Fuse melt and fuse

Abstract

The utility model discloses a fuse melt and a fuse, the fuse melt comprises a conductive substrate, and the central area of the conductive substrate is provided with a plurality of columns of first-class through holes; the conductive substrate is also provided with two columns of second-type through holes, and the two columns of second-type through holes are respectively arranged at two sides of the central area; and the length of the second type of through holes is greater than that of the first type of through holes. According to the utility model, the first type of through holes are arranged at the two sides of the second type of through holes, and the length of the first type of through holes is greater than that of the second type of through holes, so that under the condition that the length of the melt is not changed, stronger breaking capacity under a large-current breaking condition is obtained.

Description

Technical Field

[0001] The utility model relates to the field of fuses, in particular to a fuse element and a fuse. Background Art

[0002] A fuse is an electrical device that generates heat to melt the fuse when the current exceeds the specified value, thereby disconnecting the circuit. A fuse is a current protector that uses the heat generated by itself to melt the fuse after the current exceeds the specified value for a period of time, thereby disconnecting the circuit. Fuses are widely used in high and low voltage power distribution systems, control systems, and various electrical equipment. As a short circuit and overcurrent protector, they are one of the most common protection devices.

[0003] The fuse is an important part of the fuse. It must be able to break the circuit absolutely safely when encountering a short-circuit current. In other words, no unsafe factors should occur during the breaking process, such as continuous arcing, multiple conduction, breakage, splashing, burning or even explosion. Therefore, each fuse must have a certain breaking capacity value, and the maximum short-circuit current of the protected circuit cannot exceed its breaking capacity when used.

[0004] In order to adapt to the development trend of fuses with increased rated voltage and breaking capacity, the most important influencing factor lies in the design of the fuse, which is usually solved by increasing the number of columns of fuse through holes and increasing the length of the fuse, which often increases the volume of the fuse. In modern circuit design, there are often restrictions on the size requirements of components. Therefore, the commonly used solutions of increasing the rated voltage and breaking capacity are likely to conflict with customer needs. Utility Model Content

[0005] In view of the above problems existing in the prior art, a fuse element and a fuse are now provided.

[0006] The specific technical solution is as follows: a fuse fuse, suitable for a fuse;

[0007] Wherein, the fuse element comprises a conductive substrate, and a central region of the conductive substrate is provided with a plurality of rows of first-type through holes;

[0008] The conductive substrate is also provided with two rows of second-type through holes, and the two rows of the second-type through holes are respectively provided on both sides of the central area;

[0009] The length of the second type of through hole is greater than the length of the first type of through hole.

[0010] Preferably, the length of the second type of through holes is 4 mm.

[0011] Preferably, in each column of the second-type through holes, a first distance between two adjacent second-type through holes is not greater than a second distance between two adjacent first-type through holes in each column of the first-type through holes.

[0012] Preferably, the first distance between two adjacent second-type through holes is 0.25 mm.

[0013] Preferably, the second type of through holes are in the shape of a racetrack, a rhombus, or a rectangle.

[0014] Preferably, the distance between each column of the second-type through holes and an adjacent column of the first-type through holes is 7 mm.

[0015] Preferably, the number of the first type of through holes in each column of the first type of through holes is equal to the number of the second type of through holes in each column of the second type of through holes.

[0016] Preferably, the fuse element is made of copper, silver or a copper-silver composite material.

[0017] A fuse, comprising the fuse element described in any one of the above items.

[0018] The above technical solution has the following advantages or beneficial effects:

[0019] In the utility model, the first type of through holes are arranged on both sides of the second type of through holes, and the length of the first type of through holes is greater than that of the second type of through holes. Therefore, when the fuse length remains unchanged, a stronger breaking capacity is obtained under the condition of large current breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are however only used for illustration and description and are not intended to limit the scope of the present invention.

[0021] Figure 1 This is an overall schematic diagram of a fuse element in one of the preferred embodiments of the present utility model;

[0022] Figure 2 This is an overall schematic diagram of a fuse element in another preferred embodiment of the utility model;

[0023] Figure 3 This is an overall schematic diagram of a fuse element in another preferred embodiment of the utility model;

[0024] Figure 4 Another preferred embodiment of the utility model is a schematic diagram of a fuse element. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0028] In a preferred embodiment of the utility model, a fuse fuse is provided, which is suitable for a fuse;

[0029] Among them, Figure 1-Figure 4 As shown, the fuse element includes a conductive substrate, and a plurality of rows of first-type through holes 1 are arranged in the central area of ​​the conductive substrate;

[0030] Two rows of second-type through holes 2 are also provided on the conductive substrate, and the two rows of second-type through holes 2 are respectively provided on both sides of the central area;

[0031] The length of the second type through hole 2 is greater than that of the first type through hole 1 .

[0032] Specifically, in the prior art, in order to adapt to the development trend of fuses to increase rated voltage and breaking capacity, the problem is usually solved by increasing the number of columns of fuse through holes and increasing the length of the fuse.

[0033] However, this tends to increase the size of the fuse. In modern circuit design, there are often restrictions on the size of components, so the commonly used solution of increasing the rated voltage and breaking capacity is used, but this solution is likely to conflict with customer needs.

[0034] In the above embodiment, two types of through holes are provided on the conductive substrate, wherein the second type of through holes 2 are provided on both sides of the first type of through holes 1;

[0035] The first type of through hole 1 is arranged in the central area of ​​the conductive substrate;

[0036] In order to neither increase the length of the fuse nor increase the rated voltage to increase the breaking capacity of the fuse, in the above embodiment, the length of the second type of through hole 2 is set to be greater than the length of the first type of through hole 1;

[0037] When the fuse is flowing, the current passes through the conductive material of the narrow neck between each through hole. When a very large fault current passes through, the narrow neck of the second through hole 2 of the utility model will be melted before the narrow neck of the first through hole 1. Therefore, the energy passing through the circuit is less than the fuse of the prior art in which the length of the second through hole 2 is equal to that of the first through hole 1.

[0038] In other words, when being able to withstand the same amount of energy, the fault current passed by the utility model is stronger, that is, in the utility model, the breaking capacity of the fuse is enhanced by setting the length of the second through hole to be greater than the length of the first through hole.

[0039] Furthermore, in the above embodiment, the number of the first type through holes 1 and the second type through holes 2 is determined by the rated current of the fuse.

[0040] Further, in the present invention, the narrow neck is equivalent to the distance in the following text, and the distance will be replaced by the narrow neck in the following text.

[0041] In a preferred embodiment of the present invention, the length of the second type of through hole 2 is 4 mm.

[0042] Specifically, in the above embodiment, when the length of the second type through hole 2 is set to 4 mm, the effect of the fuse is best, but the length of the second type through hole 2 can be changed according to actual conditions, but it is necessary to ensure that the length of the first type through hole 1 is less than the length of the second type through hole 2.

[0043] Further, in the above embodiment, when the length of the second type through hole 2 is set to 4 mm, the length of the first type through hole 1 is 2 mm.

[0044] Furthermore, the length of the second type through hole 2 in the melt is 1.3-3 times the length of the first type through hole 1 in the melt.

[0045] In a preferred embodiment of the present invention, in each column of second-type through holes 2 , a first distance between two adjacent second-type through holes 2 is not greater than a second distance between two adjacent first-type through holes 1 in each column of first-type through holes 1 .

[0046] Furthermore, in a preferred embodiment of the present invention, the first distance between two adjacent second-type through holes 2 is 0.25 mm.

[0047] Specifically, in the above embodiment, the shortest narrow neck between two adjacent second-type through holes 2 is the shortest distance between two adjacent second-type through holes 2, which is 0.25 mm;

[0048] In the above embodiment, since the first distance between two adjacent second-type through holes 2 is not greater than the second distance between two adjacent first-type through holes 1 in each column of first-type through holes 1 , the second distance is greater than or equal to 0.25 mm.

[0049] In the present invention, the shortest narrow neck between two adjacent first-type through holes 1 is 0.25 mm, that is, the second distance is 0.25 mm.

[0050] In a preferred embodiment of the present invention, Figure 1-Figure 4 As shown, the second type of through holes 2 are in the shape of a racetrack, a rhombus, or a rectangle.

[0051] Specifically, Figure 1 As shown, in one embodiment of the present utility model, when the second type through hole 2 is set to a racetrack shape, the first type through hole 1 is set to a circular shape, and the diameter of the first type through hole 1 is 2 mm;

[0052] The second type of through holes 2 is a racetrack shape consisting of two semicircles with a diameter of 2 mm and a square with a length of 2 mm.

[0053] like Figure 2 As shown, in one embodiment of the present utility model, when the second through hole is set to be a rectangle with a length of 4 mm, the first type of through hole 1 is a circle with a diameter of 2 mm;

[0054] like Figure 3 As shown, in one embodiment of the present utility model, when the second through hole is set to be a rectangle with a length of 4 mm, the first through hole is a square with a length of 2 mm;

[0055] like Figure 4 As shown, in one embodiment of the present utility model, when the second through hole is set to be a rhombus with a length of 4 mm and a width of 2 mm, the first type of through hole 1 is a circle with a diameter of 2 mm.

[0056] In summary, the shapes of the first type through holes 1 and the second type through holes 2 can be changed according to actual conditions.

[0057] In a preferred embodiment of the present invention, the spacing between each column of second-type through holes 2 and an adjacent column of first-type through holes 1 is 7 mm.

[0058] Specifically, in the above embodiment, the spacing between the second type through hole 2 and the adjacent first type through hole 1 is 7 mm;

[0059] When a very large short-circuit current passes through, the second through hole has a longer length, so the narrow neck of the second type of through hole 2 has a shorter melting time. At this time, the fuse has begun the "arcing-arcing-breaking" action process. When the narrow neck of the first type of through hole 1 begins to melt and participate in the process of breaking the current, the total energy on the conductive substrate has been reduced, so that the shell material of the fuse can better withstand the impact of the breaking energy, thereby improving the breaking capacity.

[0060] In a preferred embodiment of the present invention, the number of the first type of through holes 1 in each column of the first type of through holes 1 is equal to the number of the second type of through holes 2 in each column of the second type of through holes 2 .

[0061] In a preferred embodiment of the present invention, the material of the fuse element is copper, silver or a copper-silver composite material.

[0062] A fuse, comprising any one of the fuse elements described above.

[0063] In summary, when a very large short-circuit current passes through, the current passing through the narrow neck of the second type through hole 2 in the utility model is the same as the current passing through the narrow neck of the first type through hole 1. Since the length of the second type through hole 2 is longer, the length of the narrow neck of the second type through hole 2 is longer, so the resistance is higher, the power is larger, and it is heated to the melting arc temperature of the fuse fuse in a shorter time, and the arc is first started and melted;

[0064] Since the lengths of the through holes of the conventional fuse are the same, the lengths of the narrow necks of the through holes are also the same, so arcs will be started at the same time and later than that of the present invention, and the accumulated energy is large.

[0065] Therefore, compared with the traditional fuse design, the utility model has a shorter pre-arcing time, smaller peak current, lower breaking energy and stronger breaking capacity when breaking high current.

[0066] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuse element, suitable for a fuse; characterized in that: The fuse element comprises a conductive substrate, and a central region of the conductive substrate is provided with a plurality of rows of first-type through holes; The conductive substrate is also provided with two rows of second-type through holes, and the two rows of the second-type through holes are respectively provided on both sides of the central area; The length of the second type of through hole is greater than the length of the first type of through hole.

2. The fuse element according to claim 1, characterized in that: The length of the second type of through holes is 4 mm.

3. The fuse element according to claim 1, characterized in that: In each column of the second-type through holes, a first distance between two adjacent second-type through holes is not greater than a second distance between two adjacent first-type through holes in each column of the first-type through holes.

4. The fuse element according to claim 3, characterized in that: The first distance between two adjacent second-type through holes is 0.25 mm.

5. The fuse element according to claim 1, characterized in that: The second type of through holes are in the shape of a racetrack, a rhombus, or a rectangle.

6. The fuse element according to claim 1, characterized in that: The distance between each column of the second-type through holes and an adjacent column of the first-type through holes is 7 mm.

7. The fuse element according to claim 1, characterized in that: The number of the first type of through-holes in each column of the first type of through-holes is equal to the number of the second type of through-holes in each column of the second type of through-holes.

8. The fuse element according to claim 1, characterized in that: The material of the fuse element is copper, silver or a copper-silver composite material.

9. A fuse, characterized in that: Comprising a fuse element as described in any one of claims 1-8.

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