CN222734920U

CN222734920U - A drop-out fuse

Info

Publication number: CN222734920U
Application number: CN202421524912.4U
Authority: CN
Inventors: 王明南; 林窈甸; 王松; 曹柱
Original assignee: Zhejiang Fuerte Electrical Apparatus Co ltd
Current assignee: Zhejiang Fuerte Electrical Apparatus Co ltd
Priority date: 2024-06-29
Filing date: 2024-06-29
Publication date: 2025-04-08
Anticipated expiration: 2034-06-29

Abstract

The application relates to the technical field of fuses, in particular to a drop-out fuse, which comprises a fusion tube and an insulating porcelain bottle, wherein an upper conductive sleeve and a lower conductive sleeve are respectively fixedly arranged at two ends of the fusion tube, a connecting frame is hinged to the lower conductive sleeve, a fixed shaft is fixedly arranged on the connecting frame, an upper support and a lower support are fixedly arranged at two ends of the insulating porcelain bottle, a static contact piece is fixedly arranged on the upper support, a placement notch for placing the fixed shaft is arranged on the lower support, a separation hook is hinged to the periphery of the lower conductive sleeve through a rotating shaft, a torsion spring for enabling the separation hook to be buckled on the periphery of the fixed shaft is sleeved on the rotating shaft, a pushing piece for unlocking the separation hook and a fuse wire for controlling the pushing piece are arranged inside the fusion tube, an abutting plate is fixedly arranged on the periphery of the lower conductive sleeve, and an elastic conductive piece is fixedly arranged on the abutting plate.

Description

Drop-out fuse

Technical Field

The application relates to the technical field of fuses, in particular to a drop-out fuse.

Background

A current limiting fuse is a fuse that can safely cut off all possible current within its cut-off rated current and current limiting range. It limits the fusing time at rated voltage to be equal to or less than the first main current wave or symmetrical current wave period, while limiting the passing current to be less than the peak current. The fuse is one type of high-voltage fuse and is divided into two types of resistance current limiting and arc reactance transformation current limiting.

In an electric power system, a drop-out current limiting fuse is an important protection device, and the drop-out current limiting fuse ensures the safe operation of a circuit through unique structures such as an insulating porcelain bottle, a current limiting fusion tube, an operating mechanism and the like. Wherein, the current-limiting fusion tube internally mounted has magnetic core and twines the fuse on the magnetic core, and wherein the both ends of fuse are closely connected with last moving contact and lower moving contact respectively, form the closed circuit of circuit. The upper and lower ends of the porcelain insulator are respectively fixed with an upper wiring board and a lower wiring board, the upper wiring board is provided with a static contact piece closely contacted with an upper moving contact at the upper end of the current-limiting fusion tube, and the lower moving contact is in rotary connection with the upper hinge plate. When an overload or short circuit and other abnormal conditions occur in the circuit, the current can rapidly increase and exceeds the bearing limit of the fuse, so that the fuse is blown, the circuit is cut off, and further damage is avoided.

Because the area of the lower moving contact at the end of the limiting fuse tube is smaller than the area of the lower wiring board abutting on the insulating porcelain bottle. When the circuit accessed by the fuse normally operates, particularly in a region with larger wind power, the abutting state between the lower moving contact on the fuse tube and the lower wiring board can be challenged, the problem of poor contact can easily occur, the phenomenon of poor contact can not only influence the normal operation of the circuit, but also can cause that the fuse cannot effectively cut off the circuit at a critical moment, further serious consequences are caused, and the improvement space exists.

Disclosure of utility model

The application aims to provide a drop-out fuse, which solves the problem that loose or deflection can occur in the abutting connection between an upper moving contact and a static contact when the drop-out fuse is applied to a region with large wind power.

The application provides a drop-out fuse which adopts the following technical scheme:

A drop-out fuse comprises a fusion tube and an insulating porcelain bottle, wherein an upper conductive sleeve and a lower conductive sleeve are respectively fixedly arranged at two ends of the fusion tube, a connecting frame is hinged to the periphery of the lower conductive sleeve, a fixed shaft is fixedly arranged on the connecting frame, an upper support and a lower support are respectively fixedly arranged at two ends of the insulating porcelain bottle, a static contact piece which is in butt joint with the upper conductive sleeve is fixedly arranged on the upper support, a placement notch for placing the fixed shaft is formed in the lower support, a separation hook is hinged to the periphery of the lower conductive sleeve through a rotating shaft, a torsion spring for enabling the separation hook to be buckled on the periphery of the fixed shaft is sleeved on the rotating shaft, a pushing piece for unlocking the separation hook and a fuse wire for controlling the pushing piece are arranged in the fusion tube, an abutting plate is fixedly arranged on the periphery of the lower conductive sleeve, an elastic conductive piece is fixedly arranged on the abutting plate, and a conductive lug which can be abutted against the elastic conductive piece is fixedly arranged on the connecting frame.

Through adopting above-mentioned technical scheme, when the circuit that this fuse inserted normally operates, static contact piece and last electrically conductive cover butt, when the separation hook was locked fixed axle lock, because the cooperation setting of elasticity conducting piece and conductive lug, the elasticity conducting piece on the butt board is pressed and with conductive lug butt and can supply current to carry this to stability when improving current and carrying reduces the bad possibility of contact when bad weather.

Optionally, the side edge of the conductive bump far away from the connecting frame is a round angle.

By adopting the technical scheme, as the edges of the conductive bumps are fillets, when the conductive bumps are propped against the elastic conductive sheet, the possibility that the elastic conductive sheet is worn by the edges of the conductive bumps is reduced, and the service life of the elastic conductive sheet is prolonged.

Optionally, the side of upper bracket has set firmly the extrusion spring that is in compression state, the other end of extrusion spring is held tightly with the side that the static contact kept away from the upper conductive sleeve.

Through adopting above-mentioned technical scheme, when the fuse normally uses, because extrusion spring's installation sets up, and the static contact piece supports tightly with the upside of last conductive sleeve under extrusion spring's extrusion to this reduces the static contact piece and goes up the likelihood that the butt between the conductive sleeve appears not hard up, improves the stability when the electric current transmission.

Optionally, the side of the static contact piece far away from the upper conductive sleeve is provided with a protruding part, and the end part of the extrusion spring far away from the upper bracket is sleeved outside the protruding part.

By adopting the technical scheme, due to the arrangement of the protruding part on the static contact, when the extrusion spring is in the extrusion process of the static contact, the lower end part of the extrusion spring is sleeved on the periphery of the protruding part, so that the possibility that the extrusion spring is deviated or misplaced in the application process is reduced, and the installation stability of the extrusion spring is improved.

Optionally, stop screw has set firmly on the upper bracket, extrusion spring cover is located on stop screw's periphery, stop screw keeps away from the tip and the lateral surface butt of bulge of upper bracket.

Through adopting above-mentioned technical scheme, because stop screw's installation setting, after extrusion spring installs, use stop screw to further spacing extrusion spring, further improved extrusion spring's installation stability.

Optionally, a limit clamping groove for clamping the end part of the upper conductive sleeve, which is far away from the melting pipe, is formed in the side surface of the protruding part, which faces the upper conductive sleeve.

Through adopting above-mentioned technical scheme, owing to the setting of spacing draw-in groove, when last electrically conductive cover is at the in-process to quiet contact butt, the upper end of going up electrically conductive cover inserts the inside to spacing draw-in groove this to this stability when using of fuse has been improved.

Optionally, a plurality of reinforcing raised strips are arranged on the side surface of the static contact sheet facing the upper conductive sleeve.

By adopting the technical scheme, the possibility of deformation of the static contact in the application process is reduced, and the structural strength of the static contact is improved.

Optionally, a pull ring is fixedly arranged on the periphery of the upper conductive sleeve.

By adopting the technical scheme, the melting pipe is conveniently driven to turn downwards through the pull ring.

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

1. Because the cooperation setting of elasticity conducting strip and conductive lug, when the circuit that this fuse inserted normally operates, static contact piece and last conductive sleeve butt, when the separation hook lock the fixed axle lock, the elasticity conducting strip on the butt board is pressed and with conductive lug butt and can supply power and carry this to stability when improving the electric current and carrying reduces the bad possibility of contact when bad weather.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic overall structure of an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present application embodying a fusion pipe installation fit;

FIG. 3 is a schematic view of a partially cut-away structure embodying the mounting engagement of the elastic conductive tab and conductive bump in an embodiment of the application;

fig. 4 is a schematic view of a partial structure of an embodiment of the present application showing the mounting engagement of the upper conductive sleeve and the stationary contact.

In the figure, 1, a fusion tube, 11, a fuse wire, 12, a pushing piece, 121, a pressure spring, 122, a core bar, 2, an upper conductive sleeve, 21, a pull ring, 3, a lower conductive sleeve, 31, a connecting frame, 311, a fixed shaft, 312, a conductive convex block, 32, a separating hook, 33, a torsion spring, 34, a butt plate, 35, an elastic conductive sheet, 4, an insulating porcelain bottle, 41, an upper bracket, 42, a lower bracket, 421, a placement notch, 43, a static contact sheet, 431, a convex part, 432, a limiting clamping groove, 433, a reinforcing convex strip, 44, a pressing spring and 45, a limiting screw.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings.

Examples:

Referring to fig. 1, 2 and 3, a drop-out fuse comprises a fusion tube 1 and an insulating porcelain bottle 4, wherein an upper conductive sleeve 2 and a lower conductive sleeve 3 are respectively and fixedly arranged at two ends of the fusion tube 1, a connecting frame 31 is hinged on the periphery of the lower conductive sleeve 3, a fixed shaft 311 is fixedly arranged on the connecting frame 31, an upper bracket 41 and a lower bracket 42 are respectively and fixedly arranged at two ends of the insulating porcelain bottle 4, a static contact piece 43 which is abutted with the upper conductive sleeve 2 is fixedly arranged on the upper bracket 41, and a placement notch 421 for placing the fixed shaft 311 is arranged on the lower bracket 42;

The lower conductive sleeve 3 is hinged with a separating hook 32 on the periphery through a rotating shaft, a torsion spring 33 for enabling the separating hook 32 to be buckled on the periphery of a fixed shaft 311 is sleeved on the rotating shaft, and a pushing piece 12 for unlocking the separating hook 32 and a fuse 11 for controlling the pushing piece 12 are arranged in the fusion tube 1. Normally, the separating hook 32 is buckled on the fixed shaft 311 through the torsion of the torsion spring 33, and when the fuse 11 breaks, the pushing piece 12 penetrates through the lower conductive sleeve 3 and overcomes the torsion of the torsion spring 33, and the separating hook 32 is extruded to release the locking of the fixed shaft 311.

Referring to fig. 3, an abutting plate 34 is fixedly arranged on the periphery of the lower conductive sleeve 3, an elastic conductive sheet 35 is fixedly arranged on the abutting plate 34, a conductive bump 312 capable of abutting against the elastic conductive sheet 35 is fixedly arranged on the connecting frame 31, the side edge of the conductive bump 312 away from the connecting frame 31 is a round angle, and when the separating hook 32 locks the fixing shaft 311 in a buckling manner, the elastic conductive sheet 35 on the abutting plate 34 is pressed and abuts against the conductive bump 312.

Referring to fig. 2 and 4, the pushing member 12 includes a core rod 122 located inside the fusion tube 1, 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 two ends of the fuse 11 are respectively connected with the upper conductive sleeve 2 and the lower conductive sleeve 3, which is a conventional structure and will not be described herein.

Normally, the fuse 11 tightens the core rod 122 to make the pressure spring 121 in a compressed state, and when the fuse 11 breaks, the pressure spring 121 presses the core rod 122 to make the core rod 122 penetrate through the lower conductive sleeve 3 and press the separating hook 32, so that the separating hook 32 is unlocked.

Referring to fig. 2 and 3, the upper conductive sleeve 2 and the lower conductive sleeve 3 are fixedly sleeved at the upper end and the lower end of the melting tube 1, and a pull ring 21 is integrally formed on the periphery of the upper conductive sleeve 2, so that the melting tube 1 is conveniently driven to turn downwards by the pull ring 21. Meanwhile, the separating hook 32, the connecting frame 31, the fixing shaft 311, the upper bracket 41 and the lower bracket 42 are all made of conductive metal materials.

Referring to fig. 4, a compression spring 44 in a compressed state is fixedly arranged on the side surface of the upper bracket 41, the other end of the compression spring 44 abuts against the side surface of the static contact piece 43, which is far away from the upper conductive sleeve 2, a protruding portion 431 is arranged on the side surface of the static contact piece 43, which is far away from the upper conductive sleeve 2, a limit clamping groove 432, into which the end portion, which is far away from the fusion tube 1, of the upper conductive sleeve 2 is clamped, is formed in the side surface of the protruding portion 431, the end portion, which is far away from the upper bracket 41, of the compression spring 44 is sleeved outside the protruding portion 431, the inner wall of the limit clamping groove 432 is an arc surface, and the outer side surface of the upper conductive sleeve 2 is also an arc surface.

Referring to fig. 4, a limit screw 45 is fixedly arranged on the upper bracket 41, the extrusion spring 44 is sleeved on the periphery of the limit screw 45, the end part of the limit screw 45 away from the upper bracket 41 is abutted against the outer side surface of the protruding part 431, so that the limit spring 44 is further limited and fixed, and the possibility of loose installation of the extrusion screw is reduced due to the fact that the limit screw 45 is abutted against the outer side surface of the protruding part 431.

The side surface of the static contact piece 43 facing the upper conductive sleeve 2 is provided with a plurality of reinforcing raised strips 433, and the reinforcing raised strips 433 are formed by stamping equipment, so that the structural strength of the static contact piece 43 is enhanced.

The implementation principle of the embodiment of the application is as follows:

When the circuit connected with the fuse works normally, the static contact piece 43 is abutted against the upper conductive sleeve 2, the separation hook 32 locks the fixed shaft 311 in a buckling way, and the elastic conductive piece 35 on the abutting plate 34 is pressed and abutted against the conductive bump 312;

When the circuit is abnormal and the fuse 11 breaks, the compression spring 121 presses the core bar 122, so that the core bar 122 penetrates the lower conductive sleeve 3 and presses the separation hook 32 against the torsion force of the torsion spring 33, thereby unlocking the separation hook 32 and the fixed shaft 311.

Unless defined otherwise, terms or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," "third," and the like, as used in this specification, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.

The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, wherein like reference numerals are used to refer to like elements throughout. Therefore, all equivalent changes according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. A drop-out fuse comprises a fusion tube (1) and an insulating porcelain bottle (4), wherein an upper conductive sleeve (2) and a lower conductive sleeve (3) are respectively fixedly arranged at two ends of the fusion tube (1), a connecting frame (31) is hinged to the periphery of the lower conductive sleeve (3), a fixed shaft (311) is fixedly arranged on the connecting frame (31), an upper support (41) and a lower support (42) are respectively fixedly arranged at two ends of the insulating porcelain bottle (4), a static contact piece (43) which is in butt joint with the upper conductive sleeve (2) is fixedly arranged on the upper support (41), and a placement notch (421) for placing the fixed shaft (311) is formed in the lower support (42);

The lower conductive sleeve (3) is hinged with a separation hook (32) through a rotating shaft, a torsion spring (33) for enabling the separation hook (32) to be buckled on the periphery of a fixed shaft (311) is sleeved on the rotating shaft, a pushing piece (12) for unlocking the separation hook (32) and a fuse wire (11) for controlling the pushing piece (12) are arranged inside the fusion tube (1), and the lower conductive sleeve is characterized in that an abutting plate (34) is fixedly arranged on the periphery of the lower conductive sleeve (3), an elastic conductive sheet (35) is fixedly arranged on the abutting plate (34), and a conductive convex block (312) capable of being abutted against the elastic conductive sheet (35) is fixedly arranged on the connecting frame (31).

2. A drop-out fuse as claimed in claim 1, wherein the side edges of the conductive bumps (312) remote from the connecting frame (31) are rounded.

3. The drop-out fuse of claim 1, wherein a compression spring (44) in a compressed state is fixedly arranged on the side surface of the upper bracket (41), and the other end of the compression spring (44) abuts against the side surface of the static contact piece (43) far away from the upper conductive sleeve (2).

4. A drop-out fuse as claimed in claim 3, wherein the side of the stationary contact (43) away from the upper conductive sleeve (2) is provided with a protrusion (431), and the end of the pressing spring (44) away from the upper bracket (41) is sleeved outside the protrusion (431).

5. The drop-out fuse of claim 4, wherein a limit screw (45) is fixedly arranged on the upper bracket (41), the extrusion spring (44) is sleeved on the periphery of the limit screw (45), and the end part of the limit screw (45) away from the upper bracket (41) is abutted against the outer side surface of the protruding part (431).

6. The drop-out fuse of claim 4, wherein the side of the protruding portion (431) facing the upper conductive sleeve (2) is provided with a limit slot (432) into which the end of the upper conductive sleeve (2) far from the fusion tube (1) is clamped.

7. A drop-out fuse according to claim 1, wherein the side of the stationary contact (43) facing the upper conductive sleeve (2) is provided with reinforcing ribs (433).

8. A drop-out fuse as claimed in claim 1, wherein a pull ring (21) is fixedly provided on the outer periphery of the upper conductive sleeve (2).