Insulating tube body and fuse for fuse

Abstract

The present application provides an insulating tube body and a fuse for a fuse, wherein the insulating tube body is provided with a first penetration cavity, and the penetration cavity is used to place the fuse of the fuse; at least one second penetration cavity is provided on the tube wall of the insulating tube body, and the at least one second penetration cavity is connected with the first penetration cavity, and the volume of the at least one second penetration cavity is smaller than the first penetration cavity; at least one second penetration cavity is filled with an arc extinguishing layer, and the arc extinguishing layer is composed of an arc extinguishing material; when the fuse begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, and arc extinguishing gas is generated and blown from the connection port between the target penetration cavity and the first penetration cavity to the melt in the first penetration cavity, wherein the target penetration cavity is one of the at least one second penetration cavity. In this way, a small amount of arc extinguishing material is used to pressurize and blow the melt at the melting part, so that the amount of gas generated is reduced while achieving rapid arc extinguishing, and the total pressure in the tube body is reduced, which can improve the explosion-proof ability and breaking ability of the fuse.

Description

Technical Field

[0001] The present application belongs to the technical field of emergency protection devices, and specifically relates to an insulating tube body and a fuse for a fuse. Background Art

[0002] At present, the insulating tube body is one of the important components of the fuse. Its function is to support or contain the molten metal and arc-extinguishing materials and protect the molten metal from external environmental factors. However, the insulating shell of the existing fuse will increase the pressure inside the tube due to the large amount of gas generated by the vaporization of the arc-extinguishing material, and the explosion-proof ability of the insulating tube body is low. Summary of the invention

[0003] The present application provides an insulating tube body for a fuse and a fuse, in order to reduce the pressure in the tube body and improve the explosion-proof capability of the insulating tube body.

[0004] In a first aspect, the present application provides an insulating tube body for a fuse, wherein the insulating tube body is provided with a first penetration cavity, and the penetration cavity is used to place a fuse of the fuse; at least one second penetration cavity is provided on a tube wall of the insulating tube body, and the at least one second penetration cavity is connected to the first penetration cavity, and the volume of the at least one second penetration cavity is smaller than that of the first penetration cavity; the at least one second penetration cavity is filled with an arc extinguishing layer, and the arc extinguishing layer is composed of an arc extinguishing material;

[0005] When the melt begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, generating arc extinguishing gas that blows from the connection port between the target penetration cavity and the first penetration cavity toward the melt in the first penetration cavity, wherein the target penetration cavity is one of the at least one second penetration cavity.

[0006] In a possible embodiment, the insulating tube body is a hollow cylinder, and the at least one second penetrating cavity is arranged on the tube wall in at least one direction of the positive half axis of the radial X axis of the insulating tube body, the negative half axis of the radial X axis, the positive half axis of the radial Y axis of the insulating tube body, and the negative half axis of the radial Y axis.

[0007] In a possible embodiment, the connection openings in the at least one second penetration cavity arranged between the second penetration cavities of opposite half-axes are located on different radial cross-sections of the insulating tube body.

[0008] In a possible embodiment, the connection opening between the second penetration cavities of adjacent half-shafts in the at least one second penetration cavity is located on the same radial cross-section of the insulating tube body.

[0009] In a possible embodiment, at least one predicted melting point is correspondingly arranged on the fuse, and the gas outlet direction of the connecting port of each second penetration cavity is on the same straight line as the first predicted melting point, and the first predicted melting point is one of the at least one predicted melting point.

[0010] In a possible embodiment, a total area occupied by an opening of the at least one second penetrating cavity is less than or equal to 50% of the surface area of ​​the insulating tube.

[0011] In a possible embodiment, the second penetrating cavity includes a filling portion and the connecting port, and a diameter of the filling portion is larger than that of the connecting port.

[0012] In a possible embodiment, the diameter of the connecting port is 10%-50% of the diameter of the filling portion.

[0013] In a possible embodiment, a sealing layer is further provided in the second penetrating cavity. The sealing layer is provided on the arc extinguishing layer and is used for sealing the second penetrating cavity.

[0014] In a second aspect, the present application provides a fuse, comprising a fuse element and the insulating tube body for the fuse described in the first aspect, wherein the fuse element is arranged in a first penetration cavity of the insulating tube body.

[0015] It can be seen that in the present application, first, the insulating tube body is provided with a first penetration cavity for placing the fuse; at least one second penetration cavity is provided on the tube wall of the insulating tube body, the at least one second penetration cavity is connected with the first penetration cavity, and the volume of the at least one second penetration cavity is smaller than the first penetration cavity; the at least one second penetration cavity is filled with an arc extinguishing layer, and the arc extinguishing layer is composed of an arc extinguishing material; when the melt begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, and arc extinguishing gas is generated and blown from the connection port between the target penetration cavity and the first penetration cavity to the melt in the first penetration cavity, wherein the target penetration cavity is one of the at least one second penetration cavity. In this way, the melt is extinguished by a small amount of arc extinguishing material, the amount of gas generated is reduced, the pressure in the tube body is reduced, and the explosion-proof ability and breaking ability of the fuse can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1It is a structural schematic diagram of a first insulating tube body provided in an embodiment of the present application;

[0018] Figure 2 is a structural schematic diagram of a second insulating tube body provided in an embodiment of the present application;

[0019] Figure 3 It is a structural schematic diagram of a third insulating tube body provided in an embodiment of the present application;

[0020] Figure 4 It is a schematic structural diagram of the fourth insulating tube body provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, systems, products or devices.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] A fuse is a protective device based on thermal and trigger effects. It is usually composed of a metal melt, an insulating tube, and terminals. When the current in the circuit exceeds the rated current of the metal melt, the metal melt itself will be heated and melted, thereby cutting off the circuit to prevent the current from exceeding the rated value and causing line overload. Fuses are widely used in high and low voltage power distribution systems and control systems as well as electrical equipment. As a short circuit and overcurrent protector, they are one of the most commonly used protective devices.

[0025] As one of the important components of the fuse, the insulating tube body is used to support or contain the metal melt and arc extinguishing materials, and to protect the metal melt from external environmental factors. Therefore, it should have good electrical insulation performance and be able to withstand the impact pressure generated during the short-circuit current of the fuse. At the same time, it should be able to withstand the temporary high temperature generated by the short-circuit current. Generally speaking, the insulating tube body is only a structural component of the fuse product, and its contribution to improving the product's breaking capacity is very small. As the power electronics industry's requirements for the performance of fuse products increase, its safe breaking capacity has become more and more stringent. Therefore, the existing process of filling the gap between the insulating tube body and the metal melt with quartz sand to extinguish the arc has gradually failed to meet the needs of customers. A new process is urgently needed to improve the breaking performance of the fuse product. There is no doubt that if the insulating tube body can be transformed from a protective role of a structural component to a part of a functional component that can improve the explosion-proof capability of the fuse product, the breaking performance of the overall product will be greatly enhanced.

[0026] At present, the insulating tube body is one of the important components of the fuse. Its function is to support or contain the molten metal and arc-extinguishing materials and protect the molten metal from external environmental factors. However, the insulating shell of the existing fuse will increase the pressure inside the tube due to the large amount of gas generated by the vaporization of the arc-extinguishing material, and the explosion-proof ability of the insulating tube body is low.

[0027] To solve the above problems, the embodiment of the present application provides an insulating tube body for a fuse. The insulating tube body for a fuse can be applied to the scenario of fuse circuit protection. A first penetration cavity for placing the fuse can be provided in the insulating tube body; at least one second penetration cavity is provided on the tube wall of the insulating tube body, the at least one second penetration cavity is connected to the first penetration cavity, and the volume of the at least one second penetration cavity is smaller than the first penetration cavity; the at least one second penetration cavity is filled with an arc extinguishing layer, and the arc extinguishing layer is composed of an arc extinguishing material; when the melt begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, and arc extinguishing gas is generated and blown from the connection port between the target penetration cavity and the first penetration cavity to the melt in the first penetration cavity, wherein the target penetration cavity is one of the at least one second penetration cavity. In this way, a small amount of arc extinguishing material is used to pressurize and blow the melt at the melting part, so that the amount of gas generated is reduced while achieving rapid arc extinguishing, and the pressure in the tube body is reduced, which can improve the explosion-proof ability and breaking ability of the fuse. This scheme can be applied to a variety of scenarios, including but not limited to the application scenarios mentioned above.

[0028] The specific structure is introduced in detail below.

[0029] See also Figure 1The present application provides an insulating tube body 10 for a fuse, wherein the insulating tube body 10 is provided with a first penetration cavity 30, wherein the penetration cavity is used to place the fuse of the fuse; at least one second penetration cavity 20 is provided on the tube wall of the insulating tube body 10, wherein the at least one second penetration cavity 20 is connected to the first penetration cavity 30, and the volume of the at least one second penetration cavity 20 is smaller than that of the first penetration cavity 30; an arc extinguishing layer is filled in the at least one second penetration cavity 20, wherein the arc extinguishing layer is composed of an arc extinguishing material;

[0030] When the melt begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, generating arc extinguishing gas that blows from the connection port 22 between the target penetration cavity and the first penetration cavity 30 toward the melt in the first penetration cavity 30, wherein the target penetration cavity is one of the at least one second penetration cavity 20.

[0031] In a specific implementation, this embodiment provides a first penetration cavity 30 on the main body of the insulating tube body 10 to accommodate the melt. The material of the insulating tube body 10 can be ceramic, glass fiber wire, melamine or other materials, which are not limited here. A second penetration cavity 20 is also provided on the tube wall of the insulating tube body 10, and the second penetration cavity 20 is filled with an arc extinguishing layer. The arc extinguishing material in the arc extinguishing layer includes at least one of polyolefin, polyvinyl chloride, chloroprene rubber, chlorosulfonated polyethylene, ethylene propylene rubber, or is composed of other materials. It only needs to be able to produce arc extinguishing gas, which is not limited here. When an abnormally large current passes through the fuse, the surface temperature of the melt will increase rapidly, and the insulating tube body 10 will be heated by the quartz sand material inside the insulating tube body 10, so that the surface temperature of the insulating tube body 10 increases, and the surface temperature of the melt in the fuse After the surface temperature reaches a certain value, it starts to melt and an arc is generated; at this time, the surface temperature of the insulating tube body 10 is also sufficient to decompose the arc extinguishing material of the arc extinguishing layer in the second penetrating cavity 20 into carbon dioxide and water vapor by heat, and obtain an arc extinguishing gas mixed with multiple gases, so that the pressure difference between the second penetrating cavity 20 and the first penetrating cavity 30 becomes larger, and the generated arc extinguishing gas will be blown into the first penetrating cavity 30 at a very fast speed, thereby blowing the ions and electrons in the arc column area of ​​the arc in the first penetrating cavity 30 to the outside of the arc column, accelerating the diffusion and cooling of the particles in the arc, which is beneficial to the extinction of the arc.

[0032] It can be seen that in this embodiment, the insulating tube body 10 is used as a part of the explosion-proof component, a second penetrating cavity 20 is set on the tube wall of the insulating tube body 10, and an arc-extinguishing layer is filled in the second penetrating cavity 20. Arc-extinguishing gas is generated only by a small amount of arc-extinguishing material in the second penetrating cavity 20 to extinguish the arc. Therefore, the pressure in the insulating tube body 10 is relatively small, which improves the explosion-proof capability of the fuse and can achieve the effect of precise arc extinguishing.

[0033] In a possible embodiment, as shown in the figure, the second penetrating cavity includes a filling portion 21 and a connecting port 22 , and the diameter of the filling portion 21 is larger than that of the connecting port 22 .

[0034] In a specific implementation, a filling portion 21 can be provided in the second penetration cavity 20 to fill the arc extinguishing material, and a connecting port 22 is provided below the filling portion 21. The connecting port 22 can be a channel, and the size of the channel is much smaller than the size of the filling portion 21. For example, the diameter of the connecting port 22 is 10%-50% of the diameter of the filling portion 21. Under this arrangement, when arc extinguishing gas is generated, the pressure between the second penetration cavity 20 and the first penetration cavity 30 is greater, thereby increasing the speed of the arc extinguishing gas ejected from the connecting port 22. In other words, this embodiment does not overflow in a dispersed manner like a traditional melamine gas generating arc extinguishing tube, but gathers the generated arc extinguishing gas into a small hole and ejects it, thereby increasing the pressure of the gas ejection, allowing the gas to eject faster, and the "arc blowing" effect on the arc is more obvious, which is more conducive to the extinguishing of the arc.

[0035] Furthermore, a sealing layer 23 is also provided in the second penetration cavity 20, and the sealing layer 23 is provided on the arc extinguishing layer, and is used to seal the second penetration cavity 20. The sealing layer 23 enhances the sealing property of the second penetration cavity 20, and blocks the second penetration cavity 20 from the external environment of the insulating tube body 10, and prevents gas leakage in the second penetration cavity 20, so as to ensure that the pressure arc extinguishing gas in the second penetration cavity 20 can be smoothly ejected to the first penetration cavity 30, and ensure a good arc extinguishing effect. Among them, the sealing material in the sealing layer 23 can be silicone resin, epoxy resin or other materials, as long as it can meet the sealing requirements of the fuse, and is not limited here.

[0036] For example, assuming that the filling part 21 is a cylinder with a bottom diameter of 2 mm, and the connecting port 22 is a cylinder with a diameter of 0.3 mm, at this time, the bottom diameter of the connecting port 22 is 15% of the filling part 21. The arc-extinguishing material is filled in the filling part 21 to form an arc-extinguishing layer. The arc-extinguishing material is mainly composed of polyvinyl chloride and is pressed into a cylinder with a diameter of 1.9 mm through a dry pressing process. The height of the cylinder is about 0.5 mm lower than the filling part 21; the sealing material is coated on the cylinder formed by the arc-extinguishing material and in the gap between the cylinder and the part to be filled 21 to form a sealing layer 23. The sealing material adopts silicone resin glue. After coating, the height is flush with the upper surface of the corresponding side of the insulating tube body 10, and then solidified to obtain sufficient sealing strength.

[0037] It is understandable that the shapes of the filling portion 21 and the connection port 22 are not limited to cylinders, and can be cylindrical, cubic, or other shapes, as long as the effect of increasing the gas ejection speed in the present application can be achieved. Similarly, the sizes of the filling portion 21, the arc extinguishing layer, and the connection port 22 are not limited and can be freely adjusted according to actual conditions.

[0038] After adding the arc extinguishing material mainly composed of flame retardant material into the filling part 21 in the second penetration cavity 20 of the insulating tube body 10, the arc extinguishing material will be decomposed by heat to generate gas under the heating effect of the short-circuit current of the fuse product. Because the end of the filling part 21 connected to the outside is blocked by the sealing layer 23, the generated gas can only move along the connection port 22 to the inside of the insulating tube body 10, and as the pressure of the generated gas increases, at the junction of the connection port 22 and the first penetration cavity 30 of the insulating tube body 10, the pressure drops suddenly due to the sudden increase in volume. This pressure difference will cause the gas to be quickly and violently sprayed from the connection port 22 to the first penetration cavity 30 of the insulating tube body 10, thereby blowing the ions and electrons in the arc column area of ​​the first penetration cavity 30 away from the arc column area, accelerating the diffusion and cooling of the ions, so that the arc can be extinguished more quickly.

[0039] Specifically, the insulating tube body 10 is a hollow cylinder, and the hollow cylinder can be a hollow square cylinder, a hollow cylinder, or a hollow cylinder of other shapes, which is not limited here.

[0040] Further, the at least one second penetration cavity 20 is disposed on the tube wall in at least one of the positive semi-axis of the radial X axis, the negative semi-axis of the radial X axis, the positive semi-axis of the radial Y axis, and the negative semi-axis of the radial Y axis of the insulating tube body 10. Figure 1-Figure 3 As shown, the radial direction refers to the X-axis and Y-axis directions, and the axial direction refers to the Z-axis direction.

[0041] The following is an illustration of different configurations of the second penetrating cavity 20 .

[0042] Embodiment 1

[0043] When there is only one second penetrating cavity 20, it can only be arranged on the tube wall in one direction, so it is not necessary to discuss it. The following discusses the case where there are multiple second penetrating cavities 20 (greater than or equal to two) and they are all arranged on the tube wall in the same direction.

[0044] When the plurality of second penetration cavities 20 are disposed on the wall of the insulating tube body 10 in only one direction, for example, Figure 2 Taking three second penetration cavities 20 as an example, the three second penetration cavities 20 are arranged Figure 2 On the tube wall of the positive half axis of the X-axis; at this time, the three second penetrating cavities 20 can be arranged equidistantly on the tube wall of the positive half axis of the X-axis, or the second penetrating cavities 20 can be arranged at other intervals.

[0045] In addition, at least one predicted melting point is correspondingly arranged on the fuse, and the gas outlet direction of the connection port 22 of each second penetration cavity 20 is in the same straight line as the first predicted melting point, and the first predicted melting point is one of the at least one predicted melting point.

[0046] In the specific implementation, in the preferred embodiment, only one predicted melting point is set, and in an ideal state, the fuse only melts at the predicted melting point; at the same time, the connection ports 22 of the three second penetration cavities 20 are all aimed at the predicted melting point (i.e., the first melting point), and when the predicted melting point melts, arc extinguishing gas is respectively sprayed toward the predicted melting point from the three connection ports 22. Since the arc extinguishing gas is sprayed from the same side, the three arc extinguishing gases will not cancel each other out, but will generate a strong airflow at the predicted melting point, further accelerating the diffusion and cooling of particles in the arc, and improving the segmentation capability.

[0047] Embodiment 2

[0048] In a possible embodiment, the connecting opening 22 between the second penetrating cavities 20 of opposite half shafts in at least one second penetrating cavity is located on different radial cross sections of the insulating tube body 10 .

[0049] like Figure 3 As shown, taking two second penetration cavities 20 as an example, the two second penetration cavities 20 are respectively arranged on the positive semi-axis and the negative semi-axis (i.e., the relative semi-axis) of the X-axis. At this time, if the two second penetration cavities 20 on the relative semi-axis are arranged on the same radial section, the gases ejected from the connection ports 22 in the two second penetration cavities 20 will collide with each other. At this time, the wind forces will cancel each other out, making it difficult for the electrons and ions in the arc column to leave the arc range, thereby reducing the arc extinguishing effect. Therefore, in this embodiment, the second penetration cavities 20 arranged on the relative semi-axis tube wall can be staggered, that is, arranged at different radial sections, so that the arc extinguishing gases on both sides cannot collide with each other, and the arc extinguishing material in the filling portion 21 is prevented from being decomposed by heat to generate gas and ejected through the connecting hole portion. The electrons and ions in the arc column cannot be blown out due to the interaction of the gases, thereby reducing the arc extinguishing effect.

[0050] In addition, in this embodiment, at least one predicted melting point is correspondingly arranged on the fuse, and the gas outlet direction of the connection port 22 of each second penetration cavity 20 is in the same straight line as the first predicted melting point, and the first predicted melting point is one of the at least one predicted melting point.

[0051] In the specific implementation, in the preferred embodiment, only one predicted melting point is set, and in an ideal state, the fuse only melts at the predicted melting point; at the same time, the connection ports 22 of the two second penetrating cavities 20 on the relative semi-axis are aligned with the predicted melting point (i.e., the first melting point), and when the predicted melting point melts, arc extinguishing gas is respectively sprayed to the predicted melting point from the three connection ports 22. Since the two arc extinguishing gases are staggered, they will not cancel each other out, but will generate a strong airflow at the predicted melting point, further accelerating the diffusion and cooling of particles in the arc and improving the segmentation capability.

[0052] It is understandable that not only one second penetrating cavity 20 may be provided on both sides of the relative radius, but two, three, or more second penetrating cavities 20 may also be provided on both sides, and the number is not limited here.

[0053] Embodiment 3

[0054] In a possible embodiment, the connection opening 22 of at least one second penetration cavity 20 disposed between the second penetration cavities 20 of adjacent half shafts is on the same radial cross section of the insulating tube body 10 .

[0055] In the specific implementation, Figure 4 As shown, taking two second penetrating cavities 20 as an example, the two second penetrating cavities 20 are respectively arranged on the positive semi-axis of the X-axis and the negative semi-axis of the Y-axis (i.e., adjacent semi-axes). At this time, since the jet directions of the connecting ports 22 of the two second penetrating cavities 20 on the adjacent semi-axes are vertical, there will be no arc extinguishing gas collision even if they are arranged on the same radial section. Moreover, when they are arranged on the same radial section, there is no need to adjust the angle of the connecting port 22. The two arc extinguishing gases can act on the predicted melting point A at the same time, further accelerating the diffusion and cooling of the particles in the arc, thereby greatly improving the arc extinguishing effect of this design and improving the segmentation capability.

[0056] Two second penetrating cavities 20 can be formed on two adjacent sides of the insulating tube body 10, and are preferably arranged at the side position of the tube wall of the insulating tube body 10 corresponding to the position where the fuse is expected to melt, and the openings of the two connecting ports 22 are both facing the predicted melting point A of the fuse, thereby greatly improving the arc extinguishing effect.

[0057] Embodiment 4

[0058] Compared with the third embodiment, in the present embodiment, the two second penetrating cavities 20 in the adjacent semi-axis directions can also be staggered, that is, for at least one predicted melting point A corresponding to the melt, the gas outlet direction of the connecting port 22 of each second penetrating cavity 20 is on the same straight line as the first predicted melting point, and the first predicted melting point is one of the at least one predicted melting point A.

[0059] In the specific implementation, in the preferred embodiment, only one predicted melting point A is set, and in an ideal state, the fuse only melts at the predicted melting point A; at the same time, the connection ports 22 of the two second penetrating cavities 20 on the adjacent semi-axes are both aligned with the predicted melting point A (i.e., the first melting point), and when the predicted melting point A melts, arc extinguishing gas is respectively sprayed from the two connection ports 22 to the predicted melting point A. Since the two arc extinguishing gases are already staggered, they will not cancel each other out, but will generate a strong airflow at the predicted melting point A, further accelerating the diffusion and cooling of particles in the arc and improving the segmentation capability.

[0060] In a possible embodiment, the total area occupied by the opening of at least one second penetration cavity 20 is less than or equal to 50% of the surface area of ​​the insulating tube body 10 .

[0061] In a specific implementation, the addition of the second penetrating cavity 20 has a significant effect on improving the arc extinguishing performance of the insulating tube body 10, but it will reduce the mechanical strength of the insulating tube body 10 itself; that is, the more second penetrating cavities 20 are set, the more holes will be dug in the insulating tube body 10, thereby reducing the structural strength of the second penetrating cavity 20 of the insulating tube body 10, making the insulating tube body 10 more susceptible to fracture and damage.

[0062] The insulating tube body 10 may break as the gas pressure in the insulating tube body 10 increases, or it may burst due to the inability to withstand the explosion pressure generated when the fuse is disconnected. Therefore, the more second penetration cavities 20, the better. The total area of ​​the second penetration cavities 20 on the surface of the insulator should be controlled to be less than 50% of the surface area of ​​the insulating tube body 10 when the second penetration cavities 20 are not provided. In this way, the arc extinguishing requirements can be met and the explosion-proof capability of the insulating tube body 10 is above a certain level.

[0063] The present application also provides a fuse, which comprises a melt and an insulating tube body for a fuse as described in an embodiment of the present application, wherein the melt is arranged in a first penetration cavity of the insulating tube body.

[0064] In the specific implementation, in this embodiment, first, the insulating tube body is provided with a first penetration cavity for placing the fuse; at least one second penetration cavity is provided on the tube wall of the insulating tube body, the at least one second penetration cavity is connected with the first penetration cavity, and the volume of the at least one second penetration cavity is smaller than the first penetration cavity; the at least one second penetration cavity is filled with an arc extinguishing layer, and the arc extinguishing layer is composed of an arc extinguishing material; when the melt begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, and arc extinguishing gas is generated and blown from the connection port between the target penetration cavity and the first penetration cavity to the melt in the first penetration cavity, wherein the target penetration cavity is one of the at least one second penetration cavity. In this way, a small amount of arc extinguishing material is used to pressurize and blow the melt at the melting part, which can achieve rapid arc extinguishing while reducing the amount of gas generated and the pressure in the tube body, thereby improving the explosion-proof ability and breaking ability of the fuse.

[0065] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. An insulating tube body for a fuse, characterized in that: The insulating tube body is provided with a first penetration cavity, and the first penetration cavity is used to place the fuse of the fuse; the tube wall of the insulating tube body is provided with at least one second penetration cavity, and the at least one second penetration cavity is connected with the first penetration cavity, and the volume of the at least one second penetration cavity is smaller than that of the first penetration cavity; The at least one second penetrating cavity is filled with an arc extinguishing layer, wherein the arc extinguishing layer is composed of an arc extinguishing material; When the melt begins to melt, the arc extinguishing material in the target penetration cavity is decomposed by heat, generating arc extinguishing gas that blows from the connection port between the target penetration cavity and the first penetration cavity toward the melt in the first penetration cavity, wherein the target penetration cavity is one of the at least one second penetration cavity.

2. The insulating tube body for fuse according to claim 1, characterized in that: The insulating tube body is a hollow cylinder, and the at least one second penetrating cavity is arranged on the tube wall in at least one direction of the positive half axis of the radial X axis of the insulating tube body, the negative half axis of the radial X axis, the positive half axis of the radial Y axis of the insulating tube body, and the negative half axis of the radial Y axis.

3. The insulating tube body according to claim 2, characterized in that: The connection openings in the at least one second penetration cavity arranged between the second penetration cavities of the opposite half-axes are located on different radial cross-sections of the insulating tube body.

4. The insulating tube body according to claim 2, characterized in that: The connection openings in the at least one second penetration cavity arranged between the second penetration cavities of adjacent half shafts are located on the same radial cross section of the insulating tube body.

5. The insulating tube body according to claim 1, characterized in that: At least one predicted melting point is correspondingly arranged on the fuse, and the gas outlet direction of the connecting port of each second penetration cavity is in the same straight line as the first predicted melting point, and the first predicted melting point is one of the at least one predicted melting point.

6. The insulating tube body according to claim 1, characterized in that: The total area occupied by the opening of the at least one second penetration cavity is less than or equal to 50% of the surface area of ​​the insulating tube.

7. The insulating tube body for a fuse according to any one of claims 1 to 6, characterized in that: The second penetrating cavity includes a filling portion and the connecting port, and the filling portion has a larger diameter than the connecting port.

8. The insulating tube body according to claim 7, characterized in that: The diameter of the connecting port is 10%-50% of the diameter of the filling portion.

9. The insulating tube body according to any one of claims 1 to 6, characterized in that: A sealing layer is also provided in the second penetrating cavity. The sealing layer is provided on the arc extinguishing layer and is used for sealing the second penetrating cavity.

10. A fuse, characterized in that: The invention comprises a fuse and an insulating tube body for a fuse according to any one of claims 1 to 9, wherein the fuse is arranged in a first penetration cavity of the insulating tube body.

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