Fuse link, fuse and electric device

Abstract

The utility model discloses a fuse link, a fuse and an electric device, and belongs to the field of fuses. The fuse link is provided with a fusing part, a first end used for being connected with a negative electrode and a second end used for being connected with a positive electrode, the fuse link is provided with a first narrow-diameter part between the fusing part and the first end, and the fuse link is provided with a second narrow-diameter part between the fusing part and the second end; the distance between the fusing part and the adjacent first narrow part is smaller than the distance between the fusing part and the adjacent second narrow part. The fusing part is arranged at the first narrow-diameter part on the side, closer to the negative electrode, of the fusing body, when current is overloaded, the fusing part is fused, arcing occurs at the fusing part, an electric arc ignites the first narrow-diameter part and the second narrow-diameter part which are located on the two sides of the fusing part, the fusing part is closer to the negative electrode, the distance of firing towards the positive electrode is reduced, the electric arc is made to be away from a high-temperature area, and the service life of the fuse body is prolonged. The influence of temperature on arc burning is reduced, and rapid arc extinguishing can be realized.

Description

Technical Field

[0001] This application belongs to the field of fuse technology, and particularly relates to a fuse element, a fuse, and an electrical device. Background Technology

[0002] Fuse is a commonly used circuit protection device. When current breaking tests are performed on existing fuses, they will melt, break, and arc, and the arc will continue to burn, making it difficult to extinguish, which poses a safety hazard. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the related art. To this end, this application proposes a fuse element, a fuse circuit breaker, and an electrical device to achieve faster arc extinguishing and prevent the electric arc from deteriorating and burning at high temperatures.

[0004] In a first aspect, this application provides a fuse, comprising: a fuse portion, a first end for connection to a negative electrode and a second end for connection to a positive electrode, wherein the fuse portion is provided with a first narrow diameter portion between the fuse portion and the first end, and the fuse portion is provided with a second narrow diameter portion between the fuse portion and the second end, wherein the distance between the fuse portion and the adjacent first narrow diameter portion is less than the distance between the fuse portion and the adjacent second narrow diameter portion.

[0005] According to the fuse of this application, by setting the fuse part at the first narrow diameter part closer to the negative electrode side of the fuse body, the distance of the arc to burn towards the positive electrode during arc initiation is reduced, so that the arc is kept away from the high temperature area and the arc can be extinguished quickly.

[0006] According to one embodiment of this application, the following condition is satisfied: L2 / L1≥5, where L1 is the distance between the fused portion and the adjacent first narrow diameter portion, and L2 is the distance between the fused portion and the adjacent second narrow diameter portion.

[0007] According to the fuse of this application, the distance between the fuse portion and the adjacent second narrow diameter portion is greater than or equal to 5 times the distance between the fuse portion and the adjacent first narrow diameter portion, which reduces the distance the arc travels towards the positive electrode when the arc is ignited, and can quickly extinguish the arc and prevent the arc from deteriorating and burning at high temperatures.

[0008] According to one embodiment of this application, the fused portion is provided with a groove, and the inner wall of the groove is provided with a molten layer.

[0009] According to the fuse of this application, by providing a groove in the fuse portion and providing a melting layer in the groove, the fuse portion can lower the melting point when the current is overloaded, and fuse more quickly.

[0010] According to one embodiment of this application, the groove extends along the width direction of the fuse to the edge of the fuse, and a heat-resistant plug is provided at the end of the groove.

[0011] According to the fuse of this application, the groove of the fuse portion extends along the width direction of the fuse to the edge of the fuse, and a heat-resistant plug is provided at the end of the groove, which can prevent the liquid melt layer from flowing out. At the same time, when the arc is ignited, the heat-resistant plug can effectively protect other components from the effects of high temperature.

[0012] According to one embodiment of this application, the surface of the molten layer away from the groove is provided with an adhesion layer.

[0013] According to the fuse of this application, by providing an adhesion layer on the molten layer, the arc is extinguished while ensuring that the molten layer does not flow arbitrarily after melting. According to one embodiment of this application, both the first narrow diameter portion and the second narrow diameter portion are provided with a plurality of perforations arranged along the width direction of the fuse.

[0014] According to the fuse of this application, by providing multiple hollow holes along the width direction of the fuse in both the first and second narrow diameter portions, the cross-sectional area of ​​the first and second narrow diameter portions is reduced, the metal material in the first and second narrow diameter portions is reduced, and the fuse is quickly melted while arcing is reduced.

[0015] According to one embodiment of this application, the plurality of hollow holes at the first narrow diameter portion and the second narrow diameter portion each include a circular hole and an arc-shaped notch provided at the edge of the fuse body.

[0016] According to the fuse of this application, by providing a circular hole and an arc-shaped notch at the first narrow diameter portion and the second narrow diameter portion, the first narrow diameter portion and the second narrow diameter portion can be quickly melted when the arc is still burning after the fuse portion melts. The first narrow diameter portion and the second narrow diameter portion have less metal material, less metal vapor when the arc is ignited, and the arc is extinguished better.

[0017] According to one embodiment of this application, the fuse includes a plurality of bent segments, and a receiving groove for accommodating an insulating medium is formed between each of the bent segments.

[0018] According to the fuse of this application, by setting multiple bending sections on the fuse, the arc burning distance is extended, and the insulating medium is contained in the receiving groove formed by the bending sections to insulate and extinguish the arc.

[0019] Secondly, this application provides a fuse, which includes:

[0020] First terminal;

[0021] Second terminal;

[0022] The fuse as described in the above embodiments; wherein

[0023] The first terminal and the second terminal are respectively connected to the first end and the second end of the fuse.

[0024] According to the fuse of this application, by connecting a first terminal and a second terminal to the first and second ends of the fuse body respectively, a fuse that can be connected into a circuit is formed to protect the circuit.

[0025] According to one embodiment of this application, it further includes: a housing, the fuse being located within the housing, and the housing being filled with an insulating medium.

[0026] According to the fuse of this application, by placing the fuse element inside the housing and placing the insulating medium inside the hollow cavity of the housing, the fuse can be connected to the circuit and operate more safely.

[0027] Thirdly, this application provides an electrical appliance, which includes:

[0028] The fuse as described in the above embodiments.

[0029] According to the electrical device of this application, by connecting the electrical device to a fuse, when the current of the electrical device exceeds the set current, the fuse will quickly melt and break. Furthermore, when the fuse starts to arc, the arc can be controlled within the fuse housing and quickly extinguished, thereby improving the safety of the electrical device and reducing the manufacturing cost of the electrical device.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is one of the structural schematic diagrams of the fuse provided in the embodiments of this application;

[0033] Figure 2 This is a second schematic diagram of the structure of the fuse provided in the embodiments of this application;

[0034] Figure 3 This is the third schematic diagram of the structure of the fuse provided in the embodiments of this application;

[0035] Figure 4 This is a schematic diagram of the structure of the fuse provided in the embodiment of this application.

[0036] Figure label:

[0037] Fuse 1000;

[0038] Fuse element 100;

[0039] Fusible part 110, groove 111, molten layer 1111, heat-resistant plug 1112;

[0040] First end 120;

[0041] Second end 130;

[0042] First narrow section 140, hollow hole 141, round hole 1411, arc-shaped notch 1412;

[0043] Second narrow section 150;

[0044] Bending section 160, receiving groove 161;

[0045] First terminal 200;

[0046] Second terminal 300;

[0047] 400 for the casing. Detailed Implementation

[0048] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0049] The principle by which the fuse 100 proposed in this application achieves the above-mentioned beneficial effects will be explained in detail below:

[0050] To solve this technical problem, this application provides a fuse 100, as described below. Figures 1-4 Describes a fuse 100 according to an embodiment of this application.

[0051] like Figure 1 , Figure 2 As shown, the fuse 100 in this embodiment includes: a fuse portion 110, a first end 120, a second end 130, a first narrow diameter portion 140, and a second narrow diameter portion 150.

[0052] The fuse element 110 is located on the fuse body 100 and is used to melt first when the current exceeds the safe value.

[0053] The fuse 100 can typically be made of materials such as zinc, silver, copper-silver alloy, or copper. In this embodiment, it is made of copper metal.

[0054] The fusible part 110 is the part of the fusible body 100 that melts first, and the melting point of the fusible part 110 is lower than that of the rest of the fusible body 100.

[0055] The fusible part 110 can typically be made of materials such as tin, zinc, tin-lead alloy, or tin-cadmium alloy.

[0056] In this embodiment, the fusible part 110 is made of tin metal, which has a lower melting point than copper metal.

[0057] like Figure 1 , Figure 2 As shown, the first end 120 and the second end 130 are located at the two ends of the fuse 100, respectively. The first end 120 is used to connect to the negative electrode, and the second end 130 is used to connect to the positive electrode.

[0058] In this embodiment, the fuse 100 has a plurality of first narrow diameter portions 140 between the fuse portion 110 and the first end 120, and the fuse 100 has a plurality of second narrow diameter portions 150 between the fuse portion 110 and the second end 130.

[0059] The number of the first narrow section 140 and the second narrow section 150 is selected according to parameters such as circuit voltage and current.

[0060] like Figure 1 , Figure 2 , Figure 3 As shown, the distance between the fused portion 110 and the adjacent first narrow diameter portion 140 is less than the distance between the fused portion 110 and the adjacent second narrow diameter portion 150.

[0061] An insulating medium is provided at the first narrow section 140 and the second narrow section 150. The insulating medium absorbs the heat of the electric arc when the arc is ignited and quickly extinguishes the arc.

[0062] It should be noted that the insulating medium can be quartz sand, specific gases, arc-quenching oil, chlorides, and composite materials, etc. In this embodiment, quartz sand is used as the insulating medium.

[0063] The first narrow section 140 and the second narrow section 150 can process metal materials into the required shapes and sizes through processes such as drawing and stamping.

[0064] In related technologies, the fusible section is the location where the first break appears on the fusible body. When the fusible body breaks, electrons from the negative electrode flow to the positive electrode, and the temperature of the positive electrode will be higher than that of the negative electrode. The high temperature inhibits the arcing, making it more difficult to extinguish the arc and posing a safety hazard.

[0065] In this embodiment, the distance between the fuse portion 110 and the adjacent first narrow diameter portion 140 is less than the distance between the fuse portion 110 and the adjacent second narrow diameter portion 150. That is, the fuse portion 110 is located on the fuse body 100 closer to the negative electrode in the first row of narrow diameters. When the current is overloaded, the fuse portion 110 melts and an arc is generated at the fuse portion 110. The insulating medium at the fuse portion 110 extinguishes the arc. If the arc is not completely extinguished, the arc continues to burn the first narrow diameter portion 140 and the second narrow diameter portion 150 located on both sides of the fuse portion 110. The insulating medium at the first narrow diameter portion 140 and the second narrow diameter portion 150 continues to extinguish the arc and melt until the arc is extinguished and insulation is established. The fuse portion 110 is closer to the negative electrode, which reduces the distance to the positive electrode, keeps the arc away from the high temperature area, reduces the influence of temperature on the arc burning, and is more conducive to arc extinguishing.

[0066] According to the embodiment of this application, by setting the fuse portion 110 on the fuse portion 100 at the first narrow diameter portion 140 closer to the negative electrode, the distance of the arc from the positive electrode to the arc is reduced, and the arc is kept away from the high temperature area, so that the arc can be extinguished quickly.

[0067] In some embodiments, the fuse 100 may satisfy: L2 / L1≥5, where L1 is the distance between the fuse portion 110 and the adjacent first narrow diameter portion 140, and L2 is the distance between the fuse portion 110 and the adjacent second narrow diameter portion 150.

[0068] like Figure 1 , Figure 2 , Figure 3 As shown, the distance between the fused portion 110 and the adjacent second narrow diameter portion 150 is greater than the distance between the fused portion 110 and the adjacent first narrow diameter portion 140. Typically, the distance between the fused portion 110 and the adjacent second narrow diameter portion 150 is greater than or equal to 5 times the distance between the fused portion 110 and the adjacent first narrow diameter portion 140.

[0069] As an example, the distance between the fusible portion 110 and the adjacent first narrow diameter portion 140 can be selected from 0.5mm to 4mm, and the distance between the fusible portion 110 and the adjacent second narrow diameter portion 150 can be selected from 5mm to 30mm.

[0070] In this embodiment, the distance between the fused portion 110 and the adjacent first narrow diameter portion 140 is 2mm, and the distance between the fused portion 110 and the adjacent second narrow diameter portion 150 is 15mm.

[0071] According to the embodiment of this application, the distance between the fuse portion 110 and the adjacent second narrow diameter portion 150 is greater than or equal to 5 times the distance between the fuse portion 110 and the adjacent first narrow diameter portion 140, which reduces the distance of the arc to burn to the positive electrode when the arc is ignited, and can quickly extinguish the arc and prevent the arc from deteriorating and burning at high temperature.

[0072] In some embodiments, such as Figure 2 , Figure 3 As shown, the fusible part 110 may be provided with a groove 111, and the inner wall of the groove 111 is provided with a melting layer 1111.

[0073] like Figure 2 , Figure 3 As shown, the fuse section 110 is disposed on the fuse body 100 at the first row of narrow diameters closer to the negative electrode. A groove 111 is provided at the fuse section 110, and the groove 111 is used to accommodate the molten layer 1111.

[0074] The melting layer 1111 is a metal material with a lower melting point than the fused portion 110. In this embodiment, tin metal is used as the melting layer 1111.

[0075] The molten layer 1111 can be made using various processing techniques, such as welding or coating the groove 111 of the molten part 110. In this embodiment, tin metal is used for welding.

[0076] When the current is overloaded, the molten layer 1111 will have a metallurgical effect with the groove 111, and the melting point of the fused part 110 will decrease, making it easier for it to melt and break.

[0077] According to the embodiment of this application, the fuse 100 is provided with a groove 111 in the fuse portion 110 and a melting layer 1111 is provided in the groove 111, so that the fuse portion 110 can reduce the melting point when the current is overloaded and fuse more quickly.

[0078] In some embodiments, such as Figure 2 , Figure 3 As shown, the groove 111 extends along the width direction of the fuse 100 to the edge of the fuse 100, and the end of the groove 111 may be provided with a heat-resistant plug 1112.

[0079] like Figure 1 , Figure 2 As shown, the groove 111 extends along the width direction of the fuse 100 to the edge of the fuse 100, which can increase the capacity of the melting layer 1111 in the groove 111 and increase the contact area between the melting layer 1111 and the fuse portion 110. When the current is overloaded, the melting point of the fuse portion 110 of more volume is lowered and it melts, which accelerates the melting speed of the fuse portion 110 and improves the safety of the fuse 100.

[0080] The end of the groove 111 is provided with a heat-resistant plug 1112, which is used to prevent the liquid melt layer 1111 from flowing out when the melt layer 1111 melts.

[0081] The heat-resistant plug 1112 can have various structural forms, and the heat-resistant plug 1112 should be made of high-temperature resistant material. In this embodiment, high-temperature resistant silicone is used as the heat-resistant plug 1112, and solder tin metal is used as the melting layer 1111. The melting point of tin metal is about 210°C, and the temperature resistance range of the high-temperature resistant silicone should be at least greater than 230°C. The high-temperature resistant silicone is connected to the openings at both ends of the groove 111, and the high-temperature resistant silicone stabilizes the liquid melting layer 1111.

[0082] High-temperature resistant silicone maintains stability and strength under high-temperature conditions and possesses excellent heat resistance. During the arc extinguishing process of the fusible link 100, the high temperature generated by the electric arc causes the surrounding materials to heat up rapidly. The high-temperature resistant silicone can effectively protect other components from the effects of high temperatures. In related technologies, after the temperature of the fusible link reaches the melting point of the molten layer, the molten layer will flow non-directionally, thus prolonging the melting time of the fusible link.

[0083] In this embodiment, the fusible part 110 is provided with heat-resistant plugs 1112 at both ends of the groove 111. After the molten layer 1111 reaches the melting point, the liquid molten layer 1111 is sealed in the groove 111 by the heat-resistant plugs 1112. The liquid molten layer 1111 and the fusible part 110 have a metallurgical effect, which accelerates the fusible part 110 from melting.

[0084] It should be noted that, taking the example of using tin metal as the melting layer 1111 and copper metal as the fuse part 110 in this embodiment, the metallurgical effect of the fuse body 100 means that when the fuse body 100 is overloaded, the tin metal of the melting layer 1111 melts first and wraps around the copper metal of the fuse part 110. At this time, copper and tin will interpenetrate to form a copper-tin alloy. The melting point of the copper-tin alloy is lower than that of copper, so that the fuse part 110 can melt at a lower temperature to achieve overload protection and improve the protection performance of the fuse body 100.

[0085] According to the embodiment of this application, the groove 111 of the fuse portion 110 extends along the width direction of the fuse 100 to the edge of the fuse 100, and a heat-resistant plug 1112 is provided at the end of the groove 111 to prevent the liquid melt layer 1111 from flowing out. At the same time, when the arc is ignited, the heat-resistant plug 1112 can effectively protect other components from high temperature.

[0086] In some embodiments, the side surface of the molten layer 1111 away from the groove 111 is provided with an adhesion layer.

[0087] The adhesive layer can be a heat-resistant adhesive such as silicone or fluoropolymer.

[0088] In this embodiment, an adhesive silicone layer is applied or covered on the melting layer 1111. When a low fault current occurs, the melting layer 1111 begins to melt. The silicone layer prevents the melted melting layer 1111 from flowing arbitrarily, thus shortening the melting time of the fuse section 110. When the fuse section 110 functions, a gap is generated and an arc is formed. At the same time, the silicone layer absorbs heat and carbonizes, generating gas, which serves as the first arc-extinguishing barrier.

[0089] According to the embodiment of this application, the fuse 100 provides an adhesion layer on the molten layer 1111 to ensure that the molten layer 1111 does not flow arbitrarily after melting while extinguishing the arc.

[0090] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, both the first narrow diameter portion 140 and the second narrow diameter portion 150 may be provided with a plurality of hollow holes 141 arranged along the width direction of the fuse 100.

[0091] like Figure 1 , Figure 2 , Figure 3 As shown, the structure with multiple perforated holes 141 can reduce the cross-sectional area at the first narrow diameter portion 140 and the second narrow diameter portion 150, so that the first narrow diameter portion 140 and the second narrow diameter portion 150 can be melted quickly. The fuse body 100 can quickly cut off the circuit, thereby disconnecting the series external circuit and ensuring the melting speed.

[0092] The perforated holes 141 provided at the first narrow diameter portion 140 and the second narrow diameter portion 150 ensure that if the current exceeds the safe value and the arc is still burning after the fuse portion 110 melts, the first narrow diameter portion 140 and the second narrow diameter portion 150 on both sides of the fuse portion 110 can melt quickly. At the same time, because multiple perforated holes 141 are provided at the first narrow diameter portion 140 and the second narrow diameter portion 150, less metal vapor is generated when the arc is started, and the arc is extinguished better.

[0093] It is understood that the hollow hole 141 can be set as a hole of various shapes, such as a round hole 1411, a rectangular hole, a hexagonal hole, an octagonal hole, etc. In this embodiment, the hollow hole 141 is a round hole 1411.

[0094] The perforated hole 141 can be made using processes such as punching.

[0095] According to the embodiment of this application, the fuse 100 is provided with a plurality of hollow holes 141 along the width direction of the fuse 100 in both the first narrow diameter portion 140 and the second narrow diameter portion 150, thereby reducing the cross-sectional area of ​​the first narrow diameter portion 140 and the second narrow diameter portion 150 and reducing the metal material in the first narrow diameter portion 140 and the second narrow diameter portion 150, thus reducing arcing while rapidly fusing.

[0096] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, the plurality of hollow holes 141 at the first narrow diameter portion 140 and the second narrow diameter portion 150 may each include a round hole 1411 and an arc-shaped notch 1412 provided at the edge of the fuse 100.

[0097] like Figure 1 , Figure 2 , Figure 3 As shown, the structure of providing a circular hole 1411 at the first narrow diameter portion 140 and the second narrow diameter portion 150 can reduce the cross-sectional area at the first narrow diameter portion 140 and the second narrow diameter portion 150, and heat can be concentrated at the first narrow diameter portion 140 and the second narrow diameter portion 150 to reach the melting point and thus melt quickly.

[0098] Meanwhile, because the first narrow section 140 and the second narrow section 150 are provided with circular holes 1411, the amount of metal material is reduced, less metal vapor is generated when the arc is started, and the electric arc is extinguished better.

[0099] The arc-shaped notch 1412 is located at the edge of the fuse body 100, that is, the arc-shaped notch 1412 is located on both sides of the first narrow diameter portion 140 and the second narrow diameter portion 150. The arc-shaped notch 1412 is located on both sides of the first narrow diameter portion 140 and the second narrow diameter portion 150 to ensure that both sides melt simultaneously when the first narrow diameter portion 140 and the second narrow diameter portion 150 melt, resulting in a better melting effect, less metal vapor when the arc is ignited, and better arc extinguishing.

[0100] The circular hole 1411 and the arc-shaped notch 1412 are spaced apart along the width direction of the fuse body 100. At the same time, the arc-shaped notch 1412 is provided on both sides of the first narrow diameter portion 140 and the second narrow diameter portion 150 to ensure the flow capacity of the fuse body 100.

[0101] It should be noted that the flow resistance of the fuse 100 is positively correlated with the cross-sectional area of ​​the first narrow diameter portion 140 and the second narrow diameter portion 150. The larger the cross-sectional area, the stronger the flow resistance and the smaller the temperature rise during normal flow. The size of the circular hole 1411 and the arc-shaped notch 1412 are set according to the flow requirements. The cross-sectional area of ​​the first narrow diameter portion 140 cannot be reduced indefinitely, that is, the diameter of the circular hole 1411 cannot be too large.

[0102] According to the embodiment of this application, the fuse 100 provides a circular hole and an arc-shaped notch 1412 at the first narrow diameter portion 140 and the second narrow diameter portion 150. When the arc is still burning after the fuse portion 110 melts, the first narrow diameter portion 140 and the second narrow diameter portion 150 can melt quickly. The first narrow diameter portion 140 and the second narrow diameter portion 150 have less metal material, less metal vapor when the arc is started, and the arc is extinguished better.

[0103] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, the fuse element 100 may include a bent section 160.

[0104] like Figure 1 , Figure 2 , Figure 3 As shown, the fuse 100 includes a plurality of bent sections 160, and a receiving groove 161 for receiving insulating medium is formed between each bent section 160.

[0105] The 160-degree bend can have various structures, such as V-shaped bends, right-angle bends, and arc bends, etc. Figure 1 , Figure 2 , Figure 3 As shown, this embodiment uses alternating V-shaped bends and right-angle bends.

[0106] A receiving groove 161 is formed between each bending section 160 on the fuse element 100. The receiving groove 161 is used to receive the insulating medium.

[0107] It should be noted that the insulating medium in this embodiment is quartz sand.

[0108] When the fuse element 100 melts and the arc is ignited, the arc burns towards the first narrow diameter portion 140 and the second narrow diameter portion 150 on both sides of the fuse element 110. The receiving groove 161 contains the insulating medium to insulate the arc. Furthermore, the fuse element 100 extends the arc burning distance through the bending section 160, which can quickly extinguish the arc.

[0109] According to the embodiment of this application, the fuse 100 is provided with multiple bending sections 160 to extend the arc burning distance, and the receiving groove 161 formed by the bending section 160 contains the insulating medium to insulate and extinguish the arc.

[0110] In some embodiments, such as Figure 1 , Figure 2 , Figure 3As shown, the fuse element 100 is made of copper metal. A fuse portion 110 is provided on the fuse element 100 at a position of the first narrow diameter portion 140 near the negative electrode. The fuse portion 110 has a groove 111, and the inner wall of the groove 111 is provided with a tin metal molten layer 1111. Heat-resistant plugs 1112 are provided at the openings at both ends of the groove 111. The fuse portion 110 has seven first narrow diameter portions 140 near the negative electrode and seven second narrow diameter portions 150 near the positive electrode. Each... Both the first narrow section 140 and the second narrow section 150 are provided with a circular hole 1411 and an arc-shaped notch 1412 located at the edge of the fuse body 100. The circular hole 1411 and the arc-shaped notch 1412 are spaced apart along the width direction of the fuse body 100. The fuse body 100 includes multiple bending sections 160 with alternating V-shaped bends and right-angle bends. Each bending section 160 forms a receiving groove 161 for receiving an insulating medium. The receiving groove 161 and the area around the fuse body 100 are covered with quartz sand as an insulating medium.

[0111] When the fuse 100 is overloaded, the molten tin layer 1111 in the groove 111 of the fuse portion 110 melts first. The heat-resistant plug 1112 prevents the molten tin from flowing out of the groove 111. The molten tin reacts with the copper in the fuse portion 110, causing the melting point of the fuse portion 110 to decrease, resulting in melting and arcing. The arc burns towards the first narrow diameter portions 140 and the second narrow diameter portions 150 on both sides of the fuse portion 110. The quartz sand in the first narrow diameter portions 140 and the second narrow diameter portions 150 absorbs the heat from the arc. If the arc is not completely extinguished, the first narrow diameter portion 140 and the second narrow diameter portion 150 on both sides of the fuse portion 110 will melt and the arc will continue to burn to both sides. There are bending sections 160 between the first narrow diameter portion 140 and the second narrow diameter portion 150 and the second narrow diameter portion 140 and the second narrow diameter portion 150 respectively. The quartz sand in the receiving groove 161 formed at the bending section 160 continues to extinguish the arc. If the arc is not completely extinguished, it continues to burn to the bending sections 160 on both sides until the arc is extinguished and insulation is established.

[0112] It should be noted that tin has a melting point of approximately 210°C. Over time, the temperature of the fuse 100 rises to the melting point of tin, and tin and copper form an alloy. This causes the melting point of pure copper melt to drop sharply from 1080°C to about 450°C for the copper-tin alloy. As current flows through the fuse 100, the temperature continues to rise, and the metal begins to vaporize. This vaporization eventually leads to melting and arc initiation. The arc burns to both sides, and the quartz sand on both sides quickly absorbs the heat of the arc, performing the first step of arc extinguishing. If the arc continues to burn, it enters the bending section 160. The quartz sand in the receiving groove 161 at the bending section 160 blocks the arc, performing the second step of arc extinguishing. If the arc continues to burn, the quartz sand in the receiving groove 161 at the bending sections 160 on both sides continues to extinguish the arc until the arc is extinguished and insulation is established.

[0113] According to the embodiment of this application, the fuse 100 is provided with a fuse portion 110, a first narrow diameter portion 140 and a second narrow diameter portion 150, which can perform multiple rounds of arc extinguishing when the fuse is broken, and the arc extinguishing effect is good.

[0114] This application also provides a fuse 1000.

[0115] like Figure 4 As shown, the fuse 1000 includes: a first terminal 200, a second terminal 300, and a fuse element 100.

[0116] The first terminal 200 is connected to the first end 120 of the fuse 100, and the second terminal 300 is connected to the second end 130 of the fuse 100.

[0117] The fuse 100 is the fuse 100 of the above embodiment, and the first terminal 200 and the second terminal 300 are respectively connected to the first end 120 and the second end 130 of the fuse 100.

[0118] In this embodiment, the first terminal 200 and the second terminal 300 are used to connect the fuse 100 into the circuit during normal operation.

[0119] The opposite ends of the first terminal 200 and the second terminal 300 are used for electrical connection with an external circuit, and the opposite ends of the first terminal 200 and the second terminal 300 are used for electrical connection with the fuse 100. The first terminal 200 and the second terminal 300 can be made of the same material.

[0120] The first terminal 200 and the second terminal 300 can be made of materials with good conductivity and wear resistance, such as copper or silver. In this embodiment, copper is selected as the material for the first terminal 200 and the second terminal 300.

[0121] In some embodiments, a spring mechanism may also be provided at the first terminal 200 and the second terminal 300 to ensure good contact pressure between the first terminal 200 and the second terminal 300 when the fuse 1000 is closed.

[0122] In this embodiment, the fuse 1000 can be a gPV / 2000VDC / 150mm fuse, and the fuse body 100 adopts 7 rows of first narrow diameter portions 140 and second narrow diameter portions 150 on each side of the fuse portion 110.

[0123] The fuse 1000 can also be a fuse for other voltages. The number of the first narrow section 140 and the second narrow section 150 is positively correlated with the voltage. For example, the gPV / 1500VDC fuse uses 5 rows of the first narrow section 140 and the second narrow section 150 on each side of the fuse section 110.

[0124] According to the embodiment of this application, the fuse 1000 is formed by connecting the first terminal 200 and the second terminal 300 to the first end 120 and the second end 130 of the fuse body 100, respectively, to form a fuse 1000 that can be connected to the circuit and protect the circuit.

[0125] In some embodiments, the fuse 1000 may further include a housing 400.

[0126] like Figure 4 As shown, the first terminal 200 and the second terminal 300 are respectively installed at both ends of the housing 400 to form a sealed structure, and the fuse 100 is located inside the housing 400.

[0127] The connection between the first terminal 200 and the second terminal 300 and the two ends of the housing 400 can be achieved by threaded connection, riveting, or snap-fit.

[0128] The outer structure of the shell 400 can be a cylindrical structure, a cuboid structure, or other shapes. In this embodiment, a cylindrical structure is adopted. The shell 400 has openings at both ends and a hollow cavity in the middle.

[0129] The fuse 100 is installed in the hollow cavity of the housing 400, and the first end 120 and the second end 130 of the fuse 100 are respectively connected to the first terminal 200 and the second terminal 300 through the openings at both ends of the housing 400.

[0130] The housing 400 can be made of ceramic, fiberglass, carbon fiber, plastic, rubber, etc., to provide insulation.

[0131] The housing 400 is filled with an insulating medium.

[0132] It is understood that in this embodiment, the insulating medium is an insulating medium that fills the hollow cavity of the housing 400 and covers the fuse 100.

[0133] According to the embodiment of this application, the fuse 1000 can be more safely connected to the circuit and operate by placing the fuse element 100 inside the housing 400 and placing the insulating medium inside the hollow cavity of the housing 400.

[0134] This application also provides an electrical device.

[0135] The electrical device includes: fuse 1000.

[0136] The fuse 1000 is the fuse 1000 described in the above embodiment.

[0137] Electrical devices can include battery packs, energy storage cabinets, vehicles, etc.

[0138] According to the embodiment of this application, the electrical device is connected to the fuse 1000. When the current of the electrical device exceeds the set current, the fuse 1000 will quickly melt and break. When the fuse 1000 starts to arc, the arc can be controlled within the fuse 1000 housing 400 and quickly extinguished, thereby improving the safety of the electrical device and reducing the manufacturing cost of the electrical device.

[0139] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0140] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0141] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0142] In the description of this application, "multiple" means two or more.

[0143] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0144] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0145] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0146] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A fusible body for a fuse, characterized by, The fuse body has a melting portion, a first end for connecting with a negative electrode, and a second end for connecting with a positive electrode, the fuse body is provided with a first narrow portion between the melting portion and the first end, the fuse body is provided with a second narrow portion between the melting portion and the second end, and the distance between the melting portion and the adjacent first narrow portion is less than the distance between the melting portion and the adjacent second narrow portion.

2. The fuse body of claim 1, wherein The following conditions are met: L2 / L1≥5, L1 is the distance between the melting portion and the adjacent first narrow portion, and L2 is the distance between the melting portion and the adjacent second narrow portion.

3. The fuse body of claim 1, wherein The melting portion is provided with a groove, and the inner wall of the groove is provided with a melting layer.

4. The fuse body of claim 3, wherein The groove extends along the width direction of the fuse body to the edge of the fuse body, and the end of the groove is provided with a heat-resistant plug.

5. The fuse body of claim 3, wherein The side surface of the melting layer away from the groove is provided with an adhesion layer.

6. The fuse body of claim 1, wherein The first narrow portion and the second narrow portion are each provided with a plurality of hollow holes arranged along the width direction of the fuse body.

7. The fuse body of claim 6, wherein The plurality of hollow holes at the first narrow portion and the second narrow portion each include a circular hole and an arc-shaped notch arranged at the edge of the fuse body.

8. The fuse body of any one of claims 1-7, wherein, The fuse body includes a plurality of bending sections, and a containing groove for containing an insulating medium is formed between each of the bending sections.

9. A fuse, characterized in that It comprises: a first terminal; a second terminal; the fuse body according to any one of claims 1-8; wherein, the first terminal and the second terminal are respectively connected to the first end and the second end of the fuse body.

10. The fuse of claim 9, wherein It further comprises: a housing, the fuse body is located in the housing, and the housing is filled with an insulating medium.

11. An electrical device, comprising: It comprises: the fuse according to claim 9 or 10.

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