Fuse capable of being quickly replaced

Abstract

The invention discloses a fuse capable of being quickly replaced, and relates to the technical field of fuses, the fuse comprises a shell, a fuse body and a heat-conducting fin, the fuse body is installed in the shell through a wiring board, the fuse body comprises a fusing area and a non-fusing area, and the fusing area is easier to fuse compared with the non-fusing area; the heat-conducting fins are arranged in the shell and are distributed around the fuse body, the heat-conducting fins comprise a first heat-conducting fin and a second heat-conducting fin, the first heat-conducting fin faces the fusing area and corresponds to the fusing area, and the second heat-conducting fin faces the non-fusing area and corresponds to the non-fusing area; the first heat-conducting fins are arranged in a dispersed mode in the direction from the melt to the shell, and the second heat-conducting fins are arranged in a gathering mode in the direction from the melt to the shell. The fuse provided by the invention has relatively high heat dissipation performance, heat in the fuse can be dissipated in a relatively short time, rapid replacement or maintenance of the fuse is facilitated, and the problem of long time consumption of replacement of the fuse can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and particularly to a fuse with quick replacement. Background Art

[0002] A closed fuse usually consists of a fuse tube, contacts and a base. The fuse tube is filled with a fuse element, which is used to melt when the current is too large to protect the circuit. Contacts are usually installed at both ends of the fuse tube for connection to the circuit. The base is used to support and fix the fuse tube. The advantage of this fuse lies in its closed design, which can effectively prevent the influence of the external environment on the inside of the fuse, thus ensuring its normal operation.

[0003] For the existing closed fuses, when a short circuit occurs, the fuse element inside will melt, and the temperature inside the fuse will rise sharply during melting. When the staff replaces the fuse, due to the high temperature of the fuse, they must wait for its temperature to drop to a certain extent before replacement, which leads to a longer replacement time and is not conducive to the staff's timely repair of the circuit. Summary of the Invention

[0004] The present invention provides a fuse with quick replacement, which has strong heat dissipation performance, can dissipate the heat inside the fuse in a short time, is convenient for the quick replacement or repair of the fuse, and can solve the problem of long replacement time of the fuse.

[0005] The following technical solutions are adopted for a fuse with quick replacement of the present invention: A fuse with quick replacement includes a housing, a fuse element and heat conducting sheets. The fuse element is installed in the housing through a wiring board. The fuse element includes a fusing zone and a non-fusing zone, and the fusing zone is more likely to be fused than the non-fusing zone. The heat conducting sheets are arranged in the housing and distributed around the fuse element. The heat conducting sheets include a first heat conducting sheet and a second heat conducting sheet. The first heat conducting sheet faces the fusing zone and corresponds to the fusing zone, and the second heat conducting sheet faces the non-fusing zone and corresponds to the non-fusing zone. The first heat conducting sheet is arranged in a dispersed shape in the direction from the fuse element towards the housing, and the second heat conducting sheet is arranged in a converging shape in the direction from the fuse element towards the housing.

[0006] Further, the housing includes a first housing, a second housing and a cover. There are two first housings and two second housings. The heat conducting sheets are respectively arranged on the first housing and the second housing. The two first housings and the two second housings are symmetrically arranged with respect to the fuse element. The side ends of the first housing and the second housing abut against each other end to end to form a complete cylindrical structure. The cover is arranged at both ends of the cylindrical structure to limit the movement of the cylindrical structure and the fuse element.

[0007] Further, the melt is a strip-shaped sheet structural member. Two side ends of the melt respectively correspond to the two first casings, and two sides of the melt respectively correspond to the two second casings. The arrangement of the heat conducting sheets provided on the second casing is denser than that of the heat conducting sheets provided on the first casing.

[0008] Further, the melt includes a first section and a second section. The first section is the fusing area, and the second section is the non-fusing area. The first section and the second section are integrally provided. In a direction perpendicular to the axial direction of the casing, the cross-sectional width of the first section is smaller than that of the second section.

[0009] Further, the casing is filled with quartz sand.

[0010] Further, in a direction parallel to the radial direction of the casing, the particle size of the quartz sand close to the melt is smaller than that of the quartz sand close to the casing; In a direction parallel to the axial direction of the casing, the particle size of the quartz sand close to the fusing area is smaller than that of the quartz sand close to the non-fusing area.

[0011] Further, the cover body includes a limiting cylinder and a reinforcing sleeve. The limiting cylinder is sleeved at both ends of the cylindrical structural member and is in interference fit with the cylindrical structure. The reinforcing sleeve is threadedly connected to the limiting cylinder. A limiting assembly for restricting the movement of the cylindrical structure and the melt is provided between the reinforcing sleeve and the limiting cylinder.

[0012] Further, the limiting assembly includes a limiting plate. The limiting plate is provided at an end of the limiting cylinder away from the cylindrical structure. A limiting block is provided on a side of the limiting plate facing the limiting cylinder. Limiting notches communicating with each other are formed at ends of the limiting cylinder and the cylindrical structure facing the limiting plate. The limiting block is adapted to the limiting notch. When the limiting block is inserted into the limiting notch, synchronous rotation of the limiting cylinder, the cylindrical structure, and the limiting plate can be achieved.

[0013] Further, the limiting assembly further includes a stop gasket. The stop gasket is clamped between the limiting plate and the end plate of the reinforcing sleeve. A limiting hole is formed in the limiting plate, and a stop hole communicating with the limiting hole is formed in the stop gasket. One end of the wiring board extending out of the cylindrical structure passes through the corresponding limiting hole and the stop hole and extends out of the end port of the reinforcing sleeve to the outside of the casing. The stop gasket is used for restricting the movement of the wiring board in the casing.

[0014] Further, on one side of the limiting plate facing the limiting cylinder, there is a clamping plate. The clamping plate is inserted into the limiting cylinder, and a limiting channel is formed between the clamping plate and the inner side wall of the limiting cylinder. The cylindrical structure is inserted into the limiting channel.

[0015] The beneficial effects of the present invention are as follows: For a fast-replaceable fuse of the present invention, a fuse section with a smaller cross-sectional area is provided on the fuse element. When a circuit failure causes the current flowing through the fuse element to suddenly increase, the temperature of the fuse section with a smaller cross-sectional area rises faster, and thus can achieve fast fusing. By providing a heat-conducting sheet on the housing, the heat dissipated by the fuse element can be quickly transferred to the housing and dissipated to the outside by the housing. The first heat-conducting sheets facing the fuse section are arranged in a dispersed manner from inside to outside, so that the first heat-conducting sheets facing the fuse section are arranged more densely. The heat-conducting sheets with a higher density have a greater heat-conducting capacity, and thus can quickly direct the heat generated in the fuse section to the housing, accelerating the heat dissipation of the fuse element. Moreover, during the process of heat transfer by the first heat-conducting sheets, the interval between adjacent first heat-conducting sheets will become larger and larger, which is more conducive to heat dissipation; Secondly, the heat-conducting sheet can divide the arc generated in the fuse section and has an arc extinguishing effect. The first heat-conducting sheets and the second heat-conducting sheets in the same housing cooperate with each other to make the heat dissipation time of the fuse section and the non-fuse section tend to be the same, and this heat dissipation time is necessarily shorter than the natural heat dissipation time of the fuse element in the present invention, which can achieve fast heat dissipation of the present invention and can achieve replacement of the present invention faster; Furthermore, the quartz sand filled in the housing can play a role in accelerating the transfer of the heat generated by the fuse element. Moreover, the small-particle-size quartz sand filled at the fuse section can cut the arc generated in the fuse section into finer branches, which can accelerate the cooling and deionization of the fuse section. The larger-particle-size quartz sand away from the fuse section can release the heat pressure generated due to high temperature near the fuse element to one side of the housing faster, which can accelerate the release of pressure, and thus accelerate the cooling of the present invention, helping the staff to replace the fuse more quickly. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of a fast-replaceable fuse provided by an embodiment of the present invention; Figure 2 It is an exploded schematic diagram of a fast-replaceable fuse provided by an embodiment of the present invention; Figure 3 The top view of a fuse with quick replacement provided by an embodiment of the present invention; Figure 4 is Figure 3 the schematic cross-sectional structure diagram in the A-A direction in; Figure 5 is Figure 4 the enlarged structure diagram of part C in; Figure 6 is Figure 3 the schematic cross-sectional structure diagram in the B-B direction in; Figure 7 is Figure 6 the enlarged structure diagram of part D in.

[0018] In the figure: 100, housing; 110, first housing; 120, second housing; 130, cover body; 131, limiting cylinder; 132, reinforcing sleeve; 200, fuse element; 210, fusing zone; 220, non-fusing zone; 300, heat conducting sheet; 310, first heat conducting sheet; 320, second heat conducting sheet; 400, wiring board; 410, first board; 420, second board; 610, limiting board; 611, limiting block; 620, stop gasket; 700, clamping plate; 800, limiting notch. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0021] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0022] As Figures 1 to 4 shown, a fuse with quick replacement provided by an embodiment of the present invention includes a housing 100, a fuse element 200 and a heat conducting plate 300. The housing 100 is a cylindrical structural member, specifically, it may be a cylindrical ceramic housing. The fuse element 200 is installed in the housing 100 through a wiring board 400. The staff can independently select a suitable fuse element 200 according to the application scenario of the present invention. Generally, the material of the fuse element 200 is copper, silver, tin alloy, etc. The fuse element 200 includes a fusing zone 210 and a non-fusing zone 220. The fusing zone 210 is more easily fused compared to the non-fusing zone 220.

[0023] The material of the fusing zone 210 may be different from that of the non-fusing zone 220. When the material of the fusing zone 210 is the same as that of the non-fusing zone 220, in the direction perpendicular to the axial direction of the housing 100, the cross-sectional area of the fusing zone 210 is smaller than that of the non-fusing zone 220. When the current is the same, the heat generated by the fusing zone 210 in the same period is greater than that of other parts, and it is more easily fused; when the material of the fusing zone 210 is different from that of the non-fusing zone 220, the melting point of the fusing zone 210 is lower than that of other parts. Thus, after a short circuit occurs in the circuit, at the same current, the fusing zone 210 can be fused faster. In addition, the cross-sectional area of the fusing zone 210 with different materials can also be smaller, and it is more easily fused under the same current, and can protect the circuit safety more timely.

[0024] The wiring board 400 can be fixedly connected to both ends of the fuse element 200 through bolts. The wiring board 400 can be a copper plate, and the cross-sectional area of the wiring board 400 in the direction parallel to the axial direction of the housing 100 is larger than that of the fuse element 200. One end of the wiring board 400 away from the fuse element 200 penetrates through the corresponding end of the housing 100 and can be electrically connected to an external circuit.

[0025] It should be noted that in the present invention, there is a gap between the heat conducting sheets 300, and this gap can always maintain the normal flow of heat on the heat conducting sheets 300. In a unit area, the density of the heat conducting sheets 300 is always positively correlated with the heat conduction ability of the heat conducting sheets 300, and there is no factor that reduces the heat conduction of the heat conducting sheets 300 due to the excessive density of the heat conducting sheets 300.

[0026] The heat conducting sheets 300 are arranged in the housing 100 and distributed around the melt 200. The heat conducting sheets 300 can be selected as fan-shaped heat conducting sheets 300 with a certain curvature. The heat conducting sheets 300 can be insulating sheets made of ceramic material. The heat conducting sheets 300 include a first heat conducting sheet 310 and a second heat conducting sheet 320. A plurality of first heat conducting sheets 310 and second heat conducting sheets 320 are provided in the housing 100. Among them, the first heat conducting sheets 310 are close to the fusing area 210 of the melt 200 in the housing 100 and correspond to the fusing area 210. A plurality of first heat conducting sheets 310 are arranged in a dispersed manner at equal angular intervals from the inside to the outside, that is, from the melt 200 to one side of the housing 100; while the second heat conducting sheets 320 are close to the non-fusing area 220 and correspond to the non-fusing area 220. A plurality of second heat conducting sheets 320 are arranged in a converging manner at equal angular intervals from the inside to the outside, that is, from the melt 200 to one side of the housing 100.

[0027] Since the first heat conducting sheets 310 facing the fusing area 210 are arranged in a dispersed manner, it shows that one end of the first heat conducting sheets 310 close to the melt 200 faces the fusing area 210. The arrangement of the first heat conducting sheets 310 in the fusing area 210 is relatively dense, while the arrangement of the first heat conducting sheets 310 on the side facing the housing 100 is relatively loose. And the second heat conducting sheets 320 facing the non-fusing area 220 are arranged in a converging manner, indicating that one end of the second heat conducting sheets 320 close to the melt 200 faces the non-fusing area 220. The arrangement of the second heat conducting sheets 320 in the non-fusing area 220 is relatively loose, while the arrangement of the second heat conducting sheets 320 on the side facing the housing 100 is relatively dense. The more densely arranged first heat conducting sheets 310 can conduct the heat in the fusing area 210 to the housing 100 faster. Since the heat conducting sheets 300 close to the fusing area 210 are arranged in a dispersed manner from the inside to the outside, therefore, in the direction perpendicular to the axial direction of the housing 100, the distance between adjacent heat conducting sheets 300 gradually increases, and the increased gap is beneficial to the heat dissipation of the heat conducting sheets 300; For the heat conducting sheets 300 far from the fusing area 210, they are arranged in a converging manner at equal angles from the melt 200 to one side of the housing 100. This enables the heat conducting sheets 300 in the non-fusing area 220 to complement those in the fusing area 210, and can make better use of the space in the housing 100 to achieve the purpose of rapid heat dissipation of the present invention.

[0028] The operating principle of the present invention is: Electrically connect two wiring boards 400 of the present invention in a suitable circuit. When a short circuit occurs in the circuit, causing the current flowing through the fuse element 200 to increase suddenly, the fusing zone 210 can quickly fuse to protect the safety of the circuit; the heat generated by the fusing zone 210 can be quickly transferred to the housing 100 through the first heat-conducting fins 310 arranged in a dispersed manner near the fusing zone 210, and the heat generated by the non-fusing zone 220 can be quickly transferred to the housing 100 through the second heat-conducting fins 320 arranged in an aggregated manner near the non-fusing zone 220, and then dissipated to the outside from the housing 100; Since the arrangement of the first heat-conducting fins 310 facing the fusing zone 210 is denser, the heat conduction amount is also greater, and the heat generated by the fusing zone 210 can be quickly guided to the housing 100, enabling the present invention to dissipate heat quickly. Moreover, during the process of transferring heat, the distance between adjacent first heat-conducting fins 310 will become larger in the radial direction of the housing 100, which is more conducive to heat dissipation; Secondly, the heat-conducting fins 300 can divide the arc generated by the fusing zone 210 and have an arc extinguishing effect. The first heat-conducting fins 310 and the second heat-conducting fins 320 cooperate with each other to make the heat dissipation time of the fusing zone 210 and the non-fusing zone 220 tend to be consistent. Specifically: In the direction parallel to the axial direction of the housing 100, the length of the second heat-conducting fins 320 adjacent to the fusing zone 210 is longer than that of other second heat-conducting fins 320, and the temperature is also higher. The heat transfer speed on the corresponding heat-conducting fins 300 is faster, while the length of the second heat-conducting fins 320 farther away from the fusing zone 210 is shorter, and the temperature of the corresponding non-fusing zone 220 is also lower. The heat transfer speed on the corresponding heat-conducting fins 300 is slower. And the heat dissipation time with a long distance but fast speed and the heat dissipation time with a short distance but slow speed will tend to be consistent. Therefore, the heat transfer or heat dissipation time of the second heat-conducting fins 320 near and far from the fusing zone 210 will tend to be consistent. Due to the arranged heat-conducting fins 300, the heat dissipation time of the second heat-conducting fins 320 must be lower than the natural heat dissipation time of the fuse element 200; Similarly, the heat dissipation time of each of the first heat-conducting fins 310 arranged in a dispersed manner will also tend to be consistent, and the heat dissipation time of the first heat-conducting fins 310 must also be lower than the natural heat dissipation time of the fuse element 200. Therefore, both the heat dissipation time of the first heat-conducting fins 310 and the heat dissipation time of the second heat-conducting fins 320 are lower than the heat dissipation time of the fuse element 200 itself. And since the first heat-conducting fins 310 and the second heat-conducting fins 320 are both located in the same housing 100, the heat dissipation time of the first heat-conducting fins 310 will ultimately tend to be consistent with the heat dissipation time of the second heat-conducting fins 320, and the finally consistent heat dissipation time must also be lower than the heat dissipation time of the fuse element 200 itself. Thus, the rapid cooling of the present invention can be achieved, and the rapid replacement of the present invention can be realized.

[0029] In addition, the first heat-conducting fins 310 arranged in a dispersed manner and the second heat-conducting fins 320 arranged in an aggregated manner cooperate with each other to make more effective use of the internal space of the housing 100, maximizing heat dissipation and further shortening the heat dissipation time of the present invention. The melted body 200 after heat dissipation or the present invention is more convenient for replacement and repair, and can solve the problem of long time-consuming fuse replacement.

[0030] In some embodiments, the housing 100 includes a first housing 110, a second housing 120 and a cover 130. There are two first housings 110 and two second housings 120. The two first housings 110 and the two second housings 120 are symmetrically arranged with respect to the melted body 200. The side ends of the first housing 110 and the second housing 120 are abutted end to end to form a complete cylindrical structure. The cover 130 is arranged at both ends of the cylindrical structure to limit the movement of the cylindrical structure and the melted body 200.

[0031] Specifically, both the first housing 110 and the second housing 120 are arc plates, and the cross-sectional radii of the arc plates are equal. The central angle corresponding to the arc plate cross-section is 90 degrees. Four arc plates with a central angle of 90 degrees in cross-section can be assembled into a complete lidless cylinder. There are two covers 130, and the two covers 130 are respectively covered at both ends of the lidless cylinder. The cylindrical housing 100 can reduce the influence of the external environment on the melted body 200 and provide better protection for the melted body 200.

[0032] In some embodiments, such as Figures 4 to 7 , the melted body 200 is a long strip-shaped sheet-like structural member, specifically it can be a copper sheet. The two first housings 110 respectively correspond to the two side ends of the melted body 200 and are symmetrically arranged with respect to the central axis of the melted body 200. The two second housings 120 respectively correspond to the two side surfaces of the melted body 200 and are also symmetrically arranged with respect to the central axis of the melted body 200.

[0033] In this embodiment, the density of the heat-conducting fins 300 arranged on the first housing 110 is lower than the density of the heat-conducting fins 300 arranged on the second housing 120. That is, in the direction parallel to the axial direction of the housing 100, within the same distance of the first housing 110 and the second housing 120, the number of heat-conducting fins 300 arranged on the first housing 110 is less than the number of heat-conducting fins 300 arranged on the second housing 120. The heat-conducting fins 300 here include the first heat-conducting fins 310 and the second heat-conducting fins 320.

[0034] Since the side area of the second housing 120 corresponding to the fuse 200 is larger than the side end area of the first housing 110 corresponding to the fuse 200. Under the same material, the larger the area, the more heat can be transferred from the side of the fuse 200, and the smaller the area, the less heat can be transferred from the end face of the fuse 200. When the fuse 200 melts, the heat transferred from the side of the fuse 200 is greater than the heat transferred from the end face of the fuse 200. Because the distance between the second housing 120 and the side of the fuse 200 is farther than the distance between the first housing 110 and the side end of the fuse 200. Therefore, if the arrangement of the heat conducting fins 300 (the first heat conducting fin 310 and the second heat conducting fin 320) on the second housing 120 is denser, the time required for the heat of the fuse 200 to be transferred to the second housing 120 through the heat conducting fins 300 from the side of the fuse 200 is approximately the same as the time required for the heat of the fuse 200 to be transferred to the first housing 110 through the heat conducting fins 300 from the side end of the fuse 200, and this time is necessarily shorter than the natural cooling time of the present invention.

[0035] Therefore, the denser heat conducting fins 300 provided on the second housing 120 can transfer heat to the second housing 120 faster, and thus can dissipate heat from the present invention faster, greatly shortening the heat dissipation duration of the present invention and enabling rapid replacement of the present invention.

[0036] Further, the fuse 200 includes a first section and a second section. The first section is the fusing area 210, and the second section is the non-fusing area 220. The first section and the second section are of the same material and are integrally provided. In the direction perpendicular to the axial direction of the housing 100, the cross-sectional width of the first section is smaller than the cross-sectional width of the second section.

[0037] In this embodiment, the first section and the second section are integrally formed and have the same thickness. In the direction perpendicular to the axial direction of the housing 100, the cross-sectional width of the first section is smaller than the cross-sectional width of the second section, which means that the cross-sectional area of the first section is smaller than the cross-sectional area of the second section. For the same magnitude of current, the smaller the cross-sectional area, the greater the resistance, and thus the greater the heat generation. When a short circuit occurs in the circuit, the first section is more likely to be fused.

[0038] In some embodiments, the housing 100 is filled with quartz sand (not shown in the figure). When the fusing area 210 of the fuse 200 melts, the contact area between the quartz sand and the arc formed by the fusing area 210 is large, which can enhance the absorption of heat. At the same time, the quartz sand can cut the arc into finer branches, thereby accelerating cooling and deionization.

[0039] Further, in the direction parallel to the radial direction of the housing 100, the particle size of the quartz sand near the fuse 200 is smaller than the particle size of the quartz sand near the non-fusing area 220; In the direction parallel to the axis of the housing 100, the particle size of the quartz sand near the fusing zone 210 is smaller than that of the quartz sand near the non-fusing zone 220.

[0040] In this embodiment, when the fusing zone 210 fuses, an electric arc will be generated. The small-particle-size quartz sand can cut the electric arc into finer branches, which can accelerate the cooling and deionization of the melt 200. However, the small-particle-size quartz sand will also impede the flow of gas during arc extinction, thereby causing an increase in the pressure inside the housing 100. Although the large-particle-size quartz sand is weaker in arc extinction, the large-particle-size quartz sand can not only increase the contact area with heat, but also has a larger gap between the large-particle-size quartz sands, and the pressure release speed is faster.

[0041] In the direction parallel to the radial direction of the housing 100, filling small-particle-size quartz sand near the melt 200 can cool and conduct heat to the melt 200 faster. The large-particle-size quartz sand far from the melt 200 can not only transfer heat, but also release the heat pressure generated by high temperature near the melt 200 to one side of the housing 100 faster, which is more conducive to the heat dissipation of the present invention.

[0042] In the direction parallel to the axis of the housing 100, the particle size of the quartz sand filled near the fusing zone 210 is smaller. The smaller quartz sand can cut the electric arc generated in the fusing zone 210 into finer branches, which can further accelerate the cooling and deionization of the fusing zone 210. The larger particle size of the quartz sand far from the fusing zone 210 can also play a role in accelerating heat transfer and accelerating the cooling of the melt 200.

[0043] The quartz sand provided in the present invention can take into account the advantages of arc extinction efficiency, heat dissipation and pressure control, can cool the present invention faster, and then the staff can replace the new fuse more quickly.

[0044] In some embodiments, as Figure 2 and Figure 4 shown, the cover 130 includes a limiting cylinder 131 and a reinforcing sleeve 132. The limiting cylinder 131 is sleeved at both ends of the cylindrical structure and is in interference fit with the cylindrical structure. The reinforcing sleeve 132 is threadedly connected to the limiting cylinder 131. A limiting component for restricting the movement of the cylindrical structure and the melt 200 is provided between the reinforcing sleeve 132 and the limiting cylinder 131.

[0045] In this embodiment, the cylindrical structure formed by the end-to-end abutment of the side ends of the first housing 110 and the second housing 120 can maintain its cylindrical shape under the restriction of the limiting cylinder 131, and can prevent the cylindrical structure from falling apart. The interference fit between the cylindrical structure and the limiting cylinder 131 makes the connection between the cylindrical structure and the limiting cylinder 131 closer.

[0046] The reinforcing sleeve 132 can further reinforce the limiting sleeve. The limiting component disposed between the reinforcing sleeve 132 and the limiting cylinder 131 can not only limit the rotation of the cylindrical structure within the limiting cylinder 131, but also restrict the movement of the melt 200 within the cylindrical structure.

[0047] Further, the limiting component includes a limiting plate 610. The limiting plate 610 is disposed at one end of the limiting cylinder 131 away from the cylindrical structure. A limiting block 611 is provided on the side of the limiting plate 610 facing the limiting cylinder 131. Limiting slots 800 that communicate with each other are formed at one end of the limiting cylinder 131 and the cylindrical structure facing the limiting plate 610. The limiting block 611 is adapted to the limiting slots 800. When the limiting block 611 is inserted into the limiting slots 800, synchronous rotation of the limiting cylinder 131, the cylindrical structure, and the limiting plate 610 can be achieved.

[0048] In this embodiment, the limiting block 611 on the limiting plate 610 can limit the housing 100 or the cylindrical structure disposed on the limiting cylinder 131, enabling the limiting plate 610 to rotate synchronously with the housing 100. Moreover, the limiting cylinder 131 is threadedly connected to the reinforcing sleeve 132. Therefore, the limiting plate 610 can prompt the reinforcing sleeve 132 to reinforce the housing 100, further reducing the possibility of the housing 100 (cylindrical structure) disintegrating.

[0049] Furthermore, the limiting component further includes a stop gasket 620. The stop gasket 620 is clamped between the limiting plate 610 and the end plate of the reinforcing sleeve 132. The stop gasket 620 is coaxially disposed with the reinforcing sleeve 132, the limiting cylinder 131, and the housing 100. A limiting hole is formed in the limiting plate 610, and a stop hole communicating with the limiting hole is formed in the stop gasket 620. One end of the wiring board 400 extending out of the cylindrical structure passes through the corresponding limiting hole and stop hole and extends outside the housing 100 from the end port of the reinforcing sleeve 132.

[0050] Specifically, in the present invention, the wiring board 400 is a metal plate member with a rectangular cross-section. The wiring board 400 includes a first plate 410 and a second plate 420 integrally provided. In the direction parallel to the axial direction of the housing 100, the width of the first plate 410 is greater than the width of the second plate 420. The limiting hole formed in the limiting plate 610 and the stop hole formed in the stop gasket 620 are adapted to the second plate 420, that is, both the limiting hole and the stop hole are rectangular holes adapted to the second plate 420. One end of the second plate 420 is fixed to one end of the melt 200 by bolts, and the other end passes through the limiting hole and the stop hole in sequence and is connected to the first plate 410. When the second plate 420 passes through the limiting hole and the stop hole, the inner side walls of the limiting hole and the stop hole contact the outer side wall of the second plate 420. The rectangular hole setting of the limiting hole and the stop hole can limit the rotation of the second plate 420 within the housing 100, that is, the rotation of the wiring board 400 within the housing 100.

[0051] In the direction parallel to the axis of the housing 100, the width of the first plate 410 is greater than that of the second plate 420. Therefore, in the direction parallel to the axis of the housing 100, the first plate 410 cannot pass through the limiting hole and the blocking hole. Since both ends of the melt 200 are connected to the wiring board 400, the melt 200 cannot move in the direction parallel to the axis of the housing 100 within the housing 100.

[0052] In the present invention, the blocking gasket 620 restricts the movement of the wiring board 400 within the housing 100, thereby enabling the structure of the present invention to be more stable.

[0053] In some embodiments, a clamping plate 700 is provided on the side of the limiting plate 610 facing the limiting cylinder 131. The clamping plate 700 is inserted into the limiting cylinder 131 and a limiting channel is formed between the clamping plate 700 and the inner wall of the limiting cylinder 131. One end of the cylindrical structure is inserted into the limiting channel.

[0054] Specifically, the clamping plate 700 is an arc-shaped plate. The clamping plate 700 is fixed on the limiting block 611. When the limiting block 611 is inserted into the limiting notch 800 of the limiting cylinder 131, the clamping plate 700 is inserted into the limiting cylinder 131 accordingly, and a limiting channel is formed between the clamping plate 700 and the inner wall of the limiting cylinder 131. Then, the cylindrical structure formed by enclosing the first housing 110 and the second housing 120 is inserted into the limiting cylinder 131, and the end of the cylindrical structure can be inserted into the limiting channel. When the limiting block 611 is inserted into the limiting notch 800 of the cylindrical structure and the cylindrical structure abuts against the limiting plate 610, the connection between the limiting plate 610 and the cylindrical structure is completed.

[0055] In this embodiment, the clamping plate 700 can strengthen the structural strength of the cylindrical structure formed by the first housing 110 and the second housing 120, and prevent the cylindrical structure from falling apart due to vibration of the present invention. The clamping plate 700 can maintain the overall integrity of the cylindrical structure.

[0056] In addition, since the housing 100 of the present invention is provided in a split manner, the assembly of the present invention is also more convenient. Moreover, in the split housing 100, it is also more convenient to fill quartz sand with different particle sizes into the housing 100, and the heat dissipation of the present invention can be better controlled.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A quick-change fuse, characterized in that: include: Housing (100); A fuse (200), the fuse (200) being installed in the housing (100) via a terminal block (400), the fuse (200) comprising a fusing area (210) and a non-fusing area (220), the fusing area (210) being easier to be fused than the non-fusing area (220); a heat conducting sheet (300), the heat conducting sheet (300) being arranged in the housing (100) and distributed around the fuse (200), the heat conducting sheet (300) comprising a first heat conducting sheet (310) and a second heat conducting sheet (320), the first heat conducting sheet (310) facing the melting area (210) and corresponding to the melting area (210), and the second heat conducting sheet (320) facing the non-melting area (220) and corresponding to the non-melting area (220); The first heat conducting plates (310) are arranged in a dispersed manner in a direction from the melt (200) toward the shell (100), and the second heat conducting plates (320) are arranged in a gathered manner in a direction from the melt (200) toward the shell (100).

2. A quick-change fuse according to claim 1, characterized in that: The shell (100) comprises a first shell (110), a second shell (120) and a cover (130), wherein two of the first shell (110) and two of the second shell (120) are provided, and the heat conductive sheet (300) is respectively arranged on the first shell (110) and the second shell (120), and the two first shells (110) and the two second shells (120) are symmetrically arranged with respect to the melt (200), and the side ends of the first shell (110) and the second shell (120) are butted against each other end to end to form a complete cylindrical structure, and the cover (130) is arranged at both ends of the cylindrical structure to limit the movement of the cylindrical structure and the melt (200).

3. A quick-change fuse according to claim 2, characterized in that: The melt (200) is a long sheet-like structural member, the two side ends of the melt (200) correspond to the two first shells (110) respectively, the two side surfaces of the melt (200) correspond to the two second shells (120) respectively, and the arrangement of the heat conductive sheet (300) arranged on the second shell (120) is denser than the arrangement of the heat conductive sheet (300) arranged on the first shell (110).

4. A quick-change fuse according to claim 3, characterized in that: The fuse (200) comprises a first section and a second section, the first section being the fuse zone (210), the second section being the non-fuse zone (220), the first section and the second section being integrally arranged, and in a direction perpendicular to the axial direction of the shell (100), a cross-sectional width of the first section is smaller than a cross-sectional width of the second section.

5. A quick-change fuse according to claim 3, characterized in that: The shell (100) is filled with quartz sand.

6. A quick-change fuse according to claim 5, characterized in that: In a direction parallel to the radial direction of the shell (100), the particle size of the quartz sand close to the melt (200) is smaller than the particle size of the quartz sand close to the shell (100); In a direction parallel to the axial direction of the housing (100), the particle size of the quartz sand close to the fusing area (210) is smaller than the particle size of the quartz sand close to the non-fusing area (220).

7. A quick-change fuse according to claim 2, characterized in that: The cover body (130) includes a limiting cylinder (131) and a reinforcing sleeve (132); the limiting cylinder (131) is sleeved on both ends of the cylindrical structure and is interference fit with the cylindrical structure; the reinforcing sleeve (132) is threadedly connected to the limiting cylinder (131); and a limiting component for limiting the movement of the cylindrical structure and the melt (200) is provided between the reinforcing sleeve (132) and the limiting cylinder (131).

8. A quick-change fuse according to claim 7, characterized in that: The limiting assembly comprises a limiting plate (610), wherein the limiting plate (610) is arranged at one end of the limiting cylinder (131) away from the cylindrical structure, and a limiting block (611) is provided on the side of the limiting plate (610) facing the limiting cylinder (131). The limiting cylinder (131) and the end of the cylindrical structure facing the limiting plate (610) are both provided with mutually communicating limiting slots (800), and the limiting block (611) is adapted to the limiting slot (800). When the limiting block (611) is inserted into the limiting slot (800), synchronous rotation of the limiting cylinder (131), the cylindrical structure and the limiting plate (610) can be achieved.

9. A quick-change fuse according to claim 8, characterized in that: The limiting assembly also includes a stop gasket (620), which is clamped between the limiting plate (610) and the end plate of the reinforcement sleeve (132). The limiting plate (610) is provided with a limiting hole, and the stop gasket (620) is provided with a stop hole that communicates with the limiting hole. One end of the terminal block (400) extending out of the tubular structure passes through the corresponding limiting hole and the stop hole and extends from the end port of the reinforcement sleeve (132) to the outside of the shell (100). The stop gasket (620) is used to limit the movement of the terminal block (400) in the shell (100).

10. A quick-change fuse according to claim 8, characterized in that: The limiting plate (610) faces a clamping plate (700) on one side of the limiting cylinder (131); the clamping plate (700) is inserted into the limiting cylinder (131) and forms a limiting channel with the inner side wall of the limiting cylinder (131); the cylindrical structure is inserted into the limiting channel.

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