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, the two sides of the fusing part of the fuse link are respectively provided with at least one first narrow-diameter part, a second narrow-diameter part is arranged between the fusing part and the adjacent first narrow-diameter part, and the length of the second narrow-diameter part is larger than that of the first narrow-diameter part. The length of the second narrow-diameter parts is larger than that of the first narrow-diameter parts, metal materials at the second narrow-diameter parts are few, when current is overloaded, the fusing part is fused firstly, the second narrow-diameter parts located on the two sides of the fusing part are also fused, the fusing part and the second narrow-diameter parts are in arcing, and due to the fact that the second narrow-diameter parts are long and metal materials are few, the fusing part and the second narrow-diameter parts are in arcing. The metal vapor generated during fusing is less, arc extinguishing is facilitated, and the second narrow-diameter part is longer and more arc extinguishing materials are arranged at the second narrow-diameter part, so that arc extinguishing can be performed quickly, and the electric arc is prevented from worsening and burning at high temperature.

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. However, existing fuses are relatively expensive, and during use, the fuse casing may be penetrated by an electric arc, making arc extinguishing difficult and posing 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 body, comprising: a fuse portion, wherein the fuse body has at least one first narrow diameter portion on each side of the fuse portion, and a second narrow diameter portion is provided between the fuse portion and the adjacent first narrow diameter portion, wherein the length of the second narrow diameter portion is greater than that of the first narrow diameter portion.

[0005] According to the fuse of this application, by providing a longer second narrow diameter portion on both sides of the fuse portion, metal vaporization can be reduced and arc extinguishing can be achieved quickly.

[0006] According to one embodiment of this application, the following condition is satisfied: L2 / L1≥1.5, where L1 is the length of the first narrow section and L2 is the length of the second narrow section.

[0007] According to the fuse of this application, the length of the second narrow section on both sides of the fuse portion is greater than 1.5 times the length of the first narrow section. Increasing the arc-extinguishing material in the second narrow section and reducing the metal material in the second narrow section can extinguish the arc more quickly and prevent the arc from deteriorating and burning at high temperature.

[0008] According to one embodiment of this application, the second narrow section is provided with an elongated hole.

[0009] According to the fuse of this application, the elongated hole at the second narrow diameter can reduce the amount of metal material at the second narrow diameter, and can extinguish the arc more quickly when the fuse is ignited, preventing the arc from deteriorating and burning at high temperature.

[0010] According to one embodiment of this application, the second narrow portion has an elongated notch at its edge, and the elongated hole and the elongated notch are spaced apart along the width direction of the fuse body.

[0011] According to the fuse of this application, by providing an elongated notch at the edge of the second narrow section, and by spaced the elongated hole and the elongated notch along the width direction of the fuse, the current carrying capacity of the fuse is ensured while the cross-sectional area of ​​the second narrow section is reduced to the maximum extent. There is less metal material in the second narrow section, less metal vapor when the arc is ignited, and the arc is extinguished better.

[0012] According to one embodiment of this application, the cross-sectional area of ​​the second narrow diameter is smaller than the cross-sectional area of ​​the first narrow diameter. According to one embodiment of this application, the first narrow diameter is provided with a circular hole.

[0013] According to the fuse of this application, by providing a circular hole at the first narrow diameter portion, the first narrow diameter portion can be quickly melted while the arc is still burning after the second narrow diameter portion melts, resulting in less metal vapor during arc initiation and better arc extinguishing.

[0014] According to one embodiment of this application, the first narrow portion has an arc-shaped notch at its edge, and the arc-shaped notch and the circular hole are spaced apart along the width direction of the fuse body.

[0015] According to the fuse of this application, by setting an arc-shaped notch at the edge of the first narrow section, and the arc-shaped notch and the circular hole are spaced apart along the width direction of the fuse, the current carrying capacity of the fuse is ensured while the cross-sectional area of ​​the first narrow section is reduced to the maximum extent. There is less metal material in the first narrow section, less metal vapor when the arc is started, and the arc is extinguished better.

[0016] 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.

[0017] 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 exceeds the safe value, and fuse more quickly.

[0018] According to one embodiment of this application, a sealing mechanism is further included, the sealing mechanism being disposed at the openings on both sides of the groove. In a second aspect, this application provides a fuse, the fuse comprising:

[0019] First terminal;

[0020] Second terminal;

[0021] The fuse as described in the above embodiments; wherein...

[0022] The first terminal and the second terminal are respectively connected to the opposite ends of the fuse.

[0023] According to the fuse of this application, by connecting a first terminal and a second terminal to both ends of the fuse body, a fuse that can be connected into a circuit is formed to protect the circuit.

[0024] According to one embodiment of this application, it further includes: a housing, wherein the first terminal and the second terminal are respectively mounted at both ends of the housing, and the fuse is located inside the housing, and satisfies:

[0025] 0.5A+T1+T2<0.5D, where A is the width of the fuse, T1 is the width tolerance of the fuse, T2 is the welding tolerance of the fuse, and D is the inner diameter of the shell.

[0026] According to the fuse of this application, by reducing the width of the fuse element and increasing the inner diameter of the fuse housing, the width of the fuse element is controlled to be smaller than the inner diameter of the housing even with width tolerance and welding tolerance. This achieves the goal of controlling the extinction of the fuse element's arc within the housing, thereby reducing the probability of the housing temperature rising due to the rise in fuse element temperature and the probability of the housing burning through during arc initiation.

[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, the fuse will melt when the electrical device exceeds the set current, and 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 a schematic diagram of the structure of the fuse provided in the embodiment of this application;

[0035] Figure 4 This is a cross-sectional view of the fuse provided in the embodiment of this application;

[0036] Figure 5This is a partial enlarged view of the fuse provided in the embodiments of this application.

[0037] Figure label:

[0038] Fuse 1000;

[0039] Fuse element 100;

[0040] Fusible section 110, groove 111, molten layer 1111;

[0041] First narrow section 120, circular hole 121, arc notch 122;

[0042] Second narrow section 130, elongated hole 131, elongated notch 132;

[0043] First terminal 200;

[0044] Second terminal 300;

[0045] 400 for the casing. Detailed Implementation

[0046] 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.

[0047] The principle by which the fuse 100 proposed in this application achieves the above-mentioned beneficial effects will be explained in detail below:

[0048] In related technologies, the narrow diameters on both sides of the fuse section are the same as the narrow diameters at other locations of the fuse body, resulting in a large area of ​​metal at the narrow diameters on both sides of the fuse section, making arc extinguishing difficult and posing a safety hazard.

[0049] 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.

[0050] like Figure 1 , Figure 2 As shown, the fuse 100 in this embodiment includes: a fuse portion 110, a first narrow diameter portion 120, and a second narrow diameter portion 130.

[0051] The fuse element 110 is located on the fuse body 100 and is used to melt first when the current exceeds the safe value.

[0052] 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.

[0053] 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.

[0054] The fusible part 110 can typically be made of materials such as tin, zinc, tin-lead alloy, or tin-cadmium alloy.

[0055] In this embodiment, the fusible part 110 is made of tin metal, which has a lower melting point than copper metal.

[0056] like Figure 1 , Figure 2 As shown, the fuse body 100 has at least one first narrow diameter portion 120 on each side of the fuse portion 110.

[0057] The number of the first narrow section 120 is selected according to parameters such as circuit voltage and current.

[0058] A second narrow section 130 is provided between the fused section 110 and the adjacent first narrow section 120, and the length of the second narrow section 130 is greater than that of the first narrow section 120.

[0059] The second narrow section 130 is used to melt and break together with the fuse section 110. The length of the second narrow section 130 is greater than that of the first narrow section 120, which extends the burning distance at the second narrow section 130. The arc-extinguishing material at the second narrow section 130 absorbs the heat of the electric arc and quickly extinguishes the arc.

[0060] It should be noted that the arc-extinguishing material can be quartz sand, specific gases, arc-extinguishing oil, chlorides, and composite materials, etc. In this embodiment, quartz sand is used as the arc-extinguishing material.

[0061] The first narrow section 120 and the second narrow section 130 can process metal materials into the required shapes and sizes through processes such as drawing and stamping.

[0062] In related technologies, the narrow diameters on both sides of the fuse section are the same as the narrow diameters at other locations of the fuse body, resulting in a large area of ​​metal at the narrow diameters on both sides of the fuse section. This makes it difficult to extinguish the arc when the current of the fuse body is overloaded, posing a safety hazard.

[0063] In this embodiment, the second narrow diameter portion 130 is longer than the first narrow diameter portion 120. The second narrow diameter portion 130 contains less metal material. When the current in the fuse 100 is overloaded, the fuse portion 110 melts first, and an arc is initiated at the fuse portion 110. The arc-extinguishing material in the second narrow diameter portion 130 extinguishes the arc. If the arc is not completely extinguished, the arc burns the second narrow diameter portions 130 located on both sides of the fuse portion 110, causing the second narrow diameter portions 130 to also melt. Because the second narrow diameter portion 130 is longer and contains less metal material, less metal vapor is generated during melting, which is beneficial. The arc is extinguished quickly because the second narrow section 130 is longer and contains more arc-extinguishing material, preventing the arc from deteriorating and burning at high temperatures. If the arc is not completely extinguished, the second narrow sections 130 on both sides of the fuse section 110 melt and the arc continues to burn to both sides. The arc-extinguishing material at the first narrow section 120 forms a spindle shape with the first narrow section 120, and the arc-extinguishing material at the first narrow section 120 continues to extinguish the arc. The first narrow sections 120 on both sides of the fuse section 110 begin to melt and burn until the arc is extinguished, thus establishing insulation.

[0064] According to the embodiment of this application, the fuse 100 has a long second narrow diameter portion 130 on both sides of the fuse portion 110, which can reduce metal vaporization and quickly extinguish the arc.

[0065] In some embodiments, the fuse 100 may satisfy: L2 / L1≥1.5, where L1 is the length of the first narrow diameter portion 120 and L2 is the length of the second narrow diameter portion 130.

[0066] like Figure 1 , Figure 2 As shown, the length of the second narrow diameter portion 130 on both sides of the fuse portion 110 is greater than the length of the first narrow diameter portion 120. Typically, the length of the second narrow diameter portion 130 is greater than or equal to 1.5 times the length of the first narrow diameter portion 120.

[0067] As an example, the length of the first narrow section 120 can be selected from 0.5-1mm, and the length of the second narrow section 130 can be selected from 1mm-4mm.

[0068] In this embodiment, a fuse 100 with a first narrow diameter portion 120 having a length of 0.8 mm and a second narrow diameter portion 130 having a length of 3 mm is used.

[0069] According to the embodiment of this application, the length of the second narrow diameter portion 130 on both sides of the fuse portion 110 is greater than 1.5 times the length of the first narrow diameter portion 120. By increasing the arc-extinguishing material at the second narrow diameter portion 130 and reducing the metal material at the second narrow diameter portion 130, the arc can be extinguished more quickly, preventing the arc from deteriorating and burning at high temperature.

[0070] In some embodiments, such as Figure 1 , Figure 2 As shown, the second narrow section 130 may be provided with an elongated hole 131.

[0071] The cross-sectional shape of the elongated hole 131 can be circular, rectangular, or oblong.

[0072] The elongated hole 131 of the second narrow section 130 can be made by processes such as punching.

[0073] According to the embodiment of this application, the elongated hole 131 provided at the second narrow diameter portion 130 can reduce the amount of metal material at the second narrow diameter portion 130, and can extinguish the arc more quickly when the fuse 100 starts to burn, preventing the arc from deteriorating and burning at high temperature.

[0074] In some embodiments, such as Figure 1 , Figure 2 As shown, the second narrow section 130 has an elongated notch 132 at its edge.

[0075] like Figure 1 , Figure 2 As shown, the elongated notch 132 can be provided on both sides of the second narrow diameter portion 130. In some embodiments, the elongated notch 132 can also be provided on one side of the second narrow diameter portion 130.

[0076] like Figure 1 , Figure 2 As shown, in this embodiment, an elongated notch 132 is selected and set on both sides of the second narrow diameter portion 130. The elongated notch 132 is set on both sides of the second narrow diameter portion 130 to ensure that both sides melt simultaneously when the second narrow diameter portion 130 melts, resulting in a better melting effect, less metal vapor when the arc is started, and better arc extinguishing.

[0077] It should be noted that the flow resistance of the fuse 100 is positively correlated with the cross-sectional area of ​​the second narrow section 130. The larger the cross-sectional area, the stronger the flow resistance and the smaller the temperature rise during normal flow. The size of the elongated notch 132 is set according to the flow requirements, and the cross-sectional area of ​​the second narrow section 130 cannot be reduced indefinitely.

[0078] The elongated holes 131 and elongated notches 132 are spaced apart along the width direction of the fuse body 100.

[0079] The elongated holes 131 and elongated notches 132 are spaced apart along the width direction of the fuse 100 to ensure the flow capacity of the fuse 100.

[0080] In some embodiments, other structural designs may be used to make the cross-sectional area of ​​the second narrow section smaller than that of the first narrow section.

[0081] According to the embodiment of this application, the fuse 100 is provided with an elongated notch 132 at the edge of the second narrow section 130, and the elongated hole 131 and the elongated notch 132 are spaced apart along the width direction of the fuse 100. This ensures the current carrying capacity of the fuse 100 while minimizing the cross-sectional area of ​​the second narrow section 130. The second narrow section 130 has less metal material, less metal vapor when the arc is ignited, and the arc is extinguished better.

[0082] In some embodiments, the first narrow section 120 may be provided with a circular hole 121.

[0083] The first narrow section 120 may be provided with one or more circular holes 121 along the width direction of the fuse 100, and the circular holes 121 of two adjacent first narrow sections 120 are used for current flow.

[0084] The first narrow section 120 having a circular hole 121 can be in at least one of the following structural forms:

[0085] Firstly, such as Figure 1 , Figure 2 As shown, when each first narrow section 120 is provided with a circular hole 121 along the width direction of the fuse body 100, the circular holes 121 are spaced apart along the length direction of the fuse body 100.

[0086] The structure with a circular hole 121 can reduce the cross-sectional area at the first narrow section 120, and the heat can be concentrated at the first narrow section 120 to reach the melting point, thereby melting and breaking quickly.

[0087] The circular hole 121 provided at the first narrow section 120 ensures that if the arc continues to burn after the second narrow section 130 melts when the current exceeds the safe value, the first narrow section 120 can melt quickly, and the fuse 100 can quickly cut off the circuit, thereby disconnecting the series external circuit and ensuring the melting speed. At the same time, because the circular hole 121 is provided at the first narrow section 120, there is less metal vapor when the arc is started, and the arc is extinguished better.

[0088] Secondly, when each first narrow section 120 is provided with multiple circular holes 121 along the width direction of the fuse body 100, the circular holes 121 at each first narrow section 120 are a row of circular holes 121, and each row of circular holes 121 is spaced apart along the length direction of the fuse body 100.

[0089] The structure with multiple rows of circular holes 121 can reduce the cross-sectional area of ​​the first narrow section 120, allowing the first narrow section 120 to melt quickly. The fuse body 100 can quickly cut off the circuit, thereby disconnecting the series-connected external circuit and ensuring the melting speed.

[0090] The circular hole 121 at the first narrow section 120 can ensure that if the arc is still burning after the second narrow section 130 melts when the current exceeds the safe value, the first narrow section 120 can melt quickly. At the same time, because multiple rows of circular holes 121 are provided at the first narrow section 120, there is less metal vapor when the arc is started, and the arc is extinguished better.

[0091] It is understood that the circular hole 121 described above is exemplary, and the first narrow diameter portion 120 may also be provided with other polygonal holes, such as rectangular holes, hexagonal holes, octagonal holes, etc.

[0092] According to the embodiment of this application, the fuse 100 provides a circular hole 121 at the first narrow diameter portion 120. When the arc is still burning after the second narrow diameter portion 130 is melted, the first narrow diameter portion 120 can be melted quickly. The first narrow diameter portion 120 has less metal material, less metal vapor when the arc is started, and the arc is extinguished better.

[0093] In some embodiments, the first narrow section 120 may have an arc-shaped notch 122 at its edge.

[0094] like Figure 1 , Figure 2 As shown, the arc-shaped notch 122 can be provided on both sides of the first narrow diameter portion 120. In some embodiments, the arc-shaped notch 122 can also be provided on one side of the first narrow diameter portion 120.

[0095] like Figure 1 , Figure 2 As shown, in this embodiment, the arc-shaped notch 122 is selected to be set on both sides of the first narrow diameter portion 120. The arc-shaped notch 122 is set on both sides of the first narrow diameter portion 120 to ensure that both sides melt simultaneously when the first narrow diameter portion 120 melts, resulting in a better melting effect, less metal vapor when the arc is started, and better arc extinguishing.

[0096] The arc-shaped notch 122 and the circular hole 121 are spaced apart along the width direction of the fuse body 100.

[0097] The arc-shaped notch 122 and the circular hole 121 are spaced apart along the width direction of the fuse 100 to ensure the flow capacity of the fuse 100.

[0098] It should be noted that the flow resistance of the fuse 100 is positively correlated with the cross-sectional area of ​​the first narrow section 120. The larger the cross-sectional area, the stronger the flow resistance and the smaller the temperature rise during normal flow. The size of the arc-shaped notch 122 is set according to the flow requirements, and the cross-sectional area of ​​the first narrow section 120 cannot be reduced indefinitely.

[0099] The second narrow section 130 is provided with an elongated hole 131 and an elongated notch 132, and the first narrow section 120 is provided with a circular hole 121 and an arc-shaped notch 122. The cross-sectional area of ​​the second narrow section 130 is smaller than that of the first narrow section 120 to ensure that the second narrow section 130 can melt before the first narrow section 120. The second narrow section 130 melts first, and then the first narrow section 120 melts, which can ensure better breaking ability.

[0100] According to the embodiment of this application, the fuse 100 is provided with an arc-shaped notch 122 at the edge of the first narrow diameter portion 120, and the arc-shaped notch 122 and the circular hole 121 are spaced apart along the width direction of the fuse 100. This ensures the current carrying capacity of the fuse 100 while minimizing the cross-sectional area of ​​the first narrow diameter portion 120. The first narrow diameter portion 120 has less metal material, less metal vapor when the arc is ignited, and the arc is extinguished better.

[0101] In some embodiments, such as Figure 5 As shown, the fusible part 110 is provided with a groove 111, and the inner wall of the groove 111 is provided with a molten layer 1111.

[0102] like Figure 1 , Figure 2 , Figure 5 As shown, the fuse section 110 is located in the middle of the fuse body 100, and a groove 111 is provided at the fuse section 110. The groove 111 is used to accommodate the molten layer 1111.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] In some embodiments, a sealing mechanism may also be provided at the openings on both sides of the groove 111. The sealing mechanism is used to prevent the liquid melt layer 1111 from flowing out when the melt layer 1111 melts.

[0107] The sealing mechanism can take many forms. In this embodiment, high-temperature resistant silicone is used as the sealing mechanism. The high-temperature resistant silicone is connected to the openings at both ends of the groove 111 and stabilizes the liquid melt layer 1111.

[0108] The sealing mechanism should be made of high-temperature resistant materials. For example, in this embodiment, tin metal is used as the melting layer 1111. The melting point of tin metal is about 210°C. The temperature resistance range of high-temperature resistant silicone should be at least greater than 230°C.

[0109] High-temperature resistant silicone can maintain stability and strength under high temperature conditions, and it also has excellent heat resistance. During the arc extinguishing process of the fuse 100, the high temperature generated by the electric arc will cause the surrounding materials to heat up rapidly. High-temperature resistant silicone can effectively protect other components from the effects of high temperature.

[0110] 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.

[0111] 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.

[0112] In some embodiments, such as Figure 1 , Figure 2 , Figure 5 As shown, the fuse 100 is made of copper metal. A fuse portion 110 is located in the middle of the fuse 100. 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. Five first narrow diameter portions 120 are provided on each side of the fuse portion 110. A second narrow diameter portion 130 is provided between the fuse portion 110 and the adjacent first narrow diameter portion 120. The length of the second narrow diameter portion 130 is greater than that of the first narrow diameter portion 120, and the second narrow diameter portion 130 has a long strip... The second narrow section 130 has elongated notches 132 on both sides of the hole 131. The elongated holes 131 and elongated notches 132 are spaced apart along the width direction of the fuse body 100. Each first narrow section 120 has a circular hole 121. The first narrow section 120 has arc-shaped notches 122 on both sides of the hole 121. The arc-shaped notches 122 and circular holes 121 are spaced apart along the width direction of the fuse body 100. The fuse body 100 is covered with quartz sand as an arc-extinguishing material.

[0113] When the current of the fuse 100 is overloaded, the molten tin metal layer 1111 provided in the groove 111 of the fuse part 110 melts first. The molten tin metal and the copper metal of the fuse part 110 undergo a metallurgical effect, the melting point of the fuse part 110 decreases, the fuse is broken and an arc is ignited. The arc burns to both sides of the fuse part 110. The quartz sand at the second narrow diameter 130 absorbs the arc heat and extinguishes the arc. If the arc is not completely extinguished, the second narrow diameter 130 on both sides of the fuse part 110 melts, the arc continues to burn to both sides, the quartz sand at the first narrow diameter 120 continues to extinguish the arc, and the first narrow diameter 120 on both sides of the fuse part 110 begins to melt until the arc is extinguished and insulation is established.

[0114] It should be noted that the melting point of tin is approximately 210℃. 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℃ to about 450℃, the temperature of 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 arcing. 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 second narrow section 130. The quartz sand around the second narrow section 130 forms a spindle shape with the second narrow section 130, blocking the arc and performing the second step of arc extinguishing. If the arc continues to burn, the quartz sand in the first narrow sections 120 on both sides continues to extinguish the arc until the arc is extinguished and insulation is established.

[0115] According to the embodiment of this application, the fuse 100 is provided with a fuse portion 110, a first narrow diameter portion 120 and a second narrow diameter portion 130, which can perform multiple rounds of arc extinguishing when the fuse is broken, and the arc extinguishing effect is good.

[0116] This application also provides a fuse 1000.

[0117] like Figure 3 , Figure 4 As shown, the fuse 1000 includes: a first terminal 200, a second terminal 300, and a fuse element 100.

[0118] The first terminal 200 is connected to one end of the fuse 100, and the second terminal 300 is connected to the other end of the fuse 100.

[0119] 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 opposite ends of the fuse 100.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] According to the embodiment of this application, the fuse 1000 is formed by connecting a first terminal 200 and a second terminal 300 to both ends of the fuse body 100, thereby forming a fuse 1000 that can be connected to a circuit to protect the circuit.

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

[0126] 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 both ends of the fuse 100 are 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] It is understandable that the arc-extinguishing material is filled in the hollow cavity of the shell 400 and covers the fuse 100.

[0132] The fuse 1000 can also satisfy: 0.5A+T1+T2<0.5D, where A is the width of the fuse body 100, T1 is the width tolerance of the fuse body 100, T2 is the welding tolerance of the fuse body 100, and D is the inner diameter of the housing 400. The width of the fuse body 100 is smaller than the inner diameter of the housing 400 of the fuse 1000.

[0133] In related technologies, there are width tolerances during the processing of fuse elements and welding tolerances during the assembly of fuse elements. The width of the fuse element may be greater than or equal to the inner diameter of the fuse housing. After installation, the fuse element contacts the inner wall of the housing. When the fuse is connected to the circuit and is working normally, the fuse element carries current and its temperature rises, which will cause the temperature of the fuse housing to rise as well. When the circuit current is overloaded and fuses or arcs, the arc will burn through the housing at the contact point because the fuse element is in contact with the inner wall of the housing, affecting the use of the fuse.

[0134] In some embodiments, the inner diameter of the housing 400 of the fuse 1000 is 7 mm, the width of the fuse element 100 is 3.8 mm, and the fuse element 100 does not contact the inner wall of the housing 400 of the fuse 1000.

[0135] It should be noted that the width tolerance of the fuse element 100 is usually 0.5 mm, and the welding tolerance of the fuse element 100 is usually 1 mm. In this embodiment, the width of the fuse element 100 is 3.8 mm. The width of the fuse element 100 plus the width tolerance and welding tolerance is still less than the inner diameter of the housing 400 of the fuse 1000.

[0136] In this embodiment, the fuse 1000 can be a 1500V / gPV junction box fuse, and the fuse body 100 adopts 10 rows of first narrow diameter sections 120 and 2 rows of second narrow diameter sections 130, that is, 5 rows of first narrow diameter sections 120 and 1 row of second narrow diameter sections 130 on each side of the fuse section 110.

[0137] The fuse 1000 can also be a fuse for other voltages, and the number of the first narrow section 120 and the second narrow section 130 is positively correlated with the voltage.

[0138] According to the embodiment of this application, the fuse 1000 reduces the width of the fuse element 100 and increases the inner diameter of the fuse housing 400. This controls the width of the fuse element 100 to be smaller than the inner diameter of the housing 400 even with width tolerance and welding tolerance. This allows the arc of the fuse element 100 to be extinguished within the housing 400, reducing the probability of the housing 400 temperature rising due to the temperature rise of the fuse element 100 and the probability of the housing 400 burning through during arc initiation.

[0139] This application also provides an electrical device.

[0140] The electrical device includes: fuse 1000.

[0141] The fuse 1000 is the fuse 1000 described in the above embodiment.

[0142] Electrical devices can include battery packs, energy storage cabinets, vehicles, etc.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0147] In the description of this application, "multiple" means two or more.

[0148] 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 the first and second features being in contact through another feature between them.

[0149] 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.

[0150] 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.

[0151] 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 portion is provided with at least one first narrow portion on each side of the fuse portion, and a second narrow portion between the fuse portion and the adjacent first narrow portion, the length of the second narrow portion being greater than that of the first narrow portion.

2. The fuse body of claim 1, wherein L2 / L1≥1.5, L1 being the length of the first narrow portion and L2 being the length of the second narrow portion.

3. The fuse body of claim 1, wherein The second narrow portion is provided with a long hole.

4. The fuse body of claim 3, wherein The second narrow portion is provided with a long notch at the edge, and the long hole and the long notch are arranged in the width direction of the fuse body.

5. The fuse body of claim 1, wherein The cross-sectional area of the second narrow portion is smaller than that of the first narrow portion.

6. The fuse body of claim 1, wherein The first narrow portion is provided with a circular hole.

7. The fuse body of claim 6, wherein The first narrow portion is provided with an arc-shaped notch at the edge, and the arc-shaped notch and the circular hole are arranged in the width direction of the fuse body.

8. The fuse body of any one of claims 1-7, wherein, The fuse portion is provided with a groove, and the inner wall of the groove is provided with a melting layer.

9. The fuse body of claim 8, wherein, Further comprising a sealing mechanism arranged at the opening of the groove.

10. A fuse, characterized in that Comprising: a first terminal; a second terminal; The fuse body according to any one of claims 1-9; wherein, The first terminal and the second terminal are respectively connected to the opposite ends of the fuse body.

11. The fuse of claim 10, wherein Further comprising: a housing, the first terminal and the second terminal are respectively mounted at the two ends of the housing, the fuse body is located in the housing, and satisfies: 0.5A+T1+T2<0.5D, wherein A is the width of the fuse body, T1 is the width tolerance of the fuse body, T2 is the assembly tolerance of the fuse body, and D is the inner diameter of the housing.

12. An electrical device, comprising: Comprising: The fuse according to claim 10 or 11.

Images