one embodiment, the second support unit 5 is spirally wound on the first support unit 4 to form a spiral isolation area 3 ; the metal wire 2 is spirally wound in the isolation area 3 .

[0046] like Fig.11 As shown, further, the cross-sectional diameter of the second support unit 5 close to the melting point of the metal wire 2 is greater than the cross-sectional diameter of the second support unit 5 far from the melting point of the metal wire 2.

[0047] The cross-sectional diameters of the second support unit 5 at various locations are the same or set to be different. In order to ensure effective support for the metal wire 2 close to the melting point, the cross-sectional diameter of the second support unit 5 at the melting point is set to be larger than the cross-sectional diameter away from the melting point. In this way, when the metal wire 2 is melted and pulled by the elastic force of the spring, the second support unit 5 can effectively resist the pulling force, thereby preventing the second support unit 5 from being deformed near the melting point and causing the arc extinguishing to fail. The strength of the second support unit 5 can be guaranteed, and a strong supporting capacity is provided for the metal wire 2, ensuring that after the metal wire 2 is melted, it can move along the isolation zone 3 under the tension of the spring, thereby ensuring the arc extinguishing effect.

[0048] Furthermore, the size of the spiral isolation area 3 is larger than the cross-sectional diameter of the metal wire 2 , and when both ends of the metal wire 2 are subjected to tension, the spiral isolation area 3 can withstand the force exerted on it by the metal wire 2 .

[0049] The cross-sectional diameter of the metal wire 2 is smaller than the size of the spiral isolation region 3 , that is, the metal wire 2 will not exceed the spiral isolation region 3 , so that the metal wire 2 can remain in the isolation region 3 when moving.

[0050] Furthermore, the metal wire 2 may be elastic as a whole, for example, the metal wire 2 itself is a spring, and a fuse part (tin that is easily melted by heat) is provided at its melting point, that is, the metal wire 2 is installed in the fuse and is in a stretched state, so there is no need to provide an additional spring.

[0051] like Figure 3 , Figure 7 as well as Fig. 9 As shown, a support body 1 with different structures is formed by a first support unit 4 and a second support unit 5, and the metal wire 2 is wound on the support body 1 in a spiral shape.

[0052] like Figure 3 and Figure 4 As shown, it is a second structure of the protective core and the support body 1, the spiral isolation area 3 is formed between the spiral second support units 5, the metal wire 2 is melted to separate the two broken ends, and the isolation is carried out by the first support unit 4 and the second support unit 5 to assist in cutting off the arc.

[0053] like Fig. 9 The third structure of the protective core and the support body 1 is described. Figure 3 and Figure 4The structure shown is different in that the surface of the first support unit 4 is formed by warp threads made of aramid fiber, on which spiral weft threads made of aramid fiber are woven, and the weft threads are arranged to protrude from the surface of the first support unit 4 to form a spiral second support unit 5, and the second support unit 5 is fixed on the first support unit 4; the metal wire 2 is wound in the spiral isolation area 3 formed by the second support unit 5.

[0054] The spiral interval formed by the second support unit 5 is a spiral isolation area 3, and the metal wire 2 is wound in the isolation area 3; when the metal wire 2 is melted, Figure 5 As shown, the metal wire 2 is disconnected at the melting point. After the two ends of the metal wire 2 are pulled by the spring, a pulling force is applied to the disconnected metal wire 2, so that the two ends of the disconnected metal wire 2 are separated by a certain distance, as shown in FIG. Figure 6 The figure shows the positions of the two ends of the metal wire 2. It can be seen that the two disconnected ends are separated by the spiral shape of the second support unit 5. If an arc is generated between the two when melting, the second support unit 5 can effectively separate the two ends. The first support unit 4 and the second support unit 5 are made of aramid fiber, which has good flame retardancy, high temperature resistance and insulation, and can prevent the first support unit 4 and the second support unit 5 from burning at high temperatures. The insulation can effectively cut off the arc and improve the arc extinguishing effect.

[0055] like Figure 7 and Figure 8 As shown, it is a fourth structure of the protective core and the support body 1 , a spiral limiting groove 6 is formed on the outer side of the second support unit 5 away from the first support unit 4 , and the limiting groove 6 forms a spiral isolation area 3 .

[0056] The limiting groove 6 forms a spiral isolation zone 3, which is used to support and limit the metal wire 2; the first support unit 4 is used to carry the second support unit 5, and the second support unit 5 is used to bear the force exerted on it by the metal wire 2, so that when the metal wire 2 melts, its two broken ends can be effectively isolated by the isolation zone 3 to ensure its arc extinguishing effect; the specific principle is the same as the second structure of the support body 1, and will not be repeated here.

[0057] like Fig.10 As shown, it is a fifth structure of the protective core and the support body 1, wherein the first support unit 4 and the second support unit 5 are formed with a plurality of perforations 7, the plurality of perforations 7 form an isolation zone 3, and the metal wire 2 passes through the plurality of perforations 7 in an S shape; the metal wire 2 is melted to separate the two disconnected ends, and the two disconnected ends can shuttle in the plurality of perforations 7 under the action of opposite pulling forces, thereby assisting in cutting off the arc.

[0058] The first support unit 4 and the second support unit 5 can both be made of aramid fiber and have a circular cross-section, and then the two are woven into a Fig.10 The structure shown forms a plurality of through holes 7 between the two. The metal wire 2 passes through the plurality of through holes 7. When the metal wire 2 melts, it is pulled by the spring, causing its two disconnected ends to move away from each other, so that the ends shuttle in an S shape in the through holes 7. During the shuttle process, the two ends cut off the generated arc under the insulating isolation of the first support unit 4 and the second support unit 5, thereby improving the arc extinguishing effect.

[0059] like Figure 12-Figure 15 As shown, the sixth structure of the protective core and the support body 1 is similar to that of Figure 4 The second structure of the support body 1 shown is the same, except that the elasticity of the first support unit 4 is greater than the elasticity of the second support unit 5; when the support body 1 is stretched to a set elongation (i.e., the maximum elongation), the second support unit 5 can be fully stretched into a straight line, and at the same time, the first support unit 4 is spirally wound on the second support unit 5 with a first set number of turns per unit length of the support body 1; when the support body 1 is in a natural state, the second support unit 5 is spirally wound on the first support unit 4 with a second set number of turns per unit length of the support body 1.

[0060] The present invention also provides a method for preparing a protective core, which is used to prepare the aramid fiber fuse protective core with arc extinguishing auxiliary function of the present invention, comprising:

[0061] A support body 1 is made of aramid fiber;

[0062] The metal wire 2 is wound on a support 1 , and the support 1 is capable of isolating the two broken ends of the metal wire 2 after the metal wire 2 is melted.

[0063] The support body 1 is woven from aramid fibers as a whole to support the metal wire 2; and the aramid fibers have good flame retardancy, insulation and high temperature resistance, thereby being able to quickly extinguish arcs and prevent self-combustion, and the raw materials used to protect the core are more environmentally friendly and meet EU environmental protection requirements; after the metal wire 2 is melted, its two disconnected ends are separated by external force and can be isolated by the isolation area 3. Since the support body 1 is insulating, the two disconnected ends of the metal wire 2 can quickly cut off the current, and the flame retardancy of the support body 1 can be used to prevent the support body 1 from burning itself, further ensuring its isolation performance and improving the arc extinguishing effect.

[0064] Further, the support 1 is as follows Fig.12 In the sixth structure shown, the support 1 is in a natural state as Figure 4 The structure shown is the same, except that Fig.12 The support body 1 shown can be deformed after being subjected to force;

[0065] The method for preparing the support body 1 of the sixth structure may be: the first support unit 4 is prepared to have a certain elasticity, specifically, the core material of the first support unit 4 may be an elastic high temperature resistant material, and then an aramid fiber layer is formed on the surface of the core material, the aramid fiber layer needs to ensure that the core material is not exposed, and at the same time can ensure that the first support unit 4 has elasticity, and the second support unit 5 may be made of aramid fiber, and then the first support unit 4 and the second support unit 5 form the support body 1;

[0066] The conditions satisfied by the first supporting unit 4 and the second supporting unit 5 are:

[0067] The first support unit 4 has a greater elasticity than the second support unit 5;

[0068] like Fig.15 As shown, when the support body 1 is stretched to a set elongation (i.e., the maximum elongation), the second support unit 5 can be fully stretched into a straight line. At the same time, the first support unit 4 is spirally wound on the second support unit 5 with a first set number of turns per unit length of the support body 1; wherein the first set number of turns is Determined by the following formula:

[0069]

[0070] in, is the circumference of a circle, is the diameter of the first support unit 4 in the natural state, in millimeters; is the diameter of the second support unit 5, in millimeters; is the set elongation of the support 1;

[0071] The first support unit 4 turns at a first set number of turns The first support unit 4 is twisted by a set multiple (twisting is a process of twisting the stretched thin strips by rotary motion, like twisting a towel when washing your face, so as to fix the longitudinal connection between the fibers. The strips are twisted around their own axis for one circle, i.e., the number of turns is 1), wherein the setting multiple ranges from 1 to 3, and the direction of the self-twisting of the first support unit 4 is opposite to the direction of its spiral winding;

[0072] like Fig.12 As shown, when the support body 1 is in a natural state, the second support unit 5 is spirally wound on the first support unit 4 with a second set number of turns per unit length of the support body 1; wherein the second set number of turns is Determined by the following formula:

[0073]

[0074] in, is the circumference of a circle, is the diameter of the first support unit 4 in the natural state, in millimeters; is the diameter of the second support unit 5, in millimeters; is the set elongation of the support 1;

[0075] When the support body 1 is prepared by the above method, the metal wire 2 is an elastic metal wire (i.e., spring-shaped). After the metal wire 2 is wound on the support body 1, both ends of the metal wire 2 and both ends of the support body 1 are connected to the spring, which is connected to the electrode of the fuse through the spring. After installation, the spring stretches the support body 1 to keep Fig.13 The state shown is that the first support unit 4 is stretched and not deformed (the support body 1 has not reached the set elongation), and the second support unit 5 is spirally wound on the first support unit 4, and the metal wire 2 is spirally wound in the isolation area 3; when the metal wire 2 is not melted, the metal wire 2 and the support body 1 jointly resist the force of the spring, and after the metal wire 2 is melted, the spring increases the tension on the support body 1, so that the support body 1 reaches the set elongation, that is, Fig.15 In the state shown, the second support unit 5 is fully stretched and unfolded, while the first support unit 4 is wound in a spiral shape. Fig.14 As shown, the first support unit 4 begins to deform, and the two disconnected ends of the metal wire 2 wound on the isolation area 3 are instantly isolated by the deformation of the first support unit 4, that is, the two ends are instantly located at the positions shown in FIG. Fig.15 As shown, both sides of a certain spiral section (white area) of the first support unit 4 are instantly cut off by the first support unit 4 and the second support unit 5 to achieve insulation isolation and arc extinguishing effect.

[0076] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An aramid fiber fuse protection core with arc extinguishing auxiliary function, characterized in that: include: A support body (1) and a metal wire (2), wherein the metal wire (2) is wound on the support body (1), and the support body (1) is capable of isolating two disconnected ends of the metal wire (2) after the metal wire (2) is melted; wherein the support body (1) is made of aramid fiber; The support body (1) comprises: a first support unit (4) and a second support unit (5); an isolation area (3) is formed between the first support unit (4) and the second support unit (5); and the metal wire (2) can be wound in the isolation area (3); The second support unit (5) is spirally wound on the first support unit (4) to form a spiral isolation area (3); the metal wire (2) is spirally wound in the isolation area (3); The elasticity of the first support unit (4) is greater than the elasticity of the second support unit (5); when the support body (1) is stretched to a set elongation, the second support unit (5) can be fully stretched into a straight line, and at the same time, the first support unit (4) is spirally wound on the second support unit (5) with a first set number of turns per unit length of the support body (1); when the support body (1) is in a natural state, the second support unit (5) is spirally wound on the first support unit (4) with a second set number of turns per unit length of the support body (1).

2. The aramid fiber fuse protection core with arc extinguishing auxiliary function according to claim 1, characterized in that: The spiral isolation area (3) is formed between the spiral second support units (5); the metal wire (2) is fused to separate the two disconnected ends, and isolation is performed by the first support unit (4) and the second support unit (5), thereby assisting in cutting off the arc.

3. The aramid fiber fuse protection core with arc extinguishing auxiliary function according to claim 1, characterized in that: The cross-sectional diameter of the second support unit (5) close to the melting point of the metal wire (2) is greater than the cross-sectional diameter of the second support unit (5) far from the melting point of the metal wire (2).

4. The aramid fiber fuse protection core with arc extinguishing auxiliary function according to claim 1, characterized in that: The size of the spiral isolation area (3) is larger than the cross-sectional diameter of the metal wire (2), and when both ends of the metal wire (2) are subjected to tension, the spiral isolation area (3) is able to withstand the force exerted on it by the metal wire (2).

5. A method for preparing a protective core, used for preparing the aramid fiber fuse protective core with arc extinguishing auxiliary function as claimed in claim 1, characterized in that: include: A support body (1) is made of aramid fiber; The metal wire (2) is wound on a support body (1), and the support body (1) is capable of isolating two disconnected ends of the metal wire (2) after the metal wire (2) is melted.

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