Fuse body for fuse and fuse

Abstract

To provide a fuse that simultaneously provides overload and short circuit protection capabilities.SOLUTION: A fuse body has a longitudinal direction along the length direction and a lateral direction along the width direction, and the fuse body includes a first group of through holes arranged on the body along the lateral direction and a first group of narrow paths formed on the body along the direction of the first group of through holes, and a first fixing portion in which the cross-sectional area of each narrow path of the first group of narrow paths is constant along the longitudinal direction, and a second fixing portion that is arranged at a distance from the first fixing portion along the longitudinal direction, and includes a second group of through holes arranged on the body along the lateral direction and a second group of narrow paths formed on the body along the direction of the second group of through holes, and in which the cross-sectional area of each narrow path of the second group of narrow paths tapers in a direction toward the center of the narrow path along the longitudinal direction, and the lateral spacing between two adjacent narrow paths of the first group of narrow paths is smaller than the lateral spacing between two adjacent narrow paths of the second group of narrow paths.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to the technical field of short circuit and overload protection for electrical circuits, and more particularly to fuse bodies for fuses and fuses. [Background technology]

[0002] A fuse is a circuit protection device that cuts off the circuit by melting the fuse body by its own heat within a certain time when the current exceeds a specified value. Currently, fuses are widely used in the field of electric vehicles. In the early stage of the development of electric vehicles, the requirements for the power distribution system are large opening capacity, small size, and fast melting. For this reason, AR high-speed fuses are generally selected for the protection of the power distribution system. As the electric vehicle industry gradually becomes standardized, higher requirements are being presented for the fuses used to protect the power distribution system to meet the protection needs of various loads under various operating conditions. For example, in addition to the characteristics of the original AR type fuse, there is now a demand for fuses with an overload capacity of 1.1In (1.1 times the rated current) and overload and short circuit protection capabilities of 2In, 3In, and 5In at the same time. Summary of the Invention [Problem to be solved by the invention]

[0003] The present disclosure aims to provide a fuse body for a fuse that solves at least some of the above technical problems.

[0004] The present disclosure also contemplates providing a fuse incorporating the improved fuse body described above. [Means for solving the problem]

[0005] According to an aspect of the present disclosure, there is provided a fuse body for a fuse having a longitudinal direction along a length direction and a lateral direction along a width direction, the fuse body comprising: The main body, a first fixing portion including a first through hole group arranged in the main body along the lateral direction and a first narrow path group formed in the main body along the direction of the first through hole group, the cross-sectional area of ​​each narrow path of the first narrow path group being constant in the longitudinal direction; a second fixing portion disposed at a distance from the first fixing portion in the longitudinal direction, the second fixing portion including a second through hole group disposed in the main body along the lateral direction and a second narrow path group formed in the main body along the direction of the second through hole group, the cross-sectional area of ​​each narrow path of the second narrow path group tapering in the longitudinal direction in a direction toward the center of the narrow path; The lateral spacing between two adjacent passages of the first group of passages is smaller than the lateral spacing between two adjacent passages of the second group of passages.

[0006] According to the fuse body provided herein, the first narrow group of the first anchoring portion and the second narrow group of the second anchoring portion form a differentiated design in the shape of the individual narrow paths and the lateral spacing between the narrow paths, in the first narrow group, each narrow path is configured as a rectangle of substantially constant cross section with a small lateral spacing between adjacent narrow paths, and in the second narrow group, each narrow path is configured as a waist shape with a smaller cross section toward the center and a larger lateral spacing between adjacent narrow paths. This differentiated design makes the first narrow group more likely to collect heat than the second narrow group, resulting in a difference in thermal conductivity and heat dissipation coefficient between the two narrow group, which can meet the requirements of 1.1 In overload resistance, 2 In, 3 In, and 5 In overload and short circuit protection. Due to the differentiated design of the narrow paths, the fuse body can be manufactured from low-cost conductor materials such as copper. In this case, the product still exhibits high interruption capability and wide range of overcurrent protection capability, as well as harsh environmental loads and current inrush application conditions.

[0007] In some embodiments, the cross-sectional areas of each of the first series of narrow passages are identical to each other.

[0008] In some embodiments, the smallest cross-sectional area of ​​each of the second group of narrow passages is the same as each other.

[0009] In some embodiments, the cross-sectional area of ​​any narrow passage in the first group of narrow passages is equal to the smallest cross-sectional area of ​​any narrow passage in the second group of narrow passages.

[0010] In some embodiments, the first group of through holes includes a plurality of first through holes arranged in the body along a lateral direction, and the first group of narrow passages includes a narrow passage formed between two adjacent first through holes.

[0011] In some embodiments, the first group of through holes further includes a plurality of second through holes arranged opposite the plurality of first through holes along a lateral direction, the plurality of second through holes having a lateral dimension greater than a lateral dimension of the plurality of first through holes, and the first group of narrow passages further includes a narrow passage formed between adjacent first and second through holes.

[0012] In some embodiments, at least a portion of a side edge of a first through hole adjacent to another first through hole or adjacent to a second through hole is configured as a straight edge, and at least a portion of a side edge of a second through hole adjacent to a first through hole is configured as a straight edge.

[0013] In some embodiments, the second group of through holes includes a plurality of third through holes arranged in the body along a lateral direction, the third through holes having a lateral dimension greater than a lateral dimension of the first through holes, and the second group of narrow passages includes a narrow passage formed between two adjacent third through holes.

[0014] In some embodiments, a side edge of a third through hole adjacent to another third through hole is configured as a rounded edge that protrudes toward the other third through hole.

[0015] According to another aspect of the present disclosure, there is provided a fuse, the fuse comprising: Housing and Two terminals located at both ends of the housing; a fuse body connected between two terminals within the housing, the fuse body being the fuse body described above; and an arc-extinguishing medium filled within the housing.

[0016] Other features and advantages of the present disclosure will be in part apparent to those skilled in the art upon reading this application, and in part are described in the following specific embodiments in conjunction with the accompanying drawings. [Brief description of the drawings]

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, in which: [Figure 1] FIG. 1 is a cross-sectional view of a fuse according to one embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic diagram of a fuse according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Next, schematic embodiments of the fuse and fuse body for the fuse disclosed in the present disclosure will be described in detail with reference to the accompanying drawings. The accompanying drawings are provided to present some embodiments of the present disclosure, but the accompanying drawings do not need to be drawn to the dimensions of a particular embodiment, and certain features may be enlarged, removed, or locally divided in order to better illustrate and explain the present disclosure. In addition, some of the components in the accompanying drawings may be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar phrases appearing in this specification do not necessarily refer to all the accompanying drawings or examples.

[0019] Certain directional terms, such as "inner," "outer," "upper," "lower," and the like, used hereinafter to describe the accompanying drawings, are understood to have their ordinary meaning and to refer to the orientations associated with the ordinary viewing of the accompanying drawings. Unless otherwise indicated, the directional terms described herein substantially conform to conventional orientations as understood by those skilled in the art.

[0020] The terms "first," "primary," "second," "secondary," and the like, used in this disclosure do not denote order, number, or importance, but are used to distinguish one component from another.

[0021] FIG. 1 illustrates a fuse according to an embodiment of the present disclosure. As illustrated, the fuse 1 includes a housing 2, a terminal 4, and a fuse body 5. The housing 2 may be cylindrical or any other suitable shape and defines an internal receiving cavity extending along a longitudinal direction L. In one embodiment, the housing 2 is a one-piece member made by a one-piece molding process. In another embodiment, the housing 2 is made of two half shells assembled together, and the two half shells can be combined together by welding. Two terminals 4 are disposed at two opposite ends of the receiving cavity. A liner 3, for example for sealing, may be sandwiched between the outer peripheral surface of the terminal 4 and the inner peripheral surface of the housing 2. The liner 3 may extend along the entire longitudinal length of the housing 2. The fuse body 5 is connected between the two terminals 4 in the receiving cavity of the housing 2, and the receiving cavity of the housing 2 is filled with an arc-quenching medium, for example, quartz sand, which encapsulates the fuse body 5. The fuse body 5 and the two terminals 4 are each manufactured in a one-piece molding process and connected by welding or other suitable electrical connections. Alternatively, the fuse body 5 and the two terminals may be part of a one-piece molded monolithic piece. The fuse body 5 may be made of any suitable conductive material, such as copper, zinc, silver, etc., with copper being preferred. As an example where the fuse body 5 is made of a copper material, the fuse body 5 will be described in detail below.

[0022] 2 shows a plan view of a fuse body according to an embodiment of the present disclosure. As shown in the figure, the fuse body 5 is in the form of a sheet having a longitudinal direction L along the length direction, a lateral direction W along the width direction, and a thickness direction (not shown) perpendicular to the length direction and the width direction. The main body 6 of the fuse body 5 is made of a copper material, and a first fixing portion 7 and a second fixing portion 8 of different designs are formed thereon.

[0023] The first fixing portion 7 is disposed, for example, at a substantially intermediate position of the main body 6 along the longitudinal direction L, and the main body 6 is formed with a first group of through holes disposed along the transverse direction W. As shown in FIG. 2, the first group of through holes includes two first through holes 71 disposed on the main body 6 along the transverse direction W, and two second through holes 72 disposed on the opposite sides of the two first through holes 71 along the transverse direction W. The first through holes 71 and the second through holes 72 each penetrate the entire main body 6 in the thickness direction. The dimension of the first through hole 71 along the transverse direction W is smaller than the dimension of the second through hole 72 along the transverse direction W. In the illustrated embodiment, each of the two second through holes 72 extends to the corresponding side edge of the main body 6. Narrow paths 73 are formed between two adjacent first through holes 71 and between adjacent first through holes 71 and second through holes 72, and these narrow paths 73 are disposed along the direction of the first group of through holes to form a first group of narrow paths. For the sake of distinction, in this specification, these narrow passages 73 forming the first narrow passage group are also referred to as first narrow passages 73.

[0024] The first narrow passage 73 is substantially rectangular, and the cross-sectional area S1 thereof 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 a chamfered rectangle, but it will be understood that the effect of the chamfered portion on the cross-sectional area of ​​the first narrow passage 73 is negligible for the intended purpose of the present disclosure. In an embodiment not illustrated, the first through hole and the second through hole may be a rectangle having straight sides. In another embodiment not illustrated, the side edge of the first through hole adjacent to another first through hole and the side edge adjacent to the second through hole are straight edges, and the side edge of the second through hole adjacent to the first through hole are straight edges, so that it is also possible to form a rectangular first narrow passage having a substantially constant cross section between two adjacent first through holes and between adjacent first through holes and second through holes. In this case, the other two side edges of the first through hole and the other two side edges of the second through hole are not limited to straight edges, and may be other shapes such as curved edges.

[0025] In the first narrow path group, the cross-sectional area S1 of all the first narrow paths 73 is the same. In this way, the first narrow paths 73 included in the first narrow path group ensure consistent arc initiation time and arc ignition time under high current conditions (e.g., interruption current of 5 In to 20 KA). As used herein, "arc initiation time" refers to the time period from when the current exceeds the rated value of the fuse to when an arc occurs inside the fuse when an overload or short circuit occurs in the circuit. The shorter this time, the faster the fuse can cut off the power supply, and the safer the electrical equipment and the human body can be. "Arc ignition time" refers to the time from when an arc occurs to when it disappears.

[0026] The second fixing portion 8 is disposed on the main body 6 at a distance from the first fixing portion 7 along the longitudinal direction L, and a second through-hole group disposed along the lateral direction W is formed in the main body 6. As shown in the figure, the second through-hole group includes four third through-holes 81 disposed on the main body 6 along the lateral direction W. Each of the third through-holes 81 penetrates the entire main body 6 in the thickness direction. The third through-holes 81 have a dimension along the lateral direction W that is larger than the dimension of the first through-holes 71 along the lateral direction W. In the illustrated embodiment, each of the two third through-holes 81 located on the outermost sides in the lateral direction extends to the corresponding side edge of the main body 6. Narrow passages 83 are formed between two adjacent third through-openings 81, and these narrow passages 83 are disposed along the direction of the second through-hole group to form a second narrow passage group. For the sake of distinction, these narrow passages 83 forming the second narrow passage group 83 are also referred to as second narrow passages 83 in this specification.

[0027] The second narrow passage 83 has a waist shape in which the width narrows from the middle, and in the longitudinal direction L, the cross-sectional area of ​​the second narrow passage 83 tapers in the direction from both ends toward the center, and the minimum cross-sectional area S2 is formed at the longitudinal center of the second narrow passage 83. In the illustrated embodiment, the side edge of the third through hole 81 adjacent to another third through hole 81 is a curved edge protruding toward the other third through hole 81, thereby forming a waist-shaped second narrow passage 83 between the two adjacent third through holes 81, and the remaining two edges of the third through hole 81 are straight edges. In an embodiment not shown, in addition to the side edge of the third through hole adjacent to another third through hole being a curved edge protruding toward the other third through hole, the remaining two edges of the third through hole can also be curved edges, and thereby, for example, the third through hole can be configured in a shape such as a circle or an ellipse.

[0028] In the second narrow path group, the minimum cross-sectional area S2 of all the second narrow paths 83 is the same. In this way, the second narrow paths 83 included in the second narrow path group can ensure consistency between the arc start time and the arc ignition time under a large current condition (for example, an interruption current of 5 In to 20 KA).

[0029] Since the dimension of the first through hole 71 along the lateral direction W is smaller than the dimension of the third through hole 81 along the lateral direction W, the lateral interval between two adjacent first narrow paths 73 in the first narrow path group is smaller than the lateral interval between two adjacent second narrow paths 83 in the second narrow path group. This allows the first narrow path group to be designed to be differentiated from the second narrow path group in terms of the shape of each narrow path and the lateral interval between the two narrow paths. This differentiated design makes it easier for the first narrow path group to collect heat than the second narrow path group, resulting in a difference in thermal conductivity and heat dissipation coefficient between the first narrow path group and the second narrow path group. This differentiated design also makes it easier to meet the fixing characteristics up to 2In. Under the same overcurrent conditions, the first narrow path group is destroyed earlier than the second narrow path group. Based on different overcurrents, the difference in rupture time between the first and second narrow path groups will be different, for example, less than 100 ms for 20KA.

[0030] The size relationship between S1 and S2 can be designed according to the desired product characteristics while ensuring that all first narrow passages 73 included in the first narrow passage group have the same area S1 in cross section and all second narrow passages 83 included in the second narrow passage group have the same area S2 in the smallest cross section. In one embodiment, S1=S2.

[0031] As shown in Figures 1 and 2, the two second fixtures 8 are disposed on opposite sides of the first fixture 7 along the longitudinal direction L. However, it will be understood that the number of first fixtures 7 and second fixtures 8 can be designed according to the desired product features, for example, not only one first fixture 7 but also one second fixture 8 can be disposed on the main body 6.

[0032] Furthermore, although the first fixing portion 7 is shown to include two first through holes 71 and two second through holes 72, and the second fixing portion 8 is shown to include 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 can be adjusted as long as the cross sections of the first narrow passages of the first narrow passage group are configured to be substantially balanced, the cross sections of the second narrow passages of the second narrow passage group are configured to taper in a direction toward the center, and the lateral spacing between two adjacent first narrow passages is made smaller than the lateral spacing between two adjacent second narrow passages in order to meet the requirements of the differentiated design between the first narrow passage group and the second narrow passage group.

[0033] For example, in an embodiment not shown, the first through hole group of the first fixing portion is composed of a plurality of first through holes having the same lateral dimension (i.e., the second through hole is omitted), and a first narrow passage having a substantially constant rectangular cross section is formed between two adjacent first through holes, and the second fixing portion is composed of a plurality of third through holes having the same lateral dimension, and a second narrow passage having a waist shape whose cross section tapers in a direction toward the center is formed between two adjacent third through holes. The lateral dimension of the third through hole is larger than the lateral dimension of the first through hole, so that the lateral distance between two adjacent first narrow passages in the first narrow passage group is smaller than the lateral distance between two adjacent second narrow passages in the second narrow passage group. In this way, in the sense of the present invention, the first narrow passage group is differentiated from the second narrow passage group in terms of the shape of the individual narrow passages and the lateral distance between the narrow passages.

[0034] Although this specification is described based on various embodiments, each embodiment does not include only one independent technical solution, and this description in this specification is merely for the purpose of clarity, and those skilled in the art should take this specification as a whole and should understand that the technical solutions in the various embodiments can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0035] The above are merely schematic and specific embodiments of the present disclosure, and are not intended to limit the scope of the present disclosure. Equivalent changes, modifications and combinations made by those skilled in the art without departing from the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure. [Explanation of symbols]

[0036] 1: fuse, 2: housing, 3: liner, 4: terminal, 5: fuse body, 6: body, 7: first fixing portion, 71: first through hole, 72: second through hole, 73: first narrow passage, 8: second fixing portion, 81: third through hole, 83: second narrow passage, L: longitudinal direction, W: lateral direction

Claims

1. A fuse body for a fuse having a longitudinal direction (L) along a length direction and a lateral direction (W) along a width direction, the fuse body comprising: A main body (6); a first fixing portion (7) including a first group of through holes arranged in the main body (6) along the lateral direction (W) and a first group of narrow paths formed in the main body (6) along the direction of the first group of through holes, the cross-sectional area of ​​each narrow path of the first group of narrow paths being constant in the longitudinal direction (L); a second fixing portion (8) disposed at a distance from the first fixing portion (7) in the longitudinal direction (L), the second fixing portion (8) including a second group of through holes disposed in the main body (6) along the lateral direction (W) and a second group of narrow paths formed in the main body (6) along the direction of the second group of through holes, the cross-sectional area of ​​each narrow path of the second group of narrow paths being tapered in the longitudinal direction (L) toward the center of the narrow path; A fuse body for a fuse, wherein a lateral distance between two adjacent narrow paths of the first group of narrow paths is smaller than a lateral distance between two adjacent narrow paths of the second group of narrow paths.

2. 2. The fuse body for a fuse according to claim 1, wherein the cross-sectional areas of the respective narrow paths of said first group of narrow paths are the same as each other.

3. 2. The fuse body for a fuse according to claim 1, wherein the narrow paths of the second group of narrow paths have the same minimum cross-sectional area.

4. 2. The fuse body for a fuse according to claim 1, wherein a cross-sectional area of ​​any one of the narrow paths in the first group is equal to a minimum cross-sectional area of ​​any one of the narrow paths in the second group.

5. A fuse body for a fuse as described in any one of claims 1 to 4, characterized in that the first through hole group includes a plurality of first through holes (71) arranged in the body (6) along the horizontal direction (W), and the first narrow path group includes a narrow path formed between two adjacent first through holes (71).

6. The fuse body for a fuse as described in claim 5, characterized in that the first group of through holes further includes a plurality of second through holes (72) arranged on the opposite side of the plurality of first through holes (71) along the horizontal direction (W), the plurality of second through holes (72) having a horizontal dimension larger than the horizontal dimension of the plurality of first through holes (71), and the first group of narrow paths further includes a narrow path formed between adjacent first through holes (71) and second through holes (72).

7. 7. The fuse body for a fuse as described in claim 6, characterized in that at least a portion of a side edge of the first through hole (71) adjacent to another first through hole (71) or adjacent to a second through hole (72) is configured as a straight edge, and at least a portion of a side edge of the second through hole (72) adjacent to the first through hole (71) is configured as a straight edge.

8. The fuse body for a fuse as described in claim 5, characterized in that the second group of through holes includes a plurality of third through holes (81) arranged in the body (6) along the horizontal direction (W), the third through holes (81) having a horizontal dimension larger than a horizontal dimension of the first through holes (71), and the second group of narrow paths includes a narrow path formed between two adjacent third through holes (81).

9. 9. The fuse body for a fuse as described in claim 8, characterized in that a side edge of the third through hole (81) adjacent to another third through hole (81) is configured as a curved edge protruding toward the other third through hole (81).

10. A housing (2); Two terminals (4) arranged at both ends of the housing (2); a fuse body (5) connected between the two terminals (4) in the housing (2), the fuse body (5) being a fuse body as claimed in any one of claims 1 to 9; and an arc-extinguishing medium filled in the housing (2).

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