Rapid fuse with heat dissipation block

Abstract

A rapid fuse with heat dissipation blocks comprises an internal electrode, an external electrode, a fusion tube, a fuse body, a fuse body guide column, a heat dissipation block A, a heat dissipation block B, a fastening pin, arc extinguishing filler and a fastening screw. The fuse is composed of a plurality of fusion tubes which are arranged side by side and are mutually independently arranged on an external electrode, a certain heat dissipation space is reserved between adjacent fusion tubes, heat dissipation blocks are arranged at the two ends and in the middle of each fusion tube, and in order to improve the installation stability of the fuse and enhance the impact resistance and vibration resistance, an installation support is further arranged on the middle waist portion of each fusion tube. According to the utility model, the heat dissipation capability of the high-speed fuse when the high-speed fuse is installed and used in a narrow space is improved, the problems of poor impact resistance and vibration resistance of the fuse of the battery or capacitor protection system used in ships, rail transit and low-altitude aircrafts are solved, temperature rise and power consumption can be reduced without adding extra heat dissipation facilities or cooling equipment, and the service life of the high-speed fuse is prolonged. And stable operation in the system can be ensured, and reliable safety guarantee is provided for electric equipment.

Description

Technical Field

[0001] The utility model relates to a fuse for protecting electrical circuits or electrical equipment, and more specifically to a high-voltage DC fast fuse. Background Art

[0002] A fuse is an electrical appliance that melts and disconnects a circuit by generating heat itself when the current exceeds a specified value. When in use, the fuse is connected in series to the protected circuit. When an overload or short-circuit current passes through the fuse element, the fuse element will heat up and melt by itself, thus playing a certain protective role for the power system, various electrical equipment, and household appliances.

[0003] With the progress of power utilization technology, the transmission distance is getting longer and longer, resulting in higher transmission voltages and larger transmission currents. Especially in the field of direct current, electrical equipment and energy storage devices such as batteries and capacitors are also developing towards high voltage and large current. Considering environmental and cost factors, energy storage batteries or capacitors are also developing towards smaller volumes to reduce space occupation and environmental impact. For fuses used to provide overload and short-circuit protection for such equipment (systems), heat dissipation issues must be considered during long-term operation in a small space (even an enclosed space). Generally, the temperature rise is required not to exceed 130K, otherwise it will shorten the service life of the fuse or even cause misoperation, resulting in a short circuit in the line or the fuse melting when the overload or short-circuit current does not reach the designed fuse critical value. Currently, in the industry, to avoid this situation, generally, the larger the current, the thicker the fuse tube, so that the fuse has enough heat dissipation space (heat dissipation area) for heat dissipation. At the same time, on the premise of a larger fuse outer dimension, higher requirements are put forward for the welding and arrangement methods of the fuse element, as well as the material, size, and structure of the fuse tube. As a result, the arrangement density of the fuse element is getting larger, the difficulty is getting higher, heat dissipation is getting more difficult, and the manufacturing difficulty of the fuse tube is also getting larger and the cost is getting higher.

[0004] In addition, when multiple fuse elements are arranged in a concentric multi-turn manner in the inner cavity of a fuse tube, during normal use, due to the narrow heat dissipation space, heat dissipation is bound to be difficult, resulting in a higher temperature rise, increased power consumption, and shortened service life. To solve or overcome the problems of high temperature rise and high power consumption, the commonly used methods are: increasing the space around the fuse, installing cooling air conditioners in the electrical equipment area, etc.

[0005] All of the above have led to the current disadvantages of large current fuses, such as high material consumption, high cost, high manufacturing difficulty, complex processes, high usage and maintenance costs, and reduced safety protection performance. Summary of the Utility Model

[0006] In order to overcome the above deficiencies, the present utility model provides a fast fuse with heat dissipation blocks. This fuse is composed of a plurality of fuse tubes arranged side by side and independently installed on an external electrode. The fuse element is arranged in a plurality of independent fuse tubes, and a certain heat dissipation space is left between adjacent fuse tubes. Heat dissipation blocks are provided at both ends and the middle of the fuse tubes. And in order to improve the installation stability of the fuse and enhance the anti-impact and vibration resistance capabilities, an installation bracket is also provided in the middle waist of the fuse tube, thus forming an integral body. It not only improves the heat dissipation capacity of the fast fuse when installed and used in a narrow space, but also solves the problem of poor anti-impact and vibration resistance performance of the fuse used in the battery or capacitor protection systems of ships, rail transit, and low-altitude aircraft. Without the need to add additional heat dissipation facilities or cooling equipment, the temperature rise and power consumption can be reduced, ensuring stable operation in the system and providing reliable safety assurance for electrical equipment.

[0007] The present utility model achieves the above objectives through the following technical solutions:

[0008] 1. A fast fuse with heat dissipation blocks, including an internal electrode, an external electrode, a fuse tube, a fuse element, a fuse element guide post, heat dissipation block A and heat dissipation block B, fastening pins, arc extinguishing filler, and fastening screws; the internal electrode is installed and fixed at both ends of the fuse element guide post, and the fuse element is welded to the inner end face of the internal electrode. After the internal electrode welded with the fuse element passes through the fuse tube, it is fixed with fastening pins on the side faces at both ends of the fuse tube. The fuse tube with the fuse element sleeved inside passes through the installation through holes provided on the heat dissipation block, so that heat dissipation block B and heat dissipation block A are respectively installed and distributed at the middle waist and both ends of the fuse tube, and the external electrode is installed at the outer ends of the heat dissipation block A distributed at both ends of the fuse tube; it is characterized in that: the external electrode is connected to the internal electrodes installed on the outer end faces of a plurality of independent and parallel fuse tubes through fastening screws, and there is a gap for air flow left between each fuse tube.

[0009] 2. Fuse supports are installed on both sides of heat dissipation block B, and the bottom of the support is reversely flanged, so that the overall shape is L-shaped, and a support installation hole is provided at the bottom end of the L-shaped support, and the shape of the installation hole is kidney-shaped.

[0010] 3. A polygonal inward convex platform is provided at the middle part of the inner end face of the internal electrode, a circular recess for installing the fuse element guide post is provided at the center of the convex platform, and fixing glue is applied to the installation and connection part of the fuse element guide post and the internal electrode.

[0011] 4. The fuse element is provided with narrow diameters composed of a plurality of holes at intervals along the length direction. The adjacent narrow diameters are not in the same plane by means of flanging, and connection edges are provided at both ends of the fuse element.

[0012] 5. A fuse micro motion indicating device is installed on the outer end face at the middle part of the fuse.

[0013] 6. A mounting hole for connecting and fixing with an external circuit is provided in the middle of the outer end surface of the external electrode.

[0014] 7. An arc-proof and arc-extinguishing pad is provided between the contact surface of the internal electrode and the melting tube.

[0015] Compared with the prior art, the main advantages of the utility model are:

[0016] 1. Multiple parallel and independent fuse tubes are installed on an external electrode, so that the rated current that the line system needs to carry is borne by the fuses installed and arranged in multiple independent fuse tubes. A certain heat dissipation space is left between adjacent fuse tubes, and heat dissipation blocks are arranged at both ends and the middle of the fuse tube, which not only improves the heat dissipation effect of the fuse, but also reduces the thickness of the external conductive plate, which can reduce the material consumption and reduce the overall mass (weight) of the fuse; in this way, the temperature rise of the fuse during power-on operation is in a relatively low working condition, reducing power loss, which is beneficial to energy saving and saving operating costs, and can also extend the service life of the fuse.

[0017] 2. The melt is arranged in multiple independent melting tubes. Compared with the current use of one melting tube, the outer dimensions of a single melting tube are greatly reduced. Compared with the large tube, the manufacturing process, equipment and processing difficulty of the small tube are much lower, the yield (qualified rate) is relatively higher, and the manufacturing cost of the melting tube will also be reduced. In addition, it is not necessary to arrange multiple (multiple) melts that need to carry the rated current of the protected system in the inner cavity of a melting tube, which reduces the difficulty of melt arrangement installation, is conducive to improving work efficiency and quality control capabilities, and also increases the structural stability of the fuse, so that the vibration resistance and anti-bumping capabilities are improved.

[0018] 3. A bracket is installed at the waist of the fuse. Compared with the current process, the connection and fixing method of the fuse does not only rely on the external electrode to connect and fix the system. The added mounting bracket makes the connection and installation of the fuse more stable and firm. Whether it is used in rail transportation, ships, low-altitude aircraft, or IGBT, high-voltage battery packs, high-voltage supercapacitors and other equipment or systems, the anti-bumping, impact and vibration resistance will be further improved. The performance indicators will not only fully comply with the indicators specified in standards such as GJB150.16A-2009 and GJB150.18-1986, but will even be far better than the indicators specified in the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded schematic diagram of the components of the embodiment of the utility model.

[0020] Figure 2 It is a schematic diagram of the melt shape structure of an embodiment of the utility model.

[0021] Figure 3 This is a schematic diagram of the external structure of the embodiment of the utility model with a micro-motion indicating device.

[0022] Figure 4 This is a schematic diagram of the external structure of the embodiment of the utility model without a micro-motion indicating device.

[0023] Figure 5 This is a schematic diagram of the outer end face of the external electrode of the embodiment of the utility model.

[0024] Explanation of reference numerals: 1, fastening screw A; 2, fastening screw B; 3, external electrode; 4, internal electrode; 5, heat sink A; 6, bracket mounting screw; 7, bracket; 8, heat sink B; 9, auxiliary fuse; 10, micro-motion spring; 11, micro-motion bracket A; 12, micro-motion base; 13, micro-motion bracket fastening screw; 14, micro-motion switch; 15, insulating gasket; 16, micro-motion bracket B; 17, micro-motion indicating particle; 18, melt guide column; 19, fuse tube; 20, fastening pin; 21, melt; 22, arc extinguishing filler; 203, perforation of fuse tube sleeve; 204, bracket mounting hole; 205, micro-motion base mounting hole; 211, narrow diameter; 212, melt flange; 213, connecting edge; 301, external electrode mounting hole A; 302, external electrode mounting hole B; 303, external electrode mounting hole C. Detailed implementation manners

[0025] In order to further understand the inventive content, features and effects of the present utility model, the following embodiments and some installation steps are exemplified and described in detail with reference to the drawings as follows.

[0026] Embodiment, a fast fuse with a heat sink and a micro-motion indicating device, as Figure 1 , 3 , 5 shown, the present embodiment shows a high-current fast fuse with a four-fuse-tube structure, including fastening screw A1, fastening screw B2, external electrode 3, internal electrode 4, heat sink A5, bracket mounting screw 6, bracket 7, heat sink B8, auxiliary fuse 9, micro-motion spring 10, micro-motion bracket A11, micro-motion base 12, micro-motion bracket fastening screw 13, micro-motion switch 14, insulating gasket 15, micro-motion bracket B16, micro-motion indicating particle 17, melt guide column 18, fuse tube 19, fastening pin 20, melt 21, arc extinguishing filler 22, perforation of fuse tube sleeve 203, bracket mounting hole 204, micro-motion base mounting hole 205, external electrode mounting hole A301, external electrode mounting hole B302, external electrode mounting hole C303.

[0027] As shown in the attached Figure 1As shown, a polygonal protrusion is provided inwardly in the middle of the inner end face of the internal electrode 4, a circular depression (not shown in the figure) is provided at the center position of the polygonal protrusion, and a fixing glue (not shown in the figure) is applied to the depression position, and the two ends of the melt guide column 18 are respectively inserted into the circular depression position in the center of the inner end face of the internal electrode 4, so that the two are connected and fixed.

[0028] The connecting edges 213 at both ends of the melt 21 are connected to the side surfaces of the inner end polygonal protrusion of the internal electrode 4 by welding.

[0029] One end of the internal electrode 4, which has been welded with the melt 21 and installed with the melt guide pin 18, passes through the melting tube 19 in a sleeve-through manner, so that the melt 19 and the melt guide pin 18 are all sleeved in the inner cavity of the melting tube 19. The internal electrode 4 and the melting tube 19 are connected and fixed in a manner that the fastening pins 20 that are inserted into the melting tube 19 at the side of the edge positions (outermost positions) of the two ends of the melting tube 19 are used to connect and fix the internal electrode 4 to the melting tube 19.

[0030] The arc-extinguishing filler 22 is filled in the inner cavity of the melting tube 19 through the mounting hole (not shown in the figure) provided on the inner electrode 4 for connecting the inner electrode 4 with the outer electrode 3, and completely covers the melt 21 and the melt guide column 18 which are inserted into the inner cavity of the melting tube 19, so as to drive out the air which may remain in the inner cavity of the melting tube 19.

[0031] The melting tube 19 is passed through the melting tube sleeve through hole 203 provided on the heat sink B8 in a sleeve manner, so that the heat sink B8 is sleeved at the middle waist position of the melting tube 19;

[0032] The heat sink A5 is respectively put on both ends of the melting tube 19, and the external electrode 3 is buckled on. The fastening screws A1 and B2 are respectively passed through the external electrode mounting hole A301 and the external electrode mounting hole B302 set on the external electrode 3. The fastening screw A1 passing through the external electrode mounting hole A301 is inserted into the mounting hole reserved on the heat sink A5 (not marked in the figure) to connect and fix the two together; the fastening screw B2 passing through the external electrode mounting hole B302 and the mounting hole set on the internal electrode 4 (not marked in the figure) is connected and fixed to the external electrode 3 and the internal electrode 4 and the power circuit is turned on.

[0033] like Figure 2 As shown, the melt 21 is provided with a plurality of parallel holes at intervals along the length direction, and a narrow path 211 is formed between the holes. In order to stagger the arcing points at adjacent narrow paths and avoid forming a long arc, so as to improve the arc extinguishing ability, a melt fold 212 is provided between adjacent narrow paths along the length direction of the melt, and the adjacent narrow paths 211 are not in the same plane by folding; connecting edges 213 for welding to the internal electrode 4 are provided on both sides of the melt.

[0034] A micro-motion indicating pellet 17 and a micro-motion spring 10 are respectively sleeved through the central part of the auxiliary fuse link 9; both ends of the auxiliary fuse link 9 sleeved with the micro-motion indicating pellet 17 and the micro-motion spring 10 pass through the holes at the middle position of the micro-motion base mounting holes 205 provided on the heat dissipation block B8, and then pass through the mounting holes (not marked in the figure) for the micro-motion spring 10 provided at the corresponding positions of the fuse tube 19, penetrate into the inner cavity of the fuse tube 19, and then are respectively pulled out from the inner cavity of the fuse tube 19, pulling down and tightening the micro-motion indicating pellet 17 and the micro-motion spring 10 to make the top positions of the two flush with the outer end face of the heat dissipation block B8 (in one plane), and both ends of the auxiliary fuse link 9 are respectively fixed on the fastening screws 2 for connecting and fixing the internal connecting electrode 4 and the external connecting electrode 3.

[0035] The micro-motion bracket A11 is installed in a knob manner at both sides of the micro-motion base mounting holes 205 provided on the heat dissipation block B8, and the micro-motion bracket B16 is installed in a knob manner at the middle position of the micro-motion base mounting holes 205 provided on the heat dissipation block B8.

[0036] The micro-motion base 12 is connected and installed on the micro-motion bracket A11 through the micro-motion bracket fastening screw 13, and an insulating gasket 15 is padded between the two.

[0037] The micro-motion switch 14 is inserted and sleeved on the micro-motion base 12 in a plug-in card manner.

[0038] As Figure 1 、 Figure 3 shown, the bracket 7 is installed and fixed on the heat dissipation block B8 through the bracket mounting screw 6, passing through the mounting holes provided on the bracket 7 and then passing through the bracket mounting holes 204 provided on the heat dissipation block B8.

[0039] As Figure 5 shown, the external connecting electrode mounting hole C303 provided on the external connecting electrode 3 is used for connecting with the external circuit. When officially installed and used, the external circuit connects the fuse in series in the circuit through this mounting hole.

[0040] The above are the embodiments, installation methods and steps of the DC fast fuse with a micro-motion indicating device. If the installation position indicating device is not required, the accessory configuration and installation process omit the relevant spare parts and installation process of the micro-motion indicating device, and the finished product shape is as Figure 4 shown.

[0041] Of course, if the DC fast fuse designed by the present utility model is used in a relatively stable and fixed system, or restricted by the installation space, the installation link of the bracket 7 can also be omitted, and its line and equipment electrical system protection functions are not affected, but the stability is slightly worse.

[0042] The number of fuse tubes installed and connected on the contact in this embodiment is four. During actual use, according to the different rated voltages and currents of the circuits and equipment to be protected, the number of fuse tubes can be increased to 5, 6 or other numbers, or it can also be reduced to 3 or 2. In short, on the premise of meeting the requirements of the line load current usage, the design concept and design method are the same as those of this embodiment, all aiming to improve the heat dissipation capacity and heat dissipation effect, reduce the material usage of the external electrode and the internal electrode, the electrode processing difficulty, the production and installation difficulty of the fuse, improve the stability of the product quality and the production and processing work efficiency, further save the material usage and production cost, improve the working condition of the fuse during use, extend the service life of the fuse, decompose the large-current fuse composed of a single fuse tube into a parallel structure of multiple fuse tubes, leave a certain heat dissipation space between the parallel fuse tubes 19, and install heat dissipation blocks A5 and heat dissipation blocks B8 at the main part and both ends of the fuse tube 19 to further improve the heat dissipation speed and heat dissipation effect, improve the protection ability of the fuse, extend the service life, and at the same time, on the premise of meeting the requirement of the rated current passed by the protected electrical equipment, reduce the procurement cost and maintenance cost.

Claims

1. A fast fuse with heat dissipation blocks, comprising internal electrodes, external electrodes, a fuse tube, a fuse element, fuse element guide columns, heat dissipation block A and heat dissipation block B, fastening pins, arc extinguishing filler, and fastening screws; the internal electrodes are installed and fixed at both ends of the fuse element guide columns, the fuse element is welded to the inner end faces of the internal electrodes, after the internal electrodes welded with the fuse element pass through the fuse tube, they are fixed with fastening pins on the side faces at both ends of the fuse tube, the fuse tube with the fuse element sleeved inside passes through the installation sleeve holes provided on the heat dissipation blocks, so that the heat dissipation block B and the heat dissipation block A are respectively installed and distributed at the middle waist and both ends of the fuse tube, and the external electrodes are installed at the outer ends of the heat dissipation block A distributed at both ends of the fuse tube; characterized in that: The external electrode is connected to the internal electrode installed on the outer end faces of a plurality of independent and parallel fuse tubes through fastening screws, and there are gaps for air flow left between the fuse tubes.

2. The fast fuse with a heat sink according to claim 1, wherein: In the middle of the inner end face of the internal electrode, there is a polygonal inward convex platform, and in the center of the convex platform, there is a circular recess for installing the melt guide post. Fixing glue is applied to the installation connection part between the melt guide post and the internal electrode.

3. The fast fuse with a heat sink according to claim 1, characterized in that: The melt is provided with narrow diameters formed by a number of holes at intervals along the length direction. The narrow diameters are arranged in a way that adjacent narrow diameters are not in the same plane through flanging, and connecting edges are provided at both ends of the melt.

4. The fast fuse with a heat sink according to claim 1, characterized in that: In the middle of the outer end face of the external electrode, there is an installation hole for connecting and fixing with an external circuit.

5. The fast fuse with a heat sink according to claim 1, wherein: An arc-proof and arc-extinguishing pad is provided between the contact surfaces of the internal electrode and the fuse tube.

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