A drop-out fuse

Abstract

The present application relates to a drop-out type fuse, and relates to the technical field of fuses, which comprises a fusion tube and an insulating porcelain bottle, wherein an upper conductive sleeve and a lower conductive sleeve are respectively fixedly provided at both ends of the fusion tube, a connecting frame is hingedly provided on the lower conductive sleeve, and a fixed shaft is fixedly provided on the connecting frame; an upper bracket and a lower bracket are fixedly provided at both ends of the insulating porcelain bottle, a static contact piece is fixedly provided on the upper bracket, and a placement notch for inserting the fixed shaft is opened on the lower bracket; a separation hook is hingedly provided on the outer periphery of the lower conductive sleeve through a rotating shaft, and a torsion spring is sleeved on the rotating shaft for making the separation hook buckle on the outer periphery of the fixed shaft; a pushing member for unlocking the separation hook and a fuse for controlling the pushing member are provided inside the fusion tube; an abutment plate is fixedly provided on the outer periphery of the lower conductive sleeve, an elastic conductive sheet is fixedly provided on the abutment plate, and a conductive protrusion that can be tightly abutted against the elastic conductive sheet is fixedly provided on the connecting frame; in the present application, the stability during current transmission is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fuses, and in particular to a drop-out type fuse. Background Art

[0002] A current limiting fuse is a fuse that can safely cut off all possible currents within its rated current and current limiting range. It limits the fusing time under rated voltage to be equal to or less than the first mainstream wave or symmetrical current wave, and limits the passing current to less than the peak current. This type of fuse is a type of high-voltage fuse, which is divided into two types: resistance current limiting and arc reactance conversion current limiting.

[0003] In the power system, a drop-out current-limiting fuse is a vital protection device. It ensures the safe operation of the circuit through unique structures such as insulating porcelain bottles, current-limiting fuse tubes and operating mechanisms. Among them, a magnetic core and a fuse wound on the magnetic core are installed inside the current-limiting fuse tube, and the two ends of the fuse are closely connected to the upper moving contact and the lower moving contact, respectively, to form a closed circuit of the circuit. The upper and lower ends of the insulating porcelain bottle are respectively fixed with an upper wiring board and a lower wiring board. The upper wiring board is provided with a static contact piece that is in close contact with the upper moving contact at the upper end of the current-limiting fuse tube, and the lower moving contact is rotatably connected to the upper hinged plate. When abnormal conditions such as overload or short circuit occur in the circuit, the current will increase rapidly, exceeding the load limit of the fuse, causing the fuse to melt, thereby cutting off the circuit to avoid further damage.

[0004] Since the lower moving contact at the end of the limit fuse tube abuts against the lower terminal board on the insulating porcelain bottle in a small area, when the circuit connected to the fuse is operating normally, especially in areas with strong winds, the abutment between the lower moving contact on the fuse tube and the lower terminal board may be challenged, and poor contact may easily occur. This poor contact phenomenon will not only affect the normal operation of the circuit, but may also cause the fuse to fail to effectively cut off the circuit at a critical moment, leading to more serious consequences. There is room for improvement. Utility Model Content

[0005] The purpose of the present application is to provide a drop-out fuse to solve the problem that the abutment between the upper moving contact and the stationary contact piece may become loose or deflected when the drop-out fuse is used in an area with strong winds.

[0006] The present application provides a drop-out fuse that adopts the following technical solution:

[0007] A drop-out fuse comprises a fusion tube and an insulating porcelain bottle, wherein an upper conductive sleeve and a lower conductive sleeve are fixedly provided at both ends of the fusion tube, a connecting frame is hinged on the outer circumference of the lower conductive sleeve, and a fixed shaft is fixed on the connecting frame; an upper bracket and a lower bracket are fixedly provided at both ends of the insulating porcelain bottle, a static contact piece abutting against the upper conductive sleeve is fixedly provided on the upper bracket, and a placement notch for inserting the fixed shaft is opened on the lower bracket; a separation hook is hinged on the outer circumference of the lower conductive sleeve through a rotating shaft, and a torsion spring for making the separation hook buckle on the outer circumference of the fixed shaft is sleeved on the rotating shaft; a pushing member for unlocking the separation hook and a fuse for controlling the pushing member are provided inside the fusion tube; an abutting plate is fixedly provided on the outer circumference of the lower conductive sleeve, an elastic conductive sheet is fixedly provided on the abutting plate, and a conductive protrusion capable of abutting against the elastic conductive sheet is fixedly provided on the connecting frame.

[0008] By adopting the above technical solution, when the circuit to which the fuse is connected operates normally, the static contact piece abuts against the upper conductive sleeve, and the separation hook buckles and locks the fixed shaft. Due to the coordinated arrangement of the elastic conductive piece and the conductive protrusion, the elastic conductive piece on the abutment plate is compressed and abuts against the conductive protrusion and can supply current, thereby improving the stability of current transmission and reducing the possibility of poor contact in bad weather.

[0009] Optionally, the side edges of the conductive bumps away from the connecting frame are rounded.

[0010] By adopting the above technical solution, since the edges of the conductive bumps are rounded, when the conductive bumps are pressed against the elastic conductive sheet, the possibility of the elastic conductive sheet being worn by the edges of the conductive bumps is reduced, thereby extending the service life of the elastic conductive sheet.

[0011] Optionally, a compression spring in a compressed state is fixedly disposed on a side surface of the upper bracket, and the other end of the compression spring is pressed against a side surface of the static contact piece away from the upper conductive sleeve.

[0012] By adopting the above technical solution, when the fuse is normally used, due to the installation setting of the extrusion spring, the static contact piece is pressed against the upper side surface of the upper conductive sleeve under the pressure of the extrusion spring, thereby reducing the possibility of loosening of the abutment between the static contact piece and the upper conductive sleeve and improving the stability during current transmission.

[0013] Optionally, a protrusion is provided on the side of the static contact piece away from the upper conductive sleeve, and the end of the compression spring away from the upper bracket is sleeved on the outside of the protrusion.

[0014] By adopting the above technical solution, due to the setting of the protrusion on the static contact piece, when the extrusion spring is in the process of extruding the static contact piece, the lower end of the extrusion spring is sleeved on the outer periphery of the protrusion, thereby reducing the possibility of deflection or dislocation of the extrusion spring during application and improving the installation stability of the extrusion spring.

[0015] Optionally, a limit screw is fixedly provided on the upper bracket, the extrusion spring is sleeved on the outer circumference of the limit screw, and the end of the limit screw away from the upper bracket abuts against the outer side surface of the protrusion.

[0016] By adopting the above technical solution, due to the installation setting of the limit screw, after the extrusion spring is installed, the limit screw is used to further limit the extrusion spring, thereby further improving the installation stability of the extrusion spring.

[0017] Optionally, a limiting groove for the end of the upper conductive sleeve away from the melting tube to be inserted is provided on the side of the protruding portion facing the upper conductive sleeve.

[0018] By adopting the above technical solution, due to the setting of the limiting slot, when the upper conductive sleeve is in the process of abutting against the static contact piece, the upper end of the upper conductive sleeve is inserted into the interior of the limiting slot, thereby improving the stability of the fuse during use.

[0019] Optionally, a plurality of reinforcing ridges are provided on the side of the static contact piece facing the upper conductive sleeve.

[0020] By adopting the above technical solution, the possibility of deformation of the static contact piece during application is reduced, and the structural strength of the static contact piece is improved.

[0021] Optionally, a pull ring is fixedly provided on the outer periphery of the upper conductive sleeve.

[0022] By adopting the above technical solution, it is convenient to drive the melting tube to turn downward through the pull ring.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Due to the coordinated arrangement of the elastic conductive sheet and the conductive protrusion, when the circuit to which the fuse is connected operates normally, the static contact piece abuts against the upper conductive sleeve, and the separation hook buckles and locks the fixed shaft. At this time, the elastic conductive sheet on the abutment plate is compressed and abuts against the conductive protrusion and can supply current, thereby improving the stability of current transmission and reducing the possibility of poor contact in bad weather. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments 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 creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 It is a schematic cross-sectional structure diagram of the installation and coordination of the melting tube in the embodiment of the present application;

[0028] Figure 3 It is a partial cross-sectional structural schematic diagram of the embodiment of the present application embodying the installation and matching of the elastic conductive sheet and the conductive bump;

[0029] Figure 4 It is a partial structural schematic diagram of the installation and coordination of the upper conductive sleeve and the static contact piece according to an embodiment of the present application.

[0030] In the figure, 1, melting tube; 11, fuse; 12, pushing member; 121, compression spring; 122, core rod; 2, upper conductive sleeve; 21, pull ring; 3, lower conductive sleeve; 31, connecting frame; 311, fixed shaft; 312, conductive protrusion; 32, separation hook; 33, torsion spring; 34, abutment plate; 35, elastic conductive sheet; 4, insulating porcelain bottle; 41, upper bracket; 42, lower bracket; 421, placement notch; 43, static contact sheet; 431, protrusion; 432, limit slot; 433, reinforcement convex strip; 44, extrusion spring; 45, limit screw. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0032] Example:

[0033] Reference Figure 1 , Figure 2 and Figure 3 A drop-out fuse includes a fuse tube 1 and an insulating porcelain bottle 4, wherein an upper conductive sleeve 2 and a lower conductive sleeve 3 are fixedly provided at both ends of the fuse tube 1, a connecting frame 31 is hinged on the outer periphery of the lower conductive sleeve 3, and a fixed shaft 311 is fixedly provided on the connecting frame 31; an upper bracket 41 and a lower bracket 42 are fixedly provided at both ends of the insulating porcelain bottle 4, a static contact piece 43 abutting against the upper conductive sleeve 2 is fixedly provided on the upper bracket 41, and a placement notch 421 for the fixed shaft 311 to be placed is opened on the lower bracket 42;

[0034] A separation hook 32 is hinged on the outer periphery of the lower conductive sleeve 3 through a rotating shaft, and a torsion spring 33 is sleeved on the rotating shaft for making the separation hook 32 buckle on the outer periphery of the fixed shaft 311; a pusher 12 for unlocking the separation hook 32 and a fuse 11 for controlling the pusher 12 are provided inside the fusion tube 1. Under normal conditions, the separation hook 32 is buckled on the fixed shaft 311 by the torsion of the torsion spring 33; when the fuse 11 is broken, the pusher 12 penetrates the lower conductive sleeve 3 and overcomes the torsion of the torsion spring 33, squeezing the separation hook 32 to release the lock on the fixed shaft 311.

[0035] Reference Figure 3A contact plate 34 is fixed on the outer periphery of the lower conductive sleeve 3, and an elastic conductive sheet 35 is fixed on the contact plate 34. A conductive protrusion 312 that can be tightly abutted against the elastic conductive sheet 35 is fixed on the connecting frame 31, and the side edge of the conductive protrusion 312 away from the connecting frame 31 is rounded; when the separation hook 32 buckles and locks the fixed shaft 311, the elastic conductive sheet 35 on the contact plate 34 is compressed and abuts against the conductive protrusion 312.

[0036] Reference Figure 2 and Figure 4 The pusher 12 includes a core rod 122 located inside the fuse tube 1, and a compression spring 121 located between the core rod 122 and the upper conductive sleeve 2, wherein the fuse 11 is wound around the outer periphery of the core rod 122, and the two ends of the fuse 11 are respectively connected to the upper conductive sleeve 2 and the lower conductive sleeve 3. This is a conventional structure and will not be repeated here.

[0037] Under normal conditions, the fuse 11 tightens the core rod 122 to compress the compression spring 121 ; when the fuse 11 breaks, the compression spring 121 squeezes the core rod 122 , so that the core rod 122 penetrates the lower conductive sleeve 3 and squeezes the separation hook 32 , thereby unlocking the separation hook 32 .

[0038] Reference Figure 2 and Figure 3 The upper conductive sleeve 2 and the lower conductive sleeve 3 are fixedly mounted on the upper and lower ends of the melting tube 1, and a pull ring 21 is integrally formed on the outer periphery of the upper conductive sleeve 2, so as to facilitate the melting tube 1 to be turned downward by the pull ring 21. At the same time, the separation hook 32, the connecting frame 31, the fixed shaft 311, the upper bracket 41 and the lower bracket 42 are all made of conductive metal.

[0039] Reference Figure 4 A compression spring 44 in a compressed state is fixedly arranged on the side of the upper bracket 41, and the other end of the compression spring 44 is pressed against the side of the static contact piece 43 away from the upper conductive sleeve 2; a protrusion 431 is arranged on the side of the static contact piece 43 away from the upper conductive sleeve 2, wherein a limiting groove 432 for the end of the upper conductive sleeve 2 away from the melting tube 1 to be inserted is opened on the side of the protrusion 431 facing the upper conductive sleeve 2, and the end of the compression spring 44 away from the upper bracket 41 is sleeved on the outside of the protrusion 431; the inner wall of the limiting groove 432 is an arc surface, and the outer side surface of the upper conductive sleeve 2 is also an arc surface.

[0040] Reference Figure 4 A limit screw 45 is fixed on the upper bracket 41, and the extrusion spring 44 is sleeved on the outer circumference of the limit screw 45. The end of the limit screw 45 away from the upper bracket 41 abuts against the outer side surface of the protrusion 431, so as to further limit and fix the extrusion spring 44. Moreover, since the limit screw 45 abuts against the outer side surface of the protrusion 431, the possibility of the extrusion screw being loosened during installation is also reduced.

[0041] A plurality of reinforcing ridges 433 are provided on the side of the stationary contact piece 43 facing the upper conductive sleeve 2 . The reinforcing ridges 433 are formed by stamping by a stamping device, so as to enhance the structural strength of the stationary contact piece 43 .

[0042] The implementation principle of the embodiment of the present application is:

[0043] When the circuit connected to the fuse operates normally, the static contact piece 43 abuts against the upper conductive sleeve 2, the separation hook 32 locks the fixed shaft 311, and the elastic conductive piece 35 on the abutting plate 34 is compressed and abuts against the conductive protrusion 312;

[0044] When the circuit is abnormal and the fuse 11 is broken, the compression spring 121 squeezes the core rod 122 , so that the core rod 122 penetrates the lower conductive sleeve 3 and overcomes the torsion force of the torsion spring 33 to squeeze the separation hook 32 , thereby unlocking the separation hook 32 and the fixed shaft 311 .

[0045] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A drop-out fuse, comprising a fusion tube (1) and an insulating porcelain bottle (4), wherein an upper conductive sleeve (2) and a lower conductive sleeve (3) are fixedly provided at both ends of the fusion tube (1), a connecting frame (31) is hingedly connected to the outer periphery of the lower conductive sleeve (3), and a fixed shaft (311) is fixedly provided on the connecting frame (31); an upper bracket (41) and a lower bracket (42) are fixedly provided at both ends of the insulating porcelain bottle (4), a stationary contact piece (43) abutting against the upper conductive sleeve (2) is fixedly provided on the upper bracket (41), and a placement notch (421) for the fixed shaft (311) to be placed is provided on the lower bracket (42); A separation hook (32) is hingedly connected to the outer periphery of the lower conductive sleeve (3) via a rotating shaft, and a torsion spring (33) is sleeved on the rotating shaft for making the separation hook (32) buckle on the outer periphery of the fixed shaft (311); a pusher (12) for unlocking the separation hook (32) and a fuse (11) for controlling the pusher (12) are provided inside the fusion tube (1); the characteristics are: An abutment plate (34) is fixedly provided on the outer periphery of the lower conductive sleeve (3), an elastic conductive sheet (35) is fixedly provided on the abutment plate (34), and a conductive protrusion (312) capable of tightly abutting against the elastic conductive sheet (35) is fixedly provided on the connecting frame (31).

2. A drop-out fuse according to claim 1, characterized in that: The side edge of the conductive protrusion (312) away from the connecting frame (31) is rounded.

3. A drop-out fuse according to claim 1, characterized in that: A compression spring (44) in a compressed state is fixedly disposed on the side surface of the upper bracket (41), and the other end of the compression spring (44) is pressed tightly against the side surface of the static contact piece (43) away from the upper conductive sleeve (2).

4. A drop-out fuse according to claim 3, characterized in that: A protrusion (431) is provided on the side of the stationary contact piece (43) away from the upper conductive sleeve (2), and the end of the compression spring (44) away from the upper bracket (41) is sleeved outside the protrusion (431).

5. A drop-out fuse according to claim 4, characterized in that: A limiting screw (45) is fixedly provided on the upper bracket (41), and the extrusion spring (44) is sleeved on the outer periphery of the limiting screw (45). The end of the limiting screw (45) away from the upper bracket (41) abuts against the outer side surface of the protrusion (431).

6. A drop-out fuse according to claim 4, characterized in that: A limiting slot (432) for the end of the upper conductive sleeve (2) away from the melting tube (1) to be inserted is provided on the side of the protruding portion (431) facing the upper conductive sleeve (2).

7. A drop-out fuse according to claim 1, characterized in that: A plurality of reinforcing convex strips (433) are arranged on the side of the stationary contact piece (43) facing the upper conductive sleeve (2).

8. A drop-out fuse according to claim 1, characterized in that: A pull ring (21) is fixedly provided on the outer periphery of the upper conductive sleeve (2).

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