CN213183800U - Current type quick fusing resistor - Google Patents

Abstract

The utility model discloses a quick fusing resistance of electric current type belongs to resistance design technical field, including high thermal conductivity pottery, overload fusing type metal film, quick fusing agent, incombustible resistant insulating coating layer, sign, two tin-plated metal caps and two lead wires, two the both ends at high thermal conductivity pottery are established to tin-plated metal cap cover, overload fusing type metal film covers the high thermal conductivity ceramic surface between two tin-plated metal caps, it has a plurality of cutting flutes to cut on the overload fusing type metal film, the central point at overload fusing type metal film is coated to quick fusing agent, incombustible resistant insulating coating layer cladding is outmost at this resistance, two the lead wire is connected two tin-plated metal caps's center respectively and is run through incombustible resistant insulating coating layer and extend outwards. The resistor can not only achieve very accurate quick fusing time, but also improve the anti-surge capacity of the fusing resistor, and the product has wider application range.

Description

Current type quick fusing resistor

Technical Field

The utility model belongs to the technical field of resistance design technique and specifically relates to a quick fusing resistor of electric current type is related to.

Background

The fuse resistor is divided into two types, namely a recoverable fuse resistor and a disposable fuse resistor, the recoverable fuse resistor plays a role of fixing the resistor within rated current, and when overcurrent occurs in a circuit, a welding point of the recoverable fuse resistor is firstly melted, so that a spring type metal wire (or an elastic metal sheet) is disconnected with the resistor. After circuit faults are eliminated, the resistor and a metal wire (or a metal sheet) are welded as required, normal use can be recovered, the use of the fusing resistor is more and more extensive along with the development of modern electronic products such as electronic computers, color televisions, program-controlled switches, teletypewriters and the like, various novel electronic products are widely entered into families in recent years, and a fireproof protection device in an electronic circuit has great responsibility on the safety of the electronic circuit.

The existing fusing resistor product has the advantages of long fusing time, dispersed fusing time parameters, weak surge resistance and poor stability, in order to pursue fusing time, a plurality of manufacturers use ceramic rods with low thermal conductivity and low alumina content or low-alkali ceramic rods, the cutting line of the resistor conductive film is controlled to be 2-3 mm, the product is poor in intermittent overload test, particularly surge test, and basically < 200V in the test of 1.2/50 mu s, so that the application range of the metal film fusing resistor is limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a quick fusing resistor of electric current type to solve among the prior art technical problem that range of application is narrow, fusing time is unstable, anti surge ability is poor, fusing time parameter disperses.

The utility model provides a quick fusing resistance of electric current type, including high thermal conductivity pottery, high thermal conductivity pottery is cylindrical structure, high thermal conductivity pottery's both ends are all overlapped and are equipped with tin-plated metal cap, two rely on the interference riveting to be connected between the inboard of tin-plated metal cap and the high thermal conductivity pottery's both ends.

Furthermore, an overload fusing type metal film covers the outer side surface of the high-thermal-conductivity ceramic between the two tinned metal caps.

Further, a plurality of cutting grooves are cut in the overload fusing type metal film.

Further, the central point of overload fusing type metallic film puts the coating and has quick fusing agent, quick fusing agent's width is 2 ~ 3mm, quick fusing agent's thickness is 2 rings of thickness of overload fusing type metallic film at most.

Furthermore, the outer sides of the quick fusing agent, the overload fusing type metal film and the two tinned metal caps are wrapped with a non-combustible insulating coating layer.

Furthermore, the central positions of the outer ends of the two tinned metal caps are respectively connected with a lead wire, and the lead wires penetrate through the incombustible insulation-resistant coating and extend outwards.

Compared with the prior art, the beneficial effects of the utility model reside in that:

firstly, the resistor adopts a structure coated with non-combustible insulating paint, when the resistor bears overload current or voltage, a specified overload fusing type metal film generates relatively high energy and surface temperature rise, the energy and the surface temperature rise are transmitted to a quick fusing agent material to be quickly fused, and larger energy and temperature rise are generated in the process, the energy and the temperature rise are enough for the overload fusing type metal film to be instantly fused, so that precious elements such as chips, ICs and the like in a circuit are protected from being damaged, and the circuit is protected from explosion, fire and the like.

Secondly, the resistor adopts the alumina ceramic bar with high thermal conductivity, so that the electrical impedance surge performance is good, and the application range is wide.

Thirdly, the resistor has very stable fusing time characteristic, can meet the optimal requirements of circuit design, and even can achieve plus or minus 1 second.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a partially exploded view of the present invention;

fig. 2 is a cross-sectional view of the present invention.

Reference numerals: lead wire 1, tin-plated metal cap 2, high thermal conductivity ceramic 3, overload fusing type metal film 4, cutting groove line 5, quick fusing agent 6, incombustible insulating-resistant coating layer 7.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Following combine fig. 1 to fig. 2 shown, the utility model provides a quick fusing resistance of electric current type, including high thermal conductivity pottery 3, high thermal conductivity pottery 3 adopts high thermal conductivity alumina porcelain stick, high thermal conductivity pottery 3 is cylindrical structure, high thermal conductivity pottery 3's both ends are all overlapped and are equipped with 2 sets of tinned metal cap, 2 sets of tinned metal cap adopt the deep tin plating treatment preparation of iron cap that rises the steel band punching press behind surface coating again to form, two rely on the interference riveting to be connected between 2 sets of inboard of tinned metal cap and high thermal conductivity pottery 3's both ends.

The outer side surface of the high-thermal-conductivity ceramic 3 between the two tin-plated metal caps 2 is covered with a layer of overload fusing metal film 4, and the overload fusing metal film 4 is prepared from materials such as nickel, chromium, aluminum, iron, vanadium, silicon and the like by an evaporation or vacuum sputtering method.

The overload fusing type metal film 4 is provided with a plurality of cutting groove lines 5 in a cutting mode, and the cutting groove lines 5 are formed by conducting film cutting in a grinding wheel cutting or laser cutting mode, so that the resistance value required by the circuit is manufactured.

The center position of the overload fusing type metal film 4 is coated with a rapid fusing agent 6, the rapid fusing agent 6 is made into fusing powder by respectively weighing 7-25% of thallium oxide, 25-40% of phenolic resin, 35-60% of tin powder, 2-10% of magnesium powder and 3-10% of sulfur powder, then the fusing powder is prepared by using terpineol and ethyl cellulose as adhesives prepared by taking the main components, the adhesives and the fusing powder are mixed to form the fusing agent, mass production coating can be carried out by a coating machine, the width of the rapid fusing agent 6 is 2-3 mm, the thickness of the rapid fusing agent 6 is at most the thickness of 2 circles of the overload fusing type metal film 4, too much coating has no practical significance, when a resistor bears overload current or voltage, the specified overload fusing type metal film 4 generates relatively high energy and surface temperature rise, the energy and the surface temperature rise are transmitted to the material of the rapid fusing agent 6 to enable the overload fusing agent to be rapidly fused, and larger energy and temperature, the energy and the temperature rise are enough to cause the 4 layers of the overload fusing type metal films to be instantly blown, so that chips, ICs and other precious elements in the circuit are protected from being damaged, and the circuit is protected from explosion, fire and the like.

The fast fusing agent 6, the overload fusing type metal film 4 and the two tin-plated metal caps 2 are wrapped with a non-combustible insulating paint layer 7, and the non-combustible insulating paint layer 7 is of a structure of being coated with fireproof insulating paint.

The central positions of the outer side ends of the two tin-plated metal caps 2 are respectively connected with a lead 1, the lead 1 penetrates through the incombustible insulating-resistant coating layer 7 and extends outwards, and the lead 1 is made of pure copper tin-plated or steel-clad tin-plated wires.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (6)

1. The utility model provides a quick fusing resistance of electric current type, its characterized in that, includes high thermal conductivity pottery (3), high thermal conductivity pottery (3) are cylindrical structure and adopt high thermal conductivity alumina porcelain stick, the both ends of high thermal conductivity pottery (3) all overlap and are equipped with tin-plated metal cap (2) cover, two rely on the interference riveting to be connected between the inboard of tin-plated metal cap (2) and the both ends of high thermal conductivity pottery (3).

2. An amperometric fast blowing resistor according to claim 1, wherein the outer surface of the ceramic (3) of high thermal conductivity between the two jackets of tin-plated metal caps (2) is covered with an overload blowing metal film (4).

3. An amperometric fast fusing resistor as claimed in claim 2, wherein a plurality of cutting grooves (5) are cut in the overload fusing metal film (4).

4. A current type fast fusing resistor as claimed in claim 3, wherein the center of the overload fusing metal film (4) is coated with fast fusing agent (6), the width of the fast fusing agent (6) is 2-3 mm, and the thickness of the fast fusing agent (6) is at most 2 circles of the thickness of the overload fusing metal film (4).

5. An electric current type rapid fuse resistor as claimed in claim 4, wherein the outside of the rapid fuse agent (6), the overload fuse type metal film (4) and the two tin-plated metal cap (2) sleeves are encapsulated with a layer (7) of incombustible insulating paint.

6. A current type quick fusing resistor as claimed in claim 5, wherein the central position of the outer side end of each of the two tin-plated metal caps (2) is connected with a lead (1), and the leads (1) penetrate through the incombustible insulating paint layer (7) and extend outwards.

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