Stationary fuse element for a fuse and fuse having the same

Abstract

The utility model relates to a fixed type fuse body for fuse and fuse with the fixed type fuse body, the fixed type fuse body includes: the fusible part is configured as the sheet structure of extending along the transverse direction, the fusible part includes a plurality of interval distribution cross section reducing parts and the bridging portion between each adjacent cross section reducing part along the transverse direction, the support piece is configured as the sheet structure of extending along the transverse direction with the same orientation as the fusible part orientation, the support piece is fixedly connected to one vertical side of the fusible part to support all cross section reducing parts and bridging portion, and the support piece is provided with a plurality of hollow parts arranged respectively with a plurality of cross section reducing parts. The utility model improves the mechanical strength while improving the ability of breaking overload current, and the arc extinguishing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection device technology, and in particular to a fixed fuse element for a fuse and a fuse having the fixed fuse element. Background Technology

[0002] With the acceleration of the global energy transition, industries such as energy storage systems and electric vehicles in the field of new energy technology have developed rapidly. The importance of fuses for overload and short-circuit protection has become increasingly prominent. Conventional fuses are typically used to interrupt large-scale short-circuit currents in relatively stable installation environments. However, equipment in the new energy technology field needs to withstand mechanical shocks and vibrations for extended periods and frequently experiences small-scale overload faults. This leads to a risk of delayed protection or failure of conventional fuses when applied to new energy equipment, which in turn affects the safe and reliable operation of the equipment.

[0003] To improve the overload protection sensitivity of conventional fuses, existing technologies attempt to reduce the rated current of the fuse element by decreasing its cross-sectional area. However, this also reduces the mechanical strength of the fuse element, which obviously makes it easy for the fuse element to be damaged or even broken during both the manufacturing process and normal use. This would greatly reduce the reliability and safety of the fuse.

[0004] Therefore, there is a demand in this field for fuses with strong breaking capacity and mechanical strength, as well as wide applicability. Utility Model Content

[0005] The present invention aims to provide a fixed fusible element for fuses that can at least solve some of the problems mentioned above.

[0006] This invention also aims to provide a fuse with a fixed fusible element that utilizes the above-described improvements.

[0007] According to one aspect of the present invention, a fixed fusible element for a fuse is provided, the fixed fusible element comprising: a fusible member having a sheet-like structure extending laterally, the fusible member having a plurality of spaced-apart reduced cross-section portions and bridging portions located between adjacent reduced cross-section portions; and a support member having a sheet-like structure extending laterally in the same orientation as the fusible member, the support member being fixedly connected to one of the vertical sides of the fusible member to support all of the reduced cross-section portions and the bridging portions, and the support member having a plurality of hollow portions respectively arranged opposite to the plurality of reduced cross-section portions.

[0008] Compared with existing technologies, the fixed fusible element provided by this invention improves mechanical strength while ensuring the fusible element can interrupt overload current by arranging a sheet-like support member on the thickness side of the fusible element, thus making it suitable for new energy equipment. Furthermore, the support member has a hollowed-out portion opposite to the reduced cross-section of the fusible element. This improves the mechanical strength of the fusible element while ensuring that the arc generated when a fault current passes through the reduced cross-section is quickly extinguished by the arc-extinguishing medium inside the fuse, thereby improving the reliability of the applicable fuse.

[0009] Preferably, the thickness of the support member is greater than the thickness of the fusible member.

[0010] Preferably, the fusible element is made of a metallic material, and the support element is made of a non-metallic material with embedded metallic material, so that the support element can be welded to the fusible element.

[0011] Preferably, the longitudinal ends of the support extend beyond the corresponding longitudinal ends of the fusible element.

[0012] Preferably, the periphery of the hollowed-out portion is designed to surround the periphery of the corresponding reduced cross-section portion.

[0013] Preferably, the support member is fixedly connected to the bridging portion of the fusible element.

[0014] Preferably, the fusible element further includes extensions located on both sides of the cross-section reduction portion at the farthest lateral side and extending beyond the lateral ends of the support member, and mounting portions extending obliquely relative to the extensions.

[0015] According to another aspect of the present invention, a fuse is also provided, the fuse comprising the aforementioned fixed fusible element.

[0016] Preferably, the fuse further includes a tube extending laterally to house the fixed fusible element, a pair of terminals respectively connected to the two laterally ends of the tube to connect to the corresponding laterally ends of the fixed fusible element, and an arc-extinguishing medium filled into the tube to cover the fixed fusible element.

[0017] Preferably, the terminal block includes an inner cap that is interference-fitted to the corresponding lateral end of the tube body and connected to the corresponding lateral end of the fusible part of the fixed molten metal, and an outer cap that is interference-fitted to the inner cap and connected to an external circuit.

[0018] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a cross-sectional view of a fuse according to an embodiment of the present invention;

[0021] Figure 2 This is a side view of the fixed fuse element of a fuse according to an embodiment of the present invention;

[0022] Figure 3 This is a top view of the fixed fuse element of a fuse according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100-Fuse; 10-Fixed fusible element; 11-Fuseable component; 111-Reduced cross-section section; 111a-First reduced cross-section section; 111b-Second reduced cross-section section; 112-Bridging section; 112a-First bridging section; 112b-Second bridging section; 113-Extension section; 114-Mounting section; 12-Support member; 121-Hollowed section; 20-Tube body; 30-Arc extinguishing medium; 40-Terminal; 41-Inner cap; 42-Outer cap. Detailed Implementation

[0025] The schematic scheme of the fuse and its fixed fuse element disclosed in this utility model is now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0026] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0027] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0028] The terms "joining", "connection" and similar terms used in this utility model include both indirect connection of two components with the aid of an intermediate layer such as an adhesive or welding agent or an intermediate component such as a connector or transition piece, and direct connection of two components without the aid of any intermediate layer such as an adhesive or welding agent or an intermediate component such as a connector or transition piece.

[0029] Figures 1 to 3 The present invention's fuse 100 is illustrated by way of example. It exhibits good performance in interrupting small-multiple overload currents and possesses high mechanical strength, thereby improving its applicability, reliability, and service life. It should be noted that the term "lateral" as used herein refers to the appendix. Figure 1 The left and right directions in the middle, the vertical direction is attached. Figure 1 Page inward and outward orientation and attachments Figure 3 The vertical direction and the "vertical" direction are attached. Figure 1 The up and down directions in the middle.

[0030] like Figure 1 As shown, the fuse 100 may include a fixed fuse element 10, a tube 20, an arc-extinguishing medium 30, and a pair of terminals 40. The tube 20 may be designed as a cylindrical structure extending laterally and having an internal mounting cavity. The fixed fuse element 10 may be housed within the mounting cavity of the tube 20 and also extend laterally. The pair of terminals 40 are respectively mounted to the two laterally opposite ends of the tube 20 and connected to the two laterally opposite ends of the fixed fuse element 10, so as to connect the fixed fuse element 10 in series to an external circuit while enclosing it within the mounting cavity of the tube 20, thereby providing short-circuit and overload protection for the external circuit. The arc-extinguishing medium 30, such as silica sand, may fill the mounting cavity inside the tube 20 to cover the fixed fuse element 10 within the tube 20, thereby assisting in arc extinguishing when the fixed fuse element 10 melts due to a fault current.

[0031] Combination Figure 2 and Figure 3 As shown, the fixed melt 10 may include a fusible element 11 and a support 12. The fusible element 11 may be designed as a sheet structure made of conductive material and extending laterally. The support 12 is also constructed as a sheet structure and extends laterally in the same orientation as the fusible element 11. That is, both the fusible element 11 and the support 12 are arranged to extend laterally in the length direction, longitudinally in the width direction, and vertically in the thickness direction. This allows the long and wide surfaces of the support 12 to abut against the long and wide surfaces of the fusible element 11, so that there is as large a contact area as possible between the support 12 and the fusible element 11.

[0032] Furthermore, the fusible element 11 may include a plurality of spaced-apart reduced-section portions 111 and bridging portions 112 located between adjacent reduced-section portions 111 along the transverse direction, i.e., the length direction. The reduced-section portions 111 may be formed by punching holes in the substrate and have a smaller cross-sectional area than the bridging portions 112, thereby melting before the bridging portions 112 when subjected to fault current, especially overload current. The support member 12 may be fixedly connected to one of the vertical sides of the fusible element 11, such as the long and wide lower surface, to support the fusible element 11, especially all the reduced-section portions 111 and the bridging portions 112, thereby enhancing its mechanical strength. This prevents damage to the fusible element 11 caused by pulling during the assembly of the fixed fusible element 10 and also prevents the fusible element 11 from accidentally breaking due to mechanical impact and vibration during use.

[0033] The support member 12 may also be provided with a plurality of hollowed-out portions 121 arranged opposite to the plurality of cross-section reduction portions 111. This allows the arc-extinguishing medium 30 in the tube body 20 to pass through the corresponding hollowed-out portions 121 and cover each cross-section reduction portion 111. This improves the mechanical strength of the fusible part 11 and helps to extinguish the arc when each cross-section reduction portion 111 melts. This can further improve the safety and reliability of the fixed melt 10 provided by this utility model.

[0034] Optionally, in the illustrated embodiment, the support member 12 may be designed as a sheet structure with a thickness greater than that of the fusible element 11, so that after the support member 12 is fixedly connected to the fusible element 11, the assembled fusible element 11 and the support member 12 can be easily assembled, for example, placed inside the tube body 20, and the mechanical strength of the fusible element 11 can be better improved.

[0035] Optionally, the fusible element 11 may be made of a metallic material such as silver or copper, while the support element 12 may be made of a non-metallic material such as fiberglass board, nylon, or ceramic with embedded metallic material such as copper. The non-metallic material of the support element 12 can provide the main support function, and the embedded metallic material can enable the support element 12 to be welded to the fusible element 11, for example, by soldering or laser welding, thereby achieving a fixed connection between the support element 12 and the fusible element 11. In an alternative embodiment, the support element 12 may be made directly of a non-metallic material and fixedly connected to the fusible element 11 by means of additional fasteners.

[0036] Optionally, in the illustrated embodiment, the longitudinal ends of the support member 12 can extend beyond the corresponding ends of the fusible member 11 in the longitudinal direction. That is, the center line of the support member 12 extending laterally can be aligned with the center line of the fusible member 11 extending laterally, and the width dimension of the support member 12 can be greater than the width dimension of the fusible member 11, thereby supporting all the cross-section reduction portions 111 and bridging portions 112 in the longitudinal direction.

[0037] Optionally, in the illustrated embodiment, the hollow portion 121 can be generally designed as an elongated shape. The three centrally located first cross-section reduction portions 111a of the seven cross-section reduction portions 111 shown in the illustration are formed by forming rectangular punches in the substrate, thus their longitudinal perimeters are generally straight. Additionally, the four transverse second cross-section reduction portions 111b are formed by forming circular punches in the substrate, thus their longitudinal perimeters are generally curved. Whether it is the first cross-section reduction portion 111a with a straight perimeter or the second cross-section reduction portion 111b with a curved edge, the perimeter of the corresponding hollow portion 121 is surrounded by the hollow portion 121 so that the arc-extinguishing medium 30 inside the tube 20 can fully cover the cross-section reduction portion 111 through the hollow portion 121.

[0038] Optionally, in the illustrated embodiment, the four central first bridging portions 112a of the six bridging portions 112 shown in the illustration have approximately equal lateral dimensions, while the two second bridging portions 112b on both sides of the lateral side have slightly larger lateral dimensions than the four central first bridging portions 112a, so that the support member 12 is fixed to the fusible member 11 by welding to the two second bridging portions 112b on both sides of the lateral side.

[0039] Optionally, in the illustrated embodiment, the fusible element 11 may further include a pair of extensions 113 and a pair of mounting portions 114. The pair of extensions 113 extend from the two furthest laterally reduced-section portions 111 of the seven illustrated reduced-section portions 111, extending away from the reduced-section portions 111 until they exceed the corresponding lateral ends of the support member 12. The width of the extensions 113 may be designed to be greater than the width of the bridging portion 112 and the reduced-section portion 111 but less than the width of the support member 12, to maximize the contact area between the support member 12 and the fusible element 11. The pair of mounting portions 114 may be arranged at the lateral ends of the corresponding extensions 113 away from the reduced-section portions 111 and extend obliquely relative to the extensions 113, preferably vertically, for connection to the corresponding terminals 40.

[0040] The terminal block 40 may include an inner cap 41 and an outer cap 42. The inner cap 41 is installed with an interference fit to the corresponding lateral end of the tube body 20 to close the tube body 20. The outer cap 42 may also be installed with an interference fit to the inner cap 41 and connected to an external circuit, which greatly simplifies the assembly steps of the fuse 100. Thus, a pair of extensions 113 of the fusible element 11 can extend through the corresponding inner cap 41 respectively, so that the corresponding mounting portion 114 can be bent relative to the extension 113 and abut against the lateral outer surface of the inner cap 41. In particular, the mounting portion 114 may be welded to the inner cap 41, for example by resistance welding or laser welding, and the outer cap 42 is then installed to the inner cap 41 to clamp the corresponding mounting portion 114 between the outer cap 42 and the inner cap 41, thereby forming a loop between the mounting portion 114 and the external circuit.

[0041] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0042] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A fixed fusible element for a fuse, characterized in that, The fixed melt (10) includes: The fusible element (11) is constructed as a sheet structure extending laterally. The fusible element (11) includes a plurality of spaced-apart cross-section reduction portions (111) and bridging portions (112) located between each adjacent cross-section reduction portion (111). The support member (12) is constructed as a sheet-like structure extending laterally in the same orientation as the fusible element (11). The support member (12) is fixedly connected to one of the vertical sides of the fusible element (11) to support all of the cross-section reduction portion (111) and the bridging portion (112). The support member (12) is provided with a plurality of hollow portions (121) arranged opposite to the plurality of cross-section reduction portions (111).

2. The fixed fusible element for a fuse according to claim 1, characterized in that, The thickness of the support (12) is greater than the thickness of the fusible element (11).

3. The fixed fusible element for a fuse according to claim 2, characterized in that, The fusible element (11) is made of a metallic material, and the support element (12) is made of a non-metallic material with a pre-embedded metallic material, so that the support element (12) can be welded to the fusible element (11).

4. The fixed fusible element for a fuse according to any one of claims 1 to 3, characterized in that, The longitudinal ends of the support (12) extend longitudinally beyond the corresponding longitudinal ends of the fusible element (11).

5. The fixed fusible element for a fuse according to any one of claims 1 to 3, characterized in that, The periphery of the hollowed-out portion (121) is designed to surround the periphery of the corresponding reduced cross-section portion (111).

6. The fixed fuse element for a fuse according to any one of claims 1 to 3, characterized in that, The support member (12) is fixedly connected to the bridging portion (112) of the fusible member (11).

7. The fixed fuse element for a fuse according to any one of claims 1 to 3, characterized in that, The fusible member (11) further includes extensions (113) on both sides of the cross-section reduction portion (111) located at the farthest side in the lateral direction and extending beyond the lateral ends of the support member (12), and mounting portions (114) extending obliquely relative to the extensions (113).

8. A fuse (100), characterized in that, The fuse (100) includes a fixed fuse element (10) according to any one of claims 1 to 7.

9. The fuse (100) according to claim 8, characterized in that, The fuse (100) further includes a tube (20) extending laterally to accommodate the fixed fuse (10), a pair of terminals (40) respectively connected to the two lateral ends of the tube (20) to connect to the corresponding lateral ends of the fixed fuse (10), and an arc-extinguishing medium (30) filled into the tube (20) to cover the fixed fuse (10).

10. The fuse (100) according to claim 9, characterized in that, The terminal block (40) includes an inner cap (41) that is connected to the corresponding lateral end of the tube body (20) in an interference fit and is connected to the corresponding lateral end of the fusible element (11) of the fixed melt (10), and an outer cap (42) that is connected to the inner cap (41) in an interference fit and is connected to an external circuit.

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