High-breaking low-permissible-energy fuse

Abstract

The utility model belongs to the technical field of fuses, and particularly relates to a high-breaking low-permissible-energy fuse, which comprises a shell and end covers arranged at two ends of the shell, and a sealed inner cavity is formed in the shell by the aid of the two end covers. The inner cavity is provided with a melt, two ends of the melt are respectively connected with two end covers, and the inner cavity is also filled with an arc extinguishing material; a conductive terminal is arranged on the outer side of the end cover, a connecting piece is arranged on one side of the conductive terminal and penetrates through the end cover to be connected with one end of the melt, a through hole is formed in the cross section of the melt, and breakpoints are formed on the two sides of the through hole. The cross section of the breakpoint is smaller than that of a single linear melt, and the breakpoint can ensure normal current of an external circuit to pass through. When the current of circuit overload or short circuit passes through the breakpoint of the fuse, the breakpoint can be quickly fused, the breaking capacity of the circuit is improved, the fuse is wrapped by the arc extinguishing substance, the arc extinguishing substance is used for absorbing the arc energy of fusing of the breakpoint, the safe use of the fuse is ensured, the circuit is prevented from being damaged, and the effects of high breaking and low connection are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fuse, especially relates to a high breaking low allowing energy fuse. BACKGROUND

[0002] The fuse refers to a kind of electrical apparatus, when current exceeds specified value, with heat generated by itself to make fuse melt, open circuit, widely used in power distribution system and power system.

[0003] For example, the Chinese patent document with publication number CN213304058U discloses a kind of high breaking fuse of quick replacement, including mounting seat, insulating support, left clamping piece, right clamping piece, connecting clamping piece, fuse, mounting seat upper end left and right sides each vertical fixed insulating support, the upper end of the insulating support of mounting seat upper end left side is vertically installed with left clamping piece, the upper end of the insulating support of mounting seat upper end right side is vertically installed with right clamping piece, left clamping piece lower part upper end left side is installed with connecting clamping piece, right clamping piece lower part upper end right side is installed with connecting clamping piece, left clamping piece and right clamping piece between horizontal hold fuse. Fuse includes replacement tube, left and right ends of replacement tube are respectively sleeved with left connecting cover and right connecting cover, left connecting cover and right connecting cover between horizontal fixed with fuse, replacement tube is filled with quartz sand.

[0004] From the technical scheme and drawing of the above patent document, the fuse is a straight-line type fuse, in high-current fuse, the cross-sectional area of straight-line type fuse is larger, when the current of circuit overload or short circuit passes, the melting time of fuse is longer, breaking capacity is not strong, it is easy to cause load too large, lead to the problem of serious damage of circuit. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of high breaking low allowing energy fuse, solve the problem that the melting time of existing fuse is long, breaking capacity is not strong, easy to damage circuit.

[0006] To achieve the above object, the utility model embodiment provides a kind of high breaking low allowing energy fuse, the fuse includes shell and the end cap being arranged at the both ends of shell, two the end cap makes the sealed inner cavity in the shell;The inner cavity is equipped with fuse, and the both ends of the fuse are connected with the end cap, and the inner cavity is also filled with arc extinguishing substance;The end cap outside is equipped with conducting terminal, and the conducting terminal one side is equipped with connecting piece, and the connecting piece passes through the end cap and connects one end of the fuse, and the cross section of the fuse is equipped with through-hole, and the through-hole both sides form breakpoint.

[0007] Further, the end cap is equipped with gasket, the connecting piece passes through the end cap and is connected with the gasket, and the gasket other side is welded to one end of the fuse.

[0008] Further, the cross-sectional area of the welding surface of the melt and the gasket is greater than the cross-sectional area of the melt in the inner cavity.

[0009] Further, a cap is arranged in the end cover, and the gasket is limited between the end cover and the cap; a through slot is arranged on the cap, and the end of the melt passes through the through slot and is bent into an L shape to form a bent part, which is arranged between the gasket and the cap.

[0010] Further, a plurality of through holes are arranged on the melt in the length direction to form a plurality of breaking points.

[0011] Further, a plurality of through holes are arranged on the cross section of the melt to reduce the width of the breaking points.

[0012] Further, the melt is in a strip shape or a wire shape.

[0013] The high-breaking and low-permitting energy fuse provided by the embodiment of the utility model has at least the following technical effects:

[0014] The end cover arranged at the two ends of the shell forms an inner cavity with the shell, the inner cavity is provided with the melt and the arc extinguishing substance, the outer side of the end cover is provided with the conductive terminal, one side of the conductive terminal is provided with the connecting piece, the connecting piece passes through the end cover to connect the melt, the conductive terminals of the two end covers are connected with the external circuit respectively, and the circuit conduction is realized through the connecting piece and the melt. Since the through hole is arranged on the cross section of the melt, the breaking points are formed on the two sides of the through hole, the breaking points are smaller than the cross section of the single straight line type melt, and the breaking points can guarantee the normal current passing of the external circuit. When the current of the circuit overload or short circuit passes the breaking points of the melt, the breaking points can be quickly fused, the breaking capacity of the circuit is improved, the arc extinguishing substance wraps the melt and is used for absorbing the arc energy of the fused breaking points, the safe use of the fuse is guaranteed, the circuit is prevented from being damaged, and the high-breaking and low-permitting effect is realized. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without the creative labor.

[0016] Fig. 1 The utility model provides the high-breaking and low-permitting energy fuse of the embodiment is the perspective view.

[0017] Fig. 2 The utility model provides the high-breaking and low-permitting energy fuse of the embodiment is the sectional view.

[0018] Fig. 3Part structure diagram of high breaking and low allowing energy fuse provided by the embodiment of the utility model.

[0019] In the figure, 10, shell, 11, inner cavity, 12, arc extinguishing substance;

[0020] 20, end cover, 21, gasket, 22, cap, 23, through slot;

[0021] 30, fuse body, 31, through hole, 32, breaking point, 33, bending part;

[0022] 40, conductive terminal, 41, connecting piece. DETAILED DESCRIPTION

[0023] The embodiment of the utility model is described in detail below, the example of the embodiment is shown in the drawing, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar function throughout. The embodiment described below by referring to the drawings is exemplary and is intended to explain the embodiment of the utility model, and cannot be understood as a limitation of the utility model.

[0024] In the description of the embodiment of the utility model, it should be understood that the orientation or position relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the embodiment of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0025] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiment of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0026] In the embodiment of the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiment of the utility model can be understood according to the specific circumstances.

[0027] In one embodiment of the high-breakage low-permitting energy fuse of the utility model, please refer to Figs. 1-3 The high-breakage low-permitting energy fuse comprises a shell 10 and end covers 20 arranged at both ends of the shell 10, and the two end covers 20 form a sealed inner cavity 11 in the shell. The inner cavity 11 is provided with a fuse body 30, and the two ends of the fuse body 30 are connected to the two end covers 20 respectively. The inner cavity 11 is also filled with arc extinguishing material 12. The outer side of the end cover 20 is provided with a conductive terminal 40, and the conductive terminal 40 is provided with a connecting piece 41 on one side. The connecting piece 41 passes through the end cover 20 and is connected to one end of the fuse body 30. The cross section of the fuse body 30 is provided with a through hole 31, and the two sides of the through hole 31 form a breaking point 32.

[0028] Specifically, the end covers 20 arranged at both ends of the shell 10 form an inner cavity 11 with the shell 10. The inner cavity 11 is provided with the fuse body 30 and the arc extinguishing material 12. The outer side of the end cover 20 is provided with the conductive terminal 40, and the conductive terminal 40 is provided with the connecting piece 41 on one side. The connecting piece 41 passes through the end cover and is connected to the fuse body 30, so that the conductive terminals 40 of the two end covers are connected to the external circuit respectively, and the circuit is realized by the connecting piece 41 and the fuse body 30. Because the cross section of the fuse body 30 is provided with the through hole 31, and the two sides of the through hole 31 form the breaking point 32, the breaking point 32 is smaller than the cross section of the single straight fuse, and the breaking point 32 can ensure the normal current of the external circuit. When the circuit overload or short-circuit current passes through the breaking point 32 of the fuse body, the breaking point 32 can be quickly fused, the breaking capacity of the circuit is improved, the arc extinguishing material 12 wraps the fuse body 30, absorbs the arc energy of the breaking point 32, ensures the safe use of the fuse, avoids the damage of the circuit, and realizes the effect of high-breakage low-permitting. Preferably, the fuse body 30 is in the shape of a strip or a wire, which facilitates the breaking point to be fused more quickly under the short-circuit current.

[0029] Further, the end cover 20 is provided with a gasket 21, the connecting piece 41 passes through the end cover 20 and is connected to the gasket 21, and the other side of the gasket 21 is welded to one end of the fuse body 30. Specifically, the gasket 21 can increase the contact area of the connecting piece 41 and the fuse body 30, and ensure the circuit transmission of the conductive terminal 40 and the fuse body 30.

[0030] Further, the welding surface cross-sectional area of the fuse body 30 and the gasket 21 is greater than the cross-sectional area of the fuse body 30 located in the inner cavity 11. Specifically, the cross-sectional area of the two ends of the fuse body 30 is greater than the cross-sectional area of the middle part, so that when the short-circuit current passes through the fuse, the middle part of the fuse body 30 will be fused first, and the arc extinguishing material 12 is used to extinguish the arc, without affecting the two ends of the fuse body 30, thereby protecting the safety of the circuit.

[0031] Further, the end cover 20 is further provided with a cap 22, and the gasket 21 is limited between the end cover 20 and the cap 22. The cap 22 is provided with a through slot 23, and the end of the fuse body 30 passes through the through slot 23 and is bent into an L shape to form a bent portion 33, and the bent portion 33 is arranged between the gasket 21 and the cap 22. Specifically, the gasket 21 is limited between the end cover 20 and the cap 22, so that the gasket 21 cannot be easily moved to affect the circuit transmission. The bent portion 33 formed by the end of the fuse body 30 passing through the through slot 23 is arranged between the gasket 21 and the cap 22, which increases the contact area of the gasket 21 and the bent portion 33 of the fuse body, further ensures the stability of the current transmission, and improves the heat dissipation effect of the two sides of the end cover 20. In addition, when the breaking point 32 of the fuse body is fused, the cap 22 can further protect the two end covers, so that the heat generated by the breaking point 32 and the heat absorbed by the arc extinguishing substance 12 do not directly contact the gasket 21, thereby protecting the external circuit.

[0032] Further, the fuse body 30 is provided with a plurality of through holes 31 in the length direction to form a plurality of breaking points 32. Specifically, the plurality of through holes 31 arranged in the length direction makes the fuse body 30 have a plurality of breaking points 32 in the length direction, which enhances the breaking capacity of the fuse body 30.

[0033] Further, the fuse body 30 is provided with a plurality of through holes 31 in the length direction to form a plurality of breaking points 32. Specifically, the plurality of through holes 31 arranged in the length direction makes the fuse body 30 have a plurality of breaking points 32 in the length direction, which enhances the breaking capacity of the fuse body 30.

[0034] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-breaking and low-let-through energy fuse, characterized by: The fuse includes a shell and end covers arranged at both ends of the shell, and the two end covers form a sealed inner cavity in the shell; the inner cavity is provided with a melt, and the two ends of the melt are respectively connected to the two end covers, and the inner cavity is also filled with arc-extinguishing material; a conductive terminal is provided on the outer side of the end cover, and a connecting piece is provided on one side of the conductive terminal, and the connecting piece passes through the end cover to connect to one end of the melt, and a through hole is provided on the cross section of the melt, and break points are formed on both sides of the through hole.

2. The high-breaking and low-let-through energy fuse according to claim 1, characterized in that: A gasket is provided in the end cover, the connecting piece passes through the end cover and is connected to the gasket, and the other side of the gasket is welded to one end of the melt.

3. The high-breaking and low-let-through energy fuse according to claim 2, characterized in that: The cross-sectional area of ​​the welding surface between the melt and the gasket is larger than the cross-sectional area of ​​the melt located in the inner cavity.

4. The high-breaking and low-let-through energy fuse according to claim 3, characterized in that: A cap is also provided inside the end cover, and the gasket is limited between the end cover and the cap; a through slot is provided on the cap, and the end of the melt passes through the through slot and is bent into an L shape to form a bending portion, and the bending portion is provided between the gasket and the cap.

5. The high-breaking and low-let-through energy fuse according to any one of claims 1 to 4, characterized in that: The melt is provided with a plurality of through holes along the length direction, forming a plurality of breakpoints.

6. The high-breaking and low-let-through energy fuse according to claim 5, characterized in that: A plurality of through holes are provided on the cross section of the melt to reduce the width of the breakpoint.

7. The high-breaking and low-let-through energy fuse according to claim 1, characterized in that: The melt is in ribbon or filament form.

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