Novel new energy automobile high-voltage fuse

Abstract

The utility model relates to the technical field of fuses, in particular to a novel high-voltage fuse for a new energy automobile, which comprises a protective shell, electrodes fixedly arranged at two ends of the protective shell, a melt fixedly arranged between the electrodes at the two ends, a blowing arc extinguishing part and a filling arc extinguishing part, and the blowing arc extinguishing part and the filling arc extinguishing part are arranged in the protective shell. When the melt is fused to generate an electric arc, the blowing arc extinguishing part blows the electric arc out of the protective shell, and the filling arc extinguishing part is used for preventing the electric arc from diffusing in the protective shell; according to the utility model, the annular groove is arranged around the fuse body, so that the fuse body can only be fused at the annular groove; the guide pipe is arranged to guide gas in the balloon to the melt, electric arcs generated by the melt are blown away, the situation that due to the fact that the electric arcs exist for a long time, the melt cannot cut off current in a circuit in time is avoided, and therefore thermal damage to circuit elements caused by the electric arcs is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fuse, especially a novel new energy automobile high -voltage fuse. BACKGROUND

[0002] New energy automobile refers to the new type of power system, completely or mainly relying on new energy drive automobile, including pure electric vehicle, plug -in hybrid electric vehicle, fuel cell electric vehicle etc. In order to protect the circuit of new energy automobile, high voltage fuse will be installed in its circuit.

[0003] The fuse for high-voltage fuse of the Chinese patent with the application number CN201811209106.7 forms a closed space by the part of the soluble connecting wire arranged in the arc extinguishing tube passing through the inner wall of the arc extinguishing tube, the head part and the supporting bolt. Therefore, when the soluble connecting wire is fused, the arc extinguishing gas can be enclosed in the closed space, the pressure of the closed space can be sharply increased, and the arc generated by the fuse part can be arc extinguished by using the arc extinguishing gas. However, the fuse only relies on the arc extinguishing gas to eliminate the arc generated when the fuse is fused, and the arc cannot be blown away in time, so that the current in the circuit cannot be immediately cut off, which can cause thermal damage to the circuit elements. SUMMARY

[0004] The main purpose of the utility model is to provide a novel new energy automobile high-voltage fuse to solve the problems in the related art.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a novel new energy automobile high-voltage fuse is provided, which comprises a protective shell, electrodes fixed at both ends of the protective shell, and a fuse body fixed between the two electrodes, and further comprises a gas blowing arc extinguishing part and a filling arc extinguishing part, both of which are arranged inside the protective shell. When the fuse body is fused to generate an arc, the gas blowing arc extinguishing part blows out the arc from the protective shell, and the filling arc extinguishing part is used to prevent the arc from spreading in the protective shell.

[0006] Further, the electrodes are electrically connected with the fuse body, and a through hole for connecting external wires is arranged on the electrode.

[0007] Further, a plurality of annular grooves are arranged on the outer circle of the fuse body.

[0008] Further, the filling arc extinguishing part comprises an arc extinguishing cavity and a conduit, the fuse body is located in the arc extinguishing cavity, the conduit is transversely arranged in the arc extinguishing cavity, and the fuse body penetrates the conduit.

[0009] Further, an isolation net is fixedly arranged in one end of the protective shell outer wall.

[0010] Furthermore, the air-blowing arc-extinguishing part includes an air chamber and a balloon, with the other end of the conduit extending into the air chamber, the balloon located inside the air chamber, and fixedly connected to the other end of the conduit.

[0011] Furthermore, the air-blowing arc-extinguishing section also includes an air-blocking plate, which is fixedly disposed inside the other end of the conduit.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention creates an annular groove around the melt, ensuring that the melt can only melt at the groove. By using a conduit to guide the gas from the balloon to the melt, the arc generated by the melt is dispersed, preventing the arc from persisting for a long time and thus avoiding the melt's inability to cut off the current in the circuit in time, thereby preventing thermal damage to circuit components caused by the arc. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0015] Figure 2 This is a cross-sectional view of the present invention.

[0016] Figure label:

[0017] 1. Protective shell; 2. Electrode; 3. Through hole; 4. Melt; 5. Gas cavity; 6. Arc extinguishing cavity; 7. Conduit; 8. Annular groove; 9. Balloon; 10. Isolation net; 11. Gas barrier. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0019] This embodiment provides a novel high-voltage fuse for new energy vehicles, such as... Figure 1 As shown, it includes a protective shell 1, electrodes 2 fixed at both ends of the protective shell 1, and a melt 4 fixed between the two electrodes 2. It also includes an air-blowing arc-extinguishing part and a filling arc-extinguishing part. Both the air-blowing arc-extinguishing part and the filling arc-extinguishing part are located inside the protective shell 1. When the melt 4 melts and generates an arc, the air-blowing arc-extinguishing part blows the arc out of the protective shell 1, and the filling arc-extinguishing part is used to prevent the arc from spreading inside the protective shell 1.

[0020] The protective shell 1 is made of high-temperature resistant and insulating materials such as ceramics and glass fiber reinforced plastics. It also has high mechanical strength and good heat resistance, which can withstand the high temperature and impact generated when the fuse blows, while ensuring the insulation performance of the circuit and preventing short circuits and leakage accidents.

[0021] The electrode 2 is electrically connected with the fuse 4, and the electrode 2 is provided with a through hole 3 for connecting an external lead wire.

[0022] The electrode 2 is made of a metal material with good electrical conductivity, such as copper or aluminum, and is subjected to silver plating or tin plating treatment on the surface to reduce the contact resistance and improve the electrical conductivity and oxidation resistance.

[0023] The fuse 4 is made of a metal material, such as silver or copper, or an alloy thereof, and has good electrical conductivity and a low melting point, so that the fuse 4 can be rapidly fused and cut off the circuit when an overload or a short circuit occurs.

[0024] The outer periphery of the fuse 4 is provided with a plurality of annular grooves 8. The annular grooves 8 are located in the conduit 7, and the partial narrow design of the annular grooves 8 increases the current density, so that the heat is concentrated at the annular grooves 8, and the rupture occurs only at this position when the fuse is fused, thereby avoiding random fusing.

[0025] As shown in Figure 2 , the filled arc extinguishing part includes an arc extinguishing chamber 6 and a conduit 7, the fuse 4 is located in the arc extinguishing chamber 6, the conduit 7 passes through the arc extinguishing chamber 6, and the fuse 4 penetrates the conduit 7.

[0026] The arc extinguishing chamber 6 is filled with a substance, such as quartz sand or ceramic powder, which has good insulation and heat dissipation properties, so that the diffusion of the electric arc generated when the fuse is fused can be effectively prevented.

[0027] The conduit 7 is fixedly provided with a separation net 10 at one end of the outer wall of the protective shell 1.

[0028] The separation net 10 is made of a material, such as ceramic or glass fiber reinforced plastic, which is resistant to high temperature, and prevents external substances from entering the conduit 7 and affecting the electrical conductivity and fusing performance of the fuse 4.

[0029] The conduit 7 is made of glass fiber reinforced plastic, which has good insulation properties.

[0030] The air blowing arc extinguishing part includes an air chamber 5 and an air balloon 9, the other end of the conduit 7 extends into the air chamber 5, the air balloon 9 is located in the air chamber 5 and is fixedly connected with the other end of the conduit 7. The inner cavity of the air balloon 9 is in communication with the conduit 7, and a gas separation sheet 11 is used to block the gas in the air balloon 9. The gas separation sheet 11 is provided with an air inlet, and a rubber plug is inserted into the air inlet to block the air inlet.

[0031] After the air balloon 9 is filled with gas, the volume of the air balloon 9 fills the air chamber 5, the air chamber 5 protects the air balloon 9 from being damaged by external objects, and prevents the air balloon 9 from being over-inflated. After the air balloon 9 is filled with gas, the air pressure is 0.6 MPa.

[0032] The balloon 9 and the air isolation sheet 11 are made of synthetic rubber, which is flexible and has a melting point of 180-200℃. The fuse will not accelerate the aging of the balloon 9 and the air isolation sheet 11 when it is in normal operation, but when the fuse is melted, the temperature of the electric arc generated by the fuse 4 can reach several thousand degrees Celsius, which is much higher than the melting point of the air isolation sheet 11. The air isolation sheet 11 is melted, and the gas in the balloon 9 is sprayed out of the conduit 7, which blows away the electric arc.

[0033] The gas blowing arc extinguishing part further comprises an air isolation sheet 11 fixed in the other end of the conduit 7. The air isolation sheet 11 is close to the fuse 4 but not in contact with it, which prevents the fuse 4 from conducting electricity and heating to age the air isolation sheet 11 and reduce the sealing of the conduit 7.

[0034] High-pressure air or inert gas such as nitrogen is filled into the balloon 9 from the air inlet of the air isolation sheet 11, and a rubber plug is inserted after the inflation is completed. When a short circuit occurs in the circuit or the short circuit causes the current flowing through the fuse 4 to suddenly increase, the fuse 4 generates a large amount of heat and melts at the annular groove 8. The electric arc generated by the melted fuse 4 melts the air isolation sheet 11, and the gas in the balloon 9 is sprayed out of the conduit 7, which blows away the electric arc along the conduit 7, avoids the existence of the electric arc for a long time, and prevents the fuse 4 from cutting off the current in the circuit in time, thereby avoiding the thermal damage of the circuit components caused by the electric arc.

[0035] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the present application. Any modification, equivalent change and modification of the above-mentioned technical content, which does not depart from the technical solution of the present application, is still within the scope of the present application.

Claims

1. A new high-voltage fuse for new energy vehicles, comprising a protective shell (1), electrodes (2) fixed at both ends of the protective shell (1), and a fuse body (4) fixed between the two electrodes (2), characterized in that, The arc extinguishing device further comprises a blowing arc extinguishing part and a filling arc extinguishing part, both of which are arranged inside the protection shell (1), the blowing arc extinguishing part blows the arc out of the protection shell (1) when the arc is generated by the fuse (4), and the filling arc extinguishing part prevents the arc from spreading inside the protection shell (1).

2. The new energy vehicle high-voltage fuse according to claim 1, characterized in that, The electrode (2) is electrically connected with the fuse (4), and a through hole (3) for connecting an external lead wire is arranged on the electrode (2).

3. The new energy vehicle high-voltage fuse according to claim 1, characterized in that, An outer ring of the fuse (4) is provided with a plurality of annular grooves (8).

4. The new energy vehicle high-voltage fuse according to claim 1, characterized in that, The filling arc extinguishing part comprises an arc extinguishing cavity (6) and a guide pipe (7), the fuse (4) is arranged in the arc extinguishing cavity (6), the guide pipe (7) is transversely arranged in the arc extinguishing cavity (6), and the fuse (4) penetrates the guide pipe (7).

5. The new energy vehicle high-voltage fuse according to claim 4, characterized in that, An isolation net (10) is fixedly arranged in one end of the guide pipe (7) located outside the outer wall of the protection shell (1).

6. The new energy vehicle high-voltage fuse according to claim 4, characterized in that, The blowing arc extinguishing part comprises an air cavity (5) and an air ball (9), the other end of the guide pipe (7) extends into the air cavity (5), and the air ball (9) is arranged in the air cavity (5) and is fixedly connected with the other end of the guide pipe (7).

7. The new energy vehicle high-voltage fuse according to claim 1, characterized in that, The blowing arc extinguishing part further comprises an air isolation sheet (11) which is fixedly arranged in the other end of the guide pipe (7).

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