CN220367876U - Fuse element for fuse and fuse with same - Google Patents

Abstract

The utility model relates to a fuse element for a fuse and a fuse having the same. The melt comprises: a substrate made of a conductive material having a first melting point and configured into an elongated shape having a flat surface extending in a length direction; at least one row of narrow sections formed on the substrate at intervals from each other in a length direction of the substrate; an auxiliary layer made of a conductive material having a second melting point lower than the first melting point and attached to the lengthwise-extending flat surface of the substrate, the auxiliary layer being adjacent to and offset in the lengthwise direction of the substrate from a target narrow section of the at least one row of narrow sections closest to a central position in the lengthwise direction of the substrate. Therefore, the melt and the fuse of the utility model have wider application range and lower cost.

Description

Fuse element for fuse and fuse with same

Technical Field

The utility model relates to the technical field of circuit protection devices of electric power or electric automobiles, in particular to a fuse element for a fuse and the fuse with the same.

Background

The fuse is widely used as a current protector for high and low voltage distribution systems and control systems and electric equipment, such as semiconductor rectifying elements or rectifying devices, by virtue of its rapid breaking. The fuse may generally include an insulating housing, terminals mounted to both ends of the insulating housing, and a fuse body built in the insulating housing and connected to the corresponding terminals at both ends, respectively, such that the fuse body is connected in series to an external protected circuit via the terminals.

Therefore, when the current in the protected circuit exceeds a specified value, namely fault current occurs, the fault current passes through the melt through the connecting terminal, and the melt is fused due to accumulated thermal effect after a period of time, so that the protected circuit is broken to protect the protected circuit. However, the melt in the prior art is usually designed to separate the short-circuit current or to have the capability of separating the short-circuit fault current and the low-power overload current at the same time, which results in a very complex structure, which causes the defects of a narrow current protection range or high manufacturing cost.

There is therefore a need in the art for a lower cost melt and fuse that has a broader range of current protection.

Disclosure of Invention

The present utility model aims to provide a melt that at least solves some of the problems described above.

The present utility model is also directed to a fuse employing the improved melt as described above.

According to one aspect of the present utility model, there is provided a melt for a fuse, the melt comprising: a substrate made of a conductive material having a first melting point and configured into an elongated shape having a flat surface extending in a length direction; at least one row of narrow sections formed on the substrate at intervals from each other in a length direction of the substrate; an auxiliary layer made of a conductive material having a second melting point lower than the first melting point and attached to the lengthwise-extending flat surface of the substrate, the auxiliary layer being adjacent to a target narrow section of the at least one row of narrow sections closest to a central position in the lengthwise direction of the substrate and being arranged offset in the lengthwise direction of the substrate with respect to the target narrow section; wherein in a case where the at least one row of the stricture sections is configured as a plurality of rows of stricture sections, the auxiliary layer is configured to be spaced apart from the target stricture section by a first distance in a length direction of the substrate, and another stricture section of the plurality of rows of stricture sections located opposite the auxiliary layer with respect to the target stricture section in the length direction of the substrate is spaced apart from the target stricture section by a second distance, the first distance being less than half of the second distance; in the case where the at least one row of narrow sections is configured as a row of narrow sections, the auxiliary layer is configured to be spaced apart from the row of narrow sections by a first distance in a length direction of the substrate.

Compared with the prior art, the melt in the utility model can generate metallurgical effect with the substrate when fault current passes through the melt by arranging the auxiliary layer with the melting point lower than that of the substrate, so as to reduce the melting point of the target narrow section and accelerate fusing. The conforming arrangement of the auxiliary layer relative to the substrate may facilitate flow of the melted auxiliary layer over the substrate, particularly at higher temperatures of the target stenosis, which may avoid any possible recesses on the substrate surface from impeding flow. Furthermore, the offset arrangement of the auxiliary layer relative to the central position of the target narrow section in the longitudinal direction of the substrate may be particularly advantageous for the application of the melt at low overload currents, so as to allow the melt in the present utility model to not melt in the desired time when passing low overload fault currents.

Preferably, the auxiliary layer adjoins the target stricture section in a length direction of the substrate.

Preferably, the melt further comprises arc chute on the substrate spaced apart from the at least one row of narrow sections along the length of the substrate.

Preferably, in case the at least one row of narrow sections is configured as at least three rows of narrow sections, the melt further comprises at least one arc-extinguishing glue arranged on the substrate in the length direction of the substrate between two adjacent narrow sections between which the auxiliary layer is not arranged.

Preferably, the arc extinguishing glue is oppositely arranged in the thickness direction of the substrate.

Preferably, each narrow section includes two side holes extending from both ends in the width direction of the substrate toward the other end side, respectively, and a middle hole positioned centrally between the two side holes to form two narrow diameters in cooperation with the side holes on both sides.

Preferably, both ends of the auxiliary layer in the width direction of the substrate extend into both of the slits in the width direction of the substrate, respectively.

Preferably, the auxiliary layer is designed to have a circular, rectangular or long kidney shape projected in the thickness direction of the substrate.

According to another aspect of the present utility model, there is provided a fuse comprising the melt as described above.

Additional features and advantages of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following, or may be learned from practice of the utility model.

Drawings

Embodiments of the present utility model are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a perspective view of a melt according to the present utility model;

FIG. 2 is a top view of a melt according to the present utility model;

fig. 3 is a side view of a melt according to the present utility model.

Reference numerals: 100-melt; 10-a substrate; 20-a stricture section; 20 a-a target stricture segment; 20 b-another stricture section located on the opposite side of the auxiliary layer with respect to the target stricture section; 21-side holes; 22-middle hole; 23-narrow diameter; 30-an auxiliary layer; 40, arc extinguishing glue.

Detailed Description

Referring now to the drawings, illustrative versions of the disclosed melt are described in detail. Although the drawings are provided to present some embodiments of the utility model, the drawings are not necessarily to scale and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of part of components in the drawings can be adjusted according to actual requirements on the premise of not affecting the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification do not necessarily refer to all figures or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below" and other directional terms, will be understood to have their normal meaning and refer to those directions as they would be when viewing the drawings. Unless otherwise indicated, directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

The terms "joined," "connected," and the like as used herein, include both two components being indirectly joined together by means of an intermediate layer such as an adhesive, a solder, or the like, or an intermediate member such as a connecting member, a transition member, or the like, and also two components being directly joined together without any intermediate layer such as an adhesive, a solder, or the like, or an intermediate member such as a connecting member, a transition member, or the like.

Fig. 1 to 3 show, by way of example, a melt 100 according to the utility model, the melt 100 in this example not only being of a comparatively simple structural design, but also being able to be used for breaking short-circuit currents and also for breaking low-power overload currents, whereby the manufacturing costs of the melt 100 according to the utility model and the fuses to which it is applied are reduced and the application range is enlarged.

In particular, the fuse may include a melt 100, an insulating housing, and a pair of terminals. The insulating housing may be made of melamine or ceramic and other insulating materials known to those skilled in the art and may be generally configured in a cylindrical shape, with a pair of terminals respectively connected to, for example, the two axial ends of the insulating housing by welding to close the insulating housing so as to respectively connect, for example, the two axial ends of the melt 100 contained in the inner cavity of the insulating housing to adjacent terminals, thereby connecting the fuse and the melt 100 inside thereof in series to the protected circuit. It will be appreciated that the construction of the fuse other than melt 100 is not central to the discussion of the present utility model and therefore the construction other than melt 100, such as filling into an arc suppressing medium within an insulating housing, is well known to those skilled in the art and is not described in detail herein.

As shown in fig. 1-3, melt 100 may include a substrate 10, at least one row of narrow sections 20, and an auxiliary layer 30.

Wherein the substrate 10 may be punched from a conductive material such as copper material into an elongated shape such as a rectangle by a punching die, the elongated shape of the substrate 10 may have a flat surface extending along its length. For example, the length direction of the substrate 10 may be the left-right direction of the page in fig. 2 and 3, and the flat surface extending along the length direction of the substrate 10 may be the upper surface and/or the lower surface of the page in fig. 3.

At least one row of narrowed segments 20 may be formed by reducing the cross-section of substrate 10 so that when fault current is passed through melt 100, the temperature rise is first blown out as it is more resistive than the remainder of melt 100 and generates a greater amount of heat. The at least one row of narrow sections 20 may be uniformly spaced from each other and symmetrically arranged about a central position in the length direction of the substrate 10. Thus, for a single row of stricture segments 20, the target stricture segment 20a closest to the center position in the length direction of the substrate 10 in at least one row of stricture segments 20 is the stricture segment 20 in the middle. For the two rows of the narrow sections 20, the target narrow section 20a closest to the center position in the length direction of the substrate 10 in at least one row of the narrow sections 20 is either one of the two centered narrow sections 20. Illustratively, as shown in fig. 2, the stenosis sections 20 are configured in four rows, with the target stenosis section 20a being the left stenosis section 20 of the two centered stenosis sections 20.

The auxiliary layer 30 may be made of a conductive material having a lower melting point than the raw material of the substrate 10, i.e., the auxiliary layer 30 may be made of tin in case the substrate 10 is made of copper. The auxiliary layer 30 may be attached to the upper and/or lower surfaces of the substrate 10 in a state that the upper and/or lower surfaces of the substrate 10 are maintained flat. In a specific embodiment, the auxiliary layer 30 may be formed by dropping its raw material onto the flat surface of the substrate 10 after heating, wherein the flat surface of the substrate 10 is not damaged to form any recess in the thickness direction, thereby facilitating the flow of the melted auxiliary layer 30 on the substrate 10 in the case where the substrate 10 is not melted and the auxiliary layer 30 is melted.

Illustratively, as shown in fig. 3, the auxiliary layer 30 may be attached to the upper surface of the substrate 10 and disposed adjacent to the target narrow section 20a in the length direction of the substrate 10, whereby when the melt 100 in the present utility model passes a short-circuit fault current, the narrow section 20 is raised in temperature due to its relatively high resistance, the auxiliary layer 30 is first melted due to its relatively low melting point, and then the melted auxiliary layer 30 is guided to flow toward the target narrow section 20a on the upper surface of the substrate 10 due to the relatively high temperature of the adjacent target narrow section 20a, thereby forming an alloy portion having a melting point smaller than that of the material of the substrate 10 with the material of the target narrow section 20a by a metallurgical effect, thereby promoting the rapid fusing of the target narrow section 20a, for example, within several seconds.

Wherein metallurgical effects between the auxiliary layer 30 and the target stricture segment 20a may accelerate the fusing of the target stricture segment 20a, the conforming arrangement between the auxiliary layer 30 and the substrate 10 may facilitate the auxiliary layer 30 to flow toward the target stricture site to react with the target stricture site to promote acceleration. Although the offset arrangement of the auxiliary layer 30 with respect to the target narrow portion may take a certain amount of time to flow the auxiliary layer 30 to the target narrow portion, in the case where the short-circuit fault current is a large current, for example, 2 times the rated current, 3 times the rated current, or 5 times the rated current, the time taken does not affect the rapid fusing of the target narrow portion 20a.

In addition, when the melt 100 of the present utility model passes through a low-power overload current, compared to the case where the auxiliary layer 30 is not provided and cannot be melted and the auxiliary layer 30 is directly provided at the narrow section 20 to cause a rapid melting, the offset arrangement of the auxiliary layer 30 with respect to the target narrow section 20a may allow the auxiliary layer 30 to be melted at a slower speed before it takes a certain time to flow to the target narrow section 20a, so that the melt 100 of the present utility model is melted after a desired time for operation at a low-power overload current, for example, a rated current of 1.1 times allows for operation for 4 hours.

As illustrated in fig. 1 to 3, each narrow section 20 may include three punched holes formed in the width direction of the substrate 10, that is, two side holes 21 extending from both end sides to the other end side in the width direction of the substrate 10, respectively, and an intermediate hole 22 centrally located between the two side holes 21 in the width direction of the substrate 10, such that the intermediate hole 22 matches two narrow diameters 23 of the same shape and size as the side holes 21 on both sides, respectively. Wherein the side hole 21 and the middle hole 22 may be formed by punching the substrate 10 using the same size or the same die, and the centers of the side hole 21 and the middle hole 22 are positioned on the same straight line and have the same or substantially the same size along the length direction of the substrate 10. It can be seen from the figures that the side holes 21 and the middle holes 22 are designed in the shape of round holes or approximately semicircular holes, but in the embodiment not shown, the side holes 21 and the middle holes 22 can take other shapes, such as rectangular or long waist shape, etc., and the number of the side holes 21 and the middle holes 22 can be selected according to practical needs.

As shown, the projection pattern of the auxiliary layer 30 in the thickness direction of the substrate 10 may be circular, and the auxiliary layer 30 may be disposed substantially opposite to the middle hole 22 of the target narrow section 20a in the length direction of the substrate 10, for example, at a distance of several millimeters. Wherein the auxiliary layer 30 may be slightly larger in width than the intermediate hole 22 such that both widthwise ends thereof may extend into the two slits 23, respectively, to facilitate the flow of the melted auxiliary layer 30 to the target narrow section 20a. In an embodiment not shown, both ends of the auxiliary layer 30 in the width direction may extend all the way to both end sides of the substrate 10 in the width direction. In an embodiment not shown, the projection pattern of the auxiliary layer 30 in the thickness direction of the substrate 10 may be rectangular, long kidney-shaped, or other shapes well known to those skilled in the art, wherein preferably, the projection pattern of the auxiliary layer 30 in the thickness direction of the substrate 10 may be designed to be circular in the case where the width dimension of the substrate 10 is small, and the projection pattern of the auxiliary layer 30 in the thickness direction of the substrate 10 may be designed to be rectangular in the case where the width dimension of the substrate 10 is large. In an embodiment not shown, the auxiliary layer 30 may be shaped differently from the intermediate hole 22 of the target stricture segment 20a.

Alternatively, the auxiliary layer 30 may be disposed within a distance from the target narrow section 20a in the length direction of the substrate 10. In an embodiment not shown, the position of the auxiliary layer 30 closest to the target stenosis 20a may be a position where the auxiliary layer 30 meets the target stenosis 20a in the length direction of the substrate 10. In an embodiment not shown, the position of the auxiliary layer 30 furthest from the target stricture segment 20a may be designed in such a way that the auxiliary layer 30 extends from the target stricture segment 20a to the right (as shown in fig. 2) to a position closest to the central position of the target stricture segment 20a compared to the central position of another stricture segment 20b (as shown in fig. 2) located opposite to, i.e. to the right of, the auxiliary layer 30. In other words, if the distance between the target stricture segment 20a and the auxiliary layer 30 on the right side thereof (as shown in fig. 2) is defined as a first distance, and the distance between the target stricture segment 20a and the other stricture segment 20b on the right side thereof is defined as a second distance, the first distance is less than half of the second distance. Thus, for the auxiliary layer 30 between the target stenosis 20a and the other stenosis 20b to the right of the target stenosis 20a, the auxiliary layer 30 will always be closer to the target stenosis 20a in the length direction of the substrate 10.

Alternatively, as shown in fig. 1-3, the melt 100 may also include arc chute 40. Referring specifically to fig. 3, arc chute 40 may be oppositely disposed on the upper and lower surfaces of substrate 10 to vaporize upon reaching a preset temperature when a fault current passes through substrate 10 for assisting in arc chute when narrow section 20 of substrate 10 fuses. In an embodiment, not shown, the arc extinguishing glue 40 may be disposed only on the upper surface or the lower surface of the substrate 10.

As shown, the arc extinguishing glue 40 is configured in two and is arranged respectively between two adjacent narrow sections 20 without the auxiliary layer 30 therebetween in the length direction of the substrate 10, preferably centrally, for reliably assisting arc extinguishing when the substrate 10 is fused by a fault current. In an embodiment not shown, for example, in the case where the narrow sections 20 are configured in one or two rows, the arc extinguishing glue 40 may still be arranged at a spacing in the length direction of the substrate 10 with respect to the narrow sections 20, but in particular, the arc extinguishing glue 40 may be arranged on the other side opposite to the auxiliary layer 30 with respect to the target narrow sections 20a.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this utility model, and it is intended to be within the scope of the utility model.

Claims (9)

1. A melt (100) for a fuse, the melt (100) comprising:

a substrate (10) made of a conductive material having a first melting point and configured in an elongated shape having a flat surface extending in a length direction;

at least one row of narrow sections (20) formed on the substrate (10) at intervals from each other in the longitudinal direction of the substrate (10);

an auxiliary layer (30) made of a conductive material having a second melting point lower than the first melting point and attached to a flat surface of the substrate (10) extending in a length direction, the auxiliary layer (30) being adjacent to a target narrow section (20 a) of the at least one row of narrow sections (20) closest to a central position in the length direction of the substrate (10) and being arranged offset in the length direction of the substrate (10) with respect to the target narrow section (20 a);

wherein in the case where the at least one row of stricture sections (20) is configured as a plurality of rows of stricture sections (20), the auxiliary layer (30) is configured to be spaced apart from the target stricture section (20 a) by a first distance in the length direction of the substrate (10), and another stricture section (20 b) of the plurality of rows of stricture sections (20) located opposite to the auxiliary layer (30) with respect to the target stricture section (20 a) in the length direction of the substrate (10) is spaced apart from the target stricture section (20 a) by a second distance, the first distance being less than half of the second distance;

in case the at least one row of narrow sections (20) is configured as a row of narrow sections (20), the auxiliary layer (30) is configured to be at a first distance from the row of narrow sections (20) in the length direction of the substrate (10).

2. The melt (100) for a fuse of claim 1, wherein said auxiliary layer (30) abuts said target narrow section (20 a) in a length direction of said substrate (10).

3. The melt (100) for a fuse of claim 1, wherein said melt (100) further comprises arc chute (40) on said substrate (10) spaced along the length of said substrate (10) relative to said at least one row of narrow sections (20).

4. The melt (100) for a fuse of claim 1, wherein, in case the at least one row of narrow sections (20) is configured as at least three rows of narrow sections (20), the melt (100) further comprises at least one arc extinguishing glue (40) arranged on the substrate (10) in a length direction of the substrate (10) between two adjacent narrow sections (20) without the auxiliary layer (30) in between.

5. Melt (100) for a fuse of claim 3 or 4, characterized in that the arc extinguishing glue (40) is arranged opposite in the thickness direction of the substrate (10).

6. Melt (100) for a fuse according to claim 1, characterized in that each narrow section (20) comprises two side holes (21) extending from both ends in the width direction of the substrate (10) to the other end side, respectively, and a middle hole (22) positioned centrally between the two side holes (21) to form two narrow diameters (23) in cooperation with the side holes (21) on both sides.

7. Melt (100) for a fuse of claim 6, wherein both ends of the auxiliary layer (30) in the width direction of the substrate (10) extend into both of the narrow paths (23) in the width direction of the substrate (10), respectively.

8. Melt (100) for fuses according to claim 1, wherein the auxiliary layer (30) is designed such that a projected pattern in the thickness direction of the substrate (10) is circular, rectangular or long kidney-shaped.

9. A fuse, characterized in that it comprises a melt (100) according to any one of claims 1 to 8.