Fuse

Abstract

The invention of the present application provides a fuse that deals with high voltages and high currents while maintaining the size of the bushing of the fuse. The fuse is a fuse (900) provided with a bushing (100), terminal parts (300) on both sides, and a fuse element (200) housed in the bushing (100), and is characterized in that the fuse element (200) has a wave shape provided with a trough part (220) and a crest part (230), and has a fusing part (240), and a cutout part (235) from which an end part (234) is cut off is provided in a tip part (231) of the crest part (230).

Description

Technical Field

[0001] The present invention relates to a fuse mainly used in automobile circuits and the like, and more particularly, to a fuse in which a fuse element is inserted into and accommodated in a bushing. Background Art

[0002] In the past, fuses were used to protect circuits installed in automobiles and other devices and various electrical components connected to the circuits. Specifically, when an unexpected overcurrent flows in the circuit, the fuse element built into the fuse melts due to heat generated by the overcurrent, thereby protecting the various electrical components from excessive current flow.

[0003] In addition, there are various types of fuses according to the intended use. For example, the fuse described in Patent Document 1 inserts the fuse element into the inside of a cylindrical sleeve to hold it. In addition, in recent years, fuses that can cope with high voltage and high current have become in demand, and sometimes the number of fuse parts is increased or the total length of the fuse element is increased. However, when the structure of the fuse element becomes complicated by increasing the number of fuse parts or increasing the total length of the fuse element, the width, length, height, etc. of the fuse element tend to increase as a whole. This trend also leads to the problem of increasing the sleeve that accommodates the fuse element.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-43573 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] Therefore, in view of the above problems, the present invention provides a fuse for coping with high voltage and high current while maintaining the bushing size.

[0009] Technical solutions for solving technical problems

[0010] The fuse according to the invention of the present application is characterized in that it comprises a sleeve, terminal portions on both sides, and a fuse element accommodated in the sleeve, wherein the fuse element is in a wave shape having a trough portion and a peak portion, and has a fuse portion, and a notch portion with the end portion cut off is provided in the front end portion of the peak portion.

[0011] According to the above-mentioned feature, the cutout portion is provided, so even when the structure of the fuse element is complicated to cope with high voltage and high current, the end of the crest portion of the fuse element does not interfere with the opening portion and the inner surface of the sleeve to hinder the insertion and accommodation of the fuse element. As a result, the sleeve size can be maintained without enlarging the sleeve.

[0012] The fuse according to the invention of the present application is characterized in that the fuse portion is arranged along a center line of connection end portions of both sides of the fuse element.

[0013] According to the above features, the fuse is arranged at a position away from the inner surface of the bushing, so that the arc generated in the fuse can be efficiently extinguished by the internal arc extinguishing material at the position away from the inner surface of the bushing.

[0014] The fuse according to the invention of the present application is characterized in that the fuse portion is provided at the trough portion of the fuse element.

[0015] According to the above characteristics, the fuse is arranged in the trough portion, and is therefore arranged at a position away from the inner surface of the sleeve. Therefore, the arc generated in the fuse is efficiently extinguished by the internal arc extinguishing material at a position away from the inner surface of the sleeve.

[0016] The fuse according to the invention of the present application is characterized in that the crest portion is provided so as to protrude only on one side from a center line of connection end portions connecting both sides of the fuse element.

[0017] According to the above features, the fuse element can be easily inserted from the opening of the bushing.

[0018] Effects of the Invention

[0019] As described above, the fuse of the invention of the present application can cope with high voltage and high current while maintaining the bushing size. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall perspective view of the fuse of the present invention after being exploded.

[0021] Figure 2 (a) is a top view of the fuse element. Figure 2 (b) is a side view of the fuse element, Figure 2 (c) is the front view of the fuse element.

[0022] Figure 3 This is a perspective view of the entire assembled fuse.

[0023] Figure 4 (a) is the side view of the fuse. Figure 4 (b) is a top view of the fuse.

[0024] Figure 5 (a) is along Figure 4 The cross-sectional view taken along line AA of Figure 5 (b) is along Figure 4A cross-sectional view taken along line BB.

[0025] Description of Reference Numerals

[0026] 100: bushing, 200: fuse element, 220: trough portion, 230: crest portion, 231: front end portion, 234: end portion, 235: cutout portion, 240: fuse portion, 300: terminal portion, 900: fuse. DETAILED DESCRIPTION

[0027] Hereinafter, the embodiments of the invention of the present application will be described with reference to the accompanying drawings. The embodiments described below show the shapes, materials, etc. of the components of the fuse, which are only examples and are not limited thereto. In addition, the "up and down direction" described herein is a direction at right angles to the length direction of the fuse element.

[0028] First, in Figure 1 2 shows a fuse 900 according to the invention of the present application. Figure 1 It is an overall perspective view of the fuse 900 after being exploded.

[0029] like Figure 1 As shown, the fuse 900 includes a sleeve 100, a fuse element 200 accommodated in the sleeve 100, and terminal portions 300 connected to both ends of the fuse element 200. The sleeve 100 is formed into a cylindrical shape with an opening portion 120 at the end portions 110 on both sides, and is configured to accommodate the fuse element 200 in the internal accommodation space 130. It should be noted that the sleeve 100 can be made of various materials such as ceramics, synthetic resins, etc. In addition, the sleeve 100 is not limited to a cylindrical shape with a circular cross section, and can have any shape as long as the sleeve 100 has an opening portion 120 that can insert the fuse element 200 inside, such as a box shape with a quadrilateral cross section.

[0030] The terminal portion 300 is made of metal and includes a cover portion 310 that fits into the end portion 110 of the sleeve 100 from the outside and a flat connection portion 320 that connects to an external circuit. When the cover portion 310 is inserted into the end portion 110 of the sleeve 100, the side surface 311 of the cover portion 310 can block the opening 120 of the sleeve 100.

[0031] Next, we will refer to Figure 2 The structure of the fuse element 200 is described in detail. It should be noted that Figure 2 (a) is a top view of the fuse element 200, Figure 2 (b) is a side view of the fuse element 200, Figure 2 (c) is a front view of the fuse element 200 .

[0032] like Figure 2As shown, the fuse element 200 is formed into a long strip shape by a sheet of metal plate in the shape of a thin plate, and has a pair of flat connecting ends 210 and a trough portion 220 and a crest portion 230 between the connecting ends 210, and a wave shape is formed by the trough portion 220 and the crest portion 230. The trough portion 220 and the crest portion 230 are formed by bending a sheet of metal plate in the shape of a thin plate into a wave shape. In addition, the trough portion 220 is a flat surface and is parallel to the center line P of the connecting ends 210 connecting the two sides. In addition, a fuse portion 240 is provided in each trough portion 220, and the fuse portion 240 is formed by forming a plurality of small holes 221. In addition, each fuse portion 240 is arranged along the center line P of the connecting ends 210 connecting the two sides.

[0033] In addition, when viewed from the side, a peak portion 230 protruding from the trough portion 220 in a substantially U-shape is provided between the trough portions 220. The peak portion 230 includes a front end portion 231 and side surfaces 232 extending from the front end portion 231 to both sides and connected to the trough portion 220. Figure 2 As shown in (b) , in a side view, the peak portion 230 protrudes only on one side (the upper side in the figure) of the center line P connecting the connection end portions 210 on both sides.

[0034] Furthermore, a notch portion 235 is provided at the front end portion 231 of the crest portion 230 by cutting off the end portion 234 of the front end portion 231. Specifically, Figure 2 As shown in (a) , in a plan view, the ends 234 of the peak portion 230 are located on both sides of the center line P, and the ends 234 are cut away in a substantially U-shape toward the center line P, ie, inward, and the cut away portions become cutout portions 235 .

[0035] It should be pointed out that Figure 2 As shown, the fuse portion 240 is only disposed at the trough portion 220 and not at the peak portion 230. Figure 2 As shown in (b), in a side view, the peak portion 230 protrudes from only one side (the upper side in the figure) of the center line P connecting the connecting ends 210 on both sides, but the present invention is not limited thereto, and the peak portion 230 may also protrude to both sides (the upper side and the lower side in the figure) of the center line P. Figure 2 As shown in (a) , the notches 235 are provided at the ends 234 on both sides of the tip 231 of the peak portion 230 , but the present invention is not limited thereto, and the notch 235 may be provided only at the end 234 on one side of the tip 231 .

[0036] In addition, if Figure 2As shown, the fuse element 200 has a plurality of fuse parts 240. Furthermore, the fuse element 200 is a wave shape, so the total length of the fuse element 200 increases. In other words, the total length of the current path flowing through the fuse element 200 increases. Therefore, the fuse 900 of the invention of the present application can cope with high voltage and high current. It should be noted that the number of fuse parts 240 of the fuse element 200 and the number of waves composed of the trough part 220 and the peak part 230 can be Figure 2 Any quantity other than that shown.

[0037] In addition, if Figure 1 As shown, when assembling the fuse 900, the fuse element 200 is inserted from one opening 120 of the sleeve 100 and accommodated inside the sleeve 100. Next, the terminal part 300 is attached to the end parts 110 on both sides of the sleeve 100 and the opening 120 is closed. Figures 3 to 5 As shown, the assembly of fuse 900 is completed. It should be noted that Figure 3 is an overall three-dimensional diagram of the fuse 900. Figure 4 (a) is a side view of the fuse 900, Figure 4 (b) is a top view of the fuse 900. Figure 5 (a) is along Figure 4 The cross-sectional view taken along line AA of Figure 5 (b) is along Figure 4 A cross-sectional view taken along line BB.

[0038] like Figures 3 to 5 As shown, in the assembled fuse 900, the connection ends 210 on both sides of the fuse element 200 are electrically connected to the terminal part 300 respectively. In addition, the fuse 900 electrically connects the connection part 320 of the terminal part 300 to the circuit and is installed in the circuit. Then, the current flowing through the circuit flows from one terminal part 300 to the other terminal part 300 via the fuse element 200. When an unexpected overcurrent flows through the circuit, the fuse part 240 of the fuse element 200 contained in the sleeve 100 heats up and melts, cutting off the overcurrent. It should be noted that the sleeve 100 is encapsulated with granular arc extinguishing material, and is in a state where the surrounding of the fuse element 200 is filled with arc extinguishing material. Therefore, the arc generated when the fuse part 240 melts is quickly extinguished by the surrounding arc extinguishing material.

[0039] In addition, if Figure 5As shown, the vertical cross-section of the cylindrical sleeve 100 is circular. The fuse element 200 is accommodated in the accommodation space 130 of the sleeve 100, so that the crest portion 230 of the fuse element 200 is in contact with or very close to the circular inner surface 101 of the sleeve 100. In this way, by bending the crest portion 230 of the fuse element 200 until it is in contact with or very close to the inner surface 101 of the sleeve 100, the crest portion 230 can be greatly bent upward to the limit, and as a result, the total length of the fuse element 200 can be further increased.

[0040] Then, the cutout portion 235 is provided at the end 234 of the front end portion 231 of the crest portion 230, so even if the crest portion 230 of the fuse element 200 is bent to contact or be very close to the inner surface 101 of the sleeve 100, when the fuse element 200 is inserted from the opening 120 of the sleeve 100 to the inside and accommodated, the end 234 of the crest portion 230 does not interfere with the opening 120 and the inner surface 101 of the sleeve 100 to hinder the insertion and accommodation of the fuse element 200. As described above, even if the structure of the fuse element is complicated to cope with high voltage and high current, the fuse 900 of the invention of the present application can prevent interference with the sleeve 100, and as a result, the sleeve 100 does not need to be enlarged and the size of the sleeve 100 can be maintained.

[0041] In addition, if Figure 5 As shown in (b), the fuse 240 is disposed in the trough 220 and is thus disposed at a position away from the inner surface 101 of the bushing 100. Therefore, at a position away from the inner surface 101 of the bushing 100, the arc generated in the fuse 240 is efficiently extinguished by the internal arc extinguishing material.

[0042] Furthermore, each fuse part 240 is arranged along the center line P of the connection end part 210 connecting the two sides, so each fuse part 240 is efficiently arranged at a position away from the inner surface 101 of the bushing 100. Therefore, at a place away from the inner surface 101 of the bushing 100, the arc generated in the fuse part 240 is effectively extinguished by the internal arc extinguishing material and the like. It should be pointed out that each fuse part 240 is arranged in parallel along the center line P of the connection end part 210 connecting the two sides, but it is not limited to this, and each fuse part 240 can be arranged at any position in any posture. In addition, the fuse part 240 is only arranged at the trough part 220, but not at the peak part 230, but it is not limited to this, and the fuse part 240 can be arranged at any position of the fuse element 200, such as at the trough part 220 or the peak part 230.

[0043] In addition, if Figure 5As shown in (b), the crest portion 230 protrudes from one side (the upper side in the figure) of the center line P of the connection end portions 210 connecting both sides, so that the fuse element 200 can be easily inserted from the opening 120 of the bushing 100 .

[0044] In addition, the fuse element 200 is composed of a metal plate in a thin plate shape, but it is not limited to this, and it can also be composed of multiple metal plates. In addition, the fuse 900 has a fuse element 200, but it is not limited to this, and it can also include multiple fuse elements 200. In addition, a plurality of small holes are provided in the fuse element 200 to form the fuse part 240, but it is not limited to this. For example, the fuse part 240 can also be formed by partially reducing the thickness of the trough part 220, or by depositing a low melting point metal composed of tin, lead, silver, nickel, or their alloys in the narrow part of the trough part 220. In addition, a material such as silicon can also be attached to the U-shaped bent part on the back side of the peak part 230.

[0045] The fuse of the invention of the present application is not limited to the above-described embodiment, and various modifications and combinations can be made within the scope of the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of rights of the present invention.

Claims

1. A fuse, characterized in that: A fuse element is provided which comprises a sleeve, terminal portions on both sides and a fuse element accommodated in the sleeve. The fuse element is in a wave shape with a trough portion and a peak portion, and has a fuse portion. A notch portion having an end cut off is provided in a front end portion of the peak portion.

2. The fuse according to claim 1, characterized in that: The fuse portion is arranged along a center line of connection ends of both sides of the fuse element.

3. The fuse according to claim 1 or 2, characterized in that: The fuse portion is provided at the trough portion of the fuse element.

4. The fuse according to claim 1 or 2, characterized in that: The crest portion is provided so as to protrude only on one side from the center line of the connection end portions of the fuse element connecting both sides.

5. The fuse according to claim 3, characterized in that: The crest portion is provided so as to protrude only on one side from the center line of the connection end portions of the fuse element connecting both sides.

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