Fusible cut-out

Abstract

The fuse (1) of the present application includes a housing member (10) of a cuboid shape having a space surrounded by a bottom and side walls, a cover member (20) closing an upper opening of the housing member (10) and being in close contact with the housing member, a fusible body (30) disposed in the space, and a pair of terminals (40, 50) connected to both ends of the fusible body (30). The housing member (10) has a plurality of engaging protrusions (17) formed at the side wall (12) along the longitudinal direction and a plurality of engaging protrusions (18) formed at the side wall (13) opposite to the side wall (12). The cover member (20) has a plurality of engaging recesses (27) formed at a contact wall (22) in contact with the side wall (12) and fitted with each of the plurality of engaging protrusions (17), and a plurality of engaging recesses (28) formed at a contact wall (23) in contact with the side wall (13) and fitted with each of the plurality of engaging protrusions (18).

Description

Technical Field

[0001] This invention relates to fuses. Background Technology

[0002] In electronic devices, fuses are used to prevent circuit damage caused by overcurrent. A fuse has a fusible element that melts and interrupts the current when an abnormal current flows through a circuit in which the fuse is installed, thus preventing circuit damage.

[0003] The fusible element is disposed in a space surrounded by a shell component and a cover component. When the gas pressure in this space increases, the cover component may detach from the shell component, thus the cover component and the shell component are thermally bonded together.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 5782196 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] However, heat-sealing the cover and housing components increases the manufacturing process of the fuse. Therefore, there is a need for a fuse that can be easily assembled while maintaining its breaking performance.

[0009] Therefore, the present invention was made in view of these problems, and the object of the present invention is to provide a fuse that combines cutting performance and assembly.

[0010] means for solving problems

[0011] In one embodiment of the present invention, a fuse is provided, characterized in that it comprises: a cuboid-shaped housing component having a space surrounded by a bottom and sidewalls; a cover component that closes the upper opening of the housing component and is in close contact with the housing component; a fusible element disposed in the space; and a pair of terminals connected to both ends of the fusible element, with the front ends of the pair of terminals exposed to the outside. The housing component has a plurality of first protrusions and a plurality of second protrusions, the plurality of first protrusions being formed on a first sidewall along a longitudinal direction, and the plurality of second protrusions being formed on a second sidewall opposite to the first sidewall. The cover component has a plurality of first recesses and a plurality of second recesses, the plurality of first recesses being formed on a first contact wall contacting the first sidewall and engaging with each of the plurality of first protrusions, and the plurality of second recesses being formed on a second contact wall contacting the second sidewall and engaging with each of the plurality of second protrusions.

[0012] In addition, the first contact wall may also cover the entire first sidewall and contact the first sidewall surface, and the second contact wall may also cover the entire second sidewall and contact the second sidewall surface.

[0013] Furthermore, the first protrusion may also be formed on both ends of the longitudinal direction and the bottom side of the first sidewall, and the second protrusion may also be formed on both ends of the longitudinal direction and the bottom side of the second sidewall.

[0014] In addition, the first recess can also be a through hole that penetrates the first contact wall, and the second recess can also be a through hole that penetrates the second contact wall.

[0015] Furthermore, the first protrusion may also have an inclined portion whose height increases toward the bottom, and the second protrusion may also have an inclined portion whose height increases toward the bottom.

[0016] In addition, the housing component may also be made of phenolic resin or unsaturated polyester resin, and the cover component may also be made of phenolic resin.

[0017] Furthermore, the first contact wall and the second contact wall may also be walls formed by bending the flat plate portion that closes the upper opening of the cover component, and the housing component may also have a third side wall and a fourth side wall orthogonal to the first side wall and the second side wall, and the terminal may also be clamped between the upper surface of the third side wall and the fourth side wall and the flat plate portion.

[0018] In addition, an arc-quenching agent may be provided around the fusible body in the space, and an adhesive may be applied to the portion of the plate portion where the terminal is held by the third sidewall and the fourth sidewall.

[0019] In addition, an arc-quenching agent may be disposed around the fusible body in the space, and the fuse may also include a thin film component disposed between the flat plate portion and the third and fourth sidewalls.

[0020] Furthermore, the rectangular fusible body may also have a plurality of narrow sections formed at predetermined intervals in the longitudinal direction, and an insulating adhesive may also be applied to the portion of the fusible body outside the narrow sections.

[0021] Furthermore, the fusible element and the terminal can also be integrally formed.

[0022] The effects of the invention

[0023] According to the present invention, a fuse can achieve both cutting performance and assembly capability. Attached Figure Description

[0024] Figure 1 This is a perspective view showing the fuse 1 according to the first embodiment.

[0025] Figure 2 This is an exploded perspective view of the fuse 1 according to the first embodiment.

[0026] Figure 3 This is an internal structural diagram of the fuse 1 according to the first embodiment.

[0027] Figure 4 This is a top view of housing component 10.

[0028] Figure 5 This is a side view of housing component 10.

[0029] Figure 6 This is a diagram used to illustrate the structure of the cover component 20.

[0030] Figure 7 This is a schematic diagram illustrating the process of mounting the cover component 20 onto the housing component 10.

[0031] Figure 8 This is a diagram used to illustrate the relationship between the resin constituting the housing component 10 and the cover component 20 and the assemblability.

[0032] Figure 9 This is a diagram illustrating the relationship between the resin constituting the housing component 10 and the cover component 20 and its cutting performance.

[0033] Figure 10 This is a diagram illustrating the structure of the fuse 1 according to the second embodiment.

[0034] Figure 11 This is a diagram illustrating the structure of the fuse 1 according to the third embodiment.

[0035] Figure 12 This is a diagram illustrating the structure of the fuse 1 according to the fourth embodiment. Detailed Implementation

[0036] <First Implementation Method>

[0037] (Structure of a fuse)

[0038] Reference Figures 1 to 3 The structure of the fuse according to the first embodiment will be described.

[0039] Figure 1 This is a perspective view showing the fuse 1 according to the first embodiment. Figure 2 This is an exploded perspective view of the fuse 1 according to the first embodiment. Figure 3 This is an internal structural diagram of the fuse 1 according to the first embodiment. Additionally, Figure 3 The fuse 1 shown is used to... Figure 1 and Figure 2 The fuse 1 shown is displayed upside down.

[0040] Fuse 1 is mounted on the circuit board of electronic equipment, etc., and melts when an abnormal current flows through the circuit. Fuse 1 is a miniature fuse; for example, its height is 11mm, its width is 11mm, and its length is 40mm or less. Furthermore, fuse 1 has a rated voltage of DC 500V and a rated current of 50A or less. Figure 2 As shown, the fuse 1 has a housing component 10, a cover component 20, a fusible element 30, and a pair of terminals 40 and 50.

[0041] like Figure 2 As shown, the housing component 10 is a cuboid shape with an opening at the top. Figure 3 As shown, a space 10a surrounded by a wall is formed in the housing component 10, and a fusible material 30 is disposed in the space 10a. The housing component 10 is made of resin, specifically, phenolic resin or unsaturated polyester resin.

[0042] Figure 4 This is a top view of housing component 10. Figure 5 This is a side view of housing component 10.

[0043] The housing component 10 has a bottom 11, four side walls 12, 13, 14, and 15, a pin 16, engaging protrusions 17 and 18, and a corner recess 19. Side wall 12 corresponds to the first side wall, side wall 13 corresponds to the second side wall, side wall 14 corresponds to the third side wall, and side wall 15 corresponds to the fourth side wall. Furthermore, engaging protrusion 17 corresponds to the first protrusion, and engaging protrusion 18 corresponds to the second protrusion.

[0044] The bottom 11 is rectangular. The side walls 12, 13, 14, and 15 are formed to stand upright from the four sides of the bottom 11. The side walls 12, 13, 14, 15 and the bottom 11 enclose the space 10a.

[0045] like Figure 2 As shown, sidewalls 12 and 13 are walls along the longitudinal direction of the housing component 10. Sidewall 13 is opposite to sidewall 12. The upper surface 12a of sidewall 12 ( Figure 4 ) and the upper surface 13a of the sidewall 13 Figure 4 It contacts the cover component 20.

[0046] Side walls 14 and 15 are transverse walls along the housing component 10. That is, side walls 14 and 15 are orthogonal to side walls 12 and 13. Figure 3 As shown, the upper surface 14a of sidewall 14 contacts terminal 40, and the upper surface 15a of sidewall 15 contacts terminal 50. Figure 5 As shown, the upper surfaces 14a and 15a are at the same height, but are lower than the upper surfaces 12a of the sidewall 12 and 13a of the sidewall 13 by the thickness of terminals 40 and 50.

[0047] Pin 16 is provided on the upper surface 14a of side wall 14 and the upper surface 15a of side wall 15. Pin 16 is a pin protruding from the center of the upper surfaces 14a and 15a. Figure 3 As shown, the pin 16 engages with the recess 24 of the cover member 20 when the terminals 40 and 50 are inserted.

[0048] The engaging protrusion 17 is a protrusion that engages with the cover component 20 to ensure a tight seal between the housing component 10 and the cover component 20. For example... Figure 4 As shown, a plurality of engaging protrusions 17 are formed on the sidewall 12. Specifically, the engaging protrusions 17 are formed on both ends of the longitudinal direction and on the bottom 11 side of the sidewall 12. However, it is not limited to this, the engaging protrusions 17 may also be formed in the center of the longitudinal direction and on the bottom 11 side. That is, three engaging protrusions 17 may also be formed on the sidewall 12.

[0049] like Figure 5 As shown, the engaging protrusion 17 has an inclined portion 17a. The inclined portion 17a is inclined such that its height increases towards the bottom 11. By providing such an inclined portion 17a, when the cover member 20 is mounted on the housing member 10, the sidewall of the cover member 20 flexes (widens) along the inclined portion 17a, thereby easily passing over the engaging protrusion 17. Therefore, it is easy to install the cover member 20, which is in close contact with the housing member 10.

[0050] Like the engaging protrusion 17, the engaging protrusion 18 engages with the cover component 20 to ensure a tight seal between the housing component 10 and the cover component 20. Figure 4 As shown, a plurality of engaging protrusions 18 are formed on the sidewall 13 opposite to the sidewall 12. Specifically, the engaging protrusions 18 are formed on both ends of the longitudinal direction and on the bottom 11 side of the sidewall 13. However, it is not limited to this, the engaging protrusions 18 may also be formed in the center of the longitudinal direction and on the bottom 11 side. That is, three engaging protrusions 18 may also be formed on the sidewall 13.

[0051] like Figure 5 As shown, the engaging protrusion 18 has an inclined portion 18a. The inclined portion 18a is inclined such that its height increases towards the bottom 11. By providing such an inclined portion 18a, when the cover member 20 is mounted on the housing member 10, the sidewall of the cover member 20 flexes (widens) along the inclined portion 18a, thereby easily passing over the engaging protrusion 18. Therefore, it is easy to install the cover member 20, which is in close contact with the housing member 10.

[0052] The corner recesses 19 are portions that recess the four corners of the housing component 10. That is, as shown... Figure 2As shown, the corner recess 19 is a portion that recesses the corners of the four sidewalls 12, 13, 14, and 15. The corner recess 19 has the function of positioning the cover member 20 relative to the housing member 10.

[0053] The cover component 20 is not fixed to the housing component 10 by welding or the like, but is detachably mounted on the housing component 10. For example... Figure 3 As shown, the cover component 20 closes the upper opening of the housing component 10. Furthermore, the cover component 20 is in close contact with the housing component 10. The cover component 20 is made of resin, specifically phenolic resin.

[0054] like Figure 2 As shown, the cover component 20 has a flat plate portion 21, two contact walls 22 and 23, a recessed portion 24, a limiting portion 25 and 26, and engaging recesses 27 and 28. Contact wall 22 corresponds to the first contact wall, contact wall 23 corresponds to the second contact wall, engaging recess 27 corresponds to the first recess, and engaging recess 28 corresponds to the second recess.

[0055] Figure 6 This is a diagram used to illustrate the structure of the cover component 20.

[0056] The flat plate 21 is rectangular in shape and closes the upper opening of the housing component 10. The flat plate 21 closes the upper opening of the housing component 10, thus making space 10a a sealed space. Figure 3 As shown, the plate portion 21 is separated from the fusible material 30 within the space 10a by a predetermined distance. Furthermore, the two ends of the plate portion 21, together with the housing component 10, hold the terminals 40 and 50.

[0057] The contact wall 22 is a wall formed by bending the flat plate portion 21 and contacts the side wall 12 of the housing component 10. The contact wall 22 has substantially the same dimensions as the side wall 12 and covers the entire side wall 12 (see reference). Figure 1 The contact wall 22 is in contact with the entire surface of the side wall 12. Thus, the contact wall 22 and the side wall 12 are in close contact.

[0058] The contact wall 23 is a wall formed by bending the flat plate portion 21 and contacts the side wall 13 of the housing component 10. The contact wall 23 has substantially the same dimensions as the side wall 13 and covers the entire side wall 13 (see reference). Figure 1 The contact wall 23 is in full contact with the side wall 13. Thus, the contact wall 23 and the side wall 13 are in close contact.

[0059] Two recesses 24 are provided at both ends of the longitudinal direction of the flat plate portion 21. The two recesses 24 engage with pins 16 located at both ends of the longitudinal direction of the housing component 10. The engagement of the recesses 24 with the pins 16 thereby positions the cover component 20 relative to the housing component 10.

[0060] The limiting parts 25 and 26 are portions that restrict the position of the cover member 20 when it is mounted on the housing member 10. That is, the limiting parts 25 and 26 are locked relative to the corner recess 19 of the housing member 10, thereby limiting longitudinal positional deviation during installation. The limiting part 25 is a wall connected to one longitudinal end of the contact walls 22 and 23, and the limiting part 26 is a wall connected to the other longitudinal end of the contact walls 22 and 23.

[0061] like Figure 1 As shown, the engaging recesses 27 and 28 are portions that engage with the engaging protrusions 17 and 18 of the housing component 10. Specifically, the engaging protrusion 17 is engaged in the engaging recess 27, and the engaging protrusion 18 is engaged in the engaging recess 28. The engaging recesses 27 and 28 engage with the engaging protrusions 17 and 18, thereby preventing the cover component 20 from falling off the housing component 10 even if the air pressure in the space 10a increases.

[0062] like Figure 2 As shown, a plurality of engaging recesses 27 are formed at the contact wall 22. The number of engaging recesses 27 is the same as the number of engaging protrusions 17, which is two in this case. The two engaging recesses 27 engage with the two engaging protrusions 17 respectively. The two engaging recesses 27 are formed at the two corners of the four corners of the contact wall 22 that are separated from the flat plate portion 21.

[0063] The engaging recess 27 is a through hole that passes through the contact wall 22. Specifically, the engaging recess 27 has a rectangular through hole. However, it is not limited to this; the engaging recess 27 may also have a depression, as long as it can engage with the engaging protrusion 17.

[0064] like Figure 2 As shown, a plurality of engaging recesses 28 are formed at the contact wall 23. The number of engaging recesses 28 is the same as the number of engaging protrusions 18, which is two in this case. The two engaging recesses 28 engage with the two engaging protrusions 18 respectively. The two engaging recesses 28 are formed at the two corners of the four corners of the contact wall 23 that are separated from the flat plate portion 21.

[0065] The engaging recess 28 is a through hole that passes through the contact wall 23. Specifically, the engaging recess 28 has a rectangular through hole. However, it is not limited to this; the engaging recess 28 may also have a depression, as long as it can engage with the engaging protrusion 18.

[0066] Figure 7 This is a schematic diagram illustrating the process of mounting the cover component 20 onto the housing component 10. Additionally, in Figure 7 For ease of explanation, the fusible element 30 and terminals 40 and 50 are omitted. Here, it is assumed that the cover component 20 is along... Figure 7The arrow shown in (a) is mounted on the housing component 10. For example... Figure 7 As shown in (b), when the cover member 20 is mounted on the housing member 10, the front ends of the contact walls 22, 23 of the cover member 20 contact the engaging protrusions 17, 18 of the housing member 10. When the cover member 20 is further moved relative to the housing member 10, the contact walls 22, 23... Figure 7 As shown in (c), the cover 20 flexes outwards while passing over the inclined portions 17a and 18a. Furthermore, when the cover member 20 is moved, the engaging protrusions 17 and 18 engage with the engaging recesses 27 and 28. Thus, the cover member 20 is installed in close contact with the housing member 10.

[0067] like Figure 2 As shown, the fusible element 30 is a plate-shaped fuse element. The fusible element 30 is disposed in the space 10a of the housing component 10. Specifically, the fusible element 30 is disposed in the space 10a in a state where it is supported by the terminals 40 and 50. The thickness of the fusible element 30 is less than the thickness of the terminals 40 and 50.

[0068] The fusible element 30 is connected to terminals 40 and 50. Specifically, one longitudinal end 32 of the fusible element 30 is connected to terminal 40, and the other longitudinal end 34 of the fusible element 30 is connected to terminal 50. The fusible element 30 is integrally formed with terminals 40 and 50. Therefore, the operation of joining the fusible element 30 to terminals 40 and 50 is eliminated, preventing poor connection. Furthermore, since there is no connection resistance, the resistance value of fuse 1 is stable.

[0069] like Figure 2 As shown, a plurality of holes 36 are formed at predetermined intervals on the fusible body 30. The holes 36 are elongated holes in this case, but are not limited thereto. For example, the holes 36 can also be perfect circles.

[0070] like Figure 2 As shown, terminals 40 and 50 are located on both sides of the fusible element 30. Terminals 40 and 50 are connected to both ends of the fusible element 30, and as shown... Figure 1 The front end shows a pair of terminals exposed to the outside. Terminals 40 and 50 are external terminals connected to the circuit board. Furthermore, as shown... Figure 3 As shown, terminal 40 is held by the upper surface 14a of the side wall 14 of housing member 10 and the flat plate portion 21 of cover member 20. Terminal 50 is held by the upper surface 15a of the side wall 15 of housing member 10 and the flat plate portion 21 of cover member 20.

[0071] Terminal 40 Figure 2The terminal 40 is bent into a stepped shape and has a connecting portion 42, a two-pronged portion 44, a clamping portion 46, and a through hole 48. The connecting portion 42 is located at one end of the terminal 40 and connects to one longitudinal end 32 of the fusible element 30. The two-pronged portion 44 is the portion that divides the other end (front end) of the terminal 40 into two prongs. The two-pronged portion 44 protrudes from the housing member 10 and connects to the circuit board. The clamping portion 46 is located at the center of the terminal 40 and is clamped by the housing member 10 and the cover member 20. Specifically, the clamping portion 46 is clamped by the upper surface 14a of the sidewall 14 and the flat plate portion 21. Figure 3 As shown, the through hole 48 is the portion through which the pin 16 of the housing component 10 is inserted. The pin 16 is inserted through the through hole 48, thereby positioning the fusible element 30 connected to the terminal 40 relative to the housing component 10.

[0072] like Figure 2 As shown, terminal 50 has a shape symmetrical to terminal 40 and includes a connecting portion 52, a forked portion 54, a clamping portion 56, and a through hole 58. The connecting portion 52 is located at one end of terminal 50 and connects to the other end 34 of the fusible element 30 in the longitudinal direction. The forked portion 54 is the portion that divides the other end (front end) of terminal 50 into two forks. The forked portion 54 protrudes from the housing member 10 and is connected to the circuit board. The clamping portion 56 is located at the center of terminal 50 and is clamped by the housing member 10 and the cover member 20. Specifically, the clamping portion 56 is clamped by the upper surface 15a of the sidewall 15 and the flat plate portion 21. Figure 3 As shown, the through hole 58 is the portion through which the pin 16 of the housing component 10 is inserted. The pin 16 is inserted through the through hole 58, thereby positioning the fusible element 30 connected to the terminal 50 relative to the housing component 10.

[0073] (Regarding the resin materials for the housing and cover components)

[0074] As described above, the housing component 10 is made of phenolic resin or unsaturated polyester resin, and the cover component 20 is made of phenolic resin. The selection of this resin is based on the evaluation results described below.

[0075] Figure 8 This diagram illustrates the relationship between the resins constituting the housing component 10 and the cover component 20 and their assemblability. Here, the assemblability is evaluated when the resins that are the main components of the housing component 10 and the cover component 20 are LCP (Liquid Crystal Polymer) resin, PPS (Poly Phenylene Sulfide) resin, phenolic resin, or unsaturated polyester resin.

[0076] Test sample A1 of the shell component 10 uses LCP resin as its main component. Test sample A2 uses PPS resin as its main component. Test sample A3 uses phenolic resin as its main component. Test sample A4 uses unsaturated polyester resin as its main component.

[0077] Experimental component B1 of the cover part 20 uses LCP resin as its main component. Experimental component B2 uses PPS resin as its main component. Experimental component B3 uses phenolic resin as its main component. Experimental component B4 uses unsaturated polyester resin as its main component.

[0078] like Figure 8 As shown, regarding the housing component 10, assembly is good in all cases of LCP resin, PPS resin, phenolic resin, and unsaturated polyester resin. On the other hand, regarding the cover component 20, assembly is good in the cases of LCP resin, PPS resin, and phenolic resin, but poor in the case of unsaturated polyester resin. This is because, in the case of unsaturated polyester resin, since it is a rigid material, thus... Figure 7 As shown in (c), it is difficult to widen the contact walls 22 and 23 of the cover member 20. On the other hand, in the case of LCP resin, PPS resin, and phenolic resin, the cover member 20 is easy to widen due to its toughness.

[0079] Figure 9 This is a diagram illustrating the relationship between the resins constituting the housing component 10 and the cover component 20 and their cutting performance. Here, the cutting performance was evaluated when the resins constituting the main components of the housing component 10 were LCP resin, PPS resin, phenolic resin, and unsaturated polyester resin, and when the resins constituting the main components of the cover component 20 were LCP resin, PPS resin, and phenolic resin. Investigative samples A1 to A4 and Investigative samples B1 to B3 were compared with... Figure 8 The experimental samples A1 to A4 shown are the same as those B1 to B3.

[0080] like Figure 9 As shown, when the housing component 10 is made of phenolic resin or unsaturated polyester resin and the cover component 20 is made of phenolic resin, the melt-forming performance of the melt 30 is good. On the other hand, when the resins of the housing component 10 and the cover component 20 are other combinations, the melt-forming performance of the melt 30 is poor.

[0081] In summary, in the housing component 10 and the cover component 20 that engage with the engagement protrusions 17, 18 and engagement recesses 27, 28, it is desirable that the housing component 10 is made of phenolic resin or unsaturated polyester resin, and the cover component 20 is made of phenolic resin, in order to have both assembly and cutting performance.

[0082] In the above description, it is assumed that the fusible element 30 is integrally formed with the terminals 40 and 50, but this is not a limitation. For example, the fusible element 30 can also be joined to the terminals 40 and 50 by welding (as an example, spot welding). That is, one end 32 of the fusible element 30 is welded to the connection portion 42 of the terminal 40, and the other end 34 of the fusible element 30 is welded to the connection portion 52 of the terminal 50. Instead of welding, brazing can also be used for joining.

[0083] (Effects of the first implementation method)

[0084] In the fuse 1 of the first embodiment, the housing component 10 has a plurality of engaging protrusions 17 and a plurality of engaging protrusions 18. The plurality of engaging protrusions 17 are formed on a side wall 12 along the longitudinal direction, and the plurality of engaging protrusions 18 are formed on a side wall 13 opposite to the side wall 12. Furthermore, the cover component 20, which is in close contact with the housing component 10, has a plurality of engaging recesses 27 and a plurality of engaging recesses 28. The plurality of engaging recesses 27 are formed on a contact wall 22 that contacts the side wall 12 and engage with the plurality of engaging protrusions 17 respectively. The plurality of engaging recesses 28 are formed on a contact wall 23 that contacts the side wall 13 and engage with the plurality of engaging protrusions 18 respectively.

[0085] Therefore, even if the air pressure in space 10a increases, the engaging protrusions 17 and 18 formed on the side walls 12 and 13 and the engaging recesses 27 and 28 formed on the contact walls 22 and 23 that contact the side walls 12 and 13 can remain locked, thus preventing the cover component 20 from falling off the housing component 10. In addition, since space 10a becomes a sealed space, it can also have the cutting properties of the fusible material 30.

[0086] <Second Implementation Method>

[0087] Reference Figure 10 The fuse 1 of the second embodiment will be described.

[0088] Figure 10 This is a diagram illustrating the structure of the fuse 1 according to the second embodiment. In the second embodiment, as... Figure 10 As shown, an arc-quenching agent 60 is disposed around the fusible material 30 within space 10a. The arc-quenching agent 60 is, for example, sand. By disposing of the arc-quenching agent 60, the generation of electric arc discharge can be suppressed.

[0089] Furthermore, in the second embodiment, to improve the airtightness of the space 10a, adhesive 65 is applied to both longitudinal ends of the flat plate portion 21 of the cover member 20. Adhesive 65 is applied to the portion of the flat plate portion 21 that holds the terminal 40 (specifically, the held portion 46) against the side wall 14 (specifically, the upper surface 4a). Additionally, adhesive 65 is applied to the portion of the flat plate portion 21 that holds the terminal 50 (specifically, the held portion 56) against the side wall 15 (specifically, the upper surface 15a). By applying adhesive 65 in this way, leakage of the arc-extinguishing agent 60 can be prevented.

[0090] In the fuse 1 of the second embodiment, the structure is the same as that of the fuse 1 of the first embodiment, except for the arc extinguishing agent 60 and the adhesive 65 described above. Therefore, the fuse 1 of the second embodiment can also prevent the cover member 20 from falling off the housing member 10.

[0091] <Third Implementation Method>

[0092] Reference Figure 11 The fuse 1 of the third embodiment will be described.

[0093] Figure 11 This is a diagram illustrating the structure of the fuse 1 according to the third embodiment. Similarly, in the third embodiment, as... Figure 11 As shown, an arc-quenching agent 60 is disposed around the fusible material 30 within space 10a. The arc-quenching agent 60 is, for example, sand.

[0094] Furthermore, in the third embodiment, to improve the airtightness of the space 10a, film members 68 are provided at both longitudinal ends of the flat plate portion 21 of the cover member 20. The film members 68 are disposed between the flat plate portion 21 and the sidewalls 14 and 15. By providing the film members 68, leakage of the arc quenching agent 60 can be prevented.

[0095] in addition, Figure 11 The thin film component 68 shown has the same width as the flat plate portion 21, but is not limited thereto. The thin film component 68 may also be provided only around the two recesses 24 in the flat plate portion 21. That is, the thin film component may be provided only in the portion between the side wall 14 and the flat plate portion 21, and in the portion between the side wall 15 and the flat plate portion 21.

[0096] In the fuse 1 of the third embodiment, the structure is the same as that of the fuse 1 of the first embodiment, except for the arc extinguishing agent 60 and the adhesive 65 described above. Therefore, the fuse 1 of the third embodiment can also prevent the cover member 20 from falling off the housing member 10.

[0097] <Fourth Implementation Method>

[0098] Reference Figure 12The fuse 1 of the fourth embodiment will be described.

[0099] Figure 12 This is a diagram illustrating the structure of the fuse 1 according to the fourth embodiment. In this fourth embodiment, the difference from the first to third embodiments described above is that an insulating adhesive 70 is applied to the fusible element 30.

[0100] like Figure 12 As shown, the rectangular fusible body 30 has a narrow portion 38. The narrow portion 38 is located on both sides of the orifice 36 in the transverse direction of the fusible body 30. Since the orifices 36 are formed at predetermined intervals in the longitudinal direction of the fusible body 30, the narrow portions 38 are also formed at predetermined intervals in the longitudinal direction. The width of the narrow portion 38 is smaller than the width of the portion between adjacent orifices 36 in the fusible body 30.

[0101] Furthermore, in the fourth embodiment, an insulating adhesive 70 is applied to multiple locations of the fusible body 30. The adhesive 70 is applied to portions of the fusible body 30 other than the narrow portions 38. Specifically, the adhesive 70 is applied to the portions between adjacent holes 36 in the fusible body 30. Figure 12 The area marked with a shaded line. Additionally, the portion coated with adhesive 70 can also be... Figure 12 A portion of the area marked with a shaded line. Additionally, in... Figure 12 In this process, adhesive 70 is applied to the upper surface of the fusible material 30, but is not limited thereto; it may also be applied to the lower surface of the fusible material 30. The insulating adhesive 70 applied to the fusible material 30 can improve the cutting performance of the fusible material 30.

[0102] Furthermore, in the above description, the narrow portion 38 is formed by having a hole 36 in the fusible body 30, but it is not limited to this. For example, the narrow portion 38 can also be formed by providing cuts at both ends of the fusible body 30 in the transverse direction. In this case, the narrow portion 38 is located on the central side of the fusible body 30 in the transverse direction.

[0103] Furthermore, in the above description, a hole 36 is formed in the transverse direction of the fusible body 30, but this is not a limitation. For example, multiple holes 36 may be formed in the transverse direction of the fusible body 30. In this case, three or more narrow portions 38 are formed in the transverse direction.

[0104] In the fuse 1 of the fourth embodiment, the structure other than the adhesive 70 is the same as that of the fuse 1 of the first to third embodiments. Therefore, the fuse 1 of the fourth embodiment can also prevent the cover member 20 from falling off the housing member 10.

[0105] In the fourth embodiment, it is assumed that a narrow portion 38 is formed at the fusible body 30, but it is not limited thereto; the narrow portion 38 may not be formed at the fusible body 30. By also coating the fusible body 30 with adhesive 70, the cutting performance of the fusible body 30 can be improved.

[0106] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and alterations can be made within its scope. For example, all or part of the device can be functionally or physically distributed / integrated in any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of new embodiments resulting from combinations are the same as the effects of the original embodiments.

[0107] Explanation of reference numerals in the attached figures

[0108] 1. Fuse

[0109] 10. Housing components

[0110] 10a space

[0111] Side walls 12 and 13

[0112] 17, 18. Clamping protrusions

[0113] Inclined sections 17a and 18a

[0114] 20 Cover components

[0115] 22, 23 Contact walls

[0116] 27, 28 engagement recess

[0117] 30 fusible fluid

[0118] 38 Narrow section

[0119] 40, 50 terminals

[0120] 60 Arc-quenching agent

[0121] 65 Adhesives

[0122] 68 Thin Film Components

[0123] 70 Adhesive.

Claims

1. A fuse, characterized in that, include: A rectangular shell component with a space enclosed by a bottom and side walls; A cover component that closes the upper opening of the housing component and is in close contact with the housing component; A fusible material disposed in the space; as well as A pair of terminals are connected to both ends of the fusible element, with the front ends of the pair of terminals exposed to the outside. The housing component has a plurality of first protrusions and a plurality of second protrusions, the plurality of first protrusions being formed along a first sidewall in the longitudinal direction, and the plurality of second protrusions being formed along a second sidewall opposite to the first sidewall. The cover component has a plurality of first recesses and a plurality of second recesses. The plurality of first recesses are formed at a first contact wall that contacts the first sidewall and engage with each of the plurality of first protrusions. The plurality of second recesses are formed at a second contact wall that contacts the second sidewall and engage with each of the plurality of second protrusions. When the cover component is installed onto the housing component, the front ends of the first contact wall and the second contact wall of the cover component contact the first protrusion and the second protrusion and flex outward. The housing component has four corner recesses formed by recessing the four corners of the housing component. The cover component has four limiting parts, which are respectively disposed at both ends of the first contact wall and the second contact wall and can engage with the corner recesses. When the cover is flexed and installed into the housing component, the limiting parts are guided by the corner recesses and limit the positional deviation of the first contact wall and the second contact wall in the longitudinal direction.

2. The fuse according to claim 1, characterized in that, The first contact wall covers the entire first sidewall and is in contact with the surface of the first sidewall. The second contact wall covers the entirety of the second sidewall and is in contact with the surface of the second sidewall.

3. The fuse according to claim 1, characterized in that, The first protrusion is formed on both ends of the longitudinal direction and on the bottom side of the first sidewall. The second protrusion is formed on both ends of the longitudinal direction and on the bottom side of the second sidewall.

4. The fuse according to claim 1, characterized in that, The first recess is a through hole that passes through the first contact wall. The second recess is a through hole that penetrates the second contact wall.

5. The fuse according to claim 1, characterized in that, The first protrusion has an inclined portion whose height increases towards the bottom. The second protrusion has an inclined portion whose height increases toward the bottom.

6. The fuse according to claim 1, characterized in that, The housing component is made of phenolic resin or unsaturated polyester resin. The cover component is made of phenolic resin.

7. The fuse according to claim 1, characterized in that, The first contact wall and the second contact wall are formed by bending the flat plate portion of the cover component that closes the upper opening. The housing component has a third sidewall and a fourth sidewall orthogonal to the first sidewall and the second sidewall. The terminal is held between the upper surfaces of the third and fourth sidewalls and the plate portion.

8. The fuse according to claim 7, characterized in that, An arc-quenching agent is placed around the fusible body within the space. An adhesive is applied to the portion of the plate portion where the terminal is held by the third and fourth sidewalls.

9. The fuse according to claim 7, characterized in that, An arc-quenching agent is placed around the fusible body within the space. The fuse also includes a thin-film component disposed between the flat plate portion and the third and fourth sidewalls.

10. The fuse according to claim 1, characterized in that, The rectangular fusible body has a plurality of narrow portions formed at predetermined intervals in the longitudinal direction. An insulating adhesive is applied to the portion of the fusible material other than the narrow portion.

11. The fuse according to claim 1, characterized in that, The fusible element and the terminal are integrally formed.

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