A fuse for PCB boards

Abstract

This application relates to the technical field of circuit protection, and in particular to a fuse for a PCB board. A fuse for a PCB board includes a fuse body and PCB copper lead assemblies disposed at both ends of the fuse body, the bottom of which is used for insertion into the PCB board. This application has the following advantages: the bottom of the PCB copper lead assembly is used for insertion into the PCB board, achieving the effect of convenient fuse installation on the PCB board. Compared with the traditional bolt fixing method, the insertion method requires no additional tools and is simpler to operate.

Description

Technical Field

[0001] This application relates to the technical field of circuit protection, and in particular to a fuse for PCB boards. Background Technology

[0002] A fuse is a current protection device that breaks the circuit by melting a fusible element due to the heat generated when the current exceeds a specified value for a certain period of time. Fuses protect electronic equipment from damage caused by overcurrent and can also prevent serious damage to electronic equipment caused by internal faults.

[0003] Tubular fuses are easy to replace and are widely used in electrical equipment. A tubular fuse is usually composed of a ceramic tube, metal cap electrodes and a fuse element. Two metal cap electrodes are fitted over both ends of the ceramic tube, and the fuse element is installed inside the ceramic tube. The two ends of the fuse element are welded to the center holes of the two metal cap electrodes respectively. When in use, the tubular fuse is mounted on the PCB board. Existing fuses are fixed to the PCB board with bolts, which is troublesome to install. Utility Model Content

[0004] To facilitate the mounting of the fuse on a PCB board, this application provides a fuse for use on a PCB board.

[0005] This application provides a fuse for a PCB board, which adopts the following technical solution: it includes a fuse body and PCB copper pin assemblies disposed at both ends of the fuse body, and the bottom of the PCB copper pin assemblies is used to insert into the PCB board.

[0006] By adopting the above technical solution, the bottom of the PCB copper pin assembly is used to insert into the PCB board, which achieves the effect of conveniently installing the fuse on the PCB board. Compared with the traditional bolt fixing method, the plug-in method does not require additional tools and is easier to operate.

[0007] Preferably, the PCB copper lead assembly includes a copper lead cover and a connecting piece. The copper lead cover is used to fit against the end face of the fuse body. The connecting piece is perpendicularly connected to the copper lead cover. The connecting pieces of both PCB copper lead assemblies extend towards the fuse body. The bottom of the connecting piece is used to insert into the PCB board.

[0008] By adopting the above technical solution, the connecting pieces of the two PCB copper foot assemblies extend towards the fuse body. This inward design can save space. The bottom of the connecting piece is used to insert into the PCB board. When installing, simply align the bottom of the connecting piece with the corresponding position on the PCB board and insert it.

[0009] Preferably, the PCB copper pin assembly further includes at least one insert, which is disposed perpendicular to the lower surface of the connecting piece at the bottom of the connecting piece, and is used to be inserted into a mounting hole opened on the PCB board.

[0010] By adopting the above technical solution, the insert is used to insert into the mounting hole opened on the PCB board. The design of the insert can enhance the stability of the connection and prevent the fuse from shaking or falling off during use.

[0011] Preferably, the fuse body includes a fuse tube and contact covers sleeved on both ends of the fuse tube. The fuse tube and the contact covers are detachably connected, and the end face of the contact cover away from the fuse tube is in contact with the copper foot cover.

[0012] Preferably, the fuse body further includes an inner cover for a contact cap, and an outer cover for a contact is coaxially sleeved on the inner cover for the contact cap. An annular groove is formed between the outer wall of the inner cover for the contact cap and the inner wall of the outer cover for the contact, so that an interference fit is formed between the outer cover for the contact and the wall of the fuse tube.

[0013] By adopting the above technical solution, the fusible tube and the outer cover of the contact can be tightly connected, ensuring the normal transmission of current.

[0014] Preferably, the fuse body further includes a molten element disposed within the fuse tube, and the two ends of the molten element are respectively connected to the inner caps of the two contact caps.

[0015] By adopting the above technical solution, the fuse tube is equipped with a fusible element to meet the functional requirements of the fuse.

[0016] Preferably, both ends of the melt have connecting ears extending perpendicular to the length direction of the melt, and a through hole is provided on the end face of the inner cover of the contact cap, through which the connecting ears pass and abut against the end face of the inner cover of the contact cap.

[0017] By adopting the above technical solution, the melt connecting lug passes through the hole and abuts against the inner end face of the contact cap, increasing the contact area between the melt and the outer cover of the contact and the inner cover of the contact cap, thereby improving the stability of the melt placement.

[0018] Preferably, there are four melts arranged in a rectangular pattern within the melt tube.

[0019] By adopting the above technical solution, the parallel connection of four fuses significantly increases the total current-carrying cross-sectional area, which not only meets the protection requirements of high-current circuits on the PCB, but also meets customer needs. The rectangular symmetrical arrangement helps the current to be evenly distributed among the four fuses, reducing the risk of hot spots and stabilizing the fuse characteristics.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. The bottom of the PCB copper pin assembly is used to insert it onto the PCB board, which facilitates the installation of the fuse on the PCB board. Compared with the traditional bolt fixing method, the plug-in method does not require additional tools and is easier to operate. 2. The connecting pieces of the two PCB copper pin assemblies extend towards the fuse body. This inward design saves space. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a cross-sectional view of the overall structure of this application; Figure 3 This is a partial schematic diagram of the structure of this application.

[0022] Explanation of reference numerals in the attached drawings: 110, fuse body; 111, fuse tube; 112, inner cover of contact cap; 113, outer cover of contact; 114, fusible element; 115, annular groove; 116, through hole; 117, connecting lug; 118, tin-plated fuse piece; 120, PCB copper lead assembly; 121, outer cover of copper lead; 122, connecting piece; 123, insert. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings.

[0024] This application discloses a fuse for PCB boards, which facilitates the mounting of the fuse on the PCB board.

[0025] refer to Figures 1-3 A fuse for a PCB board includes a fuse body 110 and PCB copper foot assemblies 120 disposed at both ends of the fuse body 110. The bottom of the PCB copper foot assembly 120 is used to insert into the PCB board, which achieves the effect of conveniently installing the fuse on the PCB board. Compared with the traditional bolt fixing method, the plug-in method does not require additional tools and is easier to operate.

[0026] Specifically, the PCB copper lead assembly 120 includes a copper lead cover 121, a connecting piece 122, and at least one insert 123. In this embodiment, the copper lead cover 121 is circular in shape to fit the end face of the fuse body 110. The copper lead cover 121 is used to fit against the end face of the fuse body 110, serving to protect and fix the connection. The connecting piece 122 is vertically connected to the copper lead cover 121 and is connected together by welding or integral molding. The connecting pieces 122 of the two PCB copper lead assemblies 120 extend towards the fuse body 110. This inward design can save space. The bottom of the connecting piece 122 is used to insert into the PCB board. When installing, simply align the bottom of the connecting piece 122 with the corresponding position on the PCB board and insert it.

[0027] In this embodiment, each PCB copper pin assembly 120 includes two inserts 123, which are symmetrically arranged on both sides of the connecting piece 122. Both inserts 123 are perpendicular to the lower surface of the connecting piece 122 and positioned at the bottom of the connecting piece 122. The inserts 123 are used to insert into mounting holes opened on the PCB board. The design of the inserts 123 enhances the stability of the connection, preventing the fuse from shaking or falling off during use. The inserts 123 and the connecting piece 122 can be connected by soldering or integrally formed during manufacturing.

[0028] In addition, the fuse body 110 includes a fuse tube 111, an inner cover 112 of the contact cap, an outer cover 113 of the contacts sleeved at both ends of the fuse tube 111, and a fuse element 114 disposed inside the fuse tube 111. The fuse tube 111 and the outer cover 113 of the contacts are detachably connected. The end face of the outer cover 113 away from the fuse tube 111 is in contact with the outer cover 121 of the copper foot. The outer cover 113 of the contacts is coaxially sleeved on the inner cover 112 of the contact cap. An annular groove 115 is formed between the outer wall of the inner cover 112 of the contact cap and the inner wall of the outer cover 113 of the contacts. The tube wall of the fuse tube 111 is used to insert into the annular groove 115, so that the fuse tube 111 and the outer cover 113 of the contacts can be tightly connected to ensure the normal transmission of current.

[0029] Furthermore, the two ends of the fusible element 114 are respectively connected to the inner covers 112 of the two contact caps. The fusible element 114 is provided inside the fuse tube 111 to meet the functional requirements of the fuse. Both ends of the fusible element 114 have connecting ears 117 extending perpendicularly to the length direction of the fusible element 114. A through hole 116 is opened on the end face of the inner cover 112 of the contact cap. The connecting ears 117 pass through the through holes and abut against the end face of the inner cover 112 of the contact cap. The connecting ears 117 of the fusible element 114 pass through the holes and abut against the end face of the inner cover 112 of the contact cap, increasing the connection between the fusible element 114 and the contacts. The contact area of ​​the outer cover 113 and the inner cover 112 of the contact cap improves the stability of the placement of the molten element 114. In this embodiment, four molten elements 114 are provided, which are distributed in a rectangular shape in the molten tube 111. A molten sheet tinned 118 is also provided in the middle of the opposite side wall of each molten element 114. The parallel connection of the four molten elements 114 significantly increases the total current-carrying cross-sectional area, which meets the protection requirements of high current circuits on the PCB. The rectangular symmetrical arrangement helps the current to be evenly distributed among the four molten elements 114, reduces the risk of hot spots, and stabilizes the melting characteristics.

[0030] The implementation principle of a fuse for PCB board according to an embodiment of this application is as follows: by designing the bottom of the PCB copper foot assembly 120 to be pluggable to the PCB board, the traditional bolt fixing method is changed, which greatly simplifies the installation process and improves the installation efficiency; at the same time, the reasonable design and connection method between the components of the fuse body 110 ensures the normal operation and reliability of the fuse. Compared with the prior art, it has significantly improved in terms of installation convenience and performance.

[0031] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fuse for a PCB board, comprising a fuse body (110) and PCB copper lead assemblies (120) disposed at both ends of the fuse body (110), characterized in that: The bottom of the PCB copper pin assembly (120) is used for insertion onto the PCB board; The PCB copper lead assembly (120) includes a copper lead cover (121) and a connecting piece (122). The copper lead cover (121) is used to fit against the end face of the fuse body (110). The connecting piece (122) is perpendicularly connected to the copper lead cover (121). The connecting pieces (122) of the two PCB copper lead assemblies (120) extend towards the fuse body (110). The bottom of the connecting piece (122) is used to insert into the PCB board.

2. A fuse for a PCB board according to claim 1, characterized in that: The PCB copper foot assembly (120) also includes at least one insert (123), the insert (123) is disposed at the bottom of the connecting piece (122) perpendicular to the lower surface of the connecting piece (122), and the insert (123) is used to be inserted into the mounting hole opened on the PCB board.

3. A fuse for a PCB board according to claim 1, characterized in that: The fuse body (110) includes a fuse tube (111) and contact covers (113) sleeved on both ends of the fuse tube (111). The fuse tube (111) and the contact covers (113) are detachably connected. The end face of the contact cover (113) away from the fuse tube (111) is in contact with the copper foot cover (121).

4. A fuse for a PCB board according to claim 3, characterized in that: The fuse body (110) also includes an inner cover (112) of the contact cap, and an outer cover (113) of the contact is coaxially sleeved on the inner cover (112). An annular groove (115) is formed between the outer wall of the inner cover (112) of the contact cap and the inner wall of the outer cover (113) of the contact, so that an interference fit is formed between the outer cover (113) of the contact and the tube wall of the fuse tube (111).

5. A fuse for a PCB board according to claim 4, characterized in that: The fuse body (110) also includes a molten element (114) disposed in the fuse tube (111), and the two ends of the molten element (114) are respectively connected to the inner covers (112) of the two contact caps.

6. A fuse for a PCB board according to claim 5, characterized in that: Both ends of the melt (114) have connecting ears (117) extending perpendicular to the length direction of the melt (114). A through hole (116) is provided on the end face of the inner cover of the contact cap (112). The connecting ear (117) passes through the through hole (116) and abuts against the end face of the inner cover of the contact cap (112).

7. A fuse for a PCB board according to claim 5, characterized in that: Four melts (114) are provided, and the four melts (114) are rectangularly distributed in the melt tube (111).

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