An electrical fuse

Abstract

The application discloses a power fuse, wherein a shell cover is slidably installed on a shell, and the shell cover and the shell are locked by a locking piece and a lock catch; when the shell cover needs to be opened, the locking piece is pushed into the movable cavity from the insertion hole, and the locking piece is pushed to release the lock catch, so that the shell cover is quickly opened under the pushing of a shell cover pushing spring; when the shell cover needs to be closed, the shell cover is pushed to be closed on the shell, the locking piece and the lock catch are re-engaged, and the shell cover and the shell are locked, so that the operation is convenient and fast, and the efficiency of replacing the fuse is improved.

Description

Technical Field

[0001] This invention relates to an electrical protection device, specifically an electrical fuse. Background Technology

[0002] A power fuse is an overcurrent protector widely used in control systems and electrical equipment. As a protector against short circuits and overcurrents, it is one of the most commonly used protective devices. During use, after the fuse element of a power fuse blows, it must be replaced with a new one. Traditional power fuses typically have their housing and cover tightened with screws, as shown in patent applications CN201620727257.1 and CN202220419022.1. When replacing the fuse element, the operator needs to remove each screw connecting the housing and cover, replace the fuse, and then tighten the screws again. This is very difficult to do in confined spaces. In such cases, the operator may have to disconnect the power fuse from the power line, remove the entire power fuse, and then replace the fuse element. The entire fuse replacement process is quite cumbersome.

[0003] To address this, some technologies have improved electrical fuses. For example, invention application number CN202121607631.1 discloses a fuse that is easy to disassemble and replace. This fuse includes a handle, a worm gear, and a first bracket. In use, rotating the handle causes the worm gear, limited by the first bracket, to drive the screw inside the worm wheel, limited by the second bracket. This causes the limiting block to move, separating the second housing from the first housing, facilitating the disassembly and replacement of the internal fuse element. This technology does not use screws to connect the first and second housings, eliminating the need to remove screws one by one during disassembly, thus improving the speed of fuse element replacement. However, this technology requires repeatedly turning the handle back and forth when disassembling the first and second housings, and the movement speed of the limiting block on the screw is very limited. Therefore, the disassembly efficiency of the first and second housings is still not ideal. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems and provide an electrical fuse that can quickly replace the fuse element.

[0005] The objective of this invention is achieved through the following technical solution: an electrical fuse, comprising a housing, a cover that slides onto the housing, a fusible element installed within the housing, two connecting components detachably connected to both ends of the fusible element, and an input line and an output line respectively connecting the two connecting components; a locking member is provided inside the housing, and a latching member is provided on the cover, the locking member and the latching member being able to lock each other to lock the cover onto the housing; the housing is also provided with a pushing structure for pushing the cover open.

[0006] Furthermore, the locking component includes a base and a sliding plate; the base is fixed to the bottom of the housing, and a base groove is provided on its upper surface; the sliding plate is slidably mounted on the base via a slider at its bottom; and a housing fastener is provided on the sliding plate.

[0007] The locking element includes a mounting hole formed on the lower surface of the cover and a cover latch block installed in the mounting hole by a compression spring;

[0008] When the shell cover is closed, the shell fastener and the shell cover fastener are locked together; when the sliding plate slides, it can cause the shell fastener to release the shell cover fastener.

[0009] The side wall of the housing is provided with a socket, and a pin can be inserted through the socket to push the sliding plate; a reset mechanism for pushing the sliding plate to reset is connected to the sliding plate.

[0010] The reset mechanism includes a connecting column, a reset spring, and a baffle; the connecting column is connected between the sliding plate and the inner wall of the housing, the reset spring and the baffle are both disposed on the connecting column, and the reset spring is located between the baffle and the inner wall of the housing; the sliding plate can adjust the length of the connecting column inserted into it when it slides.

[0011] The sliding plate is provided with an arc-shaped opening for the melt to pass through; there are two shell fasteners, which are located at the two ends of the arc-shaped opening respectively; the number and position of the locking fasteners correspond one-to-one with the two shell fasteners.

[0012] The housing fastener and the cover fastener are provided with mutually cooperating guide slopes.

[0013] The number of the pushing structures is two, and they are arranged opposite to each other. Each pushing structure includes a sliding cavity disposed on the housing, a housing cover pushing spring disposed in the sliding cavity, and a push plate disposed on the housing cover. Housing slide grooves are provided on opposite side walls of the sliding cavity, and push plate sliders that engage with the housing slide grooves are respectively provided on both sides of the push plate. The housing cover pushing spring is located between the end of the sliding cavity and the push plate, and it can push the push plate to slide within the sliding cavity to open the housing cover.

[0014] The housing is provided with two partitions, which divide the interior of the housing into an installation cavity and two movable cavities located on both sides of the installation cavity. The locking element and the melt are both located in the installation cavity. The two connecting components are respectively located in the two movable cavities, and the connecting ends of the two connecting components pass through the partitions and are respectively connected to the two ends of the melt.

[0015] The connecting assembly includes a connecting block, a connecting rod, a clamping spring, and a plug-in block; the connecting block is disposed in the movable cavity, one end of the connecting rod is connected to the connecting block, and the other end passes through the partition and is connected to the plug-in block, the clamping spring is sleeved on the connecting rod, and the clamping spring is located between the partition and the plug-in block; the connecting blocks on the two connecting assemblies are respectively provided with connecting bolts for fixing the input line and the output line.

[0016] The melt has blind holes at both ends, and each of the two connecting components has a plug-in block that can be inserted into the blind hole.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] (1) The cover of the present invention is slidably mounted on the housing, and the two are locked together by a locking member and a fastening member. When it is necessary to open the cover, simply insert the pin into the movable cavity through the insertion hole and push the locking member to release the fastening member. The cover will then open quickly under the push of the cover push spring. When it is necessary to close the cover, push the cover to close it on the housing. The locking member and the fastening member will re-lock, and the cover and the housing will be locked together. The operation is convenient and quick, improving the efficiency of melt replacement.

[0019] (2) The two ends of the melt of the present invention are connected to the input line and the output line through two connecting components. When replacing the new melt, it is only necessary to pull one of the connecting components and then clamp the new melt between the two connecting components, which makes the melt replacement efficiency faster.

[0020] Some of the additional features of this application will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, or upon understanding the production or operation of the embodiments. The features disclosed in this application can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components.

[0022] Figure 1 This is a structural diagram of the present invention.

[0023] Figure 2 This is a top view of the housing of the present invention.

[0024] Figure 3 This is a structural diagram of the locking component of the present invention.

[0025] Figure 4 for Figure 1 Cross-sectional view at point A-A.

[0026] Figure 5 This is a bottom view of the shell cover of the present invention.

[0027] Figure 6 This is a schematic diagram of the locking element of the present invention disposed on the cover.

[0028] Figure 7 This is a cross-sectional view of the molten material and the plug-in block of the present invention.

[0029] The reference numerals in the above figures are as follows: 1—shell cover, 2—shell, 3—partition, 4—movable cavity, 5—sliding cavity, 6—shell cover push spring, 7—output line, 8—locking element, 81—base, 82—sliding plate, 83—shell fastener, 84—arc-shaped opening, 85—base slide groove, 86—baffle, 87—connecting column, 88—reset spring, 9—melt, 10—plug-in block, 11—tightening spring, 12—connecting rod, 13—connecting block, 14—connecting bolt, 15—input line, 16—plug hole, 17—shell slide groove, 18—push plate, 19—locking element, 20—push plate slider, 21—mounting hole, 22—compression spring, 23—shell cover fastener, 24—mounting cavity. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0031] It should be noted that if the terms "first," "second," etc., are used in the specification, claims, and accompanying drawings of this application, they are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] In this application, when terms such as "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" are used, they indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] Furthermore, in this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Example

[0037] like Figure 1 As shown, this embodiment discloses an electrical fuse, which includes a housing 2 and a cover 1, the cover 1 being slidably fitted onto the housing 2.

[0038] To facilitate opening the cover 1, such as Figure 2 , 4 As shown in Figure 5, this embodiment has two pushing structures on the power fuse for pushing the cover 1 open. The two pushing structures are arranged opposite to each other on both sides of the power fuse so that the cover 1 can be pushed open smoothly.

[0039] Specifically, the pushing structure includes a sliding cavity 5 disposed on the upper surface of the side wall of the housing 2, a housing cover pushing spring 6 installed in the sliding cavity 5, and a push plate 18 disposed on the lower surface of the housing cover 1. Furthermore, housing grooves 17 are provided on both opposite side walls of the sliding cavity 5, and correspondingly, push plate sliders 20 are provided on both sides of the push plate 18. During installation, the push plate 18 is inserted into the sliding cavity 5, and the push plate sliders 20 on both sides of the push plate 18 are respectively engaged in the housing grooves 17 on the side walls of the sliding cavity 5, allowing the push plate 18 to slide back and forth within the sliding cavity 5 to cooperate with the opening and closing of the housing cover 1.

[0040] The cover push spring 6 is used to push the cover 1 open. It is located between the end of the sliding cavity 5 and the push plate 18, so it can push the push plate 18 to slide in the sliding cavity 5 to open the cover 1. With the above structure, when the cover 1 is closed, the cover push spring 6 is in a compressed state, and when the cover 1 is open, the cover push spring 6 is in an extended state.

[0041] In a specific configuration, horizontal limiting plates can be respectively installed at the upper ends of the opposite side walls of the sliding cavity 5. The limiting plates can be used to prevent the cover push spring 6 from popping out from the upper opening of the sliding cavity 5 when it is compressed. An opening is left between the two limiting plates for the push plate 18 to slide. In this case, the limiting plates are detachably connected to the side walls of the sliding cavity 5, such as by snap-on or screw connection. Detachable installation makes it easy to install the cover push spring 6 inside the sliding cavity 5.

[0042] In order to lock the shell cover 1 and the cover body 2, such as Figure 1 , 5 As shown, the housing 2 is provided with a locking member 8 inside, and correspondingly, the cover 1 is provided with a locking member 19. When the cover 1 is closed with the housing 2, the locking member 8 and the locking member 19 can lock each other to lock the cover 1 onto the housing 2.

[0043] Specifically, such as Figure 3 As shown, the locking component 8 includes a base 81 and a sliding plate 82. During installation, the base 81 is fixed to the bottom of the housing 2 with screws, and its upper surface is provided with a base groove 85. The bottom of the sliding plate 82 is provided with a slider that matches the base groove 85, and the sliding plate 82 is slidably mounted on the base 81 via its bottom slider. When the sliding plate 82 is pushed, it can move along the base groove 85.

[0044] In addition, a housing latch 83 is provided on the sliding plate 82.

[0045] like Figure 6As shown, the locking element 19 includes a mounting hole 21 formed on the lower surface of the cover 1 and a cover latch 23 mounted in the mounting hole 21 by a compression spring 22. The position of the cover latch 23 corresponds to the position of the housing latch 83. When the cover 1 is closed with the housing 2, the housing latch 83 and the cover latch 23 are locked together. When the sliding plate 82 slides, the housing latch 83 can release the cover latch 23.

[0046] The housing fastener 83 and the cover fastener 23 are provided with mutually cooperating guide ramps. When the cover 1 is pushed forward so that the housing fastener 83 and the cover fastener 23 abut against each other, the cover fastener 23 is pulled upward into the mounting hole 21 due to the action of the guide ramps. At this time, the cover fastener 23 is located above the housing fastener 83. If the cover 1 is pushed forward further, the cover fastener 23 passes over the housing fastener 83. At this time, the cover fastener 23 is not subjected to upward support force. Under the action of the compression spring 22, the cover fastener 23 extends downward out of the mounting hole 21 again. At this time, the cover fastener 23 and the housing fastener 83 are fastened together, the cover 1 is locked, and the cover push spring 6 is compressed.

[0047] In practical implementation, two housing fasteners 83 are used, with each fastener 83 positioned at one end of the sliding plate 82. Correspondingly, two locking fasteners 19 are also used, with their positions corresponding one-to-one with the two housing fasteners 83. By using two housing fasteners 83 and two locking fasteners 19, the housing cover 1 can be more securely locked.

[0048] To facilitate pushing the sliding plate 82, such as Figure 1 As shown, a socket 16 is provided on the side wall of the housing 2. The position of the socket 16 corresponds to the position of the sliding plate 82. When a pin is inserted through the socket 16, the sliding plate 82 can be pushed.

[0049] In addition, a reset mechanism for pushing the sliding plate 82 back to its original position is connected to the sliding plate 82. Specifically, the reset mechanism includes a connecting post 87, a reset spring 88, and a baffle 86. In configuration, the sliding plate 82 has a hole for inserting the connecting post 87. One end of the connecting post 87 is fixedly connected to the inner wall of the housing 2, and the other end is inserted into the hole in the sliding plate 82. When the sliding plate 82 slides along the base groove 85, the length of the connecting post 87 inserted into it can be adjusted.

[0050] Both the return spring 88 and the baffle 86 are mounted on the connecting post 87, and the return spring 88 is located between the baffle 86 and the inner wall of the housing 2. With this structure, the return spring 88 can push the baffle 86, thereby pushing the sliding plate 82 to its original position.

[0051] In the initial state, under the action of the return spring 88, the sliding plate 82 is in the initial position, pushing the shell cover 1 forward. When the shell cover latch 23 and the shell cover latch 83 are fastened together, the shell cover 1 is closed in place. When it is necessary to open the shell cover 1, a pin matching the insertion hole 16 is inserted into the shell 2 through the insertion hole 16, and the sliding plate 82 is pushed forcefully, causing the sliding plate 82 to move towards the reset mechanism. At this time, the shell cover latch 83 and the shell cover latch 23 are misaligned, and the shell cover latch 23 is released. Under the push of the shell cover push spring 6, the shell cover 1 is opened. At this time, the pin is pulled out, and the sliding plate 82 is reset under the push of the return spring 88. When the shell cover 1 is closed, the shell cover latch 23 and the shell cover latch 83 can be fastened together again. This allows the shell cover 1 to be opened quickly, improving the efficiency of melt replacement.

[0052] In addition, the housing 2 is equipped with two partitions 3, which divide the interior of the housing 2 into a mounting cavity 24 and two movable cavities 4 located on both sides of the mounting cavity 24. The locking member 8 is located inside the middle mounting cavity 24. A molten element 9 is also installed inside the mounting cavity 24, while each of the two movable cavities 4 is equipped with a connecting assembly. The connecting ends of the two connecting assemblies pass through the partitions 3 and extend into the mounting cavity 24, and are detachably connected to both ends of the molten element 9. The other ends of the two connecting assemblies are respectively connected to an input line 15 and an output line 7. The input line 15 connects to an external power supply device, and the output line 7 connects to an external electrical appliance. The partitions 3 serve to fix the connecting assemblies and prevent them from swinging.

[0053] In addition, the sliding plate 82 is provided with an arc-shaped opening 84 for the melt 9 to pass through, and the two shell fasteners 83 are located at the two ends of the arc-shaped opening 84 respectively. The size of the arc-shaped opening 84 is larger than the diameter of the melt 9 to ensure that the sliding plate 82 can slide and the shell cover fastener 23 and the shell fastener 83 can be misaligned.

[0054] Specifically, such as Figure 2 As shown, the connecting assembly includes a connecting block 13, a connecting rod 12, a clamping spring 11, and a plug-in block 10. In configuration, the connecting block 13 is positioned within the movable cavity 4. One end of the connecting rod 12 is connected to the connecting block 13, and the other end passes through the partition 3 and connects to the plug-in block 10. The clamping spring 11 is sleeved on the connecting rod 12 and is located between the partition 3 and the plug-in block 10. Connecting bolts 14 for fixing the input line 15 and the output line 7 are respectively provided on the connecting blocks 13 of the two connecting assemblies; that is, the input line 15 and the output line 7 can be fixed to the connecting blocks 13 of the two connecting assemblies using the connecting bolts 14.

[0055] In use, the current enters from the input line 15, flows through the connecting block 13, connecting rod 12, and plug-in block 10 of a connecting component in sequence to the melt 9, and then flows from the other end of the melt 9 through the plug-in block 10, connecting rod 12, and connecting block 13 of another connecting component in sequence to the output line 7.

[0056] like Figure 7 As shown, blind holes are provided at both ends of the melt 9, and plugs 10 on both connecting components are provided with plugs that insert into the blind holes. The cooperation of the blind holes and plugs makes the melt 9 and the plugs 10 more tightly connected.

[0057] In specific configuration, one of the connecting components' connecting block 13 can be fixed inside the housing 2 with screws. In this case, the clamping spring 11 does not need to be installed on the connecting component. During use, when the current flowing through it exceeds the specified value, the heat generated causes the fusible element 9 to melt, at which point a new fusible element 9 needs to be replaced. When replacing the fusible element 9, first open the housing cover 1 and remove the melted fusible element 9. When installing the new fusible element, pull the unfixed connecting component outward so that the gap between the plug blocks 10 of the two connecting components is sufficient to accommodate the new fusible element. Then, place the new fusible element between the plug blocks 10 of the two connecting components and slowly release the connecting component. Under the push of the clamping spring 11, the plug blocks 10 of the two connecting components clamp the new fusible element.

[0058] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0059] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this invention, and these solutions all fall within the scope of this invention and its protection. Those skilled in the art should understand that this specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this invention is defined by the claims and their equivalents.

Claims

1. An electric fuse, comprising a housing (2), a cover (1) slidingly fitted onto the housing (2), a fusible element (9) installed within the housing (2), two connecting assemblies detachably connected to both ends of the fusible element (9), and an input line (15) and an output line (7) respectively connected to the two connecting assemblies; characterized in that, The housing (2) is provided with a locking member (8), and the cover (1) is provided with a locking member (19). The locking member (8) and the locking member (19) can lock each other to lock the cover (1) onto the housing (2). The housing (2) is also provided with a pushing structure for pushing the cover (1) to open. The locking component (8) includes a base (81) and a sliding plate (82); the base (81) is fixed to the bottom of the housing (2), and a base groove (85) is provided on its upper surface; the sliding plate (82) is slidably mounted on the base (81) by a slider at its bottom; and a housing buckle (83) is provided on the sliding plate (82). The locking element (19) includes a mounting hole (21) formed on the lower surface of the cover (1) and a cover latch (23) mounted in the mounting hole (21) by a compression spring (22). When the cover (1) is closed with the shell (2), the shell fastener (83) and the cover fastener (23) are locked together; when the sliding plate (82) slides, the shell fastener (83) can release the cover fastener (23). The side wall of the housing (2) is provided with a socket (16), and the sliding plate (82) can be pushed by passing a pin through the socket (16); a reset mechanism for pushing the sliding plate (82) to reset is connected to the sliding plate (82); The reset mechanism includes a connecting column (87), a reset spring (88), and a baffle (86); the connecting column (87) is connected between the sliding plate (82) and the inner wall of the housing (2); the reset spring (88) and the baffle (86) are both disposed on the connecting column (87); and the reset spring (88) is located between the baffle (86) and the inner wall of the housing (2); when the sliding plate (82) slides, it can adjust the length of the connecting column (87) inserted into it.

2. The power fuse according to claim 1, characterized in that, The sliding plate (82) is provided with an arc-shaped opening (84) for the melt (9) to pass through; the housing fastener (83) is provided in two parts, and the two housing fasteners (83) are located at the two ends of the arc-shaped opening (84); the number and position of the locking fasteners (19) correspond one-to-one with the two housing fasteners (83).

3. The power fuse according to claim 1, characterized in that, The shell fastener (83) and the cover fastener (23) are provided with mutually cooperating guide slopes.

4. The power fuse according to claim 1, characterized in that, The number of the pushing structures is two, and they are arranged opposite to each other; the pushing structure includes a sliding cavity (5) arranged on the housing (2), a cover pushing spring (6) arranged in the sliding cavity (5), and a push plate (18) arranged on the cover (1); the sliding cavity (5) is provided with housing sliding grooves (17) on both opposite side walls, and the push plate (18) is provided with push plate sliders (20) on both sides that are inserted into the housing sliding grooves (17); the cover pushing spring (6) is located between the end of the sliding cavity (5) and the push plate (18), and it can push the push plate (18) to slide in the sliding cavity (5) so that the cover (1) can be opened.

5. The power fuse according to claim 1, characterized in that, The housing (2) is provided with two partitions (3), which divide the interior of the housing (2) into an installation cavity (24) and two movable cavities (4) located on both sides of the installation cavity (24); the locking member (8) and the melt (9) are both located in the installation cavity (24), and the two connecting components are respectively located in the two movable cavities (4), and the connecting ends of the two connecting components pass through the partitions (3) and are respectively connected to the two ends of the melt (9).

6. The power fuse according to claim 5, characterized in that, The connecting assembly includes a connecting block (13), a connecting rod (12), a clamping spring (11), and a plug-in block (10); the connecting block (13) is disposed in the movable cavity (4), one end of the connecting rod (12) is connected to the connecting block (13), and the other end passes through the partition (3) and is connected to the plug-in block (10); the clamping spring (11) is sleeved on the connecting rod (12), and the clamping spring (11) is located between the partition (3) and the plug-in block (10); the connecting blocks (13) on the two connecting assemblies are respectively provided with connecting bolts (14) for fixing the input line (15) and the output line (7).

7. The power fuse according to claim 6, characterized in that, The melt (9) has blind holes at both ends, and the plug blocks (10) on the two connecting components are each provided with a plug rod that can be inserted into the blind hole.

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