Fusible body structure

Abstract

The utility model provides a fusible body structure, which is characterized in that a fusible body is erected between diagonal angles at two ends of a fuse tube body, two ends of the fusible body are respectively welded and fixed with two end caps of a fuse, the fusible body is in a sheet shape, and two end parts of the fusible body in the length direction are respectively provided with a hook part and at least one bending part; the hook part is bent towards the outer wall of the fuse tube body and is hooked and welded between the inner wall of the end cap side and the outer wall of the tube body; and the bending part is bent towards the inner side of the pipe body and is combined with the soldering tin on the bottom wall of the end cap. Therefore, the fusible body structure provided by the utility model has better welding stability and fusing stability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit overcurrent protection device, and particularly relates to a fusible body structure. BACKGROUND

[0002] Fuse (safety wire) is a kind of electrical appliance that when current exceeds the specified value, the heat generated by itself makes the fusible body fuse, disconnects the circuit and protects the circuit.

[0003] In the prior art, the tubular fuse structure includes a pipe body with an open end at both ends, a fusible body arranged in the pipe body, and end caps matched with both ends of the pipe body, wherein the fusible body is located between the two end caps of the pipe body by being welded on the solder in the end caps. The end cap can be a copper cap, which is generally electroplated, such as nickel plating, tin plating or gold plating. The solder is pre-fused to be fused together with the copper cap. The pipe body is generally made of ceramic or glass, and the fusible body is generally fixed in the pipe body by diagonal welding or straight welding, and the fusible body, the copper cap and the pipe body are welded together by the solder to form a complete device.

[0004] Among them, when the straight welding method is used, the solder at the end of the later welding and the fusible body are difficult to combine due to air extrusion, and the solder can be extruded out of the pipe body by air, resulting in virtual welding or unstable welding. Therefore, in general, the stability of straight welding is not as reliable as diagonal welding, and therefore, more small fuses use diagonal welding.

[0005] When diagonal welding is adopted, the end portions of the fusible body at both ends are bent towards the outer wall of the pipe body, and then welded and fixed by using the solder. However, diagonal welding also has certain defects. In addition to the fact that the fusible body is easy to fuse at the bent end portion, the fusible body also has a certain thickness and width, so that after being bent, the fusible body protrudes from the outer wall of the pipe body. After the end cap is connected by the solder, the end cap is pushed by the protruding fusible body and is inclined, resulting in poor straightness of the fuse, which directly affects the quality of the product. However, due to the use of a tube seat or the requirements of the use scene, the end cap and the pipe body need to meet certain straightness requirements and cannot be too inclined. In order to meet the above requirements, under the condition that other parts remain unchanged, the current general method is to cut and reduce the end portion of the fusible body or to reduce the pipe body. If the end portion of the fusible body is cut and reduced, the surface area combined with the solder will also be reduced, which can easily lead to unstable welding or virtual welding, affecting the normal use of the fuse. If the pipe body is reduced, although the straightness between the end cap and the pipe body can be improved, more solder is needed to fill and ensure reliable connection, which increases the cost, and after the pipe body is reduced, the internal space is also relatively small, which is not conducive to product breaking. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose at providing a kind of fusible body structure that can promote fusible body welding stability and fuse stability.

[0007] To achieve the above purpose, the solution of the utility model is:

[0008] A kind of fusible body structure, fusible body is erected between the diagonal of the both ends of fuse tube, and the both ends of fusible body are respectively welded and fixed with the both ends cap of fuse, and fusible body forms sheet, and it is respectively equipped with hook portion and at least one bending portion on the both ends of length direction;Hook portion is bent to the outer wall of fuse tube, and is hung and welded between the inner wall of end cap side and the outer wall of tube;Bending portion is bent to the inside of tube, and is combined with the solder tin on the bottom wall of end cap.

[0009] Further, the width of hook portion is less than the width of fusible body, and hook portion and at least one bending portion in the same end are arranged side by side in the width direction of fusible body.

[0010] Further, the bending direction of the bending portion of the both ends of fusible body is opposite, and is bent towards the direction of upper and lower surfaces of fusible body respectively.

[0011] Further, the number of bending portion of each end of fusible body is two, and hook portion is arranged between the two bending portions.

[0012] Further, the both ends of fusible body are divided into three pieces along the length direction at end, and the middle one is hook portion, and the two bending portions on both sides form bending portion.

[0013] Further, the total width of hook portion and bending portion is equal to the width of other parts of sheet-shaped fusible body.

[0014] Further, a plurality of narrow neck portions are further arranged on the middle section of fusible body.

[0015] After adopting the above scheme, compared with prior art, the utility model can have the following advantages:

[0016] 1, bending portion and hook portion are arranged simultaneously at the end of fusible body, so that the volume of fusible body used for hooking on the outer wall of tube can be reduced when the end of fusible body is erected and welded diagonally in fuse, the end cap will not be pushed and inclined by the hooking part of fusible body, and the collimation between end cap and tube can be improved;

[0017] 2, the bending portion bent inward is combined with the solder tin on the bottom wall of end cap, so that fusible body can be erected stably in fuse tube, and the contact area between fusible body and solder tin can be increased, and false welding can be avoided.

[0018] 3, since the solder tin has certain surface tension after melting, bending portion and hook portion can play a guiding role, guiding the solder tin to flow towards bending portion and hook portion, so as to facilitate welding and improve welding stability.

[0019] 4、In the fusible body end part is provided with the hook part and the hook part respectively, can reduce the impedance of the fusible body end part, avoid the fusible body in end part fuse, so the fusible body of the utility model has stability in the performance of fusing, can promote the overall performance and service life of the fuse using the fusible body. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is the structure schematic diagram of the utility model fusible body;

[0021] Fig. 2 It is the sectional view of the utility model fusible body welding in fuse;

[0022] Fig. 3 It is the sectional view of the utility model fusible body welding in fuse another view.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1 fusible body;11 hook part;12 bending part;13 narrow neck part;2 pipe body;3 solder;4 end cap. DETAILED DESCRIPTION

[0025] In order to further explain the technical scheme of the utility model, the utility model is described in detail below through specific embodiments.

[0026] Reference Figs. 1 to 3 The utility model discloses a kind of fusible body structures, which is inclinedly arranged in fuse pipe body 2, and the both ends of the fusible body 1 are respectively fixed with the two end caps 4 of fuse by soldering.The fusible body 1 is formed into sheet shape in the utility model, which can be a long strip metal sheet body, and the both ends of the fusible body 1 are respectively provided with a hook part 11 and at least one bending part 12 in length direction.The hook part 11 is used to bend towards the outer wall of fuse pipe body 2, and is hooked and welded between the inner wall of end cap 4 and the outer wall of pipe body 2;The bending part 12 bends towards the inner side of pipe body 2, and is combined with solder 3 on the bottom wall of end cap 4.

[0027] In the embodiment, the bending direction of the bending part 12 at both ends of the fusible body 1 is opposite, and bends towards the upper and lower surfaces of the fusible body 1 respectively, and the bending part 12 bends towards the middle of the both end faces of fuse pipe body when the fusible body 1 is inclinedly arranged in fuse pipe body 2.Due to the particularity that the fusible body 1 is diagonally arranged in pipe body 2, the reverse bending of the bending part 12 at both ends can increase the contact area between the bending part 12 and solder 3.

[0028] Further, the width of the hooking portion 11 is less than the width of the fusible body 1, so as to reduce the volume of the fusible body 1 for hooking on the outer wall of the tube body 2. The hooking portion 11 and the at least one bending portion 12 in the same end can be arranged side by side in the width direction of the fusible body. In the embodiment, the number of the bending portions 12 at each end of the fusible body 1 is two, and the hooking portion 11 is arranged between the two bending portions 12. Specifically, when the bending portions 12 and the hooking portion 11 are formed, the two ends of the fusible body 1 can be directly divided into three pieces along the length direction, the middle piece is the hooking portion 11, and the two pieces on the sides are the bending portions 12. When the two bending portions 12 are not bent, the hooking portion 11 and the two bending portions 12 can be spliced into the original appearance of the piece-shaped fusible body 1, that is, the total width of the hooking portion 11 and the two bending portions 12 is equal to the width of other parts of the piece-shaped fusible body 1. Therefore, the arrangement of the hooking portion 11 and the bending portion 12 at the end of the fusible body 1 does not affect the working performance of the fusible body 1, but the arrangement of the bending portion 12 can reduce the impedance at the end of the fusible body 1, avoid the fusible body 1 from being melted at the end, and improve the overall performance and service life of the fuse using the fusible body 1.

[0029] Preferably, a plurality of narrow neck portions 13 can be arranged on the middle section of the fusible body 1, so as to ensure that the fusible body 1 is melted at the narrow neck portions 13 first.

[0030] After the above structure is adopted, compared with the problem that the diagonal welding in the background art causes the collimation defect, when the end of the fusible body 1 is diagonally arranged and welded in the fuse, the whole end does not need to be bent to the outer wall of the tube body 2, the volume of the fusible body 1 for hooking on the outer wall of the tube body 2 is reduced, the end cap 4 is not pushed and tilted by the hooking portion of the fusible body 1, and the collimation between the end cap 4 and the tube body 2 is improved. In addition, the bending portion 12 bent inward is combined with the solder 3 on the bottom wall of the end cap 4, so that the fusible body 1 is stably arranged in the tube body 2 of the fuse, the contact area between the fusible body 1 and the solder 3 is increased, and false welding is avoided. Further, since the solder 3 has a certain surface tension after being melted, the bending portion 12 and the hooking portion 11 can guide the solder 3 to flow in the direction of the bending portion 12 and the hooking portion 11, so as to facilitate welding and improve the welding stability.

[0031] The above is only one embodiment of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A fusible structure, which is arranged diagonally between both ends of a fuse tube and is welded to both end caps of the fuse, characterized in that: the fusible structure is formed as a sheet, which has a hook portion and at least one bending portion at each end in the length direction; the hook portion is bent towards the outer wall of the fuse tube, and is hooked and welded between the inner wall of the end cap and the outer wall of the tube; and the bending portion is bent towards the inner side of the tube, and is combined with the solder on the bottom wall of the end cap. The width of the hook portion is less than the width of the fusible structure, and the hook portion and the at least one bending portion in the same end are arranged side by side in the width direction of the fusible structure. The bending directions of the bending portions at both ends of the fusible structure are opposite, and are bent towards the upper and lower surfaces of the fusible structure, respectively.

2. A meltable structure according to claim 1, wherein: The number of bending portions at each end of the fusible structure is two, and the hook portion is arranged between the two bending portions.

3. A meltable structure according to claim 1 or 2, wherein: The two ends of the fusible structure are divided into three pieces along the length direction at the end portions, the middle piece is the hook portion, and the two pieces on both sides are the bending portions.

4. A meltable structure according to claim 3, wherein: The total width of the hook portion and the bending portion is equal to the width of other parts of the sheet-shaped fusible structure.

5. A meltable structure according to claim 4, wherein: A plurality of narrow neck portions are further arranged on the middle section of the fusible structure.

6. A meltable structure according to claim 2, wherein: ​ 7. A meltable structure according to claim 1 or 2, wherein: ​

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