Accelerated arc extinguishing structure of drop-out fuse

Abstract

The utility model relates to an accelerated arc extinguishing structure of a drop-out fuse, which comprises a fusion tube, a vulcanized fiber tube lined in the fusion tube, an upper moving contact arranged at the upper end of the fusion tube, a lower moving contact arranged at the lower end of the fusion tube, a fuse wire arranged in the vulcanized fiber tube, an upper end of the fuse wire fixedly contacted with the upper moving contact, and chutes arranged on the inner side wall of the lower end of the vulcanized fiber tube at intervals. The sliding groove is parallel to the central axis of the vulcanized fiber paper tube, strip-shaped protrusions are arranged on the peripheral side of the cylindrical plug at intervals, the strip-shaped protrusions are parallel to the central axis of the cylindrical plug, a through hole is formed in the center of the cylindrical plug along the central axis, and the cylindrical plug is installed at the lower end of the vulcanized fiber paper tube. The strip-shaped protrusions on the cylindrical plug are correspondingly clamped in the sliding grooves, the side wall of the cylindrical plug is in clearance fit with the inner side wall of the vulcanized fiber tube, the fuse wire penetrates through the through hole in the cylindrical plug and then is fixed to the lower moving contact, the fuse wire is tightened, the fuse wire and the through hole are bonded and fixed, and arc extinguishing can be accelerated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drop-out fuse, specifically relates to a drop-out fuse accelerated arc extinguishing structure. BACKGROUND

[0002] The working principle of the drop-out fuse can be divided into three stages of normal working, fault occurrence and fusing:

[0003] When working normally, the moving contact at both ends of the fuse tube pushes the upper moving contact into the protruding part of the "duck bill" and tightly contacts with the upper static contact by the tension of the fuse, forming a closed state. At this time, the current can normally flow through the fuse tube.

[0004] When a fault occurs, the excessive current will cause the fuse to melt and generate an arc. The steel tube lining in the fuse tube will decompose and generate a large amount of gas under the action of high temperature of the arc, and the gas will form high pressure in the fuse tube and be sprayed out of the lower end to blow out the arc.

[0005] After fusing, the tension of the fuse is lost, the movable joint is released, and the fuse tube rapidly falls under the action of the spring pressure of the upper and lower static contacts and the weight of the fuse tube itself, thereby cutting off the fault circuit.

[0006] The existing fuse fusing separates slowly, and a large amount of arc is generated in the separation process, which is not conducive to arc blowout. INVENTION CONTENTS

[0007] The utility model discloses a drop-out fuse accelerated arc extinguishing structure can accelerate arc extinguishing to solve the above technical insufficient.

[0008] The utility model discloses a drop-out fuse accelerated arc extinguishing structure, including the fuse tube, the steel tube lining in the fuse tube, the upper end of fuse tube is provided with the upper moving contact, the lower end of fuse tube is provided with the lower moving contact, the inside of steel tube is provided with the fuse, the upper end of fuse is in contact with the fixed upper moving contact, the lower end of steel tube is provided with the sliding slot on the inner side wall and interval, the sliding slot is parallel with the center axis of steel tube, still include the cylindrical plug, the side of cylindrical plug is provided with the strip protruding and interval, the strip protruding is parallel with the center axis of cylindrical plug, the center of cylindrical plug is provided with the through -hole along the center axis, cylindrical plug installs in the lower end of steel tube, the strip protruding on cylindrical plug corresponds and is connected in the sliding slot, the clearance fit between the side wall of cylindrical plug and the inner side wall of steel tube, the fuse is fixed on the lower moving contact after passing through the through -hole on cylindrical plug, and the fuse is taut, the diameter of fuse is equal to the inner diameter of through -hole, and the fuse is bonded and fixed with the through -hole.

[0009] The principle of the structure is that when the short circuit causes the fuse to melt, an arc is generated, the steel tube of the fuse tube lining is decomposed to generate a large amount of gas under the high temperature of the arc, the gas forms high pressure in the fuse tube, so that the cylindrical plug is quickly sprayed downward along the sliding groove, since the fuse is bonded and fixed with the through hole, the cylindrical plug can quickly pull the fuse, so that the fuse melting portion is quickly separated, the generation of the arc is reduced, and the large amount of gas generated by the decomposition is sprayed downward at the time of the spraying of the plug, and the arc is blown out.

[0010] Further, the fuse is knotted at the lower side of the through hole, when the cylindrical plug is quickly sprayed downward along the sliding groove, even if the bonding of the fuse with the through hole is loose, since the size of the knotted portion of the fuse is large, the cylindrical plug can still quickly pull the fuse, so that the fuse melting portion is quickly separated.

[0011] Further, in order to reduce the weight of the cylindrical plug, the cylindrical plug is coaxially provided with an annular groove at one end.

[0012] The accelerating arc extinguishing structure of the drop-out fuse obtained by the utility model has the beneficial effects that when the fuse is melted, the cylindrical plug can be quickly sprayed downward to pull the fuse, so that the fuse melting portion is quickly separated and the arc is accelerated to be extinguished. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model embodiment 1.

[0014] Figure 2 It is a partial enlarged view of the utility model embodiment 1. Figure 1

[0015] Figure 3 It is a structural schematic diagram of the cylindrical plug of the utility model embodiment 1. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects of the utility model are described in detail as follows by combining with the drawings and the preferred embodiments.

[0017] Embodiment 1:

[0018] As Figure 1 , 2 ​The utility model discloses a drop-out fuse accelerated arc extinguishing structure as shown in figures 1-3, which comprises a fuse tube 2, a steel paper tube 3 lined in the fuse tube 2, an upper moving contact 1 arranged at the upper end of the fuse tube 2, a lower moving contact 5 arranged at the lower end of the fuse tube 2, a fuse 4 arranged inside the steel paper tube 3, the upper end of the fuse 4 being in contact with and fixed to the upper moving contact 1, a sliding groove arranged at intervals on the inner side wall of the lower end of the steel paper tube 3, the sliding groove being parallel to the central axis of the steel paper tube 3, a cylindrical plug 6, a strip-shaped protrusion 7 arranged at intervals on the circumference of the cylindrical plug 6, the strip-shaped protrusion 7 being parallel to the central axis of the cylindrical plug 6, a through hole 10 arranged at the center of the cylindrical plug 6 along the central axis, the cylindrical plug 6 being installed at the lower end of the steel paper tube 3, the strip-shaped protrusion 7 on the cylindrical plug 6 being correspondingly clamped in the sliding groove, the side wall of the cylindrical plug 6 being in clearance fit with the inner side wall of the steel paper tube 3, the fuse 4 being fixed to the lower moving contact 5 after passing through the through hole 10 on the cylindrical plug 6, the fuse 4 being taut, the diameter of the fuse 4 being equal to the inner diameter of the through hole 10, and the fuse 4 being adhesively fixed to the through hole 10.

[0019] The principle of the above structure is that when the fuse 4 is blown due to short circuit, an electric arc is generated, the steel paper tube 3 lined in the fuse tube 2 will decompose to generate a large amount of gas under the action of high temperature of the electric arc, the gas will form high pressure in the fuse tube 2, thereby causing the cylindrical plug 6 to be quickly ejected downward along the sliding groove, since the fuse 4 is adhesively fixed to the through hole 10, the cylindrical plug 6 can quickly pull the fuse 4, so that the blown part of the fuse 4 is quickly separated, the generation of the electric arc is reduced, and at the same time, the large amount of gas generated by decomposition is ejected downward when the plug is ejected, thereby blowing out the electric arc.

[0020] In order to be more reliable, the fuse 4 at the lower side of the through hole 10 is knotted 9, even if the adhesion between the fuse 4 and the through hole 10 is loose when the cylindrical plug 6 is quickly ejected downward along the sliding groove, the cylindrical plug 6 can still quickly pull the fuse 4 due to the larger size of the knot 9 of the fuse 4, so that the blown part of the fuse 4 is quickly separated.

[0021] In order to reduce the weight of the cylindrical plug 6, an annular groove 8 is coaxially arranged at one end of the cylindrical plug 6.

Claims

1. A falling type fuse accelerated arc extinguishing structure, comprising a fuse tube (2), a steel paper tube (3) lining in the fuse tube (2), an upper movable contact (1) arranged at the upper end of the fuse tube (2), a lower movable contact (5) arranged at the lower end of the fuse tube (2), a fuse wire (4) arranged inside the steel paper tube (3), and the upper end of the fuse wire (4) being in contact and fixed with the upper movable contact (1), characterized in that, The lower end of the steel paper tube (3) is provided with a sliding groove on the inner side wall, the sliding groove is parallel to the central axis of the steel paper tube (3), and the cylindrical plug (6) is further provided. The cylindrical plug (6) is provided with a strip-shaped protrusion (7) on the circumference, the strip-shaped protrusion (7) is parallel to the central axis of the cylindrical plug (6), the central axis of the cylindrical plug (6) is provided with a through hole (10), the cylindrical plug (6) is installed at the lower end of the steel paper tube (3), the strip-shaped protrusion (7) on the cylindrical plug (6) is correspondingly clamped in the sliding groove, the side wall of the cylindrical plug (6) is in clearance fit with the inner side wall of the steel paper tube (3), the fuse (4) is fixed on the lower moving contact (5) after passing through the through hole (10) on the cylindrical plug (6), the fuse (4) is taut, the diameter of the fuse (4) is equal to the inner diameter of the through hole (10), and the fuse (4) is adhesively fixed with the through hole (10).

2. The accelerated arc quenching structure for a drop-out fuse of claim 1, wherein The fuse (4) on the lower side of the through hole (10) is knotted (9).

3. The accelerated arc quenching structure of a drop-out fuse of claim 2, wherein, The one end of the cylindrical plug (6) is coaxially provided with an annular groove (8).

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