CN219497712U - Heavy-current fuse with multiple fusion tube structure - Google Patents

Abstract

The large-current fuse with the multi-fusion-tube structure is composed of a plurality of fusion tubes which are independent and parallel, and gaps are reserved between the fusion tubes, a plurality of melts which are installed according to rated current are respectively and evenly distributed in each fusion tube, the fusion tubes are jointly installed on one contact to form a whole, so that the material cost can be saved, the production procedure is reduced, the manufacturing difficulty is reduced, meanwhile, the temperature rise and the power consumption of the fuse are reduced under the condition that the installation space is not required to be increased and additional heat dissipation facilities or cooling equipment are not required to be added in the operation process, the stable operation on a circuit can be ensured, reliable safety protection is provided for electric equipment, and the fuse can be widely applied to the electric equipment protection aspects in the fields of medium and large energy storage power station battery packs, IGBT (insulated gate bipolar transistor), aerospace craft, civil ships and military ships, rail transit, photovoltaic power generation, wind power generation, electric power lines and the like.

Description

Heavy-current fuse with multiple fusion tube structure

Technical field:

the utility model relates to a fuse for protecting an electric circuit or electric equipment, in particular to a multi-fusion tube structure high-current fuse.

Background

When the current exceeds the specified value, the fuse is connected in series in the protected circuit by the heat generated by the fuse, and when overload or short-circuit current passes through the fuse, the fuse generates heat to fuse, so that the fuse has a certain protection effect on a power system, various electrical equipment and household appliances.

Along with the progress of the electricity utilization technology, the transmission distance is further and further increased, the transmission voltage is higher and the transmission current is higher and further increased, and the electric equipment is also developed towards the high voltage and high current direction, but in the aspect of providing overload and short-circuit protection for the electric equipment, because the production and manufacture of the high-current fuse are required to arrange a plurality of melts in one fusion tube so as to meet the requirement of high current, the larger the current is, the larger the outline dimension of the fuse is, so that the welding and arrangement modes of the melts and the material, the size and the structural mode of the fusion tube are provided with higher requirements, the arrangement density of the melts is higher and higher, the heat dissipation difficulty is higher and higher, the manufacture difficulty of the fusion tube is higher and higher the cost is.

The conventional circular tube type heavy-current fuse is required to be provided with a plurality of melts in a single-layer mode in the inner cavity of the melting tube, so that the conductive contacts or the areas for welding and connecting the melts are required to be large enough, and the outline size of the fuse is required to be large enough; or as shown in fig. 2 and 3, multiple layers of melt are arranged in concentric circles in the inner cavity of the melting pipe 101, so that 1021 of the welding position of the contact 102 is required to be manufactured into multiple steps for arranging the melt, and the thickness of the contact 102 is required to be increased.

In addition, as the contact of the circular tube type heavy current fuse shown in fig. 2 and 3 is sleeved in the inner cavity of the fusion tube 101, in order to firmly connect the contact 102 with the fusion tube 101, in addition to the need of applying sealant at the sleeving part of the contact and the fusion tube 101, the outer circular side surfaces of the wall of the fusion tube 101 and the contact 102 need to be perforated for sleeving pins so as to firmly connect the contact, so that the thickness of the contact 102 needs to be increased in order to leave a position 1022 for sleeving pin holes. Such contacts are relatively thick and therefore use a relatively large amount of material.

In addition, since the thickness of the melt material for the fuse is very thin (generally, not more than 3 mm), in order to maintain the parallelism of the two ends of the contacts 102 during the process of welding the melt and the subsequent installation process of the sleeve-penetrating fusion pipe, and not to damage the welded melt (breaking, deforming, twisting and folding, etc.), a special tool and a clamp are required, and a melt guide post (also called a support rod) 103 is installed at the center position while maintaining the spacing and parallelism of the two ends of the contacts 102.

In addition, the plurality of melts are distributed in the inner cavity of the melting pipe in a concentric circle mode, and in the normal use process, heat dissipation is difficult due to the narrow heat dissipation space, temperature rise is high, power consumption is increased, and the service life is shortened. In order to solve or overcome the problems of high temperature rise and high power consumption, the following methods are generally adopted: the space around the fuse is enlarged, heat dissipation facilities (heat dissipation fins and cooling water sleeves) are added on the fuse tube body, and cooling air conditioners are arranged in the electric appliance facilities.

The defects of high cost, high manufacturing difficulty, complex process, high use maintenance cost and reduced safety protection performance of the conventional high-current fuse material are caused by the various problems.

Disclosure of Invention

In order to overcome the defects, the utility model provides the multi-fusion-tube-structure heavy-current fuse which does not need to arrange a plurality of melts in one fusion tube, but arranges the melts in a plurality of independent fusion tubes, a certain heat dissipation space is reserved between the adjacent fusion tubes, and a heat dissipation sheet is arranged on the fusion tubes, and the fusion tubes are jointly arranged on one contact to form a whole, so that the material cost can be saved, the production procedure is reduced, the manufacturing difficulty is reduced, meanwhile, the temperature rise and the power consumption of the fuse are reduced under the condition that the installation space is not required to be increased, and additional heat dissipation facilities or cooling equipment are not required to be added in the operation process, the stable operation on a circuit can be ensured, the reliable safety guarantee is provided for electric equipment, and the fuse can be widely applied to the protection aspects of electric equipment in the fields of heavy-current battery packs, IGBTs, aerospace aircrafts, civil ships and military ships, rail traffic, photovoltaic power generation, wind power generation, power lines and the like.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

1. the high-current fuse with the multi-fusion tube structure comprises an upper contact, a lower contact, a fusion tube, a melt, an upper cover, a lower cover, fastening screws, arc extinguishing fillers and sealing plugs, wherein the fusion tube is arranged between the upper contact and the lower contact, the melt passes through the fusion tube and is welded on the outer edge of the contact, and the upper cover and the lower cover are arranged on the contact by the fastening screws; the method is characterized in that: the plurality of independent parallel fusion pipes are jointly installed and connected on one contact, and gaps for air flow are reserved among the fusion pipes.

2. Holes corresponding to the inner cavities of the melting pipes, used for penetrating through the melt, a welding platform used for welding the arranging melt and a mounting hole connected with an external circuit through bolts are formed in the upper contact and the lower contact; the shape of the contact includes circular, rectangular, triangular and polygonal.

3. The outer wall of the fusion tube is provided with cooling fins, the inner side of the fusion tube is provided with reinforcing ribs, the connection parts of the two ends of the fusion tube and the contacts are provided with fastening screw perforations with internal threads, and the shape of the fusion tube comprises a rectangle, a polygon and a circle.

4. And the upper cover is provided with a filling hole for filling arc extinguishing filler.

5. And the upper cover and the lower cover are provided with mounting and positioning limiting clamping angles.

6. The melt is provided with narrow diameters consisting of a plurality of holes at equal intervals along the length direction, two ends of the melt are provided with connecting edges, and the angle of the connecting edges is 90 degrees with the melt.

Because the fuse is designed by independently and parallelly combining a plurality of fusion pipes, melts required to bear rated current and provided with the cloth rows are respectively arranged in each independent fusion pipe, the plurality of fusion pipes are jointly connected and installed on one contact (conductive plate), and a space for air to flow and dissipate heat is reserved between the adjacent fusion pipes, on one hand, the thickness of the contact can be reduced, the material consumption of the contact can be reduced, and the whole mass (weight) of the fuse can be reduced; on the other hand, the melt is arranged in the plurality of melting pipes, so that the density of the melt arranged in the melting pipes is reduced, the influence of mutual interference between adjacent melts in each melting pipe is reduced (such as the probability of arcing and arc crossing during fusing), the heating temperature of the melt is not too high, and gaps are reserved between the adjacent melting pipes, thereby facilitating air flow to promote heat dissipation and cooling; in addition, the heat radiating fins are arranged on the outer wall of the melting tube, so that the heat of the fuse is further radiated, the temperature rise of the fuse in the electrifying work is in a relatively low working condition, the power loss is reduced, the energy conservation and the running cost saving are facilitated, and the service life of the fuse can be prolonged.

And the melts respectively penetrate through the inner cavities of the respective melting pipes and are welded on the outer edges of the contacts, compared with the prior welding on the inner sides of the contacts, the welding positions are not required to be manufactured into different lengths, one size is unified, the welding is convenient, the interchangeability is improved, the self resistance difference of each melt is further reduced, the production and processing difficulty is also reduced, and the welding quality and the production efficiency are improved.

In addition, because the melt passes through the melting pipe directly to be welded on the outer edge of the contact, compared with the prior art, special tools and clamps are not needed to be manufactured and used, and a melt guide post is arranged between the contacts at the two ends, so that the production process is reduced, materials are saved, and the product cost can be further reduced.

In addition, the fusion tube is connected and fixed with the contacts at the two ends through the fastening screw instead of sleeving the contacts in the fusion tube, so that the process of punching holes on the contacts and the fusion tube and then riveting by using pins to penetrate into the fusion tube is omitted, the production process is further reduced, the materials are saved, and the product cost can be further reduced.

Compared with the prior art, the fuse provided by the design of the utility model is formed by a plurality of fusion pipes, the external dimension of the pipe body of the single fusion pipe is certainly greatly reduced, the manufacturing process, the using equipment and the processing difficulty of the small pipe body are much lower than those of the large pipe body, the yield (qualification rate) is relatively higher, and the manufacturing cost of the fusion pipe is also reduced.

The plurality of fusion pipes are jointly connected and installed on one contact, and in actual use, the connection resistance between the outer cover and the connecting bolt and between the connecting bolt and the electric equipment is reduced, so that the temperature rise and the power consumption of a circuit are reduced.

In the processing and manufacturing mode of the contact, the existing contact is to cut a metal block (a red copper block or a brass block), then gradually process the inner wall of the contact into a stepped multi-layer round edge (or multiple edges) by cutting, edging and the like, so as to be used for welding melt, and then punch holes on the outer surface so as to be used for connecting with external circuits or electric equipment; the side surface is perforated for penetrating the pin and is firmly connected with the fusion tube after being sleeved in the fusion tube. The contact for installing and connecting a plurality of fusion pipes designed by the utility model is formed by cutting a thinner metal sheet (a copper block or a brass block) and directly pressing the metal sheet on a shaping die at one time in a processing and manufacturing mode, so that the material consumption is greatly reduced, the processing technology is simplified, the production efficiency is improved, and the surface quality of a product is also improved.

Drawings

FIG. 1 is an exploded view of the components of an embodiment of the present utility model.

Fig. 2 is a schematic view of the appearance and structure of a conventional breaker.

Fig. 3 is a schematic diagram of the internal structure of the fuse contact of the prior structure and the connection and fixation modes of the contacts at two ends.

Fig. 4 is a schematic view of the appearance structure of a contact according to an embodiment of the present utility model.

FIG. 5 is a schematic view showing the appearance and structure of a fusion pipe according to an embodiment of the present utility model.

Fig. 6 is a schematic view of an external structure of an upper cover according to an embodiment of the utility model.

Reference numerals illustrate: 1. an upper contact; 2. a fusion pipe; 3. a lower contact; 4. a melt; 5. an upper cover; 6. a lower cover; 7. a fastening screw; 8. arc extinguishing filler; 9. a sealing plug; 11. punching a screw; 12. a melt welding platform; 13. a mounting hole; 14. perforating the melt; 21. a contact mounting hole; 22. reinforcing ribs; 23. a heat sink; 51. a cover plate mounting hole; 52. arc extinguishing filler fills the hole; 53. positioning the clamping angle; 101. a fusion pipe; 102. a contact; 1021. a melt welding station; 1022. the pin is perforated.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

An embodiment, as shown in fig. 1, 4, 5 and 6, the embodiment illustrates a high-current fuse with a 4-fusion tube structure, which comprises an upper contact 1, a fusion tube 2, a lower contact 3, a melt 4, an upper cover 5, a lower cover 6, a fastening screw 7, an arc extinguishing filler 8 and a sealing plug 9. The upper contact 1 and the lower contact 2 are respectively arranged at two ends of the fusion pipe 2, melts are respectively sleeved in the 4 fusion pipes 2 with identical external dimensions and structures (the melt distribution is as even as possible, the number of the sleeved melts 4 in each fusion pipe is kept the same), the folded edges at the two ends penetrate out of the melt perforation 14 of the fusion pipe 2 and the upper and lower contacts 1 and 3, the folded edges at the two ends of the melt 4 are welded at the melt welding platform 12 at the outer edges of the upper and lower contacts 1 and 3, and the upper cover 5 and the lower cover 6 are covered at the melt perforation 14 of the contacts 1 and 3; the fastening screw 7 passes through the cover plate mounting holes 15 (not labeled on the lower cover diagram) on the upper cover and the lower cover, then passes through the screw through holes 11 on the upper contact 1 and the lower contact 3, plugs the melt through holes 14, and screws into the contact mounting holes 21 on the fusion tube 2, so that the fusion tube 2, the upper contact 1, the lower contact 3, the upper cover 5 and the lower cover 6 are connected and combined into a whole; the arc extinguishing filler 8 is filled into the inner cavity of the fuse tube 2 through an arc extinguishing filler filling hole 52 arranged on the upper cover 5, and the sealing cover 9 is riveted on the arc extinguishing filler filling hole 52 in a riveting mode, so that the inner cavity of the whole fuse tube 2 forms a sealing body.

As shown in fig. 1 and 5, the outer wall of the melting tube 2 is provided with the cooling fins 23, so that the external three-dimensional area of the melting tube 2 is increased, the fuse can be accelerated to be in a working state, and the heat required to be released by the temperature rise of the melt 4 is conducted to the inner wall of the melting tube 2 and then conducted to the cooling fins 23 on the outer wall due to the electrifying, so that the heat release speed is accelerated; the reinforcing ribs 22 arranged around the inner wall of the fusion pipe 2 can increase the strength of the fusion pipe 2 and are not easy to deform or damage.

As shown in fig. 1 and 6, the upper cover 5 and the lower cover 6 are provided with positioning clamping angles 53 (not shown in the lower cover 6), so that the mounting position and angle errors can be prevented during mounting, the possibility that the arc extinguishing filler 8 leaks from a gap between the upper cover and the lower cover due to incorrect positions and the melt perforation 14 on the contacts 1 and 3 cannot be completely blocked after mounting is avoided, and air enters into a fusing cavity from the gap is avoided, so that the arc extinguishing capability of the fuse is reduced.

When in installation and use, the connecting bolts penetrate into the installation holes 13 arranged on the outer surfaces of the upper contact 1 and the lower contact 3, and are screwed up by using a torque wrench, so that the fuse is firmly and stably connected in series on a wire, and can be normally used after being electrified.

The melt is scattered and arranged in a plurality of melting pipes and welded at a welding platform on the outer surface of the contact, compared with the prior welding of the melt in the contact, the melt is not required to be manufactured into different lengths according to different welding positions, so that the technical parameters of the melt such as the external dimensions such as the length and the narrow diameter are the same, the difference of the self resistance values of the melt is reduced to a negligible degree, and the relative parameters of processing equipment can be adjusted once because the sizes are consistent, the processing and manufacturing are completed once, the repeated adjustment of the parameters of the equipment is not required, the repeated processing is performed, the production efficiency is improved, and meanwhile, the interchangeability of the melt is also improved.

The number of the fusion pipes installed and connected on the contacts is 4, and in the actual use process, the number of the fusion pipes can be increased to 5, 6 or other numbers according to different rated voltages and currents of circuits and equipment to be protected, and can be reduced to 3 or 2, so that the use requirement of the circuit load current is met. However, the design concept and the design manner are the same as those of the embodiment, so that the thickness of the contact and the processing difficulty of the contact and the production and installation difficulty of the fuse are reduced, the production procedures, the material consumption and the number of accessories are reduced, the stability of the product quality and the production and processing work efficiency are improved, the material consumption and the production cost are further saved, the working condition of the using link of the fuse is improved, the service life of the fuse is prolonged, the existing heavy-current fuse consisting of one fuse tube is decomposed into a plurality of fuse tube parallel structures, and the purchase cost and the maintenance cost are reduced on the premise of meeting the requirement of rated current passed by protected electric equipment.

The foregoing description is only one embodiment of the present utility model and is not intended to limit the utility model, and any modifications, equivalents, improvements, etc. made within the design concept of the present utility model should be included in the scope of the utility model.

Claims (6)

1. The high-current fuse with the multi-fusion tube structure comprises an upper contact, a lower contact, a fusion tube, a melt, an upper cover, a lower cover, fastening screws, arc extinguishing fillers and sealing plugs, wherein the fusion tube is arranged between the upper contact and the lower contact, the melt passes through the fusion tube and is welded on the outer edge of the contact, and the upper cover and the lower cover are arranged on the contact by the fastening screws; the method is characterized in that: the plurality of independent parallel melting pipes are jointly installed and connected on one contact, and gaps for air flow are reserved among the melting pipes.

2. The multi-fuse tube structure high-current fuse of claim 1, wherein: holes corresponding to the inner cavities of the melting pipes, used for penetrating through the melt, a welding platform used for welding the arranging melt and a mounting hole connected with an external circuit through bolts are formed in the upper contact and the lower contact; the shape of the contact includes circular, rectangular, triangular and polygonal.

3. The multi-fuse tube structure high-current fuse of claim 1, wherein: the outer wall of the fusion tube is provided with cooling fins, the inner side of the fusion tube is provided with reinforcing ribs, the connection parts of the two ends of the fusion tube and the contacts are provided with fastening screw perforations with internal threads, and the shape of the fusion tube comprises a rectangle, a polygon and a circle.

4. The multi-fuse tube structure high-current fuse of claim 1, wherein: and the upper cover is provided with a filling hole for filling arc extinguishing filler.

5. The multi-fuse tube structure high-current fuse of claim 1, wherein: and the upper cover and the lower cover are provided with mounting and positioning limiting clamping angles.

6. The multi-fuse tube structure high-current fuse of claim 1, wherein: the melt is provided with narrow diameters consisting of a plurality of holes at equal intervals along the length direction, two ends of the melt are provided with connecting edges, and the angle of the connecting edges is 90 degrees with the melt.