Enclosed fuse tube based on high-voltage drop-out fuse

Abstract

The invention provides an enclosed fuse tube based on a high-voltage drop-out fuse. The fuse tube comprises a fuse tube assembly, a moving contact assembly and a first contact. Wherein the fuse tube assembly comprises a fuse tube, a fuse wire and a static contact, the fuse tube is provided with an observation window, the fuse wire is arranged in the fuse tube through a connecting wire, one end of the fuse tube is connected with the static contact, and the other end of the fuse tube is connected with the moving contact assembly; the moving contact assembly comprises a first spring and an ejector pin, one end of the ejector pin is connected with the fuse tube, and the other end of the ejector pin is connected with the first spring; the first contact is rotatably connected with the fuse tube assembly, whether the fuse is damaged or not can be observed through the observation window, if the fuse is damaged, the fuse can be replaced by rotating the first contact and popping up the fuse tube, the fuse cannot be damaged, and the problem that the fuse is broken and damaged due to uneven force in the fuse replacement process is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electric power equipment, and in particular to a closed fuse tube based on a high-voltage drop-out fuse. Background Art

[0002] High-voltage drop-out fuses are commonly used overload and short-circuit protection devices in distribution areas. They are used in 10kV distribution lines and the primary side of distribution transformers for protection. They are economical, easy to operate, and highly adaptable to outdoor environments. They are used in 10kV / 12KV distribution lines and one side of distribution transformers for protection and equipment switching operations. They are installed on the branch lines of high-voltage distribution lines to reduce the scope of power outages. Because they have an obvious disconnection point and have the function of an isolating switch, they create a safe working environment for the maintenance section lines and equipment and increase the sense of security of maintenance personnel. When installed on the distribution transformer, they can be used as the main protection of the distribution transformer. Therefore, they have been popularized in high-voltage distribution lines and distribution transformers.

[0003] In the actual operation of the 10kV distribution network line, due to the blowing of the fuse, the operation and maintenance personnel need to replace the fuse. When replacing the fuse, the operation and maintenance personnel need to first remove the damaged fuse and then use a wrench to unscrew the fuse, and then replace the fuse. During the replacement of the fuse, the fuse is often broken and damaged due to uneven force, and then the fuse is repeatedly replaced, which is not only time-consuming and labor-intensive, but also indirectly prolongs the power outage duration of the distribution transformer. Summary of the invention

[0004] The present application provides a closed fuse tube based on a high-voltage drop-out fuse to solve the problem of fuse breakage and damage caused by uneven force during fuse replacement.

[0005] The present application provides a closed fuse tube based on a high-voltage drop-out fuse, comprising: a fuse tube assembly, a moving contact assembly and a first contact; wherein the fuse tube assembly comprises a fuse tube, a fuse and a static contact, an observation window is provided on the fuse tube, the fuse is arranged in the fuse tube through a connecting wire, one end of the fuse tube is connected to the static contact, and the other end of the fuse tube is connected to the moving contact assembly; the moving contact assembly comprises a first spring and a ejector pin, one end of the ejector pin is connected to the fuse tube, and the other end of the ejector pin is connected to the first spring; the first contact is rotatably connected to the fuse tube assembly.

[0006] The fuse is separately arranged in the fuse tube, which can solve the problem of arc short circuit caused by the opening and closing operation of the distribution line and the distribution transformer and the problem of corrosion of the fuse that is difficult to replace.

[0007] When the fuse of the drop fuse blows, the maintenance personnel unscrew the first contact, and the first spring loses pressure to bounce the ejector pin, pushing the fuse tube to pop out. The maintenance personnel take out the fuse tube and observe whether the fuse is blown through the observation window on the fuse tube. If it is found to be blown, the fuse tube is replaced and the first contact is reconnected to the fuse tube assembly to complete the replacement, so as to solve the problem of fuse breakage and damage due to uneven force during fuse replacement.

[0008] Optionally, an end cover is further included, and the end cover is arranged at an end of the moving contact assembly away from the fuse tube.

[0009] Optionally, an insulating lead wire is further included, wherein the inside of the insulating lead wire is a wire, one end of the insulating lead wire is connected to the end cover, and the other end of the insulating lead wire is connected to the second contact. The insulating lead wire is connected to the end cover and the second contact, and when replacing the fuse, the insulating lead wire does not need to be disassembled, thereby improving replacement efficiency.

[0010] Optionally, it also includes an insulating tube and a connecting plate, wherein two ends of the insulating tube are connected to a first bracket and a second bracket, the first bracket is connected to the connecting plate, a connecting plate is connected to the connecting plate, the connecting plate is connected to the first contact, and the first contact is connected to the connecting plate through a second spring; a rotating part is connected to the second bracket, the rotating part includes a fixed plate and a rotating plate, the fixed plate is connected to the second bracket, the rotating plate is rotatably connected to the fixed plate, and the rotating plate is connected to the second contact.

[0011] The second spring can be used to resist the first contact to reduce the unstable connection between the first contact and the fuse tube assembly, which may cause the first contact to pop out; the rotating part is used to separate the fuse tube assembly from the first contact and adjust the angle to facilitate maintenance personnel to replace the fuse.

[0012] Optionally, it further includes an incoming line terminal and an outgoing line terminal, wherein the incoming line terminal is arranged on the first bracket, the outgoing line terminal is arranged on the second bracket, and the insulated lead wire extends to the outgoing line terminal through the second contact.

[0013] Optionally, it further includes an operating ring and a guide bracket, wherein the operating ring is connected to the fuse tube, the guide bracket is trumpet-shaped, and the guide bracket is arranged outside the fuse tube. When replacing, the operating ring can be pulled by an operating rod, so that the first contact can be separated from the fuse tube assembly for easy replacement.

[0014] Optionally, the stationary contact and the first contact are an integral structure, and the stationary contact and the first contact are made of copper.

[0015] Optionally, the middle portion of the fuse tube is made of insulating material, and both ends of the fuse tube are made of metal material.

[0016] Optionally, it further comprises a fuse tube housing, which is arranged outside the fuse tube, and an observation window is arranged on the fuse tube housing, and the window opening range of the observation window covers the area where the fuse is located.

[0017] Optionally, the surface where the moving contact assembly contacts the fuse tube is a plane, and the surface where the static contact contacts the fuse tube is a plane. A plane can increase the conductor contact surface, thereby reducing resistance, and will not cause discharge at sharp corners.

[0018] The present application provides a closed fuse tube based on a high-voltage drop-out fuse, the fuse tube comprising: a fuse tube assembly, a moving contact assembly and a first contact; wherein the fuse tube assembly comprises a fuse tube, a fuse and a static contact, an observation window is arranged on the fuse tube, the fuse is arranged in the fuse tube through a connecting wire, one end of the fuse tube is connected to the static contact, and the other end of the fuse tube is connected to the moving contact assembly; the moving contact assembly comprises a first spring and a ejector pin, one end of the ejector pin is connected to the fuse tube, and the other end of the ejector pin is connected to the first spring; the first contact is rotatably connected to the fuse tube assembly, and whether the fuse is damaged can be observed through the observation window. If damaged, the first contact is rotated, the fuse tube pops out, and the fuse can be replaced without damaging the fuse, so as to solve the problem of fuse breaking and damage due to uneven force during fuse replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 The schematic diagram of the structure of a closed fuse tube based on a high-voltage drop-out fuse is shown in an embodiment;

[0021] Figure 2 The figure is a schematic diagram of the structure of a closed fuse tube based on a high-voltage drop-out fuse according to another embodiment.

[0022] Illustration Description:

[0023] Among them, 100-first contact, 110-second contact, 200-fuse tube, 210-fuse, 220-static contact, 310-first spring, 320-thimble, 400-end cover, 500-insulated lead, 600-inlet end, 700-outlet end, 800-insulating tube, 810-first bracket, 820-second bracket, 830-connecting plate, 840-connecting plate, 900-guide bracket. DETAILED DESCRIPTION

[0024] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0025] During the operation of the distribution network line, if the fuse blows, the operation and maintenance personnel need to replace the fuse. When replacing the fuse, the operation and maintenance personnel need to first remove the damaged fuse and then use a wrench to unscrew the fuse, and then replace the fuse. Uneven force causes the fuse to break and be damaged, and then repeated replacement of the fuse is not only time-consuming and labor-intensive, but also indirectly prolongs the power outage duration of the distribution transformer.

[0026] See also Figure 1 , Figure 2 The embodiment of the present application provides a closed fuse tube based on a high-voltage drop-out fuse, including: a fuse tube assembly, a moving contact assembly and a first contact 100; wherein the fuse tube assembly includes a fuse tube 200, a fuse 210, and a static contact 220, an observation window is provided on the fuse tube 200, the fuse 210 is arranged in the fuse tube 200 through a connecting wire, one end of the fuse tube 200 is connected to the static contact 220, and the other end of the fuse tube 200 is connected to the moving contact assembly; the moving contact assembly includes a first spring 310 and a ejector pin 320, one end of the ejector pin 320 is connected to the fuse tube 200, and the other end of the ejector pin 320 is connected to the first spring 310; the first contact 100 is rotatably connected to the fuse tube assembly.

[0027] In some embodiments, the fuse tube further includes a fuse tube housing, which is disposed outside the fuse tube 200 and has an observation window, the window opening of which covers the area where the fuse 210 is located. One end of the static contact 220 is connected to the fuse tube 200, and the other end of the static contact 220 is connected to the fuse tube housing, and the fuse tube assembly is disposed inside the fuse tube housing.

[0028] The fuse housing may be a composite material pipe made of epoxy resin and glass fiber, which has a low density and excellent strength and can withstand high working pressure and load. Epoxy resin and glass fiber have good corrosion resistance in chemical corrosion and acid-base environments, and have a high heat resistance temperature, and can maintain structural stability and strength in high temperature environments. The fuse 210 can be protected.

[0029] The fuse shell can also be made of epoxy glass fiber and steel paper composite, which can enhance the rated breaking explosion resistance and small current breaking capacity of the fuse shell. In order to make the fuse shell have UV protection, UV protection insulating paint can be applied on the surface of the fuse shell, which can effectively extend the service life of the fuse shell.

[0030] Since the composite material pipe composed of epoxy resin and glass fiber is an opaque material, if it is necessary to directly observe whether the fuse 210 is damaged through the fuse shell, an observation window can also be set on the fuse shell. Since the fuse shell needs to have good protection, in some embodiments, the fuse shell includes a shell body and an observation window assembly, the observation window assembly is slidably connected to the shell body, a mounting hole is opened on the shell body, a slide is provided on the surface of the shell body close to the fuse tube 200, the observation window assembly includes a sliding plate and a handle, the sliding plate is provided with a slide, the sliding plate is slidably connected to the slide, and the handle is set at one end of the sliding plate.

[0031] For example, when it is necessary to observe whether the fuse 210 is damaged, the handle is used to make the sliding plate and the slideway slide relative to each other. Since the fuse tube 200 is also provided with an observation window, the state of the fuse 210 can be observed without disassembling the fuse tube shell, thereby improving work efficiency.

[0032] In some embodiments, the middle part of the fuse tube 200 is made of insulating material, and both ends of the fuse tube 200 are made of metal material. The middle part of the fuse tube 200 can be made of glass or ceramic. When the middle part of the fuse tube 200 is made of glass, the fuse 210 disposed in the fuse tube 200 can be directly observed; when the middle part of the fuse tube 200 is made of ceramic, since ceramic is mostly an opaque material, if it is necessary to observe the fuse 210 disposed in the fuse tube 200, an observation window needs to be opened on the fuse tube 200 so that the operation and maintenance personnel can observe the status of the fuse 210.

[0033] Both ends of the fuse tube 200 may be made of lead-tin alloy or lead-antimony alloy material, which has the characteristics of low melting point, high resistivity and fast fusing speed.

[0034] In some embodiments, the stationary contact 220 and the first contact 100 are an integral structure, and the material of the stationary contact 220 and the first contact 100 is copper. Copper has good conductor performance, and the first contact 100 plays a conductive role. Because it is necessary to keep the fuse in the closed working state, that is, the stationary contact 220 is in full contact with the first contact 100, in this embodiment, there is no need to provide pressure to the stationary contact 220 or the first contact 100, that is, the stationary contact 220 can be fully contacted with the first contact 100 to maintain the closed state.

[0035] The first contact 100 is rotatably connected to the fuse tube housing, and an internal thread is provided inside the fuse tube housing. The first contact 100 includes a connecting portion, and an external thread is provided on the outer surface of the connecting portion. The internal thread cooperates with the external thread to facilitate quick disassembly and assembly. When the internal thread is connected to the external thread, the fuse tube 200 is squeezed, so that the first spring 310 is in a compressed state. When the internal thread is separated from the external thread, the first spring 310 is in a relaxed state, and the first spring 310 drives the ejector pin 320 to move the fuse tube 200 out of the fuse tube housing, which is convenient for operation and maintenance personnel to take.

[0036] The height of the static contact 220 is higher than the moving contact assembly. Since arc light will be generated at the moment of contact, the height of the static contact 220 is higher than the moving contact assembly. The arc light and any molten metal will move freely downward and will not fall to other places and cause damage to other components. At the same time, it can maintain good stability when opening zero load. Finally, it can also reduce the gap between dust and impurities entering the contact.

[0037] When the fuse of the drop fuse blows, the operation and maintenance personnel unscrew the first contact 100, and the first spring 310 loses pressure to bounce the ejector pin 320, pushing the fuse tube 200 to pop out. The operation and maintenance personnel take out the fuse tube 200 and observe whether the fuse 210 is blown through the observation window on the fuse tube 200. If it is found to be blown, the fuse tube 200 is replaced and the first contact 100 is reconnected to the fuse tube assembly to complete the replacement, so as to solve the problem of the fuse 210 being broken and damaged due to uneven force during the replacement process.

[0038] The fuse 210, the moving contact and the stationary contact 220 of the enclosed fuse tube based on the high-voltage drop-out fuse provided in this embodiment are all arranged inside the fuse tube 200, which can not only prevent corrosion and welding, but also make it more convenient to carry out one-time replacement. The overall enclosed design improves the replacement efficiency, and the fuse 210 is arranged separately in the fuse tube 200, which can solve the problem of arc short circuit caused by the opening and closing operations of the distribution line and the distribution transformer and the problem of corrosion of the fuse 210 that is difficult to replace.

[0039] The upper end of the fuse tube 200 is rotatably connected to the first contact 100 to play a sealing role. In some embodiments, it also includes an end cover 400, which is arranged at one end of the moving contact assembly away from the fuse tube 200. At the lower end of the fuse tube 200, the end cover 400 provides support for the moving contact assembly, and the fuse tube 200 forms a closed space through the first contact 100 and the end cover 400, so that the fuse 210 in the fuse tube 200 is less affected by dust and impurities.

[0040] In some embodiments, an insulated lead wire 500 is also included, wherein the interior of the insulated lead wire 500 is a copper wire, one end of the insulated lead wire 500 is connected to the end cap 400, the other end of the insulated lead wire 500 is connected to the second contact 110, and the insulated lead wire 500 is also connected to the first contact 100 via the inlet terminal 600. The conductor of the insulated lead wire 500 is a soft copper wire strand, or a tinned soft copper wire.

[0041] In order to make the insulated lead 500 more protective, a protective sleeve can be connected to the outside of the insulated lead 500 to protect the insulated lead 500. The protective sleeve can be made of rubber material. For example, silicone rubber can be used, which can not only strengthen the mechanical external force of the insulated lead 500, but also increase the softness and wear resistance of the cable, thereby extending the service life of the cable.

[0042] In some embodiments, the fuse tube further includes an operating ring and a guide bracket 900, the operating ring is connected to the fuse tube 200, the guide bracket 900 is trumpet-shaped, and the guide bracket 900 is arranged outside the fuse tube 200. Exemplarily, the operating ring is sleeved on the fuse tube housing, when there is a fault current such as overload or short circuit, the fuse 210 may be blown, and the operating ring can be hooked by the insulating operating rod. Since the operating ring is sleeved on the fuse tube housing, the fuse tube housing and the fuse tube assembly can be removed to further replace the fuse 210.

[0043] The guide bracket 900 is configured to be trumpet-shaped. If the second spring is made of metal, it can provide a certain degree of protection to the second spring and reduce the arc generated by the conduction of the second spring. It is also convenient for installing the first contact 100.

[0044] In some embodiments, an insulating tube 800 and a connecting plate 830 are further included. The first bracket 810 and the second bracket 820 are connected to both ends of the insulating tube 800. The first bracket 810 is connected to the connecting plate 830. The connecting plate 830 is connected to a connecting piece 840. The connecting piece 840 is connected to the first contact 100. The first contact 100 is connected to the connecting plate 830 through a second spring. The second bracket 820 is connected to a rotating part. The rotating part includes a fixed plate and a rotating plate. The fixed plate is connected to the second bracket 820. The rotating plate is rotatably connected to the fixed plate. The rotating plate is connected to the second contact 110.

[0045] The surface of the connecting piece 840 is provided with a fixing hole, and the fixing hole is connected to the connection between the second spring and the first contact 100. Since the fuse is set outdoors, in order to protect the fuse tube assembly and reduce the flow of rainwater from the first contact 100 into the fuse tube 200, a waterproof cover can be connected to the outer surface of the connecting plate 830, the first bracket 810 and the second bracket 820 to play a waterproof role.

[0046] In some embodiments, an inlet terminal 600 and an outlet terminal 700 are also included. The inlet terminal 600 is arranged on a first bracket 810, and the outlet terminal 700 is arranged on a second bracket 820. The insulated lead 500 extends to the outlet terminal 700 through the second contact 110. It can be understood that an insulated lead 500 is also provided at the inlet terminal 600, and the insulated lead 500 of the inlet terminal 600 extends to the first contact 100 through the inlet terminal 600.

[0047] In order to reduce the possibility of operation and maintenance personnel accidentally touching the incoming terminal 600 and the outgoing terminal 700, an insulating cover may be provided outside the incoming terminal 600 and the outgoing terminal 700 to improve insulation.

[0048] In some embodiments, the surface where the moving contact assembly contacts the fuse tube 200 is a plane, and the surface where the stationary contact 220 contacts the fuse tube 200 is a plane. The contact surfaces between the contacts and the fuse tube 200 are both planes, and the conductor contact surface is large, thereby reducing resistance, preventing sharp-angle discharge, and increasing the contact surface between the contacts, so that the moving contact assembly and the stationary contact 220 are not easily corroded by arc light, effectively extending the service life of the overall equipment of the drop-out fuse, reducing unnecessary power outages, and ensuring power supply reliability.

[0049] The first contact 100 , the second contact 110 , the stationary contact 220 , and the ejector pin 320 of the moving contact assembly may all be silver-plated to improve the reliability of electrical contact.

[0050] The present application provides a closed fuse tube based on a high-voltage drop-out fuse, the fuse tube comprising: a fuse tube assembly, a moving contact assembly and a first contact 100; wherein the fuse tube assembly comprises a fuse tube 200, a fuse 210, and a stationary contact 220, an observation window is provided on the fuse tube 200, the fuse 210 is arranged in the fuse tube 200 through a connecting wire, one end of the fuse tube 200 is connected to the stationary contact 220, and the other end of the fuse tube 200 is connected to the moving contact assembly; the moving contact assembly comprises a first spring The fuse tube 200 is connected to the first spring 310 and the ejector pin 320, one end of the ejector pin 320 is connected to the fuse tube 200, and the other end of the ejector pin 320 is connected to the first spring 310; the first contact 100 is rotatably connected to the fuse tube assembly, and whether the fuse 210 is damaged can be observed through the observation window. If damaged, the first contact 100 is rotated and the fuse tube 200 is ejected, so that the fuse 210 can be replaced without damaging the fuse 210, so as to solve the problem of the fuse 210 being broken and damaged due to uneven force during the replacement of the fuse 210.

[0051] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A closed fuse tube based on a high voltage drop-out fuse, It is characterized in that include: A fuse tube assembly, a moving contact assembly and a first contact (100); The fuse tube assembly comprises a fuse tube (200), a fuse (210), and a static contact (220); an observation window is provided on the fuse tube (200); the fuse (210) is arranged in the fuse tube (200) through a connecting wire; one end of the fuse tube (200) is connected to the static contact (220); and the other end of the fuse tube (200) is connected to a moving contact assembly; The moving contact assembly comprises a first spring (310) and a ejector pin (320), one end of the ejector pin (320) is connected to the fuse tube (200), and the other end of the ejector pin (320) is connected to the first spring (310); The first contact (100) is rotatably connected to the fuse tube assembly.

2. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 1, It is characterized in that It also includes an end cover (400), wherein the end cover (400) is arranged at an end of the moving contact assembly away from the fuse tube (200).

3. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 2, It is characterized in that It also includes an insulating lead wire (500), the interior of the insulating lead wire (500) is a conductive wire, one end of the insulating lead wire (500) is connected to the end cover (400), and the other end of the insulating lead wire (500) is connected to a second contact (110).

4. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 3, It is characterized in that It also includes an insulating tube (800) and a connecting plate (830), wherein a first bracket (810) and a second bracket (820) are provided at both ends of the insulating tube (800), the first bracket (810) is connected to the connecting plate (830), a connecting piece (840) is connected to the connecting plate (830), the connecting piece (840) is connected to the first contact (100), and the first contact (100) is connected to the connecting plate (830) via a second spring; The second bracket (820) is connected to a rotating part, the rotating part comprises a fixed plate and a rotating plate, the fixed plate is connected to the second bracket (820), the rotating plate is rotatably connected to the fixed plate, and the rotating plate is connected to the second contact (110).

5. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 4, It is characterized in that It also includes an incoming line terminal (600) and an outgoing line terminal (700), wherein the incoming line terminal (600) is arranged on the first bracket (810), and the outgoing line terminal (700) is arranged on the second bracket (820), and the insulated lead wire (500) extends to the outgoing line terminal (700) through the second contact (110).

6. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 1, It is characterized in that It also comprises an operating ring and a guide bracket (900), wherein the operating ring is connected to the fuse tube (200), and the guide bracket (900) is trumpet-shaped and arranged outside the fuse tube (200).

7. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 1, It is characterized in that The stationary contact (220) and the first contact (100) are an integral structure, and the stationary contact (220) and the first contact (100) are made of copper.

8. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 1, It is characterized in that The middle part of the fuse tube (200) is made of insulating material, and both ends of the fuse tube (200) are made of metal material.

9. The enclosed fuse tube based on the high voltage drop fuse according to claim 1, It is characterized in that It also comprises a fuse tube housing, which is arranged outside the fuse tube (200), and an observation window is provided on the fuse tube housing, and the window opening range of the observation window covers the area where the fuse (210) is located.

10. The enclosed fuse tube based on the high voltage drop-out fuse according to claim 1, It is characterized in that The surface where the moving contact assembly contacts the fuse tube (200) is a plane, and the surface where the stationary contact (220) contacts the fuse tube (200) is a plane.

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