A small fuse

Abstract

The application provides a small fuse, belonging to the field of current protection devices. The small fuse comprises a base, two wiring elements and two conductive pieces are installed on the base, the conductive pieces are electrically connected with the corresponding wiring elements, the conductive pieces comprise a fixed part and a clamping part for clamping a fuse core, the fixed part is located between the wiring element and the base, and a connecting structure for fixing the wiring element and clamping the fixed part between the wiring element and the base is arranged between the wiring element and the base. The conductive piece is press-fitted between the wiring element and the base, a structure for fixing the conductive piece is not needed, and the manufacturing cost of the small fuse is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of current protection devices, in particular to a small fuse. BACKGROUND

[0002] When the current in the circuit exceeds the predetermined value, the fuse core in the fuse will be fused, thereby cutting off the power supply to prevent accidents.

[0003] The existing Chinese utility model patent with the authorization announcement number CN218677024U and the authorization announcement date of March 21, 2023 discloses a novel fuse terminal, which comprises a base and a handle. One side of the handle is provided with a fuse core support matched with an embedded groove. The fuse core support is provided with an integrated circuit board and a fuse tube. The fuse tube has metal contact pieces on both ends of the surface. Two wiring elements and two conductive pieces are arranged in the base. The two conductive pieces are located between the two wiring elements, and the conductive pieces are in conduction with the corresponding wiring elements.

[0004] After the fuse tube is installed in the base, the metal contact pieces of the fuse tube are in contact and conduction with the conductive pieces, and then in conduction with the wiring elements. The conductive pieces are in U-shaped structure, which clamps the fuse tube after being installed, so as to ensure good electrical contact. During the process of installing the fuse tube, the conductive pieces will be subjected to a large force. Therefore, the above-mentioned fuse terminal is provided with a special mounting structure in the base to stably mount the conductive pieces in the base, which makes the structure of the base complex and increases the manufacturing cost of the fuse terminal. SUMMARY

[0005] The purpose of the present application is to provide a small fuse to solve the technical problems in the prior art that the special mounting structure needs to be arranged in the base to fix and mount the conductive pieces, which makes the structure of the base complex and the manufacturing cost high.

[0006] To achieve the above-mentioned purpose, the technical scheme of the small fuse provided by the present application is as follows:

[0007] A small fuse comprises a base. Two wiring elements and two conductive pieces are mounted on the base. The conductive pieces are in electrical conduction with the corresponding wiring elements. The conductive pieces comprise a fixed part and a clamping part for clamping the fuse core. The fixed part is located between the wiring element and the base. A connecting structure is arranged between the wiring element and the base for fixing the wiring element and clamping the fixed part between the wiring element and the base.

[0008] As a further improvement, the connecting structure comprises a connecting hole arranged on the wiring element. The corresponding position of the base is provided with a matching hole corresponding to the connecting hole. A connecting bolt for connecting the wiring element and the base is mounted in the connecting hole and the matching hole. The fixed part is provided with a through hole corresponding to the connecting hole and for the connecting bolt to pass through.

[0009] As a further improvement, the connecting hole is a through hole, the fitting hole is a threaded hole, the wiring element is provided with a wiring hole for the wire to pass through, the connecting hole is located on one side wall of the wiring element and communicates with the wiring hole, and the side wall of the wiring element away from the connecting hole is provided with an operating hole for mounting a connecting bolt, the operating hole communicates with the wiring hole and is coaxial with the connecting hole.

[0010] As a further improvement, the operating hole is a threaded mounting hole, and the threaded mounting hole is used to connect a wiring bolt for compressing the wire after the connecting bolt is mounted.

[0011] As a further improvement, two limiting walls are arranged on the base at each wiring element, and the two limiting walls are respectively located on two sides of the wiring element, and the width of the wiring element is equal to the spacing of the corresponding two limiting walls.

[0012] As a further improvement, the width of the fixing part is equal to the spacing of the corresponding two limiting walls.

[0013] As a further improvement, the base is provided with a mounting groove for accommodating the fuse core, a limiting groove is formed in the side wall of the mounting groove in the length direction, and the two side walls of the limiting groove respectively constitute the limiting walls.

[0014] As a further improvement, the small fuse further comprises a protective cover capable of being buckled to the base, the inner side of the protective cover is provided with a fuse core mounting structure for mounting the fuse core, one of the protective cover and the base is provided with a clamping protrusion, and the other is provided with a clamping groove matched with the clamping protrusion.

[0015] As a further improvement, the protective cover is provided with an observation hole penetrating through the protective cover and opposite to the fuse core mounting structure.

[0016] As a further improvement, the protective cover is provided with a prying hole for prying up the protective cover, and the prying hole is located at at least one end of the protective cover in the length direction.

[0017] The small fuse provided by the present application has the following advantages: the small fuse in the present application is an improvement on the prior art. The base of the small fuse does not separately provide a structure for mounting the conductive part, and the fixing part of the conductive part is located between the wiring element and the base. The wiring element is fixedly connected to the base by the connecting structure, and at the same time, the conductive part is also stably compressed and fixed. Therefore, compared with the prior art, the base structure of the small fuse is simplified, and the manufacturing cost of the small fuse is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the small fuse in the present application.

[0019] Figure 2Structure schematic view of bottom part of small fuse without protective cover in the application;

[0020] Figure 3 Structure schematic view of bottom part of small fuse without protective cover in the application;

[0021] Figure 4 Structure schematic view of base of small fuse in the application;

[0022] Figure 5 Structure schematic view of wiring element of small fuse in the application;

[0023] Figure 6 Structure schematic view of conductive part of small fuse in the application;

[0024] Figure 7 Structure schematic view of clamping part of small fuse in the application;

[0025] Figure 8 Structure schematic view of protective cover of small fuse in the application;

[0026] Figure 9 Structure schematic view of protective cover of small fuse in the application.

[0027] Explanation of reference signs:

[0028] 1, base; 2, protective cover; 3, fuse core; 4, clamping groove; 5, clamping part; 6, mounting groove; 7, limiting groove; 8, limiting wall; 9, wiring element; 10, wiring hole; 11, conductive part; 111, clamping part; 112, fixed part; 113, through hole; 12, connecting hole; 13, matching hole; 14, threaded mounting hole; 15, wiring bolt; 16, mounting ring; 17, supporting rod; 18, stop block; 19, elastic plate; 20, clamping protrusion; 21, clamping groove; 22, anti-skid groove; 23, avoiding groove; 24, observation hole; 25, prying hole; 26, bolt hole. DETAILED DESCRIPTION

[0029] The application will be further described in detail below in combination with embodiments.

[0030] The application is to solve the technical problems in the prior art, and the main idea is to press-fit the conductive part between the wiring element and the base, without separately setting a structure for fixing the conductive part, thereby reducing the manufacturing cost of the small fuse.

[0031] The specific embodiments of the small fuse provided by the application are as follows:

[0032] A small fuse, comprising a base 1, a protective cover 2 and a fuse core 3.

[0033] Referring to the drawings,Figure 1 , attached Figure 2 and attached Figure 3 The bottom of the base 1 is provided with a clamping groove 4 for mounting the base 1 to the guide rail, and the bottom of the base 1 is also provided with a clamping piece 5 for stabilizing the base 1 on the clamping groove 4. The structure of the clamping piece 5 is described with reference to the attached Figure 7 The clamping piece 5 is a prior art and will not be described here. In order to facilitate the installation of the small fuse at a position without a guide rail, bolt holes 26 for mounting bolts are also provided at the four corners of the bottom of the base 1.

[0034] Referring to the attached Figure 4 The side of the base 1 away from the clamping groove 4 is provided with a mounting groove 6, and the opening direction of the mounting groove 6 is the height direction of the base 1. Limiting grooves 7 are formed on the two side walls of the length direction of the mounting groove 6, and wiring elements 9 are embedded in the limiting grooves 7. Referring to the attached Figure 5 The wiring element 9 is a cuboid structure, and a wiring hole 10 for passing the wire is formed in the length direction of the wiring element 9. The length of the wiring element 9 is equal to the thickness of the side wall in the length direction of the mounting groove 6, so that the two side walls of the wiring element 9 in the length direction are respectively aligned with the inner and outer sides of the side wall in the length direction of the mounting groove 6.

[0035] Two conductive pieces 11 are provided between the two wiring elements 9, and the conductive piece 11 is located in the mounting groove 6 and electrically connected to the corresponding wiring element 9. Referring to the attached Figure 6 The conductive piece 11 is integrally formed by a plate material, including a clamping portion 111 and a fixing portion 112. The clamping portion 111 is a U-shaped structure as a whole, and the two side walls of the clamping portion 111 are wavy to increase the contact area with the fuse core 3 and improve the stability of clamping the fuse core 3. The fixing portion 112 is a sheet structure, and the width of the fixing portion 112 is equal to the width of the wiring element 9, and the fixing portion 112 is located between the wiring element 9 and the bottom wall of the limiting groove 7.

[0036] A connecting structure is provided between the wiring element 9 and the base 1 for fixing the wiring element 9 and clamping the fixing portion 112 of the wiring element 9 and the base 1. In this embodiment, the connecting structure includes a connecting hole 12 provided on the wiring element 9 facing the bottom wall of the limiting groove 7, the connecting hole 12 is communicated with the wiring hole 10, and a corresponding matching hole 13 is formed on the bottom wall of the limiting groove 7. The connecting hole 12 is a through hole, and the matching hole 13 is a threaded hole. A connecting bolt is arranged in the connecting hole 12, and after the connecting bolt is screwed with the matching hole 13, the wiring element 9 and the base 1 are fixedly connected. A through hole 113 is formed in the fixing portion 112 for the bolt to pass through. After the connecting bolt is tightened, the wiring element 9 will clamp the fixing portion 112 together with the base 1, thereby realizing the fixation of the conductive piece 11, and also making the conductive piece 11 conductive with the wiring element 9.

[0037] The wiring element 9 is provided with a threaded mounting hole 14 on the side wall away from the connecting hole 12, which is in communication with the wiring hole 10. A wiring bolt 15 for compressing the wire is arranged in the threaded mounting hole 14. The threaded mounting hole 14 is coaxial with the connecting hole 12, and the hole diameter of the threaded mounting hole 14 is larger than that of the connecting hole 12. When assembling the wiring element 9, the operator can pass the connecting bolt through the threaded mounting hole 14 and then install it, which can effectively improve the convenience of assembly.

[0038] The width of the limiting groove 7 is equal to the width of the wiring element 9 and the width of the fixed part 112, so the two side walls of the limiting groove 7 form the limiting wall 8, which can limit and stop the rotation of the wiring element 9 and the fixed part 112, thereby ensuring the stability of the wiring element 9 and the conductive part 11 under the condition of using one connecting bolt. The two side walls of the limiting groove 7 are hollow structures, which can reduce the weight of the base 1 and the materials used to manufacture the base 1.

[0039] Referring to Figs. 1 and 2, Figure 8 and Figs. 3 and 4, Figure 9 The inner side of the protective cover 2 is provided with a mounting structure for mounting the fuse core 3, which includes two mounting rings 16 fixedly connected with the protective cover 2. One of the mounting rings 16 is provided with a supporting rod 17 away from the other mounting ring 16. The length direction of the supporting rod 17 is the same as that of the protective cover 2, and the end of the supporting rod 17 away from the mounting ring 16 connected therewith is fixedly provided with a stop block 18. After the fuse core 3 is inserted into the mounting ring 16 in the axial direction, the stop block 18 can be axially stopped with the fuse core 3, thereby axially positioning the fuse core 3 and preventing the fuse core 3 from falling off.

[0040] The protective cover 2 includes a main cover body and elastic plates 19 located at both sides of the main cover body in the width direction. The elastic plates 19 are each provided with a hemispherical clamping protrusion 20. The two side walls of the mounting groove 6 in the width direction are provided with clamping grooves 21 for clamping the clamping protrusions 20. When the protective cover 2 is assembled to the base 1, the protective cover 2 will be embedded into the mounting groove 6, and the clamping protrusions 20 will be clamped with the clamping grooves 21, thereby ensuring the stability of the protective cover 2.

[0041] The middle positions of both sides of the protective cover 2 in the width direction are provided with anti-slip grooves 22 for the operator to hold and operate. The corresponding positions of the two side walls of the mounting groove 6 in the width direction are provided with avoiding grooves 23 for avoiding the fingers of the operator, thereby facilitating the operator to hold and operate the protective cover 2 for installation and removal.

[0042] A through hole 24 is formed in the center of the main cover of the protective cover 2, the through hole 24 is a circular hole and faces the fuse core 3, and the operator can observe whether the fuse core 3 is installed through the through hole 24. Two rectangular pry holes 25 are also formed in the main cover, the pry holes 25 are arranged along the length direction of the main cover, and the pry holes 25 are close to the end positions of the length direction of the main cover. When the fuse fails, the protective cover 2 cannot be pulled out by hand, a screwdriver can be inserted into the pry hole 25 to pry the protective cover 2, so that the protective cover 2 is separated from the base 1.

[0043] In use, first, the fuse core 3 is installed into the mounting structure on the protective cover 2, then the protective cover 2 is buckled onto the mounting groove 6, and the conductive parts at both ends of the fuse core 3 will be inserted into the corresponding conductive members 11 and clamped by the clamping portions 111 of the conductive members 11, thereby forming good electrical contact, and finally, after the wires are fixed in the wiring elements 9, the fuse core 3 can be connected with the wires.

[0044] The small fuse does not separately provide a structure for fixing the conductive members 11, but uses the wiring elements 9 and the connecting structure for connecting the wiring elements 9 and the base 1 to fix the conductive members 11 and make the conductive members 11 conductive with the wiring elements 9, thereby effectively simplifying the structure of the small fuse and reducing the manufacturing cost of the small fuse.

[0045] In other embodiments, the protective cover can also have other forms. For example, in another embodiment, the protective cover is not connected to the base in a plug-in manner, but is hinged to the base, and the protective cover is buckled to the base by flipping. In another embodiment, only pry holes can be provided without through holes, and the positions of the pry holes are opposite to the positions of the fuse cores. The pry holes in this embodiment can also be used to observe the fuse cores. The number of pry holes can be one or three. In some embodiments, pry holes and through holes can not be provided.

[0046] The protective cover is provided to facilitate the installation of the fuse core and improve the anti-electric shock capability of the fuse, but when the protection of the base is good, the protective cover can not be provided. For example, in an embodiment, the mouth of the mounting groove is provided with a closing plate, and assembly holes for inserting the fuse core are formed in the two side walls of the length direction of the mounting groove, and the fuse core can be inserted into the mounting groove in the axial direction.

[0047] In other embodiments, the wiring element can also have other forms. For example, the wiring element is not provided with a connecting hole, and the connecting structure is a stud fixed on the wiring element, and the fitting hole is a light hole. When the wiring element is installed, the stud is inserted into the light hole, and a nut is installed on the stud on the side of the base away from the installation groove, so that the wiring element is fixedly connected with the base. In another embodiment, the hole diameter of the threaded mounting hole can be equal to or smaller than the hole diameter of the connecting hole. In this embodiment, the connecting bolt is installed in the connecting hole from the wiring hole, but a screwdriver can be used to install the connecting bolt through the threaded mounting hole. The threaded mounting hole can also be decentered from the connecting hole. In this embodiment, an L-shaped screwdriver can be used to install the connecting bolt into the wiring hole. In another embodiment, a separate operating hole and a threaded mounting hole can be provided on the side wall of the wiring element away from the connecting hole. The operating hole is coaxial with the connecting hole and is used to install the connecting bolt, and the threaded mounting hole is used to install the wiring bolt. In another embodiment, the wiring element can not be provided with a wiring bolt. In this embodiment, the wiring element is a plug-in wiring terminal. The plug-in wiring terminal is prior art and will not be described here.

[0048] In other embodiments, the base can not be provided with an installation groove. In this embodiment, the base is a plate-shaped structure, and the wiring element and the conductive piece are installed on the side of the base away from the clamping groove. The side of the base is provided with two pairs of limiting plates, the wiring element is arranged between the corresponding pair of limiting plates, and the wall of the limiting plate facing the wiring element constitutes a limiting wall. Alternatively, the limiting plate can also not be provided. In this embodiment, the protective cover is provided with a pin column, and the base is provided with a pin hole matched with the pin column, so as to install the protective cover.

[0049] Finally, it should be noted that the above description is only for the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments without creative labor, or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A miniature fuse, comprising a base, on which two wiring elements and two conductive elements are mounted, the conductive elements being electrically connected to their corresponding wiring elements, the conductive elements comprising a fixing part and a clamping part for clamping the fuse core, characterized in that, The fixing part is located between the wiring element and the base, and a connecting structure for fixing the wiring element and clamping the fixing part between the wiring element and the base is arranged between the wiring element and the base, the connecting structure comprises a connecting hole arranged on the wiring element, a corresponding matching hole corresponding to the connecting hole is arranged at a corresponding position of the base, and a connecting bolt for connecting the wiring element and the base is arranged in the connecting hole and the matching hole.

2. The small fuse of claim 1, wherein The connecting hole is a through hole, the matching hole is a threaded hole, the wiring element is provided with a wiring hole for the lead wire to pass through, the connecting hole is located on one side wall of the wiring element and communicates with the wiring hole, and an operating hole for mounting the connecting bolt is arranged on the side wall of the wiring element away from the connecting hole, the operating hole communicates with the wiring hole and is coaxial with the connecting hole.

3. The small fuse of claim 2, wherein The operating hole is a threaded mounting hole, and the threaded mounting hole is used to connect a wiring bolt for pressing the lead wire after the connecting bolt is mounted.

4. A small fuse according to any one of claims 1-3, characterised in that Two limiting walls are arranged on the base at each wiring element, and the two limiting walls are respectively located on the two sides of the wiring element, the width of the wiring element is equal to the distance between the corresponding two limiting walls.

5. The small fuse of claim 4, wherein The width of the fixing part is equal to the distance between the corresponding two limiting walls.

6. The small fuse of claim 4 wherein, The base is provided with a mounting groove for accommodating the fuse core, a limiting groove is arranged on the side wall of the mounting groove in the length direction, and the two side walls of the limiting groove respectively constitute limiting walls.

7. The small fuse of any one of claims 1 to 3, characterized in that The small fuse further comprises a protective cover capable of being buckled to the base, an inner side of the protective cover is provided with a fuse core mounting structure for mounting the fuse core, one of the protective cover and the base is provided with a clamping protrusion, and the other is provided with a clamping groove matched with the clamping protrusion.

8. The small fuse of claim 7, wherein An observation hole penetrating through the protective cover and opposite to the fuse core mounting structure is arranged on the protective cover.

9. The small fuse of claim 7 wherein, A prying hole for prying up the protective cover is arranged on the protective cover, and the prying hole is located at least one end of the protective cover in the length direction.

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