Anti-loose fuse for vehicle

Abstract

The utility model relates to an anti-loose vehicle fuse, which comprises a hollow tube body, a conductive plate, a cover plate and at least one fastener, and is constructed to be respectively fastened and connected into a connecting hole of the received conductive plate through a through hole of the cover plate and fastened and connected into a connecting hole of the hollow tube body buckled with the cover plate through the through hole of the cover plate; wherein the fastener and / or the connecting hole are / is provided with an anti-loosening layer which can prevent the fastening connection from loosening and is made of a falling-resistant material. Therefore, even if the fuse is subjected to impact external force of bumping and vibration during running of a new energy automobile or a high-speed rail for a long time, the adverse result that the fuse is damaged and fails can be remarkably avoided. In particular, the anti-loose vehicle fuse is very suitable for batch production and does not significantly increase manufacturing and assembling costs.

Description

Technical Field

[0001] The utility model relates to an anti-loosening type vehicle fuse, in particular to a fuse which is connected to prevent loosening by means of an anti-loosening fastener having an anti-loosening layer formed of an anti-loosening material and covered by a plastic material at least partially at its connection part. Background Art

[0002] A fuse is an electrical device that generates heat to melt its fuse element, disconnecting the circuit when the current exceeds a specified value. After the current exceeds the specified value for a period of time, the fuse generates heat to melt the fuse element, thereby disconnecting the circuit. Fuses are simple in structure and easy to use, making them widely used as protective devices in power systems, various electrical equipment, and household appliances.

[0003] At present, cars have become an indispensable means of transportation in people's lives, and new energy vehicles have also developed rapidly with the strong support of national policies. New energy vehicles usually operate under high-power electricity, so they pose huge challenges to the design of high-voltage distribution systems and the selection of high-voltage components. Current transportation vehicles such as new energy vehicles or high-speed trains usually install a large number of fuses in the high-voltage distribution box to protect the current load circuit, such as UEC, IEC, EPS, ABS, DC / DC, generators, etc. In the prior art, the fuse nut is often fixed directly on the conductive plate, and the wires and the conductive plate are clamped and the circuit is connected by connecting the bolts and the internal threads of the screw. Furthermore, the fuse in the fuse is usually connected to the conductive plate through an intermediate connector by mechanical fastening.

[0004] Traditional fuses are mostly suitable for installation in conditions with ample space, a single working environment, stable current and voltage loads, and no or little impact. Therefore, it is difficult for them to meet the requirements of electric vehicles, which have relatively compact internal installation space, are often subjected to repeated impact and vibration under high temperature and high humidity, and have real-time changes in current load. In short, traditional fuses are usually arranged in transportation vehicles such as new energy vehicles or high-speed trains through hard connections that are not conducive to vibration or shock protection. This is not conducive to the long-term reliability and working stability of the fuse. Specifically, when the front cover of the fuse is connected to the hollow tube of the fuse, or when the conductive plate (or contact blade) and the front cover of the fuse are fastened with screw connectors, especially after the fuse is fastened to the conductive plate via an intermediate connector, it may become loose or twisted due to factors such as vibration and shock during the use of the fuse, vibration and shock during transportation, and vibration and shock and mechanical shock during user use, causing the components to loosen, thereby affecting the stability of the overall structure of the product, the reliability of the product performance, and the service life of the product.

[0005] In this regard, the Chinese utility model patent with authorization announcement number CN205789836U teaches the use of a new mechanical structure to buffer and reduce the vibration transmission to the fuse through the elastic restoring force of the compression spring, and the compression spring applies an elastic reaction force in the opposite direction to the bolt and the conductive plate, so that the bolt and the conductive plate will not be displaced during vibration, thereby achieving a better fixation effect on the wire. The Chinese utility model patent with authorization announcement number CN208157350U provides a specially constructed locking device, which is fixedly connected by a horizontal plate arranged horizontally and a vertical plate arranged vertically. The vertical plate is detachably connected to the side wall of the conductive plate to prevent the bolt from loosening due to vibration. This technical solution can prevent the bolt from loosening due to vibration during use, thereby ensuring that the connection between the wire and the conductive plate is disconnected and ensuring the practicality of the fuse.

[0006] However, the aforementioned method of securing the fuse's conductive plate with a compression spring requires multiple additional components for securing the fuse. However, due to fatigue of the compression spring under long-term pressure, this fatigue can cause the fuse's conductive plate and other connecting components to loosen, affecting the stability and service life of the product's overall structure. While the special construction described later redesigns the shape of the lock, it still requires fasteners such as bolts to secure the fuse components. Threaded connections can also become loose due to thread wear during long-term contact operation, further affecting the structural stability and service life of the fuse product. Furthermore, the prior art method of mechanically fastening the fuse's melt to the conductive plate via an intermediate connector can also lead to instability of the melt during operation due to loosening of the fasteners. Furthermore, this connection and fastening method also makes the fuse structure more complex.

[0007] Therefore, there is a technical demand in the relevant technical field to provide a vehicle fuse with better long-term reliability and working stability in a simple and reliable manner to reduce or eliminate the problem that the fuse body has a greater risk of damage when it is in a strong vibration environment. Utility Model Content

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the above-mentioned known fuses, such as reduced product structural stability, reliability and service life due to loosening of fasteners under vibration impact, as well as the same defects caused by the addition of additional fastening components and the inability to avoid the use of traditional fasteners for connection, thereby providing a vehicle fuse with a special anti-loosening connection in a simple and feasible manner, which is anti-loosening by means of an anti-fall fastener having an anti-loosening layer formed of a fall-resistant material and covered at least partially at its connection part by a plastic material.

[0009] In order to solve the above technical problems, the utility model provides a kind of anti-loosening vehicle fuse, which comprises: a hollow tube body, which is constructed as a cylindrical body with a front end opening and a rear end opening arranged in opposite directions, and the peripheral part of the front end opening and the peripheral part of the rear end opening are respectively evenly provided with a plurality of connection holes; a plurality of conductive plates, which comprise a first conductive plate electrically connected to at least one fuse element of the fuse and a second conductive plate opposite thereto so as to allow the fuse to be electrically connected in series to a vehicle-mounted electrical device, and the first conductive plate and the second conductive plate are designed to be generally circular and have an indented concave portion in the middle thereof for arranging at least one connection hole; a plurality of cover plates, which comprise a first conductive plate electrically connected to the front end opening and the rear end opening of the hollow tube body The rear end openings are respectively matched with a first cover plate and a second cover plate, the first cover plate and the second cover plate each having an opening for the first conductive plate and the second conductive plate to pass through and being configured to be snapped together with the hollow tube body to form a closed chamber for accommodating the fuse element and the arc extinguishing medium of the fuse, and the cover plate has a through hole that can be aligned with the connection hole in the hollow tube body and the connection hole in the conductive plate; at least one fastener is configured to be fastened and connected into the connection hole of the received conductive plate through the through hole of the cover plate and to be fastened and connected into the connection hole of the hollow tube body snapped with the cover plate through the through hole of the cover plate; wherein the fastener and / or the connection hole are provided with an anti-loosening layer formed of a fall-resistant material that can prevent the fastened connection from loosening.

[0010] Therefore, unlike the prior art, the present invention provides a novel anti-loosening type vehicle fuse with an anti-loosening connection, which is anti-loosening by means of an anti-loosening fastener having an anti-loosening layer formed by an anti-loosening material covered by a plastic material at least partially at its connection part. This vehicle fuse with a novel anti-loosening connection overcomes the defects of the above-mentioned prior art in that the fuse fasteners become loose under vibration impact, which leads to reduced product structural stability, reliability and service life. Even when the fuse is subjected to and absorbed for a long time external impact forces such as new energy vehicles or high-speed rail bumps and vibrations, the anti-loosening connection can significantly avoid the adverse consequences of fuse damage and failure. In particular, this anti-loosening type vehicle fuse is very suitable for mass production and does not significantly increase manufacturing and assembly costs.

[0011] According to a preferred embodiment of the present invention, the fuse further includes a microswitch disposed on the top wall of the hollow tube and operatively connected to the first and second cover plates via a microswitch base. The microswitch further includes an indicator, an elastic member, and an indicator wire disposed therein, as well as at least one pair of electrical contacts disposed on its outer surface, wherein the indicator wire is electrically connected in parallel to the fuse element.

[0012] According to a preferred embodiment of the present invention, the fastener is a non-drop fastener with an anti-loosening layer formed of a non-drop material, wherein the non-drop fastener comprises at least a first non-drop screw and a second non-drop screw. The first non-drop screw is configured to be fastened and connected to the connection hole of the received conductive plate through the through hole of the cover plate, and the second non-drop screw is configured to be fastened and connected to the connection hole of the hollow tube body that is engaged with the cover plate through the through hole of the cover plate.

[0013] According to a preferred embodiment of the present invention, the connection holes arranged on each conductive plate, each cover plate and the hollow tube body are respectively countersunk holes with internal threads.

[0014] According to a preferred embodiment of the present invention, each of the anti-drop screws comprises at least a respective anti-drop screw head and a respective anti-drop screw shank. Each anti-drop screw shank has a threaded portion formed on its outer surface and includes a loosening layer formed of an anti-drop material and a guide portion. The loosening layer is provided spaced apart from the guide portion and the anti-drop screw head.

[0015] According to a preferred embodiment of the present invention, the longitudinal length of the anti-loosening layer formed of the anti-falling material of each anti-falling screw is in the range of 1 / 3 to 2 / 3 of the length of the rod of each anti-falling screw.

[0016] According to a preferred embodiment of the present invention, the anti-loosening layer of the screw formed of the anti-falling material substantially covers 65%-75% of the thread profile depth in the radial direction of the thread.

[0017] According to a preferred embodiment of the present invention, the anti-loosening layer of each anti-falling screw, which is formed of an anti-falling material, is constructed of Pre-cote 80.

[0018] According to a preferred embodiment of the present invention, the first anti-fall screw and the second anti-fall screw are both configured as cross-slot pan head anti-fall screws; wherein the first anti-fall screw has a GB818 M4 standard thread, and the second anti-fall screw has an ST4.2 self-tapping thread.

[0019] For ease of discussion, the fuses and the specific fasteners used therein will be discussed with reference to the reference numerals in the accompanying drawings. However, unless otherwise explicitly indicated, the drawings and detailed description should not be considered to limit the scope of the claims, and the utility model disclosed herein is also applicable to fuses of various sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated in and constitute a part of this specification, and illustrate embodiments consistent with the present invention. They are merely exemplary and explanatory and are not intended to limit the present invention.

[0021] Figure 1 This is a three-dimensional perspective view of the anti-loosening vehicle fuse according to the utility model;

[0022] Figure 2 yes Figure 1 A side view of a non-loosening automotive fuse is shown;

[0023] Figure 3 1 is a front view of a first anti-loosening screw having an anti-loosening layer formed of an anti-loosening material according to the present invention, which specifically shows the anti-loosening layer formed of the anti-loosening material located on the rod portion;

[0024] Figure 4 yes Figure 3 A perspective view of a first anti-fall screw having an anti-loosening layer formed of an anti-fall material is shown;

[0025] Figure 5 1 is a front view of a second anti-loosening screw having an anti-loosening layer formed of an anti-loosening material according to the present invention, which specifically shows the anti-loosening layer formed of the anti-loosening material located on the rod portion;

[0026] Figure 6 yes Figure 5 A perspective view of a second anti-fall screw having an anti-fall layer formed of an anti-fall material is shown.

[0027] Reference numerals

[0028] Automotive fuse 200; hollow tube 201 first conductive plate 202 second conductive plate 203 first cover plate 204 second cover plate 205 first anti-drop screw 210 first anti-drop screw head 211 first anti-drop screw rod

[0029] 212 Anti-loosening layer of the first anti-loosening screw 2121 First anti-loosening screw guide 2122 Second anti-loosening screw 220 Second anti-loosening screw head 221 Second anti-loosening screw rod 222 Anti-loosening layer of the second anti-loosening screw 2221 Second anti-loosening screw guide 2222 DETAILED DESCRIPTION

[0030] The present invention is described below in conjunction with the accompanying drawings. It should be understood that the embodiments listed below are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The accompanying drawings are provided to present multiple embodiments of the present invention, but the drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut away to better illustrate and explain the disclosure of the present invention. Some components in the accompanying drawings can be repositioned according to actual needs without affecting the technical effects. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0031] Certain directional terms used in the following description of the drawings, such as "inner," "outer," "upper," "lower," "top," "bottom," and other directional terms, will be understood to have their normal meanings and refer to those directions associated with normal viewing of the drawings. Unless otherwise indicated, the directional terms described in this specification are generally in accordance with conventional directions understood by those skilled in the art.

[0032] The terms "first," "first," "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. The expression "substantially" allows for a reasonable range of angular deviation and does not necessarily mean complete consistency.

[0033] Some embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Refer to the attached Figure 1 and attached Figure 2 As shown, in order to solve the above technical problems, the present invention provides a loose-proof vehicle fuse 200, which includes: a hollow tube body 201, multiple conductive plates, multiple cover plates 4 and at least one anti-drop fastener.

[0035] The hollow tube body 201 is constructed as a cylindrical body with a front opening and a rear opening arranged in opposite directions. Generally, the hollow tube body 201 is constructed as a cylindrical thin-walled intermediate member in the shape of a quadrangular prism made of an insulating material such as high-strength ceramic, and further forms a smooth surface transition at the junction of the two adjacent outer surfaces to facilitate access by operators. Furthermore, the front opening and the rear opening are constructed to the same size, and a plurality of first connection holes are evenly distributed in the outer peripheral portion near the front opening, and a plurality of second connection holes are evenly distributed in the outer peripheral portion near the rear opening for connection between fuse components. Preferably, the first connection holes and the second connection holes are close to the smooth transition portion of the two adjacent outer surfaces of the hollow tube body 201; more preferably, the connection holes are arranged in pairs near the smooth transition portion.

[0036] exist Figure 1 In the embodiment shown, the conductive plates include a first conductive plate 202 and a second conductive plate 203, which are made of metal and can be electrically connected to at least one fuse element of the fuse 200. Figure 1As shown, the first conductive plate 202 and the second conductive plate 203 are designed to be generally circular, with an inwardly concave portion formed in the middle of the circle, which has mounting holes for receiving a plurality of first anti-drop screws 210, described in detail below, which connect the first conductive plate 202 and the second conductive plate 203 to the first cover plate 204 and the second cover plate 205. This forms a rotation-stopping configuration for the first conductive plate 202 and the second conductive plate 203 relative to the first cover plate 204 and the second cover plate 205. Here, multiple melts connected in series are grouped according to the number of required sleeves for installation, for example, they can be divided into four groups. One end of each connecting edge of each group of melts is sequentially welded to one end of the first conductive plate 202, then passed through the hollow tube 201, and then the other end is sequentially welded to one end of the opposite second conductive plate 203. Attention is paid to ensuring uniform arrangement and firm welding.

[0037] In order to achieve connection with the external circuit of the new energy vehicle or high-speed rail, the first conductive plate 202 and the second conductive plate 203 are both provided with perforations for electrical connection. Preferably, the first conductive plate 202 and the second conductive plate 203 have the same configuration. More preferably, the first conductive plate 202 and the second conductive plate 203 are configured as interchangeable parts to meet the needs of mass production of fuses. The external electrical device can be connected in series with the fuse 200 by a first electrical connection line through the perforations provided on the first conductive plate 203 and a second electrical connection line through the perforations provided on the second conductive plate 203. When the current of the external electrical device exceeds the rated value for a period of time, the heat transferred in the series circuit melts the fuse enclosed in the hollow tube 201 of the fuse 200, thereby disconnecting the series circuit and thus achieving protection of the external electrical device.

[0038] To securely secure the first and second conductive plates 202, 203 relative to the hollow tube 201 and reliably encapsulate the fuse element within the hollow tube 201, a metal cover is provided for the fuse 200. In this embodiment, the cover of the fuse 200 comprises a first cover 204 and a second cover 205, which are form-fitted with the front and rear openings of the hollow tube 201, respectively. Similar to the design concept of the first and second conductive plates 202, 203 described above, they are also constructed as interchangeable components with the same configuration and dimensions, facilitating easy access during installation and reducing the risk of misoperation. To this end, the first and second cover plates 204, 205, snap together with the hollow tube 201 to form a sealed chamber for accommodating the fuse element and arc-extinguishing medium of the fuse 200, thereby limiting the risk of overcurrent to the protected external electrical device to the limited area of ​​the fuse 200 itself.

[0039] Furthermore, the first cover plate 204 and the second cover plate 205 each have multiple through-holes evenly distributed on their outer circumferences that align with the connection holes of the hollow tube 201, and have through-holes in their central portions that generally align with the mounting holes of the indented portions in the circular central portions of the first and second conductive plates 202, 203. Here, the first and second cover plates 204, 205 are securely connected to the first and second conductive plates 202, 203 via the through-holes in their central portions that generally align with the mounting holes in the indented portions of the first and second conductive plates 202, 203. The first and second cover plates 204, 205 are securely connected to the hollow tube 201 via the multiple through-holes in their outer circumferences.

[0040] In order to achieve a secure connection between the first and second cover plates 204 and 205, the first and second conductive plates 202 and 203, and the hollow tube 201, the fuse 200 in this embodiment further includes at least one anti-drop fastener, or a plastic anti-drop layer formed of an anti-drop material is partially disposed at the connection portion of the anti-drop fastener and / or the connection hole of the hollow tube 201 or the mounting hole of the conductive plate. The anti-drop layer can prevent the secure connection from loosening. The first and second conductive plates 202 and 203, which are electrically connected to the fuse, can thus be securely secured to the corresponding first and second cover plates 204 and 205 via the corresponding plurality of connection holes by means of the at least one anti-drop fastener. The first and second cover plates 204 and 205 are then joined to the hollow tube 201 via the corresponding plurality of connection holes by means of the at least one anti-drop fastener, thereby forming an assembled fuse assembly.

[0041] In the embodiment described herein, the anti-drop fasteners may include at least a first anti-drop screw 210 and a second anti-drop screw 220. Each first anti-drop screw 210 is secured to the mounting hole of the circular, indented portion of the center portion of the received conductive plate through a through-hole in the first and second cover plates 204, 205. Furthermore, each second anti-drop screw 220 is secured to the connection hole of the hollow tube 201, which engages with the cover plates, through a through-hole in the first and second cover plates 204, 205. Specifically, the first anti-drop screw 210 is adapted to pass through a through-hole in the first cover plate 204 that is substantially aligned with the first conductive plate 202 connected to the melt, thereby securing the two, and through a through-hole in the second cover plate 205 that is substantially aligned with the second conductive plate 203, thereby securing the two. Furthermore, the second anti-drop screw 220 is adapted to secure the first and second cover plates 204, 205 to the multiple connection holes in the hollow tube 201, respectively. Preferably, the connection holes arranged on each conductive plate, each cover plate and the hollow tube body 201 are respectively constructed as countersunk holes with internal threads.

[0042] See the instructions attached Figure 3 and attached Figure 4 , the fastener is a resistant fastener with an anti-loosening layer formed of a resistant material. Specifically, the first resistant screw 210 includes at least a first resistant screw head 211 and a first resistant screw shank 212. The first resistant screw shank 212 extends downward from the bottom of the first resistant screw head 211 and forms a thread portion on its outer surface, wherein the first resistant screw shank 212 includes at least an anti-loosening layer 2121 formed of a resistant material and a first resistant screw guide 2122. Furthermore, the first resistant screw shank 212 is provided with an anti-loosening layer 2121 formed of a resistant material at a position close to the first resistant screw guide 2122 and spaced apart from the first resistant screw head 211. Preferably, the first anti-loosening screw used to achieve a fastening and anti-loosening connection between the cover plate 204 and the conductive plate 202 is composed of an anti-loosening layer 2121 formed of an anti-loosening material and is provided with a GB818 M4 standard thread. This is because both the cover plate 204 and the conductive plate 202 are thin plate-like components made of metal materials, and the use of standard threads helps operators to easily assemble the two.

[0043] See attached Figure 5 and attached Figure 6 The second anti-drop screw 220 includes at least a second anti-drop screw head 221 and a second anti-drop screw shank 222. The second anti-drop screw shank 222 extends downward from the bottom of the second anti-drop screw head 221 and has a threaded portion formed on its outer surface. The second anti-drop screw shank 222 includes at least a second anti-drop screw anti-loosening layer 2221 formed of an anti-drop material and a second anti-drop screw guide 2212. Furthermore, the second anti-drop screw shank 222 is provided with a second anti-drop screw anti-loosening layer 2221 formed of an anti-drop material in a portion proximal to the second anti-drop screw guide 2222 and spaced apart from the second anti-drop screw head 221. Preferably, the second anti-fall screw is provided with an anti-loosening layer 2221 formed by an anti-fall material and an ST4.2 self-tapping thread. This is because the cover plate 204 and the hollow tube body 201 are respectively made of metal and ceramic materials and the fastening connection here needs to mainly withstand and dissipate the vibration force from the outside. The use of self-tapping threads helps the operator to pre-tighten the anti-fall screw with a large tightening torque.

[0044] Preferably, the longitudinal lengths of the first and second anti-fall screws' anti-fall layer 2121, 2221, formed of a non-falling material, are within a range of 1 / 3 to 2 / 3 of the length of the first and second anti-fall screw shanks 212, 222, respectively. Furthermore, the first and second anti-fall screws' anti-fall layer 2121, 2221, formed of a non-falling material, cover approximately 65%-75% of the thread profile depth in the radial direction of the thread, preferably 75%. Thus, when the first and second anti-fall screws 210, 220, respectively, engage with the internal threads of the connection holes of the corresponding cover plate and hollow tube 201, the first and second anti-fall screws' anti-fall layer 2121, 2221, deform due to compression during the screw tightening and thread mating processes, thereby enhancing the overall stability of the threaded connection between the various components of the fuse 200.

[0045] Specifically, the anti-loosening layer 2121 of the first anti-loosening screw formed of an anti-loosening material and the anti-loosening layer 2221 of the second anti-loosening screw formed of an anti-loosening material are preferably made of resin material, and particularly preferably constructed of Pre-cote80.

[0046] On the contrary, those skilled in the art may also consider setting an anti-loosening layer structure formed by the anti-falling material according to the present invention in the internal threaded holes of each connection part, and using standard screws that do not have an anti-loosening layer formed by the anti-falling material to achieve the fastening connection between the various cover plates and the conductive plates of the fuse 200 and the hollow tube body 201. This embodiment can also effectively achieve the fastening connection between the various components of the fuse 200.

[0047] As can be seen from the above, unlike the prior art, the anti-loosening type automotive fuse in the present invention can be anti-loosening connected by means of an anti-loosening fastener having an anti-loosening layer formed by an anti-loosening material covered by a plastic material at least partially at its connection part. This automotive fuse with a novel anti-loosening connection overcomes the defects of the above prior art described in that the fuse fasteners loosen under vibration impact, which leads to reduced product structural stability, reliability and service life. Even when it withstands and absorbs external impact forces such as new energy vehicles or high-speed rail bumps and vibrations for a long time, the anti-loosening connection can significantly avoid the adverse consequences of fuse damage and failure. In particular, this anti-loosening type automotive fuse is very suitable for mass production and will not significantly increase manufacturing and assembly costs.

[0048] In a specific embodiment of the present invention, the fuse 200 further includes a micro switch. A micro switch base 207 may be mounted on the top wall of the hollow tube 201 of the fuse 200 to support the micro switch. Furthermore, the micro switch can be electrically connected to the fuse element contained within the hollow tube 201.

[0049] In a specific embodiment of the present invention, the maximum rated current of the fuse 200 is 2000 amperes. Those skilled in the art can configure the number of fuse elements according to the rated current of the application of the fuse 200, and the number of configured fuse elements is proportional to the rated current of the fuse 200.

[0050] Regarding the installation of the fuse described in the utility model, after technical personnel in this field set the number of fuses according to the rated current of the site, they can use welding to connect the two ends of each fuse to the end faces of the first conductive plate 202 and the second conductive plate 203 close to the hollow tube body 201, and insert the first conductive plate 202 and the second conductive plate 203 with the fuses into the opening of the first cover plate 204, the front end opening and the rear end opening of the hollow tube body 201, and the opening of the second cover plate 205 respectively. Furthermore, with the aid of the anti-fall fasteners in the form of the first anti-fall screw 210 and the second anti-fall screw 220 provided by the present invention, the anti-loosening connection between the first cover plate 204 and the hollow tube body 201, as well as between it and the first conductive plate 202 can be completed in sequence, and after the arc-extinguishing medium such as quartz sand is filled in the semi-closed shell formed, the anti-loosening connection between the second cover plate 205 and the second conductive plate 203, as well as between it and the hollow tube body 201 can be completed, thereby forming the main body of the fuse 200 according to the present invention.

[0051] Furthermore, a microswitch disposed on the top wall of the hollow tube 201 is mechanically connected to the lead-out portions of the first cover plate 204 and the second cover plate 205 via a microswitch base 207. The microswitch is sequentially provided with an indicator, an elastic member, and an indicator wire. One end of the indicator wire is connected to the side of the fuse closest to the first cover plate 204, while the other end is connected to the side of the fuse closest to the second cover plate 205, thereby forming a parallel connection between the microswitch and the fuse 200.

[0052] Furthermore, the micro switch also has at least one pair of terminals that can be connected to the control circuit to achieve switching between normally open and normally closed actions of the control circuit.

[0053] After fuse 200 is connected in series with an external electrical device via external electrical connection lines through the through-holes provided on its first conductive plate 202 and the through-holes provided on its second conductive plate 203, if the current in the external device exceeds the rated value for a period of time, the heat transferred in this series circuit will melt the fuse element enclosed in hollow tube 201 of fuse 200 and the indicator wire of the microswitch connected to the fuse element. As a result, the compressed elastic member within the microswitch returns to its normal state, causing the indicator within the microswitch to move upward. This movement transmits a fusing signal through the microswitch terminals to the control circuit, completing the switching between the normally open and normally closed operation of the control circuit and disconnecting the current in the fuse protection circuit, i.e., the series circuit between the fuse and the external electrical device, thereby achieving overcurrent protection.

[0054] Unless expressly excluded or otherwise limited, each document cited herein, including any cross-referenced or related patent or patent application and any patent application or patent to which this application claims priority or the benefit of which is hereby incorporated by reference in its entirety. The citation of any document is not an admission that it is prior art to any of the disclosed or claimed inventions herein, or that it, by itself or in combination with any one or more references, proposes, suggests, or discloses any such invention. In addition, when any meaning or definition of a term in this invention conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this invention shall prevail.

[0055] Although specific embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended that all such changes and modifications within the scope of the present invention be encompassed in the appended claims.

Claims

1. A loose-proof vehicle fuse (200), characterized in that: include, The hollow tube (201) is constructed as a cylindrical body having a front opening and a rear opening arranged in opposite directions, and the outer periphery of the front opening and the outer periphery of the rear opening are each evenly provided with a plurality of connection holes; A plurality of conductive plates, comprising a first conductive plate (202) electrically connected to at least one fuse element of a fuse (200) and a second conductive plate (203) opposite thereto, so as to allow the fuse (200) to be electrically connected in series to an on-board electrical device, wherein the first conductive plate (202) and the second conductive plate (203) are designed to be substantially circular and have an indented portion in the middle thereof for arranging at least one connection hole; A plurality of cover plates, comprising a first cover plate (204) and a second cover plate (205) respectively matched in shape with the front end opening and the rear end opening of the hollow tube (201); the first cover plate (204) and the second cover plate (205) each having an opening for the first conductive plate (202) and the second conductive plate (203) to pass through, and configured to be snapped together with the hollow tube (201) to form a closed chamber for accommodating the melt and arc extinguishing medium of the fuse (200); and the cover plates have through holes that can be aligned with the connection holes in the hollow tube (201) and the connection holes in the conductive plates; At least one fastener configured to be fastened and connected into the connection hole of the received conductive plate through the through hole of the cover plate and to be fastened and connected into the connection hole of the hollow tube engaged with the cover plate through the through hole of the cover plate; The fastener and / or the connection hole are provided with an anti-loosening layer formed of a fall-resistant material that can prevent the fastening connection from loosening.

2. The anti-loosening vehicle fuse (200) according to claim 1 is characterized in that: The fastener is a fall-resistant fastener with an anti-loosening layer formed of a fall-resistant material, wherein the fall-resistant fastener comprises at least a first fall-resistant screw (210) and a second fall-resistant screw (220); The first anti-fall screw (210) is constructed to be fastened and connected into the connection hole of the received conductive plate through the through hole of the cover plate, and the second anti-fall screw (220) is constructed to be fastened and connected into the connection hole of the hollow tube body that is engaged with the cover plate through the through hole of the cover plate, wherein the first anti-fall screw (210) is different from the second anti-fall screw (220).

3. The anti-loosening vehicle fuse (200) according to claim 1, characterized in that: The connection holes arranged on each conductive plate, each cover plate and the hollow tube (201) are respectively countersunk holes with internal threads.

4. The anti-loosening vehicle fuse (200) according to claim 2, characterized in that: Each anti-fall screw comprises at least a respective anti-fall screw head and a respective anti-fall screw shank, wherein each anti-fall screw shank has a thread portion formed on its outer surface and includes an anti-loosening layer and a guide portion formed of an anti-fall material; Wherein, an anti-loosening layer formed of an anti-falling material is arranged spaced apart from the guide portion and the anti-falling screw head.

5. The anti-loosening vehicle fuse (200) according to claim 4 is characterized in that: The longitudinal length of the anti-loosening layer formed of the anti-falling material of each anti-falling screw is respectively in the range of 1 / 3 to 2 / 3 of the length of the rod of each anti-falling screw.

6. The anti-loosening vehicle fuse (200) according to claim 4, characterized in that: The anti-loosening layer of the screw, formed of the anti-falling material, substantially covers 65%-75% of the thread profile depth in the radial direction of the thread.

7. The anti-loosening vehicle fuse (200) according to claim 4, characterized in that: The anti-loosening layer of each anti-fall screw is made of Pre-cote 80.

8. The anti-loosening vehicle fuse (200) according to claim 4, characterized in that: The first anti-fall screw (210) and the second anti-fall screw (220) are both configured as cross-slot pan head anti-fall screws; wherein the first anti-fall screw (210) has a GB818M4 standard thread, and the second anti-fall screw (220) has an ST4.2 self-tapping thread.

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