CN221041017U - 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 conductive substrate and at least one row of varying cross-sectional portions; wherein, all the narrow diameters of the variable cross-section parts of each row are configured into at least one narrow diameter group comprising two first narrow diameters and a second narrow diameter positioned between the two first narrow diameters, the minimum cross-section area of the first narrow diameters along the length direction of the conductive substrate is equal to the second narrow diameters, and the total cross-section area is smaller than the second narrow diameters; wherein both side edges of the first diameter in the width direction of the conductive base are configured as a straight edge and an arc edge, respectively, both side edges of the second diameter in the width direction of the conductive base are configured as arc edges symmetrical with respect to each other, and a dimension of the straight edge of the first diameter in the length direction of the conductive base is larger than a dimension of the arc edge of the first diameter in the length direction of the conductive base, and a shape and a dimension of the arc edge of the second diameter are configured to be identical with those of the arc edge of the first diameter.

Description

Fuse element for fuse and fuse with same

Technical Field

The utility model relates to the technical field of electronic components, in particular to a fuse element for a fuse and the fuse with the same.

Background

Fuses, such as fast fuses, as current protectors are widely used for various power distribution systems and control system consumers, in particular for semiconductor rectifying elements or rectifying devices, by virtue of their fast breaking. The fast fuse can be connected in series with the protected circuit, and when the protected circuit fails, the fault current passes through the melt of the fast fuse to heat and fuse the melt, so that the purpose of protecting the circuit is realized. However, with the rapid development of new energy technologies, particularly the popularity of electric vehicles with compact installation space and poor heat dissipation conditions, the melt of the conventional fast fuse at present is difficult to meet the requirement of shorter fusing time, thereby causing the defect of narrow applicability.

Accordingly, there is a need in the art for a melt that is relatively versatile and a fuse having the melt.

Disclosure of utility model

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 conductive base configured in a rectangular sheet shape; at least one row of variable cross-section portions arranged at intervals along the length direction of the conductive base body, each row of variable cross-section portions including a plurality of through holes arranged at intervals along the width direction of the conductive base body and a narrow diameter between adjacent through holes among the plurality of through holes; wherein all the narrow diameters of each row of the variable cross-section parts are configured into at least one narrow diameter group comprising two first narrow diameters and a second narrow diameter positioned between the two first narrow diameters, the minimum cross-sectional area of the first narrow diameters along the length direction of the conductive matrix is equal to the minimum cross-sectional area of the second narrow diameters along the length direction of the conductive matrix, and the total cross-sectional area of the first narrow diameters along the length direction of the conductive matrix is smaller than the total cross-sectional area of the second narrow diameters along the length direction of the conductive matrix; wherein both side edges of the first diameter in the width direction of the conductive base are configured as a straight edge and an arc edge, respectively, both side edges of the second diameter in the width direction of the conductive base are configured as arc edges symmetrical with each other, and a dimension of the straight edge of the first diameter in the length direction of the conductive base is not smaller than a dimension of the arc edge of the first diameter in the length direction of the conductive base, and a shape and a dimension of the arc edge of the second diameter are configured to be identical with those of the arc edge of the first diameter; the dimension of the straight edge of the first narrow diameter in the length direction of the conductive substrate is larger than the dimension of the arc-shaped edge of the first narrow diameter in the length direction of the conductive substrate.

Compared with the prior art, the melt is provided with the first narrow diameter and the second narrow diameter, wherein the minimum sectional area of the first narrow diameter is equal to the total sectional area of the second narrow diameter, the total sectional area of the first narrow diameter is different from the total sectional area of the first narrow diameter, the first narrow diameter is larger than the total sectional area of the first narrow diameter, the first narrow diameter can be used for accelerating the fusing of the variable section part, and the material around the first narrow diameter is reduced by prolonging the dimension of the straight edge of the first narrow diameter, which is smaller than the total sectional area, along the length direction of the conductive substrate, so that the heat dissipation rate of the material is reduced, the temperature rise is improved, and the material has lower minimum breaking capacity when the material faces the same through-flow time and current conditions.

Preferably, all of the narrow diameters of the varied cross-section portions of each row are configured to include at least two sets of narrow diameter groups arranged at intervals in the width direction of the conductive base, and a spacing between adjacent narrow diameter groups of the at least two sets of narrow diameter groups is larger than a spacing between a first narrow diameter and an adjacent second narrow diameter of each narrow diameter group.

Preferably, the plurality of through holes are composed of a first punched hole having a straight edge along a length direction of the conductive base and a second punched hole having an arc-shaped edge along the length direction of the conductive base.

Preferably, the first punched hole is configured to include two side holes extending toward each other from both sides in a width direction of the conductive base body and a first intermediate hole located between the two side holes.

Preferably, the second punched hole is configured as at least one second intermediate hole arranged between each of the side holes and the first intermediate hole.

Preferably, the side hole is configured as a semi-quadrangular hole and the first intermediate hole is configured as a quadrangular hole, and the second intermediate hole is configured as a circular hole or an oblong hole.

Preferably, the melt further comprises tin bridges arranged on the conductive substrate in a width direction of the conductive substrate.

According to still another aspect of the present utility model, there is also provided a fuse including a fusion pipe, a melt mounted into the fusion pipe, and an arc extinguishing filler filled into the fusion pipe to cover the melt, wherein the melt is the aforementioned melt.

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 the 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 cross-sectional view of a fuse according to the present utility model;

Fig. 2 is a schematic view of a melt of a fuse according to the present utility model.

Reference numerals illustrate: a 100-fuse; 10-melt; 11-a conductive substrate; 12-a variable cross-section portion; 13-narrow diameter group; 131-a first throat; 132-a second throat; 14-first punching; 14 a-side aperture; 14 b-a first intermediate hole; 15-second punching; 15 a-a second intermediate hole; 16-tin bridge; 20-melting tube; 21-a cylindrical body; 22-end cap.

Detailed Description

Referring now to the drawings, exemplary aspects of the disclosed fuses and melts thereof 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 2 show, by way of example, a melt 10 of the present utility model and a fuse 100 having the melt 10, the melt 10 in this example having a shorter fusing time than the melt 10 of a conventional fuse 100, so that it is applicable to an application scenario where the installation space is compact and the heat dissipation condition is poor, such as an electric automobile interior power distribution system, which can expand the applicability of the melt 10 provided by the present utility model.

In the illustrated embodiment, the fuse 100 may include a fusion pipe 20, a melt 10, and an arc suppressing filler, not shown.

Wherein the fusion pipe 20 may be configured to include a cylindrical body 21 extending in a lateral direction and end caps 22 respectively connected to both lateral ends of the cylindrical body 21. Referring to fig. 1 and 2, the transverse direction is the left-right direction of the page where the drawing is located, and the longitudinal direction perpendicular to the transverse direction is the up-down direction of the page where the drawing is located. A piece of melt 10 is shown mounted inside the tube 20 and has its lateral ends connected to end caps 22 on either lateral side of the tube 20, the end caps 22 in turn being connected in series to the circuit to be protected, so that the melt 10 can be connected in series to the circuit to be protected by means of the end caps 22. In an embodiment not shown, a plurality of melts 10 arranged in parallel and spaced apart relation to one another may be provided within the melting tube 20.

After the end cap 22 is mounted to the cylindrical body 21, an arc extinguishing filler such as quartz sand or the like may be filled into the cylindrical body 21 via the filling holes in the end cap 22, whereby the arc extinguishing filler may cover the entire melt 10 in the cylindrical body 21. In this way, when each sheet of melt 10 begins to fuse due to the heat of a fault current passing therethrough and fails to fuse completely due to the generation of an arc at the fusing point, the arc extinguishing filler surrounding each sheet of melt 10 can be used to extinguish the generated arc, thereby helping to break the melt 10 and the protected circuit.

In the illustrated embodiment, melt 10 may include a conductive matrix 11 and at least one row of varying cross-section portions 12.

In particular, the conductive substrate 11 may have a rectangular sheet-like structure made of a conductive material such as copper, which is effective in reducing costs and satisfying severe environmental compounding and current impact application conditions as compared to the prior art fast fuse 100 made of silver. Processing the conductive base 11 by means of an external processing tool may form at least one row of variable cross-section portions 12 arranged at intervals in the longitudinal direction of the conductive base 11, that is, the foregoing lateral direction, on the conductive base 11. For example, as shown in the drawings, the conductive base 11 is provided with three rows of variable cross-section portions 12 which are uniformly spaced apart in the lateral direction. It can be seen that the shape and size of each row of variable cross-section portions 12 are designed identically, so that the current-carrying cross-sectional areas of each row of variable cross-section portions 12 are equal to ensure that the arcing time and the arcing time of each row of variable cross-section portions 12 at the time of breaking remain identical.

The variable cross-section portion 12 may include a plurality of through holes opened in the width direction of the conductive base 11, that is, the aforementioned longitudinal direction, at intervals, and a narrow diameter between adjacent through holes. More specifically, all of the diameters on the variable-section portion 12 may be configured as at least one group of the diameters 13, and the group of the diameters 13 may include two first diameters 131 and a second diameter 132 located between the two first diameters 131. The smallest cross-sectional area of the first slit 131 along the length direction of the conductive substrate 11, that is, the smallest cross-sectional area of the first slit 131 is equal to the smallest cross-sectional area of the second slit 132, for ensuring that the arcing time of the first slit 131 and the second slit 132 at the time of breaking is consistent. Meanwhile, the total cross-sectional area of the first slit 131 along the length direction of the conductive base 11, that is, the total cross-sectional area is smaller than the total cross-sectional area of the second slit 132. That is, the current-carrying sectional area of the first narrow diameter 131 of each row of variable cross-section portions 12 is smaller than that of the second narrow diameter 132, so that the second narrow diameter 132 fuses earlier than the first narrow diameter 131 when a fault current passes through the melt 10, thereby shortening the overall fusing time of each row of variable cross-section portions 12 and the melt 10.

Alternatively, the variable cross-section portion 12 may include at least two sets of the slit groups 13 arranged at intervals in the longitudinal direction, each of the rows of the variable cross-section portion 12 as shown in the drawing may include two sets of the slit groups 13, and each of the sets of the slit groups 13 may be provided with the first slit 131, the second slit 132, and the first slit 131 in order in the longitudinal direction. Thus, the distance between adjacent slit groups 13 is the distance between the first slits 131 adjacent to each other. Such an arrangement can increase the heat dissipation distance between adjacent slit groups 13 in consideration of the fact that the current-carrying cross-sectional area of the first slit 131 is smaller than that of the second slit 132, thereby improving the heat dissipation effect of the melt 10 in the present embodiment. The breaking effect of the fuse 100 provided by the present utility model can be further improved by combining the arc extinguishing filler filled into the melting tube 20 and coating the melt 10 on this basis.

In an embodiment not shown, the number of the second slits 132 included in the slit group 13 may be designed to be plural according to actual electrical requirements, and the plural second slits 132 may be arranged at even intervals between the two first slits 131. Still further, the spacing between adjacent sets of slots 13 may be designed to be greater than the spacing between a first slot 131 and an adjacent second slot 132 in each set of slots 13, such as in the embodiment shown.

It will be appreciated that in the case where the conductive substrate 11 is configured as a sheet-like structure of uniform thickness, the cross-sectional area at the throat may correspond to the spacing between its two longitudinal edges. In the embodiment shown in the figures, the longitudinal both side edges of the first slit 131 are configured as straight edges and arc edges, respectively, the longitudinal both sides of the second slit 132 are configured as arc edges symmetrical with respect to each other, and the lateral dimension of the straight edges of the first slit 131 is not smaller than the lateral dimension of the arc edges thereof, the arc edges of the first slit 131 being identical to the arc edges of the second slit 132.

In this way, in the case where the minimum longitudinal distance between the straight edge of the first throat 131 and the arcuate edge is equal to the minimum longitudinal distance of the two arcuate edges of the second throat 132, the further arcuate edge disposed farther from the arcuate edge than the straight edge would make the total cross-sectional area of the first throat 131 correspondingly smaller than the total cross-sectional area of the second throat 132, with a simple and smart structural design.

In the illustrated embodiment, the lateral dimension of the straight edge of the first throat 131 may be configured to be greater than, for example, a multiple of the lateral dimension of the arcuate edge of the first throat 131, and correspondingly a multiple of the lateral dimension of the arcuate edge of the second throat 132, which may increase the gap between the total cross-sectional area of the first throat 131 and the total cross-sectional area of the second throat 132 to further improve the breaking effect of the melt 10 in the present utility model.

Alternatively, in the illustrated embodiment, the variable cross-section portion 12 of the conductive substrate 11 may be formed using an outer first punch and an outer second punch having a shape and size different from the outer first punch to process the conductive substrate 11 to obtain first and second diameters 131, 132 of the variable cross-section portion 12 different from each other. It can be seen that the melt 10 provided by the present utility model is provided by means of only two different punch tools.

Specifically, the outer first punch and the outer second punch for cutting the conductive base 11 of the melt 10 may be configured as a quadrangular prism structure and a cylindrical structure, respectively, so that a first punched hole 14 having a straight edge in the transverse direction and a second punched hole 15 having an arc-shaped edge in the transverse direction are formed on the varied cross-section portion 12, respectively. Wherein the first punched hole 14 may include two side holes 14a extending from both longitudinal sides of the conductive base 11 toward the other side and a first intermediate hole 14b located in the middle of the two side holes 14a, and the second punched hole 15 may be configured as at least one second intermediate hole 15a disposed between each side hole 14a and the first intermediate hole 14 b.

The side hole 14a is formed by partially cutting the conductive base 11 by the outer first punch, and thus the side hole 14a may be generally configured as a partially quadrangular hole, preferably a half quadrangular hole. The first intermediate hole 14b is formed by entirely cutting the conductive base 11 by an outer first punch, and thus the first intermediate hole 14b may be generally configured as a quadrangular hole. The second intermediate hole 15a is formed by entirely cutting the conductive base 11 by an outer second punch, and thus the second intermediate hole 15a may be generally configured as a circular hole. In an embodiment not shown, the second intermediate hole 15a may also be configured as an oblong hole extending in the longitudinal direction.

In the case where the second intermediate hole 15a is configured as a circular hole as shown in the drawing, the longitudinal dimension of the first intermediate hole 14b may be approximately twice the diameter of the second intermediate hole 15a, and in correspondence therewith, two second intermediate holes 15a may be provided between each side hole 14a and the first intermediate hole 14 b.

Optionally, the melt 10 may further comprise tin bridges 16 arranged longitudinally on the conductive substrate 11, for example tin bridges 16 soldered to the conductive substrate 11. In the illustrated embodiment, a plurality of tin bridges 16 may be laterally spaced apart on the conductive substrate 11 and respectively intermediate each adjacent two rows of variable cross-section portions 12 to create a metallurgical effect to accelerate the fusing of the conductive substrate 11 and thereby provide protection to the circuit.

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 (8)

1. A melt (10) for a fuse (100), the melt (10) comprising:

a conductive base (11) configured in a rectangular sheet shape;

At least one row of variable cross-section portions (12) arranged at intervals along the length direction of the conductive base body (11), each row of variable cross-section portions (12) including a plurality of through holes opened at intervals along the width direction of the conductive base body (11) and a narrow diameter between adjacent through holes among the plurality of through holes;

Wherein all of the narrow diameters of each row of the variable cross-section portions (12) are configured as at least one narrow diameter group (13) including two first narrow diameters (131) and a second narrow diameter (132) located between the two first narrow diameters (131), a minimum cross-sectional area of the first narrow diameters (131) along a length direction of the conductive base (11) is equal to a minimum cross-sectional area of the second narrow diameters (132) along the length direction of the conductive base (11), and a total cross-sectional area of the first narrow diameters (131) along the length direction of the conductive base (11) is smaller than a total cross-sectional area of the second narrow diameters (132) along the length direction of the conductive base (11);

The both side edges of the first slit (131) in the width direction of the conductive base (11) are respectively configured as a straight edge and an arc edge, the both side edges of the second slit (132) in the width direction of the conductive base (11) are configured as arc edges symmetrical with each other, and the dimension of the straight edge of the first slit (131) in the length direction of the conductive base (11) is not smaller than the dimension of the arc edge of the first slit (131) in the length direction of the conductive base (11), and the shape and the dimension of the arc edge of the second slit (132) are configured to be identical with those of the arc edge of the first slit (131);

The straight edge of the first narrow diameter (131) has a larger dimension in the length direction of the conductive substrate (11) than the arc edge of the first narrow diameter (131) has in the length direction of the conductive substrate (11).

2. The melt (10) for the fuse (100) of claim 1, wherein all of the narrow diameter portions (12) of each row are configured to include at least two sets of narrow diameter groups (13) arranged at intervals in a width direction of the conductive base (11), and a spacing between adjacent narrow diameter groups (13) of the at least two sets of narrow diameter groups (13) is larger than a spacing between a first narrow diameter (131) and an adjacent second narrow diameter (132) of each narrow diameter group (13).

3. Melt (10) for a fuse (100) of claim 2, wherein the plurality of through holes consists of a first punched hole (14) having a straight edge along the length of the conductive base (11) and a second punched hole (15) having an arcuate edge along the length of the conductive base (11).

4. A melt (10) for a fuse (100) as set forth in claim 3, characterized in that the first punched hole (14) is configured to include two side holes (14 a) extending toward each other from both sides in a width direction of the conductive base body (11) and a first intermediate hole (14 b) located between the two side holes (14 a).

5. The melt (10) for a fuse (100) of claim 4, wherein said second punched hole (15) is configured as at least one second intermediate hole (15 a) disposed between each of said side holes (14 a) and said first intermediate hole (14 b).

6. Melt (10) for a fuse (100) according to claim 5, characterized in that the side hole (14 a) is configured as a semi-quadrangular hole and the first intermediate hole (14 b) is configured as a quadrangular hole, and the second intermediate hole (15 a) is configured as a circular hole or oblong hole.

7. Melt (10) for a fuse (100) according to any one of claims 1 to 6, characterized in that the melt (10) further comprises tin bridges (16) arranged on the conductive substrate (11) in the width direction of the conductive substrate (11).

8. A fuse (100), characterized in that the fuse (100) comprises a fusion tube (20), a melt (10) mounted into the fusion tube (20), and an arc extinguishing filler filled into the fusion tube (20) to encase the melt (10), wherein the melt (10) is the melt (10) according to any one of claims 1 to 7.