Fuse

Abstract

The invention provides a fuse which effectively prevents the shell from expanding due to internal pressure. A fuse (500) is provided with a fuse element (400) having a fusing section (420) provided between a pair of terminal sections (410), and a housing (300) for accommodating the fuse element (400), the housing (300) being provided with wall sections, and reinforcing sections (350, 360) for connecting the wall sections being provided in at least one location of the housing (300).

Description

Technical Field

[0001] The invention of the present application relates to a fuse mainly used in automobile circuits and the like, and more particularly to a fuse having a fuse element housed in a housing. Background Art

[0002] In the prior art, fuses have been used to protect circuits installed in automobiles, etc. and various electrical components connected to the circuits. Specifically, when an unintentional overcurrent flows in the circuit, due to the heat generated by the overcurrent, the fusing portion of the fuse element built into the fuse is melted to protect various electronic components so that excessive current does not flow in the various electronic components.

[0003] In addition, there are various types of fuses depending on the purpose, and for example, a fuse described in Patent Document 1 is known.

[0004] The fuse described in Patent Document 1 is of a type in which a fuse element is accommodated inside a housing, and the fuse element has a pair of terminal portions and a fuse portion disposed between the terminal portions. In addition, in recent years, in order to cope with high voltage and high current, it is desired to increase the number of fuse portions to increase the capacity of the fuse. When the number of fuse portions increases, the housing expands due to the internal pressure of the gas generated when the fuse portion melts.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2021-93323 Summary of the invention

[0008] Technical problem to be solved by the invention

[0009] Therefore, the invention of the present application provides a fuse which effectively prevents the case from expanding due to the internal pressure.

[0010] Technical solutions for solving technical problems

[0011] The fuse according to the invention of the present application comprises: a fuse element having a fuse portion arranged between a pair of terminal portions; and a housing for accommodating the fuse element, wherein the housing comprises a wall portion, and a reinforcement portion connected to the wall portion is provided at at least one location of the housing.

[0012] According to the above feature, the reinforcing portion firmly reinforces the housing so that the housing does not expand and deform due to the internal pressure.

[0013] Furthermore, in the fuse according to the invention of the present application, the housing includes one housing split piece and another housing split piece, and the reinforcing portion is provided so as to cross the housing split pieces on both sides.

[0014] According to the above feature, the reinforcing portion effectively prevents the case split pieces from expanding in the direction in which the case split pieces move away from each other due to the internal pressure.

[0015] In addition, in the fuse according to the invention of the present application, the reinforcement portion has a detachment portion and another detachment portion, the one detachment portion is arranged on the one shell detachment piece, and the other detachment portion is arranged on the other shell detachment piece, and the one detachment portion and the other detachment portion are configured to be connected and fixed to each other.

[0016] According to the above features, each split portion can be formed at the same time when each case split piece is formed by a conventional method of forming each case split piece (for example, injection molding, etc.).

[0017] Furthermore, in the fuse according to the invention of the present application, the front end of the one split portion and the front end of the other split portion are connected and fixed by fitting with each other.

[0018] According to the above features, one detached part is directly fitted to the other detached part simply by assembling the one housing detached piece and the other housing detached piece so as to face each other and sandwich them, so that the detached parts can be easily connected and fixed.

[0019] Furthermore, in the fuse according to the invention of the present application, the reinforcement portion is provided on the one housing split piece, and a front end of the reinforcement portion is connected and fixed to the other housing split piece.

[0020] According to the above feature, the reinforcing portion effectively prevents the case split pieces from expanding in the direction in which the case split pieces move away from each other due to the internal pressure.

[0021] Furthermore, in the fuse according to the invention of the present application, the reinforcement portion is away from an inner side surface of the accommodation space.

[0022] According to the above feature, the accommodation space is not divided into two parts, left and right, by the reinforcement part, and the accommodation space around the reinforcement part is connected to the communication space. Therefore, even when the reinforcement part is present, the arc-extinguishing material flowing from a part of the accommodation space surrounds the reinforcement part and spreads throughout the accommodation space, and the entire accommodation space is firmly filled with the arc-extinguishing material without any gaps.

[0023] Advantageous Effects of the Invention

[0024] As described above, according to the fuse of the present invention, it is possible to effectively prevent the case from expanding due to the internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall stereoscopic view of a shell disassembled piece of the fuse according to the invention of the present application.

[0026] Figure 2 (a) is a top view of the shell split piece. Figure 2 (b) is the front view of the shell disassembled piece.

[0027] Figure 3 (a) is along Figure 2 (a) is a cross-sectional view taken along line AA. Figure 3 (b) is along Figure 2 (a) is a cross-sectional view taken along line BB.

[0028] Figure 4 It is an overall stereoscopic view of another shell disassembled piece of the fuse according to the invention of the application.

[0029] Figure 5 (a) is a top view of the shell split piece. Figure 5 (b) is the front view of the shell disassembled piece.

[0030] Figure 6 (a) is along Figure 5 (a) is a cross-sectional view of the CC line, Figure 6 (b) is along Figure 5 (a) is a cross-sectional view taken along line DD.

[0031] Figure 7 It is an exploded perspective view of the fuse according to the invention of the present application.

[0032] Figure 8 (a) is a top view of the fuse in the assembled state. Figure 8 (b) is a front view of the fuse in the assembled state.

[0033] Fig. 9 (a) is along Figure 8 (a) is a cross-sectional view of line EE, Fig. 9 (b) is along Figure 8 (a) is a cross-sectional view taken along line FF.

[0034] Description of Reference Numerals

[0035] 300: housing, 340: accommodating space, 350: reinforcing portion, 360: reinforcing portion, 400: fuse element, 410: terminal portion, 420: fuse portion, 500: fuse. DETAILED DESCRIPTION

[0036] Hereinafter, various embodiments of the present invention will be described with reference to the drawings. The shape, material, etc. of each member of the fuse according to the following embodiment are merely examples and are not limited thereto.

[0037] Figures 1 to 3 The housing split piece 100 constituting the housing 300 of the fuse according to the invention of the present application is shown. Figure 1 is an overall three-dimensional diagram of the shell disassembly piece 100, Figure 2 (a) is a top view of the housing split piece 100. Figure 2 (b) is a front view of the housing split piece 100. Figure 3 (a) is along Figure 2 (a) is a cross-sectional view taken along line AA. Figure 3 (b) is along Figure 2 (a) is a cross-sectional view taken along line BB.

[0038] The shell split piece 100 is made of synthetic resin as a whole and has a substantially rectangular parallelepiped shape, and includes an upper wall portion 110 constituting a top surface, a lateral wall portion 120 constituting a side surface, and front and rear wall portions 130 constituting a front and rear surface, respectively. In addition, the shell split piece 100 includes a storage space 140 surrounded by the upper wall portion 110, the left and right wall portions 120, and the front and rear wall portions 130. In addition, the lower side of the storage space 140 is an opening surface 141, and is configured to be opposite to the opening surface 241 of the storage space 240 of the shell split piece 200 described later. Furthermore, a fitting protrusion 121 protruding downward is provided at the ends of the wall portion 120 and the wall portion 130, and the fitting protrusion 121 is fitted with a fitting recess 222 of the shell split piece 200 described later. In addition, an inwardly recessed fitting concave portion 122 is provided at the end portions of the wall portion 120 and the wall portion 130, and a fitting convex portion 221 of the housing split piece 200 described later fits with the fitting concave portion 122. In addition, an insertion portion 131 having a concave shape is formed at the end portion of the wall portion 130 so that a terminal portion 410 of a fuse element 400 described later can be inserted.

[0039] Furthermore, in the accommodation space 140 of the shell detaching piece 100, a central detaching portion 150 and detaching portions 160 located on both sides of the detaching portion 150 are provided. The central detaching portion 150 and the detaching portions 160 on both sides are connected and fixed to the central detaching portion 250 and the detaching portions 260 on both sides of the shell detaching piece 200 described later to form a reinforcing portion. In addition, the base 151 of the detaching portion 150 is fixed near the approximate center of the wall portion 110 constituting the top surface, and the front end 152 is drooped in a straight line downward. Furthermore, a fitting protrusion 153 convex downward is provided at the front end 152, and the fitting protrusion 153 is configured to fit with the fitting recess 253 of the shell detaching piece 200 described later. Similarly, the base 161 of the detaching portion 160 is fixed near the end of the wall portion 110 constituting the top surface, and the front end 162 is drooped in a straight line downward. Furthermore, a fitting protrusion 163 convex downward is provided at the front end 162, and the fitting protrusion 163 is configured to fit with a fitting recess 263 of the housing split piece 200 described later. In addition, the split part 160 is connected and fixed to the inner side of the wall part 130. Furthermore, the base 151 of the split part 150 and the base 161 of the split part 160 are connected and fixed to each other through a base reinforcement body 159 extending along the wall part 110 constituting the top surface.

[0040] Next, Figures 4 to 6 The shell split piece 200 constituting the shell 300 of the fuse according to the invention of the present application is shown. It should be noted that, Figure 4 is an overall three-dimensional diagram of the shell disassembly piece 200, Figure 5 (a) is a top view of the housing split piece 200. Figure 5 (b) is a front view of the shell split piece 200, Figure 6 (a) is along Figure 5 (a) is a cross-sectional view taken along line CC, Figure 6 (b) is along Figure 5 (a) is a cross-sectional view taken along line DD.

[0041] The shell split piece 200 is made of synthetic resin as a whole and has a substantially rectangular parallelepiped shape, and includes a lower wall portion 210 constituting a bottom surface, a lateral wall portion 220 constituting a side surface, and front and rear wall portions 230 constituting a front surface and a rear surface, respectively. In addition, the shell split piece 200 includes a storage space 240 surrounded by the lower wall portion 210, the left and right wall portions 220, and the front and rear wall portions 230. In addition, the upper side of the storage space 240 is an opening surface 241, and is configured to be opposite to the opening surface 141 of the storage space 140 of the shell split piece 100. Furthermore, an engaging protrusion 221 protruding upward is provided at the ends of the wall portion 220 and the wall portion 230, and the engaging protrusion 221 is engaged with the engaging recess 122 of the shell split piece 100. In addition, an inwardly recessed fitting concave portion 222 is provided at the ends of the wall portion 220 and the wall portion 230, and the fitting convex portion 121 of the housing split piece 100 is fitted into the fitting concave portion 222. In addition, an insertion portion 231 having a concave shape is formed at the end of the wall portion 230 so that a terminal portion 410 of a fuse element 400 described later can be inserted.

[0042] Furthermore, a central disassembly portion 250 and disassembly portions 260 located on both sides of the disassembly portion 250 are provided in the accommodation space 240 of the shell disassembly piece 200. In addition, a base 251 of the disassembly portion 250 is fixed to the vicinity of the approximate center of the wall portion 210 constituting the bottom surface, and a front end 252 protrudes linearly upward. Furthermore, a fitting recess 253 that is concave downward is provided at the front end 252, and the fitting recess 253 is configured so that the fitting protrusion 153 of the shell disassembly piece 100 fits with the front end 252. Similarly, a base 261 of the disassembly portion 260 is fixed to the vicinity of the end of the wall portion 210 constituting the bottom surface, and a front end 262 protrudes linearly upward. Furthermore, a fitting recess 263 that is concave downward is provided at the front end 262, and the fitting recess 263 is configured so that the fitting protrusion 163 of the shell disassembly piece 100 fits with the front end 262. In addition, the detaching portion 260 is connected and fixed to the inner side of the wall portion 230. Furthermore, the base 251 of the detaching portion 250 and the base 261 of the detaching portion 260 are connected and fixed to each other via a base reinforcement body 259 extending along the wall portion 210 constituting the bottom surface.

[0043] Next, we will refer to Figures 7 to 9 The method of assembling the fuse 500 of the present invention is described. It should be noted that Figure 7 is an exploded perspective view of the fuse 500. Figure 8 (a) is a top view of the fuse 500 in an assembled state, Figure 8 (b) is a front view of the fuse 500 in an assembled state. Fig. 9 (a) is along Figure 8 A cross-sectional view taken along line EE shown in (a), and Fig. 9 (b) is along Figure 8 A cross-sectional view taken along line FF shown in (a).

[0044] First, if Figure 7 As shown, the fuse element 400 is formed into an elongated shape by a thin metal plate, and has a pair of terminal parts 410 and a flat and elongated circuit part 430 between the terminal parts 410. The circuit parts 430 of the fuse element 400 are connected in parallel to each other, and a plurality of fuse parts 420 are formed in each circuit part 430. The fuse part 420 is formed to have a plurality of small holes 421.

[0045] It should be noted that the fuse element 400 has two circuit parts 430, but the present invention is not limited thereto, and may also have one circuit part 430 or more than three circuit parts 430. In addition, the fuse part 420 has a plurality of small holes 421, but the present invention is not limited thereto, for example, the thickness of the circuit part 430 may be partially reduced to form the fuse part, or a low melting point metal made of tin, lead, silver, nickel, or an alloy thereof may be deposited in a narrow portion of the circuit part 430 to form the fuse part.

[0046] In addition, if Figure 7 As shown, when the fuse 500 is assembled, the housing split piece 100 and the housing split piece 200 are sandwiched from the top and bottom of the fuse element 400, and the fuse portion 420 of the fuse element 400 is accommodated inside the housing 300. Specifically, the fuse element 400 is arranged on the opening surface 241 of the accommodation space 240 of the housing split piece 200 on the lower side, and the terminal portion 410 of the fuse element 400 is embedded in the insertion portion 231 of the housing split piece 200. In addition, the central split portion 250 and the split portions 260 on both sides are located in the gap 440 between the circuit portions 430 of the fuse element 400.

[0047] Next, the housing split piece 100 is placed on the housing split piece 200, and the insertion portion 131 of the housing split piece 100 is embedded in the terminal portion 410 of the fuse element 400 so as to cover the fuse element 400 through the opening surface 141 of the accommodation space 140 of the upper housing split piece 100. In addition, the central split portion 150 and the split portions 160 on both sides are located in the gap 440 between the circuit portions 430 of the fuse element 400, and the fitting protrusion 153 of the upper split portion 150 is embedded in the fitting recess 253 of the lower split portion 250 to be firmly fixed to each other. In particular, only by assembling the upper shell disassembly piece 100 and the lower shell disassembly piece 200 so as to face each other and sandwich them, the interlocking protrusion 153 of the upper disassembly part 150 and the interlocking recess 253 of the lower disassembly part 250 are directly engaged with each other, so that one disassembly part 150 and the other disassembly part 250 are easily connected and fixed.

[0048] Similarly, the engaging protrusion 163 of the upper detaching part 160 is engaged with the engaging recess 263 of the lower detaching part 260, and they are firmly fixed to each other. In addition, since the engaging protrusion 121 of the shell detaching piece 100 is engaged with the engaging recess 222 of the shell detaching piece 200, and the engaging protrusion 221 of the shell detaching piece 200 is engaged with the engaging recess 122 of the shell detaching piece 100, the engagement between the shell detaching piece 100 and the shell detaching piece 200 is more firmly secured.

[0049] It should be noted that the engaging protrusion 153 of the upper detaching part 150 is engaged with the engaging recess 253 of the lower detaching part 250, but the present invention is not limited thereto, and any method can be used as long as the upper detaching part 150 and the lower detaching part 250 can be connected and fixed to each other, such as a method of connecting and fixing one detaching part 150 and another detaching part 250 with an adhesive, a method of connecting and fixing one detaching part 150 and another detaching part 250 with a fastening member such as a screw, and a method of connecting and fixing one detaching part 150 and another detaching part 250 with a locking member such as a hook. Similarly, the engaging protrusion 163 of the upper detaching part 160 is engaged with the engaging recess 263 of the lower detaching part 260, but the present invention is not limited thereto, and any fixing method as described above can be used.

[0050] In this manner, the housing 300 including the one housing split piece 100 and the other housing split piece 200 accommodates the fusible portion 420 of the fuse element 400 in a sandwiched manner from above and below, thereby assembling the fuse 500. Figure 8 and Fig. 9 As shown, the accommodation space 340 composed of the upper and lower accommodation spaces ( 140 , 240 ) accommodates the fuse part 420 in a manner surrounding the periphery of the fuse part 420 of the circuit part 430 of the fuse element 400 .

[0051] It should be noted that the accommodating space 340 is filled with a granular arc-extinguishing material (not shown) by a method similar to the conventional method. For example, the arc-extinguishing material is injected into the accommodating space 340 from the filling hole 301 of the housing 300, and then the filling hole 301 is closed. At this time, since the reinforcing portion 350 formed by connecting and fixing the splitting portion 150 and the splitting portion 250 is approximately located at the center of the accommodating space 340 and away from the inner side surface 341 around the accommodating space 340, a connecting space 342 is ensured around the reinforcing portion 350 and between the inner side surface 341 of the accommodating space 340. That is, the accommodating space 340 is not divided left and right by the reinforcing portion 350, and the accommodating space 340 around the reinforcing portion 350 is connected through the connecting space 342. Therefore, even when the reinforcing portion 350 is present, the arc-extinguishing material flowing in from a part of the accommodating space 340 is spread around the periphery of the reinforcing portion 350 to the entire accommodating space 340, and the entire accommodating space 340 is firmly filled with the arc-extinguishing material without a gap.

[0052] In addition, the fuse 500 is installed by connecting the terminal portion 410 protruding laterally from the housing 300 to an external circuit. When an unexpected overcurrent flows through the circuit, etc., the fuse portion 420 of the fuse element 400 generates heat and melts to cut off the overcurrent. In addition, the arc generated when the fuse portion 420 melts is quickly extinguished by the surrounding arc extinguishing material.

[0053] Here, in order to cope with high voltage and high current, the fuse 500 is provided with a plurality of fuse parts 420. Fig. 9 As shown, the internal pressure P of the gas generated when the fuse part 420 is melted increases, and a load is applied to expand the housing 300. However, in the fuse 500 of the invention of the present application, since the reinforcing part 350 connecting the wall part of the housing 300 is provided, the housing 300 is strongly reinforced, so that the housing 300 does not expand and deform due to the internal pressure P. Similarly, in the fuse 500, since the reinforcing part 360 formed by connecting and fixing the upper and lower detaching parts 160 and detaching parts 260 is connected to the wall part, the housing 300 is strongly reinforced, so that the housing 300 does not expand and deform due to the internal pressure P.

[0054] It should be pointed out that Figure 8 and Fig. 9In the fuse 500 shown, a reinforcing portion 350 approximately located at the center of the accommodation space 340 and a reinforcing portion 360 located at the side are provided, but the present invention is not limited thereto and may include only one of the reinforcing portion 350 and the reinforcing portion 360. By providing the reinforcing portion 350 away from the inner side surface 341 of the accommodation space 340, the weak portion of the accommodation space 340, i.e., the portion away from the inner side surface 341, can be reinforced by the reinforcing portion 350, thereby more effectively preventing the housing 300 from expanding and deforming due to the internal pressure P. In addition, Figure 8 and Fig. 9 The fuse 500 shown has three reinforcement parts (350, 360), but the present invention is not limited thereto, and any number of reinforcement parts may be provided, such as two or more than four reinforcement parts. Figure 8 and Fig. 9 In the fuse 500 shown, the reinforcement parts (350, 360) are configured as columns connecting the wall parts, but the present invention is not limited thereto, and each reinforcement part (350, 360) can connect any two wall parts of the housing 300. Figure 8 and Fig. 9 In the fuse 500 shown, the reinforcing parts (350, 360) are configured as a columnar shape connecting the wall parts, but the present invention is not limited thereto, and the reinforcing parts may also have any shape such as a wall shape that divides the accommodation space 340 of the housing 300 into two sides.

[0055] In addition, since the reinforcing portion 350 is configured to connect and pass through one shell split piece 100 and the other shell split piece 200, the shell split piece 100 and the shell split piece 200 can be effectively prevented from expanding in a direction away from each other due to the internal pressure P. It should be noted that the shell 300 is composed of two split parts (shell split piece 100, shell split piece 200), but the present invention is not limited thereto, and the shell 300 can be composed of one integrally molded part, or the shell 300 can be composed of three or more split parts.

[0056] In addition, the reinforcing portion 350 is formed by connecting and fixing two split portions (150, 250), but the present invention is not limited thereto, and the reinforcing portion 350 may be a column that passes through the accommodation space 340 and is integrally formed. In this case, an integrally formed reinforcing portion 350 is provided at a shell split piece 100 of the shell 300, and the front end of the reinforcing portion 350 is connected and fixed to another shell split piece 200 of the shell 300, so that the shell split piece 100 and the shell split piece 200 are firmly fixed. Similarly, the reinforcing portion 360 is formed by connecting and fixing two split portions (160, 260), but the present invention is not limited thereto, and the reinforcing portion 360 may be a column that passes through the accommodation space 340 and is integrally formed. In addition, the present invention is not limited to the case where an integrally formed reinforcing portion 350 is integrally formed with a shell split piece 100 of the shell 300, and the reinforcing portion 350 and the shell 300 may be formed as a single body. In this case, the reinforcement part 350 is fixed to the housing 300 so as to penetrate the accommodation space 340 , thereby reinforcing the housing 300 .

[0057] Furthermore, since the split parts (150, 250) constituting the reinforcing part 350 are respectively formed in the shell split pieces (100, 200), the split parts can be formed while the shell split pieces are formed by a conventional method of forming the shell split pieces (such as injection molding, etc.).

[0058] In addition, if Figure 8 and 9 As shown, each reinforcement part (350, 360) is provided to be spaced apart from the fuse part 420 so as not to contact the fuse part 420 of the fuse element 400. Therefore, each reinforcement part (350, 360) does not thermally and physically affect the fuse part 420, and the fusing characteristics of the fuse part 420 are stabilized.

[0059] In addition, if Fig. 9 As shown, the reinforcing portion 350 extends perpendicular to the extension direction of the fuse element 400, that is, parallel to the direction of the axis X connecting the two terminal portions 410. Therefore, the reinforcing portion 350 is not easily affected by the internal pressure P generated by the fuse portion 420 and the thermal influence, and the reinforcing portion 350 maintains the designed strength, and can more effectively prevent the housing 300 from expanding and deforming due to the internal pressure P. It should be noted that the reinforcing portion 350 extends perpendicular to the extension direction of the fuse element 400, that is, parallel to the direction of the axis X connecting the two terminal portions 410, but the present invention is not limited thereto, and the reinforcing portion can be extended to be inclined at any angle relative to the axis X. Compared with the case where the reinforcing portion 350 extends in a direction parallel to the axis X, the reinforcing portion 350 inclined at any angle relative to the axis X is not easily affected by the internal pressure P generated by the fuse portion 420 and the thermal influence.

[0060] It should be noted that the fuse of the present invention is not limited to the above-described embodiments, 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 the claims.

Claims

1. A fuse, characterized in that: The invention comprises: a fuse element having a fuse portion provided between a pair of terminal portions; and a housing accommodating the fuse element. The housing includes a wall portion, A reinforcing portion connected to the wall portion is provided at at least one location of the housing.

2. The fuse according to claim 1, characterized in that: The shell has a shell split piece and another shell split piece, The reinforcing portion is configured as the shell split piece that crosses both sides.

3. The fuse according to claim 2, characterized in that: The reinforcing portion includes a split portion and another split portion, The one splitting portion is arranged on the one shell splitting piece, and the other splitting portion is arranged on the other shell splitting piece. The one detachable portion and the other detachable portion are configured to be connected and fixed to each other.

4. The fuse according to claim 3, characterized in that: The front end of the one split portion and the front end of the other split portion are connected and fixed by fitting with each other.

5. The fuse according to claim 2, characterized in that: The reinforcement portion is arranged on the one shell split piece, The front end of the reinforcement portion is connected and fixed to the other shell split piece.

6. The fuse according to any one of claims 1 to 5, characterized in that: The reinforcement portion is away from the inner side surface of the accommodating space.

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