Indicator for high-voltage fuse

Abstract

The utility model relates to the technical field of high-voltage fuses, in particular to an indicator for a high-voltage fuse, which comprises a porcelain fuse tube, tube covers are arranged at two ends of the porcelain fuse tube, an indicating fuse is arranged in the porcelain fuse tube, an installation cylinder is arranged at one end in the porcelain fuse tube, and the indicating fuse is arranged in the installation cylinder. One end of the indicating melt is connected with the pipe cover away from one end of the mounting cylinder, the other end of the indicating melt extends into the mounting cylinder, a spring is arranged in the mounting cylinder, one end of the spring is connected with the inner wall of the mounting cylinder, the other end of the spring is provided with a pressing block, and the pressing block is connected with one end, located in the mounting cylinder, of the indicating melt and compresses the spring; an insulating block is further arranged on the pipe cover close to the mounting cylinder, a pressing switch, a battery and a lamp bead which are electrically connected are arranged on the insulating block, the pressing switch is located on the side, away from the spring, of the pressing block, the spring drives the pressing block to extrude and trigger the pressing switch when returning to the original state, and the lamp bead is located outside the porcelain fuse pipe. According to the application, an inspector can conveniently and quickly check out the fused fuse.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage fuses, in particular to an indicator for high-voltage fuses. Background Art

[0002] A fuse's function is to provide short-circuit and overload protection by melting its fuse element when the current exceeds a specified value after a certain period of time, thereby opening the circuit. Despite its small size, a fuse can interrupt very high short-circuit currents. Fuses can be divided into high-voltage and low-voltage fuses. In power transmission and distribution systems, high-voltage fuses are widely used for short-circuit and overload protection of electrical equipment such as high-voltage transmission and distribution lines, power transformers, voltage transformers, and power capacitors, for small, less critical loads. For indoor lines, the RN series of high-voltage tubular current-limiting fuses are widely used. The RN series of indoor high-voltage tubular fuses are primarily used for short-circuit and overload protection in 3kV to 35kV distribution systems. The RN1 type is designed for short-circuit protection of high-voltage power lines, their equipment, and power transformers, and can also provide overload protection.

[0003] The RN1 high-voltage fuse consists of a porcelain tube with brass caps welded to each end. Both caps are attached to form a sealed fuse tube structure. A working element and an indicating element are housed within the tube, each connected to the corresponding caps. The tube is filled with quartz sand. The element is typically made of silver, copper, or other materials in the form of thin filaments. Small tin balls are contained within the tube to lower its melting point. When a short circuit occurs in the circuit protected by the fuse, the element melts and forms an arc. This arc forms close contact with the surrounding quartz sand. Because arc extinguishing is accelerated by contact with a solid dielectric, the arc is extinguished before the short-circuit current reaches its maximum instantaneous value, thereby limiting the short-circuit current. A blown fuse indicator is provided at one end of the indicating fuse. When the fuse is operating normally, the indicating fuse pulls the blown fuse indicator so that the blown fuse indicator is located inside the tube cover. When the working fuse blows, the indicating fuse will also blow synchronously, and the spring will extend to push the indicator out, indicating that the fuse has blown.

[0004] In the related art, when inspecting lines or electrical equipment, inspectors need to check all fuses one by one to see if there is a fuse with an indicator pushed out, and then troubleshoot line faults. However, since each fuse needs to be checked and the fuse indicator is not obvious enough, inspectors need to check carefully, especially when there are a large number of fuses to be checked and the light is dim, which will cause inspectors to spend more time troubleshooting fuses, bringing inconvenience to the inspection work. Utility Model Content

[0005] The utility model aims to provide an indicator for a high-voltage fuse, so as to solve the problem that the blown fuse indication of the indicator is not obvious enough and thus it takes a lot of time for inspectors to check the circuit.

[0006] The utility model is achieved through the following technical solutions:

[0007] The cam is secured to the inner wall of the cam and is secured to the outer wall of the cam, wherein the cam is secured to the inner wall of the cam and is insulated from the outer wall of the cam. The cam is secured to the outer wall of the cam and is insulated from the outer wall of the cam.

[0008] Furthermore, one end of the mounting tube is connected to the corresponding pipe cover, and the mounting tube is arranged near one end opening of the corresponding pipe cover. A mounting hole is provided on the pipe cover connected to the mounting tube, and the inner hole wall of the mounting hole is provided with an internal thread, and the outer wall of the insulating block is provided with an external thread. One end of the insulating block extends into the mounting hole and is threadedly connected to the pipe cover, and the push switch is located in the mounting tube.

[0009] Furthermore, a limit block is provided on the outer wall of the insulating block, and the limit block is used to limit the maximum length of the insulating block extending into the interior of the mounting cylinder.

[0010] Furthermore, a transparent shield is provided on the insulating block, and the lamp beads are located inside the transparent shield.

[0011] Furthermore, the transparent shield is red.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0013] In the present utility model, when the current passing through the fuse exceeds the specified value, the indicator fuse heats up and melts, and the spring loses its tensioning limiting force and stretches to its original state. When the spring stretches, it will drive the pressure block to squeeze the push switch, causing the circuit inside the push switch to be turned on, and then causing the circuit of the battery, push switch and lamp bead to be turned on. At this time, the lamp bead emits a bright light, indicating that the fuse corresponding to the lamp bead has blown. The fuse is indicated by the lighting of the lamp bead, which can increase the conspicuousness of the fuse indication, making it easier for inspectors to quickly find the blown fuse and then replace the fuse, which is beneficial to reduce the time spent by inspectors in troubleshooting the circuit, and brings convenience to the inspectors' inspection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention.

[0015] In the attached figure:

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 For the utility model Figure 1 Enlarged view of part A in the middle.

[0018] Markings and corresponding parts names in the accompanying drawings:

[0019] 1. Porcelain melting tube; 2. Tube cover; 3. Indicating melt; 4. Mounting tube; 5. Spring; 6. Pressure block; 7. Insulation block; 8. Push switch; 9. Battery; 10. Lamp bead; 11. Conductive part; 12. Mounting hole; 13. Transparent protective cover; 14. Limit block. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the following examples and accompanying drawings. The exemplary embodiments and descriptions of the present invention are intended only to explain the present invention and are not intended to limit the present invention. It should be noted that the present invention is already in the stage of actual development and use.

[0021] Example 1

[0022] An indicator for high voltage fuses, referring to Figure 1 、 Figure 2, including a porcelain melting piece tube 1, a tube cover 2 is provided at both ends of the porcelain melting piece tube 1, an indicating melt 3 is provided between the two tube covers 2, a mounting cylinder 4 is provided at one end inside the porcelain melting piece tube 1, one end of the indicating melt 3 is connected to the tube cover 2 away from the end of the mounting cylinder 4, and the other end extends to the inside of the mounting cylinder 4, a spring 5 is provided inside the mounting cylinder 4, one end of the spring 5 is connected to the inner wall of the mounting cylinder 4, and a pressure block 6 is provided at the other end, the pressure block 6 is connected to the end of the indicating melt 3 located inside the mounting cylinder 4, and the pressure block 6 compresses the spring 5, close to the mounting cylinder An insulating block 7 is also provided on the tube cover 2 of the mounting tube 4. A push switch 8, a battery 9, and a lamp bead 10 are provided on the insulating block 7. The push switch 8 is located on the side of the pressure block 6 away from the spring 5. When the spring 5 returns to its original state, it drives the pressure block 6 to squeeze and trigger the push switch 8. The battery 9, the push switch 8, and the lamp bead 10 are electrically connected. The circuit connection method between the battery 9, the push switch 8, and the lamp bead 10 is common knowledge that can be mastered by those skilled in the art, so it will not be described here. The lamp bead 10 is located outside the porcelain melting tube 1. Among them, one end of the indicator melt 3 is connected to the tube cover 2 away from one end of the mounting tube 4, and the other end is electrically connected to a conductive member 11. The conductive member 11 is connected to the other tube cover 2. The melting point of the conductive member 11 is higher than that of the indicator melt 3, ensuring that the indicator melt 3 melts before the conductive member 11.

[0023] In this solution, when the current passing through the fuse exceeds the specified value, the indicator fuse 3 heats up and melts, and the spring 5 loses its tensioning limiting force and stretches to its original state. When the spring 5 stretches, it will drive the pressure block 6 to squeeze the press switch 8, causing the circuit inside the press switch 8 to be turned on, and then causing the circuit of the battery 9, the press switch 8 and the lamp bead 10 to be turned on. At this time, the lamp bead 10 emits a bright light, indicating that the fuse corresponding to the lamp bead 10 has been blown. The fuse is indicated by the light of the lamp bead 10, which can increase the conspicuousness of the blown indication, making it easier for inspectors to quickly find the blown fuse and then replace the fuse, which is conducive to reducing the time spent by inspectors to check the circuit and brings convenience to the inspectors' inspection work.

[0024] Example 2

[0025] Based on Example 1, in this example, Figure 1 、 Figure 2One end of the mounting tube 4 is connected to the corresponding pipe cover 2. The mounting tube 4 is positioned near the opening at one end of the corresponding pipe cover 2. A mounting hole 12 is formed on the pipe cover 2 connected to the mounting tube 4. The inner wall of the mounting hole 12 is provided with an internal thread. The outer wall of the insulating block 7 is provided with an external thread. One end of the insulating block 7 extends into the mounting hole 12 and is threadedly connected to the pipe cover 2. The push switch 8 is located within the mounting tube 4. The insulating block 7 is threadedly connected to the pipe cover 2, facilitating assembly and enabling a sealing arrangement of the pipe cover 2. A limit block 14 is provided on the outer wall of the insulating block 7. The limit block 14 is used to limit the maximum length of the insulating block 7 extending to the inside of the mounting tube 4. When assembling the insulating block 7, the limit block 14 can be pressed against the outer wall of the tube cover 2, which can facilitate the assembly of the insulating block 7 to the specified position and further seal the mounting hole 12. When the indicating fuse 3 is blown, the spring 5 can drive the pressure block 6 to squeeze the press switch 8, thereby turning on the power supply of the lamp bead 10, so that the lamp bead 10 lights up for indication.

[0026] Example 3

[0027] Based on Example 2, in this example, referring to Figure 1 、 Figure 2 A transparent shield 13 is provided on the insulating block 7, and the lamp bead 10 is located inside the transparent shield 13. The transparent shield 13 is red. The transparent shield 13 can be made of glass or transparent plastic. The transparent shield 13 can protect the lamp bead 10. The bright red color of the transparent shield 13 can enhance the indicating effect when the lamp bead 10 is lit.

[0028] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. An indicator for a high-voltage fuse, comprising a porcelain fuse tube (1), with tube covers (2) provided at both ends of the porcelain fuse tube (1), and an indicating fuse (3) provided between the two tube covers (2), characterized in that: A mounting tube (4) is provided at one end of the interior of the porcelain melt tube (1); one end of the indicating melt (3) is connected to a tube cover (2) away from one end of the mounting tube (4); the other end extends into the interior of the mounting tube (4); a spring (5) is provided inside the mounting tube (4); one end of the spring (5) is connected to the inner wall of the mounting tube (4); the other end is provided with a pressing block (6); the pressing block (6) is connected to one end of the indicating melt (3) located inside the mounting tube (4), and the pressing block (6) compresses the spring (5); the indicating melt (3) is connected to the inner wall of the mounting tube (4) via the conductive member (11). The invention relates to a pipe cover (2) close to the mounting tube (4); an insulating block (7) is further provided on the pipe cover (2) close to the mounting tube (4); a push switch (8), a battery (9) and a lamp bead (10) are provided on the insulating block (7); the push switch (8) is located on the side of the pressing block (6) away from the spring (5); when the spring (5) returns to its original state, it drives the pressing block (6) to squeeze and trigger the push switch (8); the battery (9), the push switch (8) and the lamp bead (10) are electrically connected, and the lamp bead (10) is located outside the porcelain melting piece tube (1).

2. An indicator for a high-voltage fuse according to claim 1, characterized in that: One end of the mounting tube (4) is connected to the corresponding pipe cover (2), and the mounting tube (4) is arranged close to the opening of one end of the corresponding pipe cover (2). The pipe cover (2) connected to the mounting tube (4) is provided with a mounting hole (12), the inner hole wall of the mounting hole (12) is provided with an internal thread, the outer wall of the insulating block (7) is provided with an external thread, one end of the insulating block (7) extends into the mounting hole (12) and is threadedly connected to the pipe cover (2), and the push switch (8) is located in the mounting tube (4).

3. An indicator for a high-voltage fuse according to claim 2, characterized in that: A limit block (14) is provided on the outer wall of the insulating block (7), and the limit block (14) is used to limit the maximum length of the insulating block (7) extending to the inside of the mounting cylinder (4).

4. An indicator for a high-voltage fuse according to claim 3, characterized in that: A transparent protective cover (13) is provided on the insulating block (7), and the lamp bead (10) is located inside the transparent protective cover (13).

5. The indicator for a high-voltage fuse according to claim 4, characterized in that: The transparent shield (13) is red.

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