CN106229241A - Fusing resistor - Google Patents

Abstract

The invention discloses a fuse resistor, comprising: a first connection terminal and a second connection terminal; a fuse body connected to the first connection terminal and the second connection terminal respectively; wherein, the fuse body is a copper-tin alloy body; application In the fuse resistor of the technical solution of the present invention, a first connection terminal and a second connection terminal are provided, and fuses respectively connected to the first connection terminal and the second connection terminal are provided between the first connection terminal and the second connection terminal , the fuse body is a copper, tin alloy body, there is no breakpoint on the fuse body of the copper and tin alloy body, the resistivity of the fuse body can be accurately determined, thereby determining its fusing temperature and fusing time, which solves the problem of the fuse in the prior art The heat generated is not easy to control, which leads to the problem that the fusing temperature and fusing time are not easy to control, which effectively improves the safety of the circuit operation, and at the same time greatly increases the working voltage range and expands the application range of the fusing resistor.

Description

Fused resistor

technical field

The invention relates to the field of electric equipment, in particular to a fuse resistor.

Background technique

Fuse is a commonly used safety device in the field of power transmission. Traditional fuse fuses are combined with end caps and leads in glass tubes or ceramic tubes. When the current changes, the heat generated by the resistance is not easy to control, so that the dispersion of the fusing time is too large. , the security of use is greatly reduced.

Contents of the invention

The main purpose of the present invention is to provide a fuse resistor to at least solve the problem in the prior art that the heat generated by the fuse is difficult to control and thus the fusing temperature and fusing time are difficult to control.

In order to achieve the above object, according to the present invention, a fuse resistor is provided, including: a first connection terminal and a second connection terminal; a fuse body connected to the first connection terminal and the second connection terminal respectively; wherein, the fuse body is Copper, tin alloy body.

Further, the first connection terminal and the second connection terminal are pure copper substrates.

Further, the first connection terminal, the second connection terminal and the fuse link are integrally formed, and the fuse link is formed into a copper and tin alloy body by a tin infiltration process.

Further, the fuse link is in the shape of a straight rod.

Further, the fuse link is in a "V" shape.

Further, the fuse link is in a "Z" shape.

Further, the fuse link is "S" shaped.

Further, the fuse link is a sheet-shaped body, and the fuse link is provided with a plurality of through holes along its thickness direction.

Further, the fuse resistor further includes: an insulating casing disposed at one end of the first connecting terminal and the second connecting terminal, at least part of the first connecting terminal and the second connecting terminal and the fuse are located in the insulating casing.

Further, vent holes are opened on the insulating shell.

The fuse resistor applying the technical solution of the present invention, by setting the first connection terminal and the second connection terminal, is provided with a fuse respectively connected to the first connection terminal and the second connection terminal between the first connection terminal and the second connection terminal. Body, the fuse body is copper, tin alloy body, there is no breakpoint on the fuse body of copper, tin alloy body, the resistivity of the fuse body can be accurately determined, so as to determine its fusing temperature and fusing time, which solves the problems in the prior art The heat generated by the fuse is not easy to control, which leads to the problem that the fusing temperature and fusing time are not easy to control, which effectively improves the safety of the circuit operation, and at the same time greatly increases the working voltage range and expands the application range of the fusing resistor.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of an optional fusing resistor according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an optional second fusing resistor according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a third optional fusing resistor according to an embodiment of the present invention;

4 is a schematic structural diagram of a fourth optional fusing resistor according to an embodiment of the present invention;

5 is a schematic structural diagram of a fifth optional fusing resistor according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of structural changes in the tin infiltration process of an optional fuse link according to an embodiment of the present invention;

FIG. 7 is a graph showing the relationship between the resistance value distribution and the fusing time of the fuse body of an optional fusing resistor according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of a comparison of currents of a fuse of an optional fusing resistor according to an embodiment of the present invention under normal operation and unbroken conditions;

Fig. 9 is a schematic diagram of the structural change of the fuse body of the optional fusing resistor during the fusing process according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of current changes of a fuse body of an optional fusing resistor according to an embodiment of the present invention during the fusing process; and

Fig. 11 is a schematic diagram of the temperature change of the fuse body of the optional fusing resistor during the fusing process according to an embodiment of the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. First connection terminal; 20. Second connection terminal; 30. Fuse link; 40. Insulation shell; 41. Air vent.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

A fuse resistor according to an embodiment of the present invention, as shown in FIGS. 1 to 5 , includes: a first connection terminal 10, a second connection terminal 20 and a fuse 30; The connecting terminal 20 is connected; wherein, the fuse body 30 is a copper and tin alloy body.

The fuse resistor applying the technical solution of the present invention, by setting the first connection terminal 10 and the second connection terminal 20, is provided with the first connection terminal 10 and the second connection terminal 20 between the first connection terminal 10 and the second connection terminal 20 respectively. The fuse link 30 connected to the connection terminal 20 is a copper-tin alloy body. There is no breakpoint on the fuse link 30 using a copper-tin alloy body, so the resistivity of the fuse link 30 can be accurately determined, thereby determining its fusing temperature and The fusing time solves the problem that the heat generated by the fuse in the prior art is not easy to control, which leads to the difficult control of the fusing temperature and fusing time, effectively improves the safety of the circuit operation, and at the same time greatly increases the range of the working voltage and expands the fusing time. range of resistors.

In order to ensure the conductivity of the first connection terminal 10 and the second connection terminal 20, optionally, the first connection terminal 10 and the second connection terminal 20 are pure copper substrates, which have good conductivity and stable resistance values. Low loss. The first connection terminal 10, the second connection terminal 20, and the fuse 30 are integrally formed of pure copper. The fuse 30 is infiltrated with a small amount of tin to form a copper-tin alloy body. The fuse 30 has no breakpoints, which are consistent. The reliability only depends on the resistivity and shape of the material of the fuse link 30, the design is simple and feasible, and the reliability is extremely high.

According to the amount of infiltrated tin, the resistance value of the fuse 30 can be precisely controlled, so that the fusing temperature and fusing time can be determined to ensure normal fusing even at low temperature. When different currents flow through the fuse body 30, its resistance will change, and heat will be generated at the same time. When the temperature reaches a predetermined temperature, it will be fused to protect the subsequent circuit and ensure safety.

Under normal circumstances, the melting point of metal copper is very high, generally reaching 1083.4 degrees Celsius, and the melting reaction temperature can be controlled at 150-170 degrees Celsius to start melting by infiltrating tin into the fuse 30 part. The structural changes of the fuse 30 during the tin infiltration process are shown in Figure 6. At the beginning, the copper matrix and the tin balls are solid; as the temperature increases, entering the second stage, the copper matrix is still solid, and the tin balls are still solid. The ball begins to melt into a liquid state and begins to diffuse to the copper substrate; when entering the third stage, part of the copper substrate also begins to melt into a liquid state, and the tin ball continues to diffuse to the copper substrate, and the mixture of the two is solid and liquid; in the last stage, the copper substrate and the tin balls completely form a liquid alloy, and after cooling down, a copper-tin fusion link 30 can be formed.

In addition to the material of the fuse link 30 , the resistance value of the fuse link 30 can also be precisely controlled by designing the fuse link 30 into different shapes. According to different fusing temperature and fusing time requirements, optionally, as shown in FIG. 1 to FIG. 5 , the fuse body 30 may be in the shape of a straight rod, a "V", a "Z" or an "S". In addition, the fuse link 30 may also be a sheet-shaped body, and the sheet-shaped fuse link 30 is provided with a plurality of through holes along its thickness direction. Different shapes of fuses 30 have different resistance values under static current and dynamic current, which can be selected according to needs.

As shown in FIG. 7 , through a large number of mathematical statistics and simulation design, the corresponding relationship between the distribution of the resistance value of the fuse 30 and the fusing time can be obtained, so that the fusing time of the fusing resistor can be judged according to the difference in the resistance value of the fuse 30 . Through the corresponding relationship between the fusing time and the resistance value of the fuse body 30, fusing resistors with different fusing times can be designed to achieve the effect of accurately controlling product parameters.

The working principle of the fuse 30 is: usually when the circuit fails, the components are damaged, causing a short circuit. At this time, the power supply will be short-circuited and the instantaneous current will increase sharply, which will further burn the equipment and components, and will be accompanied by smoke and fire. To avoid these dangerous factors is to limit the current and to safely break the current. As shown in FIG. 8 , the solid line part is the current during normal operation, and the dotted line part is the current when the fuse resistor is not used or the fuse resistor is not working normally.

If the fuse link 30 is not blown, the instantaneous impact of the current will be very large, generally more than ten times the rated current, and it is very easy to catch fire. However, if the fuse 30 works, it will limit the fault current within a safe range when the instant the resistance becomes large. The fuse 30 of this embodiment can be disconnected within half a cycle less than the normal operating current, generally for 50 Hz The breaking time of the power supply is 10ms, and the breaking time of the 60Hz power supply is 8.3ms, which can quickly disconnect the circuit and protect the subsequent circuit.

The specific operation of the fuse link 30 is divided into two stages, as shown in Figure 9 and Figure 10, in the first stage, that is, within the time period from t1 to t2, the resistance value of the fuse link 30 begins to change, and the heat energy generated is I ² RT, the heat energy generated during the time period from t1 to t2 can be calculated by means of integral. The resistance of the fuse link 30 will gradually increase as the temperature increases, and the increase in resistance will further increase the heat generated. This is a positive feedback process. The fuse link 30 will change from solid to liquid, and will eventually become soft and liquid. In the second stage, that is, during the time period from t2 to t3, the liquid alloy body will break away from the body of the fuse 30 due to gravity, and at this time, the ionized air will form the ignition time, and the two sections of the fuse 30 starts arcing and continues to burn the fuse 30 behind, it will be accompanied by crackling sound and flash, and then it will be completely disconnected to form a safe protection gap. The voltage of the power supply is all added to the first connecting terminal 10 and the second The second connection terminal 20.

As shown in FIG. 11 , it is the temperature change of the fuse link 30 during the fusing process.

As shown in the table below, it shows the different fusing characteristics of the fuse link 30 under different currents.

In order to effectively insulate and thus facilitate use, as shown in FIGS. At least part of the fuse body 30 is located in the insulating shell 40, a cavity structure is formed in the insulating shell 40, the fuse body 30 is located in the cavity structure, and a vent hole 41 communicating with the internal cavity structure is opened on the wall of the insulating shell 40 , so that the fuse body 30 is exposed to the air, and the heat generated when the fuse body 30 is blown can be dissipated to the outside through the vent hole 41, so as to ensure that the heat generated when the fuse is broken can be released safely, ensuring that the entire circuit will not generate open smoke and fire, and ensuring The safety breaking of the fuse link 30 under high voltage protects the safety of the latter stage circuit.

Through the material selection and structural design of the fuse 30 and the structural design of the insulating shell 40, the design voltage of the fuse resistor can reach 250VDC/AC, or even 350V, fully meeting the protection requirements under power frequency voltage. At the same time, different structures and material selections can meet different current requirements, and the design current can range from 40mA to hundreds of amperes.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (10)

1. a fusing resistor, it is characterised in that including:

First connects terminal (10) and second connects terminal (20)；

Fuse-link (30), is connected terminal (10) and described second respectively and connects terminal (20) connection with described first；

Wherein, described fuse-link (30) is copper, ashbury metal body.

Fusing resistor the most according to claim 1, it is characterised in that described first connects terminal (10) and described second Connecting terminal (20) is fine copper matrix.

Fusing resistor the most according to claim 2, it is characterised in that described first connect terminal (10), described second Connecting terminal (20) and described fuse-link (30) is formed in one, described fuse-link (30) uses and oozes process of tin formation copper, stannum conjunction Jin Ti.

Fusing resistor the most according to claim 1, it is characterised in that described fuse-link (30) is straight rod-shaped.

Fusing resistor the most according to claim 1, it is characterised in that described fuse-link (30) is " V " font.

Fusing resistor the most according to claim 1, it is characterised in that described fuse-link (30) is " Z " font.

Fusing resistor the most according to claim 1, it is characterised in that described fuse-link (30) is serpentine.

Fusing resistor the most according to claim 1, it is characterised in that described fuse-link (30) is plates, described molten Disconnected body (30) offers multiple through hole along its thickness direction.

Fusing resistor the most according to claim 1, it is characterised in that described fusing resistor also includes:

Insulation crust (40), is arranged on described first one end connecting terminal (10) and described second connection terminal (20), described The first at least part of and described fuse-link (30) connecting terminal (10) and described second connection terminal (20) be positioned at described absolutely In edge shell (40).

Fusing resistor the most according to claim 9, it is characterised in that described insulation crust offers ventilation on (40) Hole (41).