Insulating cylinder type high-voltage fuse with state display function

Abstract

This utility model discloses an insulated cylinder type high-voltage fuse with status display function, relating to the field of power equipment technology. The insulated cylinder type high-voltage fuse with status display function includes an insulating cylinder, a fuse element, a plug-in handle, and a sealing cap. The insulating cylinder has several first grooves surrounding its outer wall, and several second grooves at its bottom. The plug-in handle includes an outer column and an indicating component. The top of the indicating component has a working status indicator, and the indicating component is slidably connected to the inner wall of the outer column. The top surface of the outer column has an opening for the top of the indicating component to pass through. The fuse element includes a striking pin, which presses against the indicating component in the fused state, allowing the top of the indicating component to pass through the opening. This utility model facilitates the display of working status and is small in size and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to an insulated cylindrical high-voltage fuse with status display function. Background Technology

[0002] A high-voltage fuse is a protective device used in high-voltage power systems, primarily for short-circuit and overcurrent protection of transmission lines and power transformers. Its core function is to quickly disconnect the circuit when an overload or short-circuit fault occurs, protecting downstream equipment from damage.

[0003] Existing insulated cylinder type high-voltage fuses, such as the fully insulated fuse with patent number CN102376506B, although this method solves the problem of isolation between the fuse core and the insulating medium and external sealing and waterproofing, the working status of the fuse core cannot be viewed from the outside, which makes subsequent inspection and maintenance very inconvenient.

[0004] In addition, existing insulated cylinder type high voltage fuses are generally only suitable for use on power equipment with lower voltage levels of 10kV and below. As the voltage level increases, the length of the fuse core will increase significantly, and the size of the insulated cylinder will also increase significantly, directly leading to a significant increase in the size and cost of the power equipment.

[0005] Therefore, there is an urgent need to design an insulated cylinder type high-voltage fuse with status display function to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an insulated cylindrical high-voltage fuse with status display function, which is convenient for displaying the working status and is small in size and low in cost.

[0007] To address the aforementioned technical problems, this utility model provides an insulating cylinder-type high-voltage fuse with a status display function, comprising an insulating cylinder, a fuse element, a plug-in handle, and a sealing cover. The sealing cover is detachably connected to the top of the insulating cylinder, and the plug-in handle is detachably connected to the top of the fuse element. The fuse element and the plug-in handle are both located between the insulating cylinder and the sealing cover. The outer wall of the insulating cylinder has several first grooves, and the bottom of the insulating cylinder has several second grooves, the second grooves extending upward from the bottom surface of the insulating cylinder along its axial direction. The plug-in handle includes an outer column and an indicator component. The top of the indicator component has a fuse-broken status indicator, and the indicator component is slidably connected to the inner wall of the outer column. The top surface of the outer column has an opening for the top of the indicator component to pass through. The fuse element includes a striking pin, which presses against the indicator component in the fuse-broken state, allowing the top of the indicator component to pass through the opening.

[0008] As an improvement to the above solution, the insulating cylinder includes, from top to bottom, a threaded ring, a flange ring, a middle section cylinder, a pre-embedded end, and a metal conductive assembly; the outer wall of the threaded ring is threaded to connect with the sealing cap; a first washer is provided at the junction of the threaded ring and the flange ring, a washer groove is provided at the bottom of the flange ring, and a second washer is provided in the washer groove; the first groove is provided on the outer wall of the middle section cylinder, and the second groove is provided at the bottom of the pre-embedded end; a fixed contact is provided in the middle of the pre-embedded end, the fixed contact includes a channel and a first screw hole, the channel and the first screw hole are separated from each other, the inner sidewall of the channel is provided with several annular grooves, a first conductive spring contact finger is provided in the annular grooves, and a first wiring bolt is provided in the first screw hole; the metal conductive assembly includes a metal ring pre-embedded inside the flange ring, a metal sheet pre-embedded in the middle section cylinder, and a metal threaded sleeve pre-embedded in the pre-embedded end, a second wiring bolt is provided in the metal threaded sleeve, and the metal ring is connected to the metal threaded sleeve through the metal sheet.

[0009] As an improvement to the above solution, the fused core further includes a first conductive cap, a second conductive cap, and an insulating shell surrounding the firing pin; the bottom of the first conductive cap is connected to the top of the insulating shell, and the top of the first conductive cap is threaded to be threadedly connected to the insertion and removal handle; the top of the second conductive cap is connected to the bottom of the insulating shell, and the bottom of the second conductive cap is provided with a metal rod to be connected to the first conductive spring contact finger.

[0010] As an improvement to the above solution, the fused core further includes an insulating sleeve disposed on the outer wall of the insulating shell, the insulating sleeve including a plurality of umbrella skirts, the umbrella skirts being provided with venting channels.

[0011] As an improvement to the above solution, the plug-in handle further includes a metal sleeve located at the bottom of the outer column, the inner wall of the metal sleeve being threaded to be threadedly connected to the first conductive cap; the indicator component is fitted with a shock-absorbing washer; the outer wall of the outer column is provided with a column groove, the column groove being fitted with a third washer; the outer wall of the metal sleeve is provided with a metal sleeve groove, the metal sleeve groove being fitted with a second conductive spring contact finger to be connected to the metal ring.

[0012] As an improvement to the above solution, the top of the sealing cover is provided with a transparent observation window for observing the indicator component; the interior of the sealing cover includes a first channel, a second channel and a third channel from top to bottom; the first channel is used for the top of the indicator component to pass through, the bottom of the second channel is provided with a third washer, and the third channel is a threaded hole for threaded connection with the outer wall of the threaded ring.

[0013] As an improvement to the above solution, the outer wall of the sealing cover is provided with several reinforcing ribs.

[0014] As an improvement to the above solution, both the first conductive spring contact and the second conductive spring contact are annular inclined coil conductive spring contacts.

[0015] As an improvement to the above solution, the insulating cylinder and sealing cap are both made of epoxy resin, the outer column and the indicating component are both made of epoxy resin, and the metal sleeve is made of conductive metal material.

[0016] As an improvement to the above solution, the insulating sleeve is made of cold-shrink silicone rubber.

[0017] The beneficial effects of implementing this utility model are as follows:

[0018] This utility model of an insulating cylindrical high-voltage fuse with status display function achieves a visual display of the fuse core status by setting an indicator component that is slidably connected to the outer column and has a working status mark. The indicator component is pressed by the striker to expose the top of the opening, which makes it easy for users to intuitively judge whether the fuse core has melted, thereby improving the maintenance efficiency and safety of the equipment. Furthermore, by setting the first groove and the second groove to increase the creepage distance, the overall size is small and the cost is low.

[0019] Furthermore, this utility model's insulated cylinder type high-voltage fuse with status display function achieves reliable connection between the sealing cover and the insulating cylinder by meticulously dividing the structure of the insulating cylinder and setting the threaded ring, flange ring, intermediate cylinder, pre-embedded end, and metal conductive components, thereby enhancing the overall sealing performance and electrical conductivity. The design of the fuse core, including the conductive cap, insulating shell, and insulating sleeve, not only ensures a stable connection between the fuse core and the plug-in handle and fixed contact, but also increases the creepage distance through the insulating sleeve, improving insulation performance and making it suitable for higher voltage level power equipment. The structure of the plug-in handle, including the metal sleeve, shock-absorbing washer, third washer, and second conductive spring contact finger, further enhances the stability and sealing of the connection, while ensuring the reliability of the electrical connection. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of the insulating cylindrical high-voltage fuse with status display function according to this utility model;

[0021] Figure 2 This is a cross-sectional view of the insulating cylindrical high-voltage fuse with status display function according to this utility model;

[0022] Figure 3 This is a cross-sectional view of the insulating cylinder in the insulating cylinder type high-voltage fuse with status display function of this utility model;

[0023] Figure 4This is a three-dimensional structural diagram of the fuse core in the insulating cylindrical high-voltage fuse with status display function of this utility model;

[0024] Figure 5 This is a cross-sectional view of the plug-in handle in the insulating cylindrical high-voltage fuse with status display function of this utility model;

[0025] Figure 6 This is a three-dimensional structural diagram of the indicating component in the insulating cylindrical high-voltage fuse with status display function of this utility model;

[0026] Figure 7 This is a three-dimensional structural diagram of the sealing cover in the insulating cylindrical high-voltage fuse with status display function of this utility model;

[0027] Figure 8 This is a cross-sectional view of the sealing cover in the insulating cylindrical high-voltage fuse with status display function of this utility model;

[0028] Figure 9 This is a schematic diagram of the annular inclined conductive spring contact finger in the insulating cylindrical high-voltage fuse with status display function of this utility model.

[0029] Figure 10 This is a three-dimensional structural diagram of the insulated cylindrical high-voltage fuse with status display function in the working state of the fuse core and the plug-in handle.

[0030] Figure 11 This is a three-dimensional structural diagram of the insulating cylindrical high-voltage fuse with status display function in which the fuse core and the plug-in handle are in the melted state. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0032] like Figure 1 and Figure 2 As shown, the insulating cylinder type high voltage fuse with status display function of this utility model includes an insulating cylinder 1, a fuse element 2, a plug-in handle 3 and a sealing cover 4. The sealing cover 4 is detachably connected to the top of the insulating cylinder 1, and the plug-in handle 3 is detachably connected to the top of the fuse element 2. The fuse element 2 and the plug-in handle 3 are both located between the insulating cylinder 1 and the sealing cover 4.

[0033] like Figure 3As shown, the outer wall of the insulating cylinder 1 is provided with a plurality of first grooves 11, and the bottom of the insulating cylinder 1 is provided with a plurality of second grooves 12, the second grooves 12 extending upward from the bottom surface of the insulating cylinder 1 along the axial direction of the insulating cylinder 1;

[0034] like Figure 5 As shown, the plug-in handle 3 includes an outer column 31 and an indicator component 32. The top of the indicator component 32 is provided with a fuse status indicator. The indicator component 32 is slidably connected to the inner wall of the outer column 31. The top surface of the outer column 31 is provided with an opening 311 for the top of the indicator component 32 to pass through.

[0035] like Figure 4 As shown, the fused core 2 includes a striking pin 21, which presses against the indicating component 32 when it is in the melted state, so that the top of the indicating component 32 passes through the opening 311.

[0036] It should be noted that the specific principle by which the striking pin 21 presses against the indicating component 32 when it is in a melted state is existing technology and will not be described in detail here.

[0037] This utility model of an insulating cylindrical high-voltage fuse with status display function achieves a visual display of the status of the fuse element 2 by setting an indicator component 32 that is slidably connected to the outer column 31 and has a working status indicator. The top of the indicator component 32 is exposed by the striker pin 21 pressing against it, making it easy for users to intuitively judge whether the fuse element has melted, thereby improving the maintenance efficiency and safety of the equipment. Furthermore, the creepage distance is increased by setting the first groove 11 and the second groove 12, resulting in a small overall size and low cost.

[0038] The following describes the specific structure of the insulating cylinder 1, fuse element 2, plug-in handle 3, and sealing cover 4 in the insulating cylinder type high-voltage fuse with status display function of this utility model:

[0039] like Figure 3 As shown, the insulating cylinder includes, from top to bottom, a threaded ring 13, a flange ring 14, a middle section cylinder 15, a pre-embedded end 16, and a metal conductive component 17.

[0040] The outer wall of the threaded ring 13 is threaded to be threadedly connected to the sealing cap 4;

[0041] A first washer 141 is provided at the junction of the threaded ring 13 and the flange ring 14, a washer groove 142 is provided at the bottom of the flange ring 14, and a second washer 143 is provided in the washer groove 142.

[0042] The first groove 11 is provided on the outer wall of the middle section cylinder 15, and the second groove 12 is provided at the bottom of the pre-embedded end 16;

[0043] The pre-embedded end 16 is provided with a fixed contact 161 in the middle. The fixed contact 161 includes a channel 161a and a first screw hole 161b. The channel 161a and the first screw hole 161b are separated from each other. The inner sidewall of the channel 161a is provided with a plurality of annular grooves 161c. A first conductive spring contact finger 161d is provided in the annular groove 161c. A first wiring bolt 161e is provided in the first screw hole 161b.

[0044] The metal conductive component 17 includes a metal ring 171 embedded inside the flange ring 14, a metal sheet 172 embedded in the middle section cylinder 15, and a metal threaded sleeve 173 embedded in the embedded end 16. The metal threaded sleeve 173 is provided with a second connecting bolt 173a. The metal ring 171 is connected to the metal threaded sleeve 173 through the metal sheet 172.

[0045] This utility model of an insulating cylinder-type high-voltage fuse with status display function divides the insulating cylinder 1 into multiple parts and sets corresponding structures, such as the threaded ring 13, flange ring 14, intermediate cylinder 15, pre-embedded end 16 and metal conductive component 17, so that the insulating cylinder 1 has good connection performance, sealing performance and conductivity performance, while providing a reliable structural foundation for the installation and fixation of the fuse core 2, improving stability and reliability.

[0046] like Figure 4 As shown, the fused core 2 also includes a first conductive cap 22, a second conductive cap 23, and an insulating shell 24 surrounding the firing pin 21;

[0047] The bottom of the first conductive cap 22 is connected to the top of the insulating housing 24, and the top of the first conductive cap 22 is threaded to be threadedly connected to the plug-in handle 3.

[0048] The top of the second conductive cap 23 is connected to the bottom of the insulating housing 24, and the bottom of the second conductive cap 23 is provided with a metal rod 231 to connect with the first conductive spring contact finger 161d.

[0049] Preferably, the first conductive cap 22 and the second conductive cap 23 are made of conductive metal material (such as copper alloy) and their surfaces are silver-plated.

[0050] By setting the first conductive cap 22 and the second conductive cap 23, and by setting a thread on the top of the first conductive cap 22 to connect with the plug-in handle 3, and setting the metal rod 231 on the bottom of the second conductive cap 23 to connect with the first conductive spring contact finger 161d, a reliable connection between the molten core 2 and the plug-in handle 3 and an effective electrical connection between the molten core 2 and the insulating cylinder 1 are achieved, ensuring smooth current conduction.

[0051] To further increase the creepage distance, the fused core 2 also includes an insulating sleeve 25 disposed on the outer wall of the insulating housing 24. The insulating sleeve 25 includes a plurality of umbrella skirts 251, and the umbrella skirts are provided with venting channels 251a. Preferably, only one venting channel 251a is provided on each pair of adjacent umbrella skirts 251, and the venting channel 251a is "V" shaped.

[0052] It should be noted that the insulating sleeve 25 increases the creepage distance of the fuse element 2 and improves the insulation performance of the fuse element 2, enabling it to be used in power equipment with higher voltage levels. At the same time, the staggered "V"-shaped venting channels 251a between the upper and lower layers of the umbrella skirts 251 help to quickly discharge the generated gas during the melting process, prevent excessive internal pressure, and improve the safety and reliability of the fuse.

[0053] like Figure 5 As shown and Figure 6 As shown, the plug-in handle 3 also includes a metal sleeve 33 disposed at the bottom of the outer column 31. The inner wall of the metal sleeve 33 is threaded to be threadedly connected to the first conductive cap 22.

[0054] The indicator component 32 is equipped with a shock-absorbing washer 321;

[0055] Preferably, the overall cross-sectional shape of the indicator component 32 is "convex" shaped, and the bottom is provided with an indicator component groove 322 for the firing pin 21 to be connected; the fuse-broken state is indicated by a "broken" mark, which is provided on the side of the top of the indicator component 32.

[0056] The outer wall of the outer column 31 is provided with a column groove 312, and a third washer 313 is fitted into the column groove 312;

[0057] The outer wall of the metal sleeve 33 is provided with a metal sleeve groove 331, and the metal sleeve groove is fitted with a second conductive spring contact finger 332 to connect with the metal ring 171.

[0058] It should be noted that the metal sleeve 32 makes the connection between the plug-in handle 3 and the fuse core 2 more secure and reliable, and the two are tightly connected by a threaded connection; the shock-absorbing washer 321 on the outside of the indicator component 32 can effectively reduce the impact of vibration generated during the fuse-breaking process on the indicator component 32, and improve the stability and service life of the indicator component 32; the column groove 312 and the third washer 313 on the outer column 31, as well as the metal sleeve groove 331 and the second conductive spring contact finger 332 on the metal sleeve 33, further enhance the sealing performance and electrical connection performance between the plug-in handle 3 and the insulating cylinder 1, and improve the insulation and conductivity of the entire fuse.

[0059] like Figure 7 and Figure 8 As shown, the top of the sealing cover 4 is provided with a transparent observation window 41 for observing the indicator component 32;

[0060] Preferably, the transparent observation window 41 is made of a high-strength, flame-retardant, and corrosion-resistant solid insulating material, such as epoxy resin or polycarbonate.

[0061] The interior of the sealing cover 4 includes, from top to bottom, a first channel 42, a second channel 43, and a third channel 44;

[0062] The first channel 42 is used for the top of the indicating component 32 to pass through, and the bottom of the second channel 43 is provided with a third washer 431. The third channel 431 is a threaded hole for threaded connection with the outer wall of the threaded ring 13.

[0063] It should be noted that the transparent observation window 41 on the top of the sealing cover 4 allows the user to directly observe the status of the indicating component 32, thereby quickly determining whether the fuse 2 has melted, improving the maintenance efficiency of the equipment. The arrangement of the first channel 42, the second channel 43, and the third channel 44 inside the sealing cover 4, as well as the cooperation relationship between each channel, provides space for the movement of the indicating component 2, while ensuring a reliable connection and sealing performance between the sealing cover 4 and the insulating cylinder 1, further enhancing the insulation and waterproof performance of the entire fuse.

[0064] Preferably, in order to enhance the strength of the sealing cover 4 and facilitate screwing, the outer wall of the sealing cover 4 is provided with a number of reinforcing ribs 45.

[0065] To improve current conduction efficiency, both the first conductive spring contact 161d and the second conductive spring contact 332 are annular inclined coil conductive spring contacts (see details). Figure 9 The annular inclined conductive spring contact finger is made of high-conductivity beryllium bronze with a silver-plated surface.

[0066] The use of annular inclined conductive spring contacts makes the contact between the fuse core 2 and the conductive structure inside the insulating cylinder 1 more compact and reliable, effectively reducing contact resistance. At the same time, it can maintain a good electrical connection under the vibration and impact generated during the melting process, thus enhancing the stability and reliability of the fuse.

[0067] In terms of material selection, the insulating cylinder type high-voltage fuse with status display function of this utility model is made of high-strength flame-retardant and corrosion-resistant solid insulating material for the insulating cylinder 1, the plug-in handle 3 and the sealing cover 4. Preferably, the insulating cylinder 1 and the sealing cover 4 are made of epoxy resin, the outer column 31 and the indicating component 32 are made of epoxy resin, and the metal sleeve 33 is made of conductive metal material, such as copper alloy.

[0068] The conductive metal component 17 and the fixed contact are both made of conductive metal materials, such as copper alloy, and their surfaces are silver-plated. The insulating sleeve 25 is made of cold-shrink silicone rubber.

[0069] The insulating cylinder 1, sealing cap 4, outer column 31, and indicating component 32 are all made of epoxy resin. This material has high strength, flame retardancy, and corrosion resistance, ensuring long-term stable operation of these components in harsh environments. It also has good insulation properties, meeting the insulation requirements of the fuse. The metal sleeve 33 is made of conductive metal, ensuring good conductivity and enabling electrical connection between the fuse core 2 and the plug / pull handle 3. The strength of the metal material also ensures the structural stability of the metal sleeve, improving the overall performance of the fuse. The insulating sleeve 25 is made of cold-shrink silicone rubber. This material has good insulation and elasticity, allowing it to fit tightly against the outer wall of the insulating shell 24, effectively increasing the creepage distance and improving the insulation performance of the fuse, making it suitable for higher voltage-level power equipment. Simultaneously, the elasticity of the cold-shrink silicone rubber also provides a buffering effect when the fuse core melts, reducing the impact on the insulating shell 24 and further improving the safety and reliability of the fuse.

[0070] like Figure 10 and Figure 11 As shown below, the working status and the fuse-broken status of the insulating cylinder-type high-voltage fuse with status display function of this utility model are described:

[0071] For ease of explanation, Figure 10 and Figure 11 Only the engagement of the fuse 2 and the plug-in / plug-out handle 3 is shown. Figure 10 The indicator 32 protrudes from the top surface of the plug-in handle 3 when the fuse is broken, indicating the working status.

[0072] This utility model of an insulating cylindrical high-voltage fuse with status display function achieves a visual display of the status of the fuse element 2 by setting an indicator component 32 that is slidably connected to the outer column 31 and has a working status indicator. The top of the indicator component 32 is exposed by the striker pin 21 pressing against it, making it easy for users to intuitively judge whether the fuse element has melted, thereby improving the maintenance efficiency and safety of the equipment. Furthermore, the creepage distance is increased by setting the first groove 11 and the second groove 12, resulting in a small overall size and low cost.

[0073] This utility model of an insulating cylinder-type high-voltage fuse with status display function further enhances the overall sealing performance and electrical conductivity by meticulously dividing the structure of the insulating cylinder 1 and setting the threaded ring 13, flange ring 14, intermediate cylinder 15, pre-embedded end 16, and metal conductive component 17. The design of the fuse core 2, including the first conductive cap 22, the second conductive cap 23, the insulating shell 24, and the insulating sleeve 25, along with the detailed structure, not only ensures the stable connection between the fuse core 2 and the plug-in handle 3 and the fixed contact 161, but also increases the creepage distance through the insulating sleeve 25, improving the insulation performance and making it suitable for higher voltage level power equipment. The structure of the plug-in handle 3, including the metal sleeve 33, shock-absorbing washer 321, third washer 313, and second conductive spring contact finger 332, further enhances the stability and sealing of the connection, while ensuring the reliability of the electrical connection, making it universally applicable to power equipment of different voltage levels.

[0074] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. An insulated cylindrical high-voltage fuse with status display function, characterized in that, It includes an insulating cylinder, a fused core, a plug-in handle, and a sealing cap. The sealing cap is detachably connected to the top of the insulating cylinder, and the plug-in handle is detachably connected to the top of the fused core. Both the fused core and the plug-in handle are located between the insulating cylinder and the sealing cap. The outer wall of the insulating cylinder is provided with a plurality of first grooves, and the bottom of the insulating cylinder is provided with a plurality of second grooves, the second grooves extending upward from the bottom surface of the insulating cylinder along the axial direction of the insulating cylinder; The plug-in handle includes an outer column and an indicator component. The top of the indicator component is provided with a fuse status indicator. The indicator component is slidably connected to the inner wall of the outer column. The top surface of the outer column is provided with an opening for the top of the indicator component to pass through. The fused core includes a striker that, when in a melted state, presses against the indicator component so that the top of the indicator component passes through the opening.

2. The insulating cartridge type high-voltage fuse with a state display function according to claim 1, characterized by The insulating cylinder comprises, from top to bottom, a threaded ring, a flange ring, a middle section cylinder, a pre-embedded end, and a metal conductive component; The outer wall of the threaded ring is threaded to be threadedly connected to the sealing cap; A first washer is provided at the junction of the threaded ring and the flange ring, a washer groove is provided at the bottom of the flange ring, and a second washer is provided in the washer groove; The first groove is located on the outer wall of the middle section cylinder, and the second groove is located at the bottom of the pre-embedded end; The middle part of the pre-embedded end is provided with a fixed contact. The fixed contact includes a channel and a first screw hole. The channel and the first screw hole are separated from each other. The inner sidewall of the channel is provided with a plurality of annular grooves. A first conductive spring contact finger is provided in the annular grooves. A first wiring bolt is provided in the first screw hole. The metal conductive component includes a metal ring embedded inside the flange ring, a metal sheet embedded in the middle section cylinder, and a metal threaded sleeve embedded in the embedded end. The metal threaded sleeve is provided with a second connecting bolt, and the metal ring is connected to the metal threaded sleeve through the metal sheet.

3. The insulating cartridge type high-voltage fuse with a status display function according to claim 2, characterized by The fused core also includes a first conductive cap, a second conductive cap, and an insulating shell surrounding the firing pin; The bottom of the first conductive cap is connected to the top of the insulating housing, and the top of the first conductive cap is threaded to be threadedly connected to the plug-in handle. The top of the second conductive cap is connected to the bottom of the insulating housing, and the bottom of the second conductive cap is provided with a metal rod for connection with the first conductive spring contact finger.

4. The insulating cartridge type high-voltage fuse with a state display function according to claim 3, characterized by The fused core also includes an insulating sleeve disposed on the outer wall of the insulating shell, the insulating sleeve including a plurality of umbrella skirts, the umbrella skirts being provided with venting channels.

5. The insulating cylindrical high-voltage fuse with status display function according to claim 2 or 3, characterized in that, The plug-in handle also includes a metal sleeve located at the bottom of the outer column, the inner wall of which is threaded to be threadedly connected to the first conductive cap. The indicator component is fitted with a shock-absorbing washer; The outer wall of the outer column is provided with a column groove, and a third washer is fitted into the column groove; The outer wall of the metal sleeve is provided with a metal sleeve groove, and a second conductive spring contact finger is sleeved in the metal sleeve groove to connect with the metal ring.

6. The insulating cartridge fuse of claim 5, wherein The top of the sealing cover is provided with a transparent viewing window for observing the indicator component; The interior of the sealing cap includes, from top to bottom, a first channel, a second channel, and a third channel; The first channel is for the top of the indicator component to pass through, and the bottom of the second channel is provided with a third washer. The third channel is a threaded hole for threaded connection with the outer wall of the threaded ring.

7. The insulating cartridge fuse of claim 6, wherein The outer wall of the sealing cover is provided with several reinforcing ribs.

8. The insulating cartridge type high-voltage fuse with a state display function according to claim 6, characterized by Both the first conductive spring contact and the second conductive spring contact are annular inclined coil conductive spring contacts.

9. The insulating cartridge type high-voltage fuse with a status display function according to claim 6, characterized by The insulating cylinder and sealing cap are both made of epoxy resin, the outer column and the indicating component are both made of epoxy resin, and the metal sleeve is made of conductive metal material.

10. The insulating cartridge fuse of claim 4, wherein The insulating sleeve is made of cold-shrink silicone rubber.

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