CN216957949U - Novel structure spiral fuse base and fuse-link's connection structure - Google Patents

Abstract

The novel structure screw type fuse base and fuse body connecting structure has the advantages that the fuse base shell of the structure is changed from porcelain to metal, a layer of engineering plastic with good insulating property is additionally arranged in the shell, the anti-loosening module is changed into a spring type, the strength of the base is enhanced, the creepage distance is increased, and the damage of an electroplated layer caused by the friction of the anti-loosening module on a fuse body contact is reduced; the fuse tube of the fuse link is made of plastic, the fuse link is provided with a variable cross section, a certain angle of bending is formed along the length direction, the arcing angle is staggered, the forming parts at two ends are changed into telescopic L-shaped, the vibration resistance and impact resistance are improved, the structure is more stable, the service life can be prolonged, the breaking capacity is improved, and the fuse link can be applied to the protection of electric equipment in the fields of road vehicles, civil ships, military ships, machine tools/lathes, rail traffic, aviation/aerospace launching devices and the like in a non-static state.

Description

Novel structure spiral fuse base and fuse-link's connection structure

The technical field is as follows:

the utility model relates to the field of protection of power transmission lines and electric equipment, in particular to a spiral fuse base and a fuse link for protecting the power transmission lines and the electric equipment.

Background

The fuse is an electric appliance which fuses and breaks a circuit by heat generated by the fuse when the current exceeds a specified value, and when the fuse is used, the fuse is connected in series in a protected circuit, and when overload or short-circuit current passes through the fuse, the fuse is heated and fused, so that a power system, electric equipment and various electrical equipment are protected to a certain extent. The fuse has the inverse time delay characteristic, and when the overload current is small, the fusing time is long; when the overload current is large, the fusing time is short. Therefore, the fuse can not be fused and can be continuously used until the current returns to normal within a certain overload current range.

The spiral fuse in the fuse generally comprises a porcelain cap, a fuse tube, a porcelain bushing, an upper connection base, a lower connection base, a porcelain base and the like, is a fuse with a melt, wherein a fuse carrier is screwed into the base by virtue of threads to be fixed on the base, has the characteristics of large breaking capacity, small volume, capability of displaying after the melt is fused, convenience in melt replacement, safety, reliability and the like, is widely applied to distribution boxes, control boxes and occasions with large vibration in electrical control systems of equipment such as low-voltage distribution equipment, ships, machine tools and the like, and is used as an overload and short-circuit protection element.

The screw threads (threaded pipes) arranged in the upper cap (upper end) and the lower seat (lower end) of the existing common screw-type fuse base are used for fixing the fuse link, so that the fuse link arranged in the screw-type fuse base can be tightly and reliably connected with the wiring ends (load ends) at the upper end and the lower end, the materials of the threaded pipes are all pure metals (the materials of copper and steel are more), the threaded pipes are communicated with the load end of a circuit, and the circuit is reliably and stably communicated with the fuse link, in order to make the fuse link conductive cloth (contact) arranged in the base be better connected with the conductive end arranged on the base and reduce the contact resistance, the bottom end of the lower cap of the base is provided with a locking module with certain elasticity, the currently commonly adopted locking module is integrated into a V-shaped card, the V-shaped opening is reduced after the fuse link is pressed down, and the opening of the V is expanded when no fuse link is pressed down; the fuse tube used by the fuse link is the same as the outside of the base and is made of porcelain. The spiral fuse made of the material and adopting the structure mode has the defects discovered at present through the use of more occasions:

1. the upper cap and the lower seat are connected by the thread screwed in material which is pure metal and are in direct contact with a fuse tube of a fuse link arranged in a porcelain bushing, thus having influence on electrical indexes such as insulation resistance, electrical intermittence, creepage distance and the like, and when the fuse link is used in an environment with low requirements on low voltage, small current, low breaking, short-time current tolerance and the like, the fuse link can meet the requirements, but cannot be applied in an environment with higher requirements on the indexes, and the breaking capacity of the fuse link can not be improved by simply increasing the current density flowing through the fuse link under the condition of not increasing the external dimension of a tube body and the dimension or the quantity of the fuse link in the fuse link. This results in a series of defects such as difficulty in heat dissipation, temperature rise, power consumption, etc. of the fuse link, and other substitute products must be found or the volume thereof must be increased.

2. The fuse tube of the fuse link and the exterior materials of the upper cap and the lower seat are porcelain, because the intrinsic characteristics of the materials determine that when the fuse link is used in the places/environments of inclination, swing, jolt, impact and vibration, the stability and reliability are greatly reduced.

3. The anti-loosening module is in a card type, when the fuse link is installed on the module with the structure and enters the running and using process, because the protected system (equipment) is not in a static state, an electroplated layer of a fuse link contact (outer cover) is easily damaged, and the quality indexes such as temperature rise and current carrying capacity are reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects, the utility model aims to provide a spiral fuse base and a fuse link with a novel structure, wherein the shell of the fuse base with the structure is changed from porcelain to metal, a layer of engineering plastic with good insulating property is additionally arranged in the shell, and a locking module is changed into a spring type, so that the strength of the base is enhanced, the creepage distance is increased, and the damage of an electroplated layer caused by the friction of the locking module on a contact of the fuse link is reduced; the fuse tube of the fuse link is made of plastic, the fuse link is set to be a variable cross section, a certain angle of bending is formed along the length direction, the arcing angle is staggered, the forming parts at two ends are changed into telescopic L-shaped, the vibration resistance and impact resistance are improved, the structure is more stable, the service life can be prolonged, the breaking capacity is improved, and the fuse link can be applied to the protection of electric equipment in the fields of non-static states, such as road vehicles, civil ships, military ships, machine tools/lathes, rail transit, aviation/aerospace launching devices and the like.

In order to achieve the purpose, the utility model provides the following technical scheme:

1. the novel structure connecting structure of the spiral fuse base and the fuse link comprises a base ferrule, a base inner ring, an outer cap, an inner cap, the fuse link, a locking module seat, a contact rod, a screw, a fixing piece, an upper cover and an O-shaped ring, wherein the base inner ring is sleeved in the base ferrule in a penetrating way, the contact rod is installed in the locking module seat in a knob mode, the locking module is arranged at the upper part of the locking module seat, the screw passes through the locking module and is installed in the locking block seat in the knob mode, the installed locking module passes through a through hole formed in the base inner ring through the contact rod and sinks to the bottom of the base inner ring, one end of the contact rod, which penetrates out of the base inner ring part and serves as a load end, is used for being connected with electric equipment, the O-shaped ring made of elastic plastic materials is arranged at the bottom of the contact rod, which penetrates out of the base ferrule, so that the contact rod is conveniently connected and fixed with the electric equipment, and the creepage distance between the fuse link and the lead line is increased;

the fuse body is arranged in the inner ring of the base, a fixing piece is arranged in the inner ring and made of pure copper, so that a contact of the fuse body is in full contact with the conducting circuit, the fuse body is prevented from shaking due to surplus space in the inner ring of the base, an upper cover is arranged at the top of an outer cap of the fuse body, the inner cap is sleeved in the outer cap in a penetrating manner, the inner cap is arranged on the sleeve ring of the base in a knob mode through a threaded ring arranged in the inner cap, and the internally arranged fuse body is compressed and fixed;

this kind of novel structure spiral fuse base and fuse-link's connection structure, its characterized in that: in order to increase the creepage distance between the fuse base and the fuse link, the inner ring and the inner cap of the base at the contact part of the fuse link and the fuse link in the base are newly added, and the material is plastic material with good insulation and high voltage resistance.

2. And the outer layer of the base ferrule is provided with a load end connected with a circuit.

3. And an observation window is arranged at the upper cover part of the upper part of the outer cap.

4. The upper part of the anti-loosening module seat is provided with a concave ring for installing the anti-loosening module, and an energy storage spring is arranged between the anti-loosening module and the anti-loosening module seat.

5. The fuse-link is inside to be provided with supplementary fuse-element, and is provided with the fusing indicator at the top of one of them end to show and observe the operating condition of fuse-link.

6. Arc extinguishing media are filled in the inner cavity of the fuse link.

7. The fuse-link's fuse-link sets up to the variable cross section, has certain angle's bending along length direction, makes the arc angle stagger, and both ends shaping portion is the telescopic L type to improve anti-seismic, shock-resistant ability.

8. And silica gel is filled in gaps among the fuse link fuse tube, the interface contact and the fuse indicator so as to prevent sand leakage and electric arc emission generated during breaking, and prevent moist air from entering the tube body to cause melt oxidation and copper/silver ion migration.

9. The base and circuit load connecting material and the inner cover and the outer cover which are used for conducting in the fuse link body both adopt a copper silver plating mode to reduce temperature rise and improve current carrying capacity.

Compared with the common fuses in the current market, the connecting structure of the novel-structure spiral fuse base and the fuse link has the most remarkable characteristic that a layer of inner ring made of plastic material is additionally arranged at the contact part of the inner part of the base and the fuse link, the base shell in the traditional technical scheme is also made of metal or plastic material instead of ceramic material, and the material of the fuse link is made of ceramic material instead of plastic and resin material, so that on one hand, the creepage distance between the base and the fuse link is increased, and on the other hand, the natural defects of the ceramic material in aspects of moisture and heat resistance, vibration resistance, impact resistance and the like are overcome, so that the spiral fuse base and the fuse link with the same appearance size in the same environment can achieve the aims of improving the breaking capacity and the current carrying capacity, and improving the stability, the durability, the reliability, the service life and the like.

The fuse-element of installation sets up to the variable cross section in the fuse-element, and has certain angle bend along length direction, makes the arcing angle stagger, and both ends shaping portion is the telescopic L type, both is convenient for shorten the arcing time, has still improved anti-seismic and shock-resistant ability.

The anti-loose module is changed into the telescopic spring type from the card type, although the manufacturing process and the working procedures are increased, the abrasion of the contact block to the fuse link contact (outer cover) can be reduced, the electroplated layer is protected from being damaged, and because the spring is adopted in the design scheme, the anti-loose module is in closer contact with the fuse link contact (outer cover), the contact resistance is correspondingly reduced, and the temperature rise in the operation process is favorably reduced.

And adopt silica gel as the packing of the gap between fuse-link and interface contact and fusing indicator, then can effectually prevent to leak the electric arc that sand and production when breaking from spouting outward, prevent simultaneously that moist air from getting into the body, cause fuse-element oxidation, copper/silver ion migration.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an exploded view of the finished structure of the embodiment of the utility model.

Fig. 3 is an exploded view of the fuse link product structure according to the embodiment of the utility model.

Fig. 4 is a schematic perspective view of a loose-proof module according to an embodiment of the present invention.

FIG. 5 is a schematic view of the overall structure of the lower end of the base according to the embodiment of the present invention

Description of reference numerals: 1. a base ferrule; 2. an outer cap; 3. an inner cap; 4. a base inner ring; 5. a fuse link; 6, a locking module seat; 7. a screw; 8. the locking module, 9, energy storage spring; 10. a contact lever; 11. a fixing sheet; 12. an upper cover; 13. an O-shaped ring; 101. a thread ring; 102. a load end connecting block; 501. a fusion tube; 502. melting the materials; 503. an inner cover; 504. a contact; 505. an auxiliary melt; 506. a fusing indicator.

Detailed Description

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

The embodiment, as shown in fig. 1 and 2, the connection structure of the novel structural spiral fuse base and the fuse link includes a base ring 1, an outer cap 2, an inner cap 3, a base inner ring 4, a fuse link 5, a locking module base 6, a screw 7, a locking module 8, an energy storage spring 9, a contact rod 10, a fixing piece 11, an upper cover 12, and an O-ring 13, and when the base is partially produced and installed, the base can be divided into 3 modules which are respectively manufactured and assembled:

a first module: 3 parts are arranged at the lower part of the base (the lower end of the base), the base ferrule 1 is made of metal, the base inner ring 2 is made of plastic, and the O-shaped ring 13 is made of elastic plastic; the base inner ring 2 is pressed by a special device in a physical mode and is sleeved in the base sleeve ring 1 in a penetrating mode, and an O-shaped ring is arranged at the concave ring part of an O-shaped ring 13 arranged at the part of the base inner ring 2 exposed outside the base sleeve ring 1, so that the manufacture of the lower part of the base is basically finished; as shown in fig. 5, the base ring 1 is provided with an external thread 101 for connecting with an internal thread arranged in the inner ring 3 of the base cap, and the load end connecting block 102 arranged on the base ring 1 is used for connecting with the other end of the circuit on one hand, and can connect and fix the base to the power line or the protected device through the through hole arranged at the end on the other hand, and plays a role of stabilizing and fixing the base together with the connecting rod 12.

A second module: 4 base caps (namely the upper part of the base), 4 parts, an outer cap 2 made of metal, an inner cap 3 made of plastic, a fixing piece 11 made of elastic pure copper, an O-shaped groove formed with an opening, and an upper cover 12 made of transparent glass or plastic; the inner cap 3 is physically pressed by a special device to be inserted into the inner ring of the outer cap 2, the upper cover 12 is installed on the top of the outer cap 2, and the fixing piece 11 is arranged in the inner cavity of the inner cap 3.

A third module: the anti-loosening block is shown in figure 4, 4 fittings are made of metal materials, and comprise a contact rod 12, an energy storage spring 9, a loosening-proof module 8, a loosening-proof module seat 6 and a screw 7; firstly, the energy storage spring 9 is placed in an energy storage spring mounting hole arranged in a concave ring on the upper portion of the anti-loosening module seat 6, then the anti-loosening module 8 is placed in the concave ring, a screw 7 penetrates through a screw through hole arranged in the anti-loosening module 8, the energy storage spring 9 penetrates through and is screwed into a threaded hole in the bottom of the concave ring on the upper portion of the anti-loosening module seat 6, and finally the contact rod 12 is mounted on the lower portion of the anti-loosening module seat 6.

When the anti-loosening module is installed and assembled, the contact rod 12 of the anti-loosening block penetrates through a through hole formed in the base inner ring 2 at the lower part of the base, so that the installed anti-loosening module 8 is settled to the bottom of the base inner ring 2 through the contact rod 12, and one end, serving as a load end, of the contact rod 12, which penetrates through the base inner ring 2, is used for being connected with electric equipment;

next, the fuse link 5 is inserted into the second module, i.e. the inner cavity of the inner cap 3, wherein the contact portion for conducting electricity is inserted into the fixing piece 11, and fully contacts with the fixing piece, and then the base cap portion is butted with the lower portion of the base, and the fuse link 5 mounted inside is pressed by mutually turning the external thread ring 101 provided outside the base ring 1 and the internal thread ring (not shown in the figure) provided inside the inner cap 3, and the anti-loose module 8 is pressed and the energy storage spring 9 is retracted, so that the contact portions at both ends of the fuse link fully contact with the copper conductive portions on the base inner ring 2 and the inner cap 3.

In the aspect of manufacturing and installing the fuse link, as shown in fig. 3, the main parts include: a melt tube 501, a melt 502, an inner cover 503, a contact 504, an auxiliary melt 505, a fuse indicator 506, and an arc suppressing filler (not shown). Firstly, inner covers 503 are installed at two ends of a fuse tube 501, then a melt 502 penetrates through the fuse tube 501, end heads at two ends of the melt 502 are welded on the inner covers 503 at two ends of the fuse tube 501, then a fuse indicator 506 is welded at one end of an auxiliary melt, one end of the auxiliary melt, which is not welded with the fuse indicator 506, penetrates through a contact 504 at one end provided with a through hole, then penetrates through the fuse tube 501, the contact which is sleeved with the fuse indicator 506 is installed on the fuse tube 501 in an interference fit mode, the end head part at the other end of the fuse tube 501 is welded on the inner cover 503, then arc extinguishing filler is filled into an inner cavity of the fuse tube 501 at the end of the fuse tube 501, and finally the contact is installed at the end, so that the installation of a fuse link is completed.

In order to effectively prevent sand leakage and electric arc outward emission generated during breaking and prevent moist air from entering the tube body to cause melt oxidation and copper/silver ion migration, in the embodiment, the gaps among the fuse link tube, the interface contact and the fuse indicator are filled with silica gel, so that the sealing performance is better.

Claims (9)

1. Novel connection structure of structure spiral fuse base and fuse-link, its characterized in that: the anti-loosening module comprises a base ferrule, a base inner ring, an outer cap, an inner cap, a fuse-link, an anti-loosening module seat, a contact rod, a screw, a fixing piece, an upper cover and an O-shaped ring, wherein the base inner ring is sleeved in the base ferrule in a penetrating manner, the contact rod is installed in the anti-loosening module seat in a knob manner, the anti-loosening module is arranged at the upper part of the anti-loosening module seat, the screw penetrates through the anti-loosening module and is installed in the anti-loosening block seat in a knob manner, the installed anti-loosening module penetrates through a through hole formed in the base inner ring to sink to the bottom of the base inner ring through the contact rod, the contact rod penetrates out of the base inner ring to serve as one end of a load end to be connected with electric equipment, the O-shaped ring made of elastic plastic is arranged at the bottom of the contact rod penetrating out of the base ferrule, so that the contact rod is conveniently connected with the electric equipment to be compressed and fixed, and the creepage distance between the fuse-link and a lead line is increased;

the fuse body is arranged in the inner ring of the base, a fixing piece is arranged in the inner ring and made of pure copper, so that a contact of the fuse body is in full contact with the conducting circuit, the fuse body is prevented from shaking due to surplus space in the inner ring of the base, an upper cover is arranged at the top of an outer cap of the fuse body, the inner cap is sleeved in the outer cap in a penetrating manner, the inner cap is arranged on the sleeve ring of the base in a knob mode through a threaded ring arranged in the inner cap, and the internally arranged fuse body is compressed and fixed;

this kind of novel structure spiral fuse base and fuse-link's connection structure, in order to increase the creepage distance between fuse-link base and the fuse-link, base inner circle and the inner cap with fuse-link fusion tube contact part are newly-increased in the base, and the material is the plastics class material that has insulating and high voltage resistance.

2. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: and the outer layer of the base ferrule is provided with a load end connected with a circuit.

3. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: an observation window is arranged on the upper cover part of the upper part of the outer cap.

4. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: the upper part of the anti-loosening module seat is provided with a concave ring for installing the anti-loosening module, and an energy storage spring is arranged between the anti-loosening module and the anti-loosening module seat.

5. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: the fuse-link is inside to be provided with supplementary fuse-element, and is provided with the fusing indicator at the top of one of them end to show and observe the operating condition of fuse-link.

6. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: and an arc extinguishing medium is filled in the inner cavity of the fuse link.

7. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: the fuse-link's fuse-link sets up to the variable cross section, has certain angle's bending along length direction, makes the arc angle stagger, and both ends shaping portion is the telescopic L type to improve anti-seismic, shock-resistant ability.

8. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: silica gel is filled in gaps among the fuse link fuse tube, the interface contact and the fuse indicator so as to prevent sand leakage and electric arc emission generated during breaking, and prevent moist air from entering the tube body to cause melt oxidation and copper/silver ion migration.

9. The connection structure of a novel structural screw fuse base and a fuse link according to claim 1, characterized in that: the inner cover and the outer cover which are used for conducting electricity in the base, the circuit load connecting material and the fuse link body are all made of copper silver plating, so that the temperature rise is reduced, and the current carrying capacity is improved.

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