CN220272412U - Fuse element for a fuse and fuse - Google Patents

Abstract

The utility model relates to a fuse body for a fuse and a fuse. The melt has a longitudinal direction along the length direction and a transverse direction along the width direction, and includes: a main body; a first fusing part including a first group of through holes arranged in a lateral direction of the main body and a first group of slits formed in the main body in an orientation of the first group of through holes, wherein an area of a cross section of each of the first group of slits is constant in a longitudinal direction; a second fusing part arranged at a distance from the first fusing part in a longitudinal direction, the second fusing part including a second group of through holes arranged in a lateral direction of the main body and a second group of slits formed in the main body in an orientation of the second group of through holes, wherein an area of a cross section of each of the second group of slits is tapered in a direction approaching a center of the slit in the longitudinal direction; wherein the lateral spacing between adjacent two of the first set of slots is less than the lateral spacing between adjacent two of the second set of slots.

Description

Fuse element for a fuse and fuse

Technical Field

The utility model relates to the technical field of circuit short-circuit and overload protection, in particular to a fuse element for a fuse and the fuse.

Background

A fuse (fuse) is a circuit protection device that fuses a melt by heat generated by itself in a certain time range when a current exceeds a prescribed value, thereby breaking a circuit. Currently, fuses are widely used in the field of electric automobiles. In the early stage of development of electric automobiles, the requirements on a power distribution system are as follows: large breaking capacity, miniaturization and quick fusing. For this reason, AR fast fuses are generally selected for distribution system protection. With the gradual standardization of the electric automobile industry, more and higher requirements are put forward on the fuse for protecting the power distribution system so as to meet the protection requirements of different loads under various working conditions. For example, there is a need to provide a fuse having both 1.1In (1.1 times rated current) overload tolerance, 2In, 3In and 5In overload and short-circuit protection capabilities, in addition to the characteristics of the original AR type fuse.

Disclosure of Invention

The present utility model aims to provide a melt for a fuse which solves at least some of the above-mentioned technical problems.

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 having a longitudinal direction along a length direction and a transverse direction along a width direction, the melt comprising: a main body; a first fusing part including a first group of through holes arranged in the main body in the lateral direction and a first group of slits formed in the main body in an orientation of the first group of through holes, wherein an area of a cross section of each of the first group of slits is constant in the longitudinal direction; a second fusing part disposed at a distance from the first fusing part in the longitudinal direction, the second fusing part including a second group of through holes disposed in the main body in the lateral direction and a second group of slits formed in the main body in an orientation of the second group of through holes, wherein an area of a cross section of each of the second group of slits is tapered in a direction near a center of the slit in the longitudinal direction; wherein the lateral spacing between adjacent two of the first set of slots is less than the lateral spacing between adjacent two of the second set of slots.

According to the melt provided by the scheme, the first group of narrow diameters of the first fusing part and the second group of narrow diameters of the second fusing part form differential designs in the shape of a single narrow diameter and the transverse interval between the narrow diameters, wherein each narrow diameter in the first group of narrow diameters is configured as a rectangle with a basically constant cross section, the transverse interval between the adjacent narrow diameters is smaller, and each narrow diameter in the second group of narrow diameters is configured as a waist with a smaller cross section when the narrow diameters are closer to the middle, and the transverse interval between the adjacent narrow diameters is larger. Through the differential design, the first group of narrow diameters are easier to collect heat than the second group of narrow diameters, so that the two groups of narrow diameters form differences In heat conductivity and heat dissipation coefficient, and the overload tolerance of 1.1In and the overload and short-circuit protection requirements of 2In, 3In and 5In are met. Through the differential narrow diameter design, the melt can be made of low-cost conductor materials (such as copper), and at the moment, the product still has higher breaking capacity and wide-range overcurrent protection capacity, and simultaneously meets the severe environmental load and current impact application conditions.

In some embodiments, the cross-sectional area of each of the first set of slots is uniform.

In some embodiments, the area of the smallest cross-section of each of the second set of slots is uniform.

In some embodiments, the cross-sectional area of any one of the first set of slots is equal to the smallest cross-sectional area of any one of the second set of slots.

In some embodiments, the first set of through-holes comprises a plurality of first through-holes arranged in the lateral direction to the body, wherein the first set of slots comprises slots formed between two adjacent first through-holes.

In some embodiments, the first set of through holes further comprises a plurality of second through holes arranged on opposite sides of the plurality of first through holes in the lateral direction, wherein a lateral dimension of the plurality of second through holes is greater than a lateral dimension of the plurality of first through holes, and wherein the first set of narrow diameters further comprises narrow diameters formed between adjacent first and second through holes.

In some embodiments, at least a portion of the side edge of the first through hole adjacent to the other first through hole or adjacent to the second through hole is configured as a straight edge, and at least a portion of the side edge of the second through hole adjacent to the first through hole is configured as a straight edge.

In some embodiments, the second set of through holes includes a plurality of third through holes arranged in the lateral direction at the body, the third through holes having a lateral dimension greater than a lateral dimension of the first through holes, wherein the second set of slots includes slots formed between adjacent two third through holes.

In some embodiments, a side edge of the third through hole adjacent to the other third through hole is configured as a circular arc edge protruding toward the other third through hole.

According to another aspect of the present utility model, there is provided a fuse comprising: a housing; two terminals respectively arranged at opposite ends of the housing; a melt connected within the housing between the two terminals, wherein the melt is the melt described above; and the arc extinguishing medium is filled in the shell.

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

FIG. 2 is a schematic view of a melt according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a fuse; 2. a housing; 3. a liner layer; 4. a terminal; 5. a melt; 6. a main body; 7.

a first fusing part; 71. a first through hole; 72. a second through hole; 73. a first throat;

8. a second fusing part; 81. a third through hole; 83. a second narrow diameter; l, longitudinal direction; w is,

Transverse direction

Detailed Description

Referring now to the drawings, the melt for a fuse and the schematic solution of the fuse disclosed in the present utility model will be 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.

Fig. 1 shows a fuse according to an embodiment of the present utility model. As shown, the fuse 1 includes a housing 2, terminals 4, and a melt 5. The housing 2 may be cylindrical or any other suitable shape and defines internally a cavity that is through in the longitudinal direction L. In one embodiment, the housing 2 is a unitary piece made by an integral molding process. In another embodiment, the housing 2 is composed of two half-shells spliced together, wherein the two half-shells can be combined together by means of welding or the like. The two terminals 4 are respectively positioned at two opposite ends of the cavity. A lining 3, for example, for sealing, may be interposed between the outer periphery of the terminal 4 and the inner periphery of the housing 2. The liner 3 may extend along the entire longitudinal L length of the housing 2. The melt 5 is connected between the two terminals 4 in the cavity of the housing 2, and the cavity of the housing 2 is filled with an extinguishing medium, such as quartz sand, which surrounds the melt 5. The melt 5 and the two terminals 4 may each be formed by an integral molding process and connected together by welding or other suitable electrical connection. Alternatively, the melt 5 and the two terminals may be an integrally formed unitary piece. The melt 5 may be of a suitable conductor material, such as copper, zinc, silver, etc., with copper being preferred. The melt 5 will be described in detail below with the melt 5 being made of a copper material as an example.

Fig. 2 shows a plan view of a melt according to an embodiment of the utility model. As shown in the drawing, the melt 5 is sheet-like, has a longitudinal direction L in the length direction and a lateral direction W in the width direction, and has a thickness direction (not shown in the drawing) perpendicular to the length direction and the width direction. The body 6 of the melt 5 is made of a copper material, on which a first 7 and a second 8 fuse part of differential design are formed.

The first fusing part 7 is located, for example, at a substantially middle position in the longitudinal direction L of the main body 6, and a first group of through holes aligned in the lateral direction W is formed in the main body 6. As shown in fig. 2, the first group of through holes includes two first through holes 71 arrayed in the lateral direction W on the main body 6 and two second through holes 72 located on opposite sides of the two first through holes 71 in the lateral direction W. The first through hole 71 and the second through hole 72 each penetrate the entire body 6 in the thickness direction. The dimension of the first through hole 71 in the lateral direction W is smaller than the dimension of the second through hole 72 in the lateral direction W. In the illustrated embodiment, two second through holes 72 each extend to a respective side edge of the main body 6. The first group of slits 73 are formed between two adjacent first through holes 71 and second through holes 72, and these slits 73 are aligned in the orientation of the first group of through holes and constitute the first group of slits. For the sake of distinction, these slots 73 that make up the first set of slots are also referred to herein as first slots 73.

The first throat 73 is substantially rectangular overall, and its cross-sectional area S1 is substantially constant in the longitudinal direction L. In the illustrated embodiment, the first through-hole 71 and the second through-hole 72 are each rounded rectangular, but it is understood that the effect of the rounded portions on the area of the first slit 73 in cross-section is negligible for the intended purposes of the present utility model. In one embodiment, not shown, the first through hole and the second through hole may be rectangular with right-angle sides. In another embodiment, not shown, the side edge of the first through hole adjacent to the other first through hole and the side edge of the second through hole adjacent to the first through hole are straight edges, respectively, and the side edge of the second through hole adjacent to the first through hole is a straight edge, whereby a rectangular first narrow diameter with a substantially constant cross section can also be formed between the adjacent two first through holes and between the adjacent first through hole and the second through hole, and at this time, the other two side edges of the first through hole and the other two side edges of the second through hole may not be straight edges, but may have other shapes, such as an arc edge.

In the first set of slots, the area S1 of the cross-section of all the first slots 73 is uniform. In this way, the first diameter 73 included In the first group of diameters can ensure uniformity of the striking time and the striking time under a large current (for example, an off current of 5In to 20 KA). In this context, "arcing time" refers to the time from when the current exceeds a nominal value to when an arc is generated inside the fuse when an overload or short circuit occurs in the circuit. The shorter this time, the more quickly the fuse can cut off the power supply, thereby protecting the electrical equipment and personal safety. "arcing time" refers to the duration from the onset of arcing to when it is extinguished.

The second fusing part 8 is disposed on the main body 6 at a distance from the first fusing part 7 in the longitudinal direction L, and a second group of through holes aligned in the lateral direction W are formed on the main body 6. As shown, the second group of through holes includes four third through holes 81 arranged in the lateral direction W on the main body 6. These third through holes 81 each penetrate the entire main body 6 in the thickness direction. The third through-hole 81 has a dimension in the lateral direction W larger than that of the first through-hole 71. In the illustrated embodiment, the two third through holes 81 located at the laterally outermost sides each extend to a corresponding side edge of the main body 6. Between the adjacent two third through holes 81, narrow paths 83 are formed, and these narrow paths 83 are aligned in the orientation of the second group of through holes and constitute the second group of narrow paths. For the sake of distinction, these slots 83 that make up the second set of slots are also referred to herein as second slots 83.

The second slit 83 is formed in a waist shape narrowed in the middle as a whole, and the cross-sectional area thereof is tapered in the longitudinal direction L in the direction from both ends toward the center, and a minimum cross-sectional area S2 is formed at the longitudinal center position of the second slit 83. In the illustrated embodiment, the side edge of the third through hole 81 adjacent to the other third through hole 81 is an arc-shaped side protruding toward the other adjacent third through hole 81, whereby a kidney-shaped second slit 83 is formed between the two adjacent third through holes 81, while the remaining two sides of the third through hole 81 are straight sides. In an embodiment not shown, in addition to the side edge of the third through hole adjacent to the other third through hole being an arc-shaped edge protruding toward the other adjacent third through hole, the remaining two edges of the third through hole may also be arc-shaped edges, whereby, for example, the third through hole may be configured in a circular, oval, or the like shape.

In the second set of slots, the area S2 of the smallest cross-section of all second slots 83 is uniform. In this way, the second slit 83 included In the second group of slits can ensure consistency of the striking time and the striking time under a high current (for example, an off current of 5In to 20 KA).

Since the dimension in the lateral direction W of the first through hole 71 is smaller than the dimension in the lateral direction W of the third through hole 81, the lateral spacing between adjacent two first throats 73 in the first group of throats is smaller than the lateral spacing between adjacent two second throats 83 in the second group of throats. Whereby the first set of slots forms a differential design from the second set of slots in terms of the shape of the individual slots and the lateral spacing between the slots. This differential design results in the first set of slots being more thermally conductive than the second set of slots, thereby creating a gap in thermal conductivity and heat dissipation coefficient between the first and second sets of slots. This differentiated design is also advantageous In satisfying the fusing characteristics of 2In or less. Under the same overcurrent condition, the first set of slots will blow earlier than the second set of slots. The time difference between the first and second sets of slots fusing may also be different based on different over-currents, e.g., time difference < 100ms at 20 KA.

In the case where the area S1 of the cross-section of all the first throats 73 included in the first group of throats is ensured to be uniform, and the area S2 of the smallest cross-section of all the second throats 83 included in the second group of throats is ensured to be uniform, the size relationship between S1 and S2 may be designed according to the desired product characteristics. In one embodiment, s1=s2.

As shown in fig. 1 and 2, two second fusing parts 8 are arranged on opposite sides of the first fusing part 7 in the longitudinal direction L. It will be appreciated that the number of first and second fuse portions 7, 8 may be designed according to the desired product characteristics, for example, only one first fuse portion 7 and one second fuse portion 8 may be disposed on the body 6.

Further, although the first fusing part 7 is shown to include two first through holes 71 and two second through holes 72, and the second fusing part 8 includes four third through holes 81, it is understood that the number and size of the first through holes 71, the second through holes 72, and the third through holes 81 may be adjusted as long as the cross sections of the first narrow diameters of the first group of constructed narrow diameters are substantially equalized, while the cross sections of the second narrow diameters of the second group of narrow diameters taper in a direction close to the center, and the lateral spacing between the adjacent two first narrow diameters is smaller than the lateral spacing between the adjacent two second narrow diameters, so as to satisfy the differential design requirements of the first group of narrow diameters and the second group of narrow diameters.

For example, in one embodiment, not shown, the first group of through-holes of the first fusing part is constituted by a plurality of first through-holes of the same lateral dimension (i.e., the second through-holes are omitted), and a rectangular first narrow diameter of substantially constant cross section is formed between two adjacent first through-holes, while the second fusing part is constituted by a plurality of third through-holes of the same lateral dimension, and a kidney-shaped second narrow diameter of which cross section tapers in a direction approaching the center is formed between two adjacent third through-holes. The third through hole has a lateral dimension greater than the lateral dimension of the first through hole, whereby a lateral spacing between two adjacent first ones of the first set of slots is less than a lateral spacing between two adjacent second ones of the second set of slots. Whereby the first set of slots forms a differential design as in the sense of the present application with the second set of slots in the shape of the individual slots and the lateral spacing between the slots.

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 (10)

1. A melt for a fuse having a longitudinal direction (L) along a length direction and a transverse direction (W) along a width direction, the melt comprising:

a main body (6);

a first fusing part (7) including a first group of through holes arranged in the main body (6) in the transverse direction (W) and a first group of narrow diameters formed in the main body (6) in an orientation of the first group of through holes, wherein an area of a cross section of each narrow diameter in the first group of narrow diameters is constant in the longitudinal direction (L);

a second fusing part (8) arranged at a distance from the first fusing part (7) in the longitudinal direction (L), the second fusing part (8) including a second group of through holes arranged in the main body (6) in the transverse direction (W) and a second group of narrow diameters formed in the main body (6) in an orientation of the second group of through holes, wherein an area of a cross section of each narrow diameter in the second group of narrow diameters tapers in a direction near a center of the narrow diameter in the longitudinal direction (L);

wherein the lateral spacing between adjacent two of the first set of slots is less than the lateral spacing between adjacent two of the second set of slots.

2. The melt for a fuse of claim 1, wherein the cross-sectional area of each of the first set of slots is uniform.

3. The melt for a fuse of claim 1, wherein the smallest cross-sectional area of each of the second set of slots is uniform.

4. The melt for a fuse of claim 1, wherein the cross-sectional area of any one of the first set of slots is equal to the smallest cross-sectional area of any one of the second set of slots.

5. Melt for a fuse element according to any of claims 1 to 4, characterized in that the first set of through holes comprises a plurality of first through holes (71) arranged in the transverse direction (W) to the main body (6), wherein the first set of narrow diameters comprises narrow diameters formed between two adjacent first through holes (71).

6. The melt for a fuse of claim 5, wherein the first set of through holes further comprises a plurality of second through holes (72) arranged on opposite sides of the plurality of first through holes (71) in the transverse direction (W), wherein a transverse dimension of the plurality of second through holes (72) is greater than a transverse dimension of the plurality of first through holes (71), and wherein the first set of narrow diameters further comprises narrow diameters formed between adjacent first through holes (71) and second through holes (72).

7. Melt for a fuse according to claim 6, characterized in that at least a part of the side of the first through-hole (71) adjacent to the other first through-hole (71) or adjacent to the second through-hole (72) is configured as a straight edge and at least a part of the side of the second through-hole (72) adjacent to the first through-hole (71) is configured as a straight edge.

8. Melt for a fuse according to claim 5, characterized in that the second set of through holes comprises a plurality of third through holes (81) arranged in the transverse direction (W) in the main body (6), the third through holes (81) having a transverse dimension which is larger than the transverse dimension of the first through holes (71), wherein the second set of narrow diameters comprises narrow diameters formed between adjacent two third through holes (81).

9. Melt for a fuse according to claim 8, characterized in that the side of the third through-hole (81) adjacent to the other third through-hole (81) is configured as a circular arc side protruding towards the other third through-hole (81).

10. A fuse, characterized by comprising:

a housing (2);

two terminals (4) respectively arranged at opposite ends of the housing (2);

a melt (5) connected between the two terminals (4) within the housing (2), wherein the melt (5) is a melt according to any one of claims 1 to 9;

and the arc extinguishing medium is filled in the shell (2).