A surface mount fuse

Abstract

A surface mounted fuse comprises an insulating shell with one side recessed inwardly to form an accommodating cavity, a filler filled in the accommodating cavity and a fuse body, wherein the fuse body comprises two conductive electrodes and a fuse part arranged between the two conductive electrodes, and the two ends of the fuse part are respectively connected to the two conductive electrodes through two connecting parts, and a first connecting part of each conductive electrode close to the connecting part is fixedly connected to a second connecting part of a corresponding connecting part close to the conductive electrode; the width of the second connecting part is smaller than the width of the first connecting part, and each first connecting part further comprises two supporting parts, and the second connecting part is fixedly connected to the middle part of the first connecting part located between the two supporting parts; the first connecting part is recessed inwardly between the supporting part and the adjacent middle part to form a first through hole; the supporting part limits the depth of the fuse body entering the accommodating cavity to ensure that the position of the fuse body in the accommodating cavity is fixed; the first through hole ensures that the filler returns to the accommodating cavity through the first through hole.

Description

Technical Field

[0001] The invention relates to the field of electrical protection elements, and in particular provides a surface mounted fuse having a fuse body with a hook portion. Background Art

[0002] In the prior art, a chip fuse disclosed in CN201721097141.5 includes an insulating shell with one side recessed inward to form a receiving cavity, a fuse body including two conductive electrodes and a fuse part, and a filler filled in the receiving cavity. In the actual production process, this design results in the fuse body entering the receiving cavity of the insulating shell in an unfixed position; when the fuse body is assembled, the filler in the receiving cavity will be squeezed out by the fuse body to the upper surface of the insulating shell, and when it solidifies, the subsequent conductive electrode is bent to form a welding plane, which will cause the welding surface to be uneven due to the overflow of the filler, thereby causing problems such as unstable fusing performance and poor welding performance of the product. Summary of the invention

[0003] The object of the present invention is to provide a surface mounted fuse with more stable fusing performance.

[0004] In order to achieve the above object, the present invention provides a surface mount fuse, comprising:

[0005] An insulating shell, one side of which is recessed inwardly to form a receiving cavity;

[0006] A fuse body, the fuse body comprising two conductive electrodes and a fuse part arranged between the two conductive electrodes, two ends of the fuse part are respectively connected to the two conductive electrodes through two connecting parts, the fuse part and the two connecting parts are located in the accommodating cavity, and the two conductive electrodes are located outside the accommodating cavity; the position of each conductive electrode close to the connecting part is a first connecting part, and the position of each connecting part close to the conductive electrode is a second connecting part, and the first connecting part is fixedly connected to the second connecting part;

[0007] A filler, the filler is filled in the accommodating cavity;

[0008] The width of the second connection part is smaller than that of the first connection part, and each of the first connection parts also includes two supporting parts, and the second connection part is fixedly connected to the middle part of the first connection part located between the two supporting parts; when the first connection part is located in the plane where the second connection part is located, the projection of at least a part of each of the supporting parts on the horizontal plane intersects with the projection of the insulating shell on both sides of the opening of the accommodating cavity on the horizontal plane.

[0009] The filler may be an arc extinguishing agent that mainly plays an arc extinguishing role. The middle portion and the second connecting portion are directly adjacent to each other. When the fuse body is assembled into the accommodating cavity, the conductive electrode has not been bent yet, and the first connecting portion is located in the plane where the second connecting portion is located. At this time, when the projection of at least a portion of each of the supporting portions on the horizontal plane intersects with the projection of the insulating shell on both sides of the opening of the accommodating cavity on the horizontal plane, each supporting portion will have at least a portion of the insulating shell on both sides of the opening of the accommodating cavity in conflict with the portion, limiting the depth of the fuse body entering the accommodating cavity, thereby ensuring that the position of the fuse body in the accommodating cavity is fixed.

[0010] In some embodiments, the first connecting portion is recessed inwardly between the supporting portion and the adjacent middle portion to form a first through hole. The first through hole is provided to ensure that during the installation of the fuse body into the accommodating cavity, the overflowed filling material with high fluidity in the accommodating cavity will return to the accommodating cavity through the first through hole, avoiding it from remaining in other parts of the insulating housing outside the accommodating cavity, and also preventing it from flowing to the upper surface of the insulating housing through the end of the supporting portion due to the edge guiding effect of the fuse body.

[0011] In some embodiments, each of the second connecting portions is recessed inwardly toward a side wall of the supporting portion at a corresponding position to form a second through hole.

[0012] In some embodiments, the first connecting portion is recessed inwardly between the supporting portion and the adjacent middle portion to form a first through hole, each of the second connecting portions is recessed inwardly toward the side wall of the supporting portion at the corresponding position to form a second through hole, and the first through hole is adjacent to the second through hole at the corresponding position and merges to form a third through hole.

[0013] In some embodiments, the two supporting portions of each of the first connecting portions include a first supporting portion and a second supporting portion, and a supporting surface of the first supporting portion and a supporting surface of the second supporting portion are located in the same plane.

[0014] In some embodiments, when the first connection portion is located in the plane where the second connection portion is located, the projection of each of the support portions on the horizontal plane is within the projection of the insulating shell on both sides of the opening of the accommodating cavity on the horizontal plane.

[0015] In some embodiments, the angle between the plane where the connection part of the same fuse body is located and the plane where another connection part is located is between 5° and 60°. In actual production, after the fuse body to be loaded into the accommodating cavity is produced, the connection part on each side and the conductive electrode are located in the same plane, and the planes on both sides intersect, preferably at an angle of 5° to 60°, so that when the fuse body is loaded into the insulating housing, the fuse body can always collide with the edge line in the width direction of the opening of the accommodating cavity, ensuring that the filler will not be squeezed out from the gap between the edge line and the fuse body and then enter the upper surface of the insulating housing.

[0016] In some embodiments, each of the connecting parts is further provided with a fourth through hole, and the fourth through hole is located between the second connecting part and the fuse part. The filler can flow back into the accommodating cavity through the fourth through hole during the installation process. The provision of the fourth through hole will further reduce the resistance of the filler to the fuse body during the installation process, and in the finished surface mount fuse, the filler in the fourth through hole will also play a role in reinforcing the fuse body.

[0017] In some embodiments, an inner wall of the first through hole is arc-shaped.

[0018] In some embodiments, when the first connection portion is located in the plane where the second connection portion is located, the inner wall of the first through hole and the inner wall of the second through hole belong to the same arc. This makes the production of the fuse body more convenient.

[0019] The present invention also provides a method for producing a surface mounted fuse, which comprises the following steps:

[0020] Manufacturing a fuse array: producing a fuse body by an integrated molding method, wherein the fuse body is provided with a conductive electrode, a fusing portion, a connecting portion, a supporting portion, a third through hole and a fourth through hole, and the ends of the conductive electrodes of a plurality of the fuse bodies are connected together by two connecting ribs to form a fuse array;

[0021] Bending: bending the fuse array so that the angle between the planes where the two connecting portions of each fuse body are located is between 5° and 60°;

[0022] Manufacturing an insulating shell array: arranging the insulating shells at intervals, and filling the filling material with strong fluidity into the accommodating cavities of the insulating shells to form an insulating shell array;

[0023] Installing the fuse array: vertically placing each fuse body into a corresponding insulating housing in the insulating housing array until the support portion contacts the insulating housing at a corresponding position;

[0024] Curing: leaving the filler to stand until it is leveled to form a semi-finished product, and curing the semi-finished product at high temperature to form a pre-finished product;

[0025] Flattening and cutting: Flattening the single-side conductive electrode of the fuse array until it fits the upper wall of the insulating shell, cutting off the connecting rib, and bending the end of the conductive electrode to form a surface mount fuse.

[0026] The surface mount fuse of the present invention limits the depth of the fuse body entering the accommodating cavity by setting the support part, thereby ensuring that the position of the fuse body in the accommodating cavity is fixed, and the consistency of batch products is guaranteed. In addition, by setting the first through hole and / or the second through hole, it is ensured that during the installation of the fuse body into the accommodating cavity, the overflowed filling material with strong fluidity in the accommodating cavity will return to the accommodating cavity through the first through hole, avoiding it from remaining in other parts of the insulating shell outside the accommodating cavity, and will not flow to the upper surface of the insulating shell through the end of the support part due to the edge guiding effect of the fuse body.

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the surface mount fuse in the present invention;

[0029] Figure 2 It is a schematic diagram of the fuse main body structure of the surface mount fuse in the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the surface mount fuse in the present invention during the production process. DETAILED DESCRIPTION

[0031] The present invention can be further understood by the specific examples of the present invention given below, but they are not intended to limit the present invention.

[0032] like Figure 1-3As shown, this embodiment provides a surface mount fuse, including an insulating shell 2 and a fuse body, one side of the insulating shell 2 is recessed inward to form a receiving cavity, and the receiving cavity is filled with filler. The fuse body includes two conductive electrodes 11 and a fuse part 12 arranged between the two conductive electrodes 11, and the two ends of the fuse part 12 are respectively connected to the two conductive electrodes 11 through two connecting parts 13, the fuse part 12 and the two connecting parts 13 are located in the receiving cavity, and the two conductive electrodes 11 are located outside the receiving cavity, which is used to realize the electrical connection between the surface mount fuse and the external circuit. The position of each conductive electrode 11 close to the connecting part 13 is a first connecting part 111, and the position of each connecting part 13 close to the conductive electrode 11 is a second connecting part 131, and the first connecting part 111 is fixedly connected to the second connecting part 131. In this embodiment, the fuse body is integrally formed, and the first connecting part 111 and the second connecting part 131 are two adjacent parts of the fuse body.

[0033] The width of the second connection portion 131 is smaller than that of the first connection portion 111. Each first connection portion 111 further includes two support portions 113. The second connection portion 131 is fixedly connected to the middle portion of the first connection portion 111 located between the two support portions 113. Figure 2 As shown, when the first connection portion 111 is located in the plane where the second connection portion 131 is located, the projection of at least a portion of each support portion 113 on the horizontal plane intersects with the projection of the insulating shell on both sides of the opening of the accommodating cavity on the horizontal plane. In this embodiment, the projection of each support portion 113 on the horizontal plane is within the projection of the insulating shell 2 on both sides of the opening of the accommodating cavity on the horizontal plane. In this embodiment, the two support portions 113 of each first connection portion 111 include a first support portion and a second support portion, and the support surface of the first support portion and the support surface of the second support portion are located in the same plane.

[0034] The filler may be an arc extinguishing agent that mainly extinguishes the arc. The middle portion and the second connecting portion 131 are directly adjacent to each other. When the fuse body is assembled into the accommodating cavity, as shown in FIG. Figure 3 As shown, the conductive electrode 11 has not been bent, and the first connection portion 111 is located in the plane where the second connection portion 131 is located. At this time, when the projection of at least a portion of each support portion 113 on the horizontal plane intersects with the projection of the insulating housing 2 on both sides of the opening of the accommodating cavity on the horizontal plane, at least a portion of each support portion 113 will collide with the portion of the insulating housing 2 on both sides of the opening of the accommodating cavity, limiting the depth of the fuse body entering the accommodating cavity, thereby ensuring that the position of the fuse body in the accommodating cavity is fixed.

[0035] like Figure 1As shown, the first connection portion 111 is recessed inwardly between the support portion 113 and the adjacent middle portion to form a first through hole 112, and each second connection portion 131 is recessed inwardly toward the side wall of the support portion 113 at the corresponding position to form a second through hole 132. Figure 2 As shown, in this embodiment, the first through hole 112 is adjacent to the second through hole 132 at the corresponding position and merges to form a third through hole 3. Figure 1 As shown, the inner wall of the first through hole 112 is arc-shaped. Figure 2 As shown, when the first connection portion 111 is located in the plane where the second connection portion 131 is located, the inner wall of the first through hole 112 and the inner wall of the second through hole 132 belong to the same arc and together constitute the inner wall of the third through hole 3. This makes the production of the fuse body more convenient.

[0036] In this embodiment, the angle between the plane where the connection portion 13 of the same fuse body is located and the plane where another connection portion 13 is located is between 5° and 60°. Figure 2-3 As shown, after the fuse body to be loaded into the accommodating cavity is produced, the connecting portion 13 on each side and the conductive electrode 11 are located in the same plane, and the planes on both sides intersect, preferably at an angle of 5°-60°, to ensure that during the process of loading the fuse body into the accommodating cavity of the insulating shell 2, the fuse body can always be in conflict with the edge line in the width direction of the opening of the accommodating cavity, ensuring that the filler with strong fluidity will not be squeezed out from the gap between the edge line and the fuse body and then enter the upper surface of the insulating shell 2.

[0037] In this embodiment, each connection portion 13 is further provided with a fourth through hole 4, and the fourth through hole 4 is located between the second connection portion 131 and the fuse portion 12. The filler can flow back into the accommodating cavity through the fourth through hole 4 during the installation process. The provision of the fourth through hole 4 will further reduce the resistance of the filler to the fuse body during the installation process, and in the finished surface mount fuse, the filler in the fourth through hole 4 will also reinforce the fuse body.

[0038] The production method of the surface mount fuse in this embodiment includes the following steps:

[0039] 1) Manufacturing fuse array: The fuse body is produced by an integrated molding method, and the fuse body is provided with a conductive electrode 11, a fuse part 12, a connecting part 13, a supporting part 113, a third through hole 3 and a fourth through hole 4. The ends of the conductive electrodes 11 of different fuse bodies are connected together by two connecting ribs to form a fuse array;

[0040] 2) Bending: Use a bending die to bend the fuse array so that the angle between the planes where the two connecting parts of each fuse body are located is between 5° and 60°;

[0041] 3) Manufacturing an insulating shell array: arranging the insulating shells at intervals, and filling the filling material with strong fluidity into the accommodating cavities of the insulating shells to form an insulating shell array;

[0042] 4) Installing the fuse array: vertically placing each fuse body into the receiving cavity of the corresponding insulating housing in the insulating housing array until the support portion 113 contacts the insulating housing 2 at the corresponding position;

[0043] 5) Curing: let the filler stand until it is leveled to form a semi-finished product, and cure the semi-finished product at high temperature to form a pre-finished product;

[0044] 6) Flattening and cutting: Flatten the single-side conductive electrode 11 of the fuse array until it fits the upper wall of the insulating housing 2, cut off the connecting rib, and bend the end of the conductive electrode 11 to form a surface mount fuse.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A surface mount fuse, comprising: An insulating shell, one side of which is recessed inwardly to form a receiving cavity; A fuse body, the fuse body comprising two conductive electrodes and a fuse part arranged between the two conductive electrodes, two ends of the fuse part are respectively connected to the two conductive electrodes through connecting parts, the fuse part and the two connecting parts are located in the accommodating cavity, and the two conductive electrodes are located outside the accommodating cavity; the position of each conductive electrode close to the connecting part is a first connecting part, and the position of each connecting part close to the conductive electrode is a second connecting part, and the first connecting part is fixedly connected to the second connecting part; Filler, the filler is filled in the accommodating cavity; characterized in that, The width of the second connection part is smaller than that of the first connection part, and each of the first connection parts further comprises two supporting parts, and the second connection part is fixedly connected to the middle part of the first connection part located between the two supporting parts; when the fuse body is assembled into the accommodating cavity and the first connection part is located in the plane where the second connection part is located, the projection of at least a part of each of the supporting parts on the horizontal plane intersects with the projection of the insulating shell on both sides of the opening of the accommodating cavity on the horizontal plane, and at least a part of each of the supporting parts conflicts with the parts of the insulating shell on both sides of the opening of the accommodating cavity; the first connection part is recessed inwardly between the supporting part and the adjacent middle part to form a first through hole, and the first through hole is configured to allow the filler overflowing from the accommodating cavity to return to the accommodating cavity.

2. The surface mount fuse according to claim 1, characterized in that: Each of the second connecting portions is recessed inwardly toward the side wall of the supporting portion at the corresponding position to form a second through hole.

3. The surface mount fuse according to claim 1, characterized in that: Each of the second connecting portions is recessed inwardly toward the side wall of the supporting portion at the corresponding position to form a second through hole, and the first through hole is adjacent to the second through hole at the corresponding position and merges to form a third through hole.

4. The surface mount fuse according to any one of claims 1 to 3, characterized in that: The two supporting portions of each of the first connecting portions include a first supporting portion and a second supporting portion, and a supporting surface of the first supporting portion and a supporting surface of the second supporting portion are located in the same plane.

5. The surface mount fuse according to any one of claims 1 to 3, characterized in that: When the first connection portion is located in the plane where the second connection portion is located, the projection of each of the support portions on the horizontal plane is within the projection of the insulating shell on both sides of the opening of the accommodating cavity on the horizontal plane.

6. The surface mount fuse according to claim 4, characterized in that: The angle between the plane where the connecting portion of the same fuse body is located and the plane where another connecting portion is located is between 5° and 60°.

7. The surface mount fuse according to any one of claims 1 to 3 and 6, characterized in that: Each of the connecting parts is also provided with a fourth through hole, and the fourth through hole is located between the second connecting part and the fuse part.

8. The surface mount fuse according to claim 1, characterized in that: The inner wall of the first through hole is arc-shaped.

9. The surface mount fuse according to claim 3, characterized in that: When the first connection portion is located in the plane where the second connection portion is located, the inner wall of the first through hole and the inner wall of the second through hole belong to the same arc.

10. The surface mount fuse according to claim 7, characterized in that: The production method of the surface mount fuse comprises the following steps: Manufacturing a fuse array: producing a fuse body by an integrated molding method, wherein the fuse body is provided with a conductive electrode, a fusing portion, a connecting portion, a supporting portion, a third through hole and a fourth through hole, and the ends of the conductive electrodes of a plurality of the fuse bodies are connected together by two connecting ribs to form a fuse array; Bending: bending the fuse array so that the angle between the planes where the two connecting portions of each fuse body are located is between 5° and 60°; Manufacturing an insulating shell array: arranging the insulating shells at intervals, and filling the filling material with strong fluidity into the accommodating cavities of the insulating shells to form an insulating shell array; Installing the fuse array: vertically placing each fuse body into a corresponding insulating housing in the insulating housing array until the support portion contacts the insulating housing at a corresponding position; Curing: leaving the filler to stand until it is leveled to form a semi-finished product, and curing the semi-finished product at high temperature to form a pre-finished product; Flattening and cutting: Flattening the single-side conductive electrode of the fuse array until it fits the upper wall of the insulating shell, cutting off the connecting rib, and bending the end of the conductive electrode to form a surface mount fuse.

Images