An energized fuse with passive protection function

Abstract

The utility model discloses an excitation fuse with passive protection function, including at least one main circuit, at least one main circuit has cut off action device in series, bimetallic strip switch is in series in at least one main circuit and is located cut off action device one side, bimetallic strip switch and its one side main circuit connection cut off action device constitute signal loop, and signal loop can carry out electric signal ignition to cut off action device. Hot bimetallic strip is as the trigger device of passive protection, when fault current passes, conductor temperature rises, and hot bimetallic strip is bent, and the signal loop or tripping transmission trigger signal makes main circuit be cut off, and the response speed of excitation fuse has been improved.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to an excitation fuse with passive protection function. Background Technology

[0002] An excitation fuse works by detonating gunpowder to generate a high-pressure impact, which then drives a mechanical device to cut off the circuit. It mainly consists of an excitation module, an execution module, and an arc-extinguishing device. The excitation module receives an excitation signal and then explodes to generate a high-pressure impact. Excitation signal acquisition methods are typically divided into external active excitation and internal passive excitation. The execution module uses the thrust of the high-pressure impact to drive a piston or knife switch, cutting off the main circuit's conductive components and disconnecting the circuit. The arc-extinguishing device, after cutting off the high-pressure current and generating a large electric arc, uses a small arc-extinguishing fuse or grid to transfer and absorb the arc's energy.

[0003] In existing technologies, most passive excitation circuit protection devices trigger explosions by using a front-end series signal fuse. The fuse blows, generating an arc signal that triggers the explosion. However, in this type of excitation fuse, the signal fuse element needs to maintain normal current-carrying capacity and withstand current surges, and it must also blow under abnormal current conditions. Therefore, its short-circuit protection lower limit is relatively high, and its operating time is relatively long under low fault currents. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the above-mentioned excitation fuses, which have a high lower limit for short circuit protection and a long operating time under low fault current. This invention provides an excitation fuse with passive protection function. The thermal bimetallic strip serves as the triggering device for passive protection. When a fault current passes through, the conductor temperature rises, the thermal bimetallic strip bends, and the signal circuit is connected or the tripping signal is transmitted to cut off the main circuit, thereby improving the response speed of the excitation fuse.

[0005] Technical solution

[0006] To achieve the above technical objectives, this utility model provides an excitation fuse with passive protection function.

[0007] An excitation fuse with passive protection function includes at least one main circuit, a disconnection device connected in series in the at least one main circuit, a bimetallic switch connected in series in the at least one main circuit on one side of the disconnection device, the bimetallic switch and the main circuit on one side of it connected to the disconnection device to form a signal circuit, the signal circuit being able to ignite the disconnection device with an electrical signal.

[0008] Preferably, one end of the bimetallic strip is connected in series with the at least one main circuit, and the other end is connected in series with the signal circuit.

[0009] Preferably, the bimetallic switch and its main circuit on one side are connected back to the electrode pair in the cut-off action device.

[0010] Preferably, the electrode pair is a tungsten electrode pair.

[0011] Preferably, it includes at least one main circuit, on which a cutting-off device is connected in series, and a bimetallic strip assembly is connected in series on the at least one main circuit and located on one side of the cutting-off device. The bimetallic strip assembly is connected to a transmission assembly, and the bimetallic strip assembly is linked to an ignition device on the cutting-off device through the transmission assembly.

[0012] Preferably, one end of the bimetallic strip assembly is connected in series with the at least one main circuit, and the other end is linked with the transmission assembly.

[0013] Preferably, the transmission assembly includes an energy storage spring and a buckle. One end of the energy storage spring is connected to one end of the buckle, and the other end of the buckle is linked to the bimetallic strip assembly. During the movement of the other end of the energy storage spring, it can drive the lever mechanism to move, thereby impacting and igniting the ignition device.

[0014] Beneficial effects

[0015] This utility model provides an excitation fuse with passive protection function, comprising at least one main circuit, on which a disconnection device is connected in series. A bimetallic switch is connected in series on the at least one main circuit, located on one side of the disconnection device. The bimetallic switch and the main circuit on one side of it are connected back to the disconnection device to form a signal circuit, which can provide an electrical signal to ignite the disconnection device. The thermal bimetallic strip acts as a triggering device for passive protection. When a fault current passes through, the conductor temperature rises, the thermal bimetallic strip bends, and the signal circuit is activated or tripped, transmitting a trigger signal to disconnect the main circuit, thus improving the response speed of the excitation fuse. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Appendix Figure 1 This is a connection diagram of Embodiment 1 of this utility model;

[0018] Appendix Figure 2 This is a connection diagram of Embodiment 2 of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0024] Example 1

[0025] As attached Figure 1As shown, an excitation fuse with passive protection function includes at least one main circuit 1, on which a cutting-off device 2 is connected in series. A bimetallic switch 3 is connected in series on the at least one main circuit 1, located on one side of the cutting-off device 2. The bimetallic switch 3 and the main circuit 1 on one side are connected back to the cutting-off device 2 to form a signal circuit 4, which can ignite the cutting-off device 2 with an electrical signal. Specifically, one end of the bimetallic strip is connected in series on the at least one main circuit 1, and the other end is connected in series in the signal circuit 4. The bimetallic switch 3 and the main circuit 1 on one side are connected back to the electrode pair 5 in the cutting-off device 2. The electrode pair 5 is a tungsten electrode pair.

[0026] In this embodiment, the bimetallic switch 3 is connected in series in at least one main circuit 1. Utilizing the different coefficients of thermal expansion of different metals, when the temperature changes, the higher expansion layer expands more than the lower expansion layer, causing the bimetallic strip to bend as a whole. This response time is shorter than the melting time of a molten metal, thus reducing the action time. The specific reaction time is as follows:

[0027] Bimetallic strip bending time:

[0028] Where C is the specific heat capacity of the material, ρ is the density, d is the thickness of the bimetallic strip, k is the thermal conductivity, and ΔT is the temperature change.

[0029] Under normal operating conditions, current flows through the main circuit, and bimetallic switch 3 remains open.

[0030] When a fault current occurs, the temperature rises and the bimetallic strip deforms, generating a voltage signal that is transmitted to electrode pair 5 to generate an electric spark that ignites the gas explosion and pushes the cut-off device 2 to cut off the main circuit.

[0031] Example 2

[0032] As attached Figure 2 As shown, an excitation fuse with passive protection function includes at least one main circuit 1, a cutting-off device 2 connected in series on the at least one main circuit 1, and a bimetallic strip assembly 6 connected in series on the at least one main circuit 1 and located on one side of the cutting-off device 2. The bimetallic strip assembly 6 is connected to a transmission assembly 7, and the bimetallic strip assembly 6 is linked to an ignition device on the cutting-off device 2 through the transmission assembly 7.

[0033] Specifically, one end of the bimetallic strip assembly 6 is connected in series with at least one main circuit 1, and the other end is linked with the transmission assembly 7. The transmission assembly 7 includes an energy storage spring, and a latch is added between the two: one end of the energy storage spring is connected to the lever mechanism, the other end of the energy storage spring is linked to one end of the latch device, and the other end of the latch device is linked to the hot bimetallic strip. When the hot bimetallic strip is heated and bent, it causes the latch to unlock and release the energy storage spring. During the movement of the energy storage spring, it can drive the lever mechanism 9 to move, thereby impacting and igniting the ignition device.

[0034] In this embodiment, when an abnormal current passes through, the hot bimetallic strip bends and deforms, which serves as a trigger signal to leave the energy storage spring. The movement of the energy storage spring drives the lever mechanism 9 to rotate. During the rotation of the lever mechanism 9, one end strikes the ignition device to detonate the gas generator, which in turn pushes the piston rod in the cutting-off action device 2 to move and cut off the main circuit 1.

[0035] This utility model provides an excitation fuse with passive protection function, including at least one main circuit 1. A disconnection device 2 is connected in series on the at least one main circuit 1. A bimetallic switch 3 is connected in series on the at least one main circuit 1 and located on one side of the disconnection device 2. The bimetallic switch 3 and the main circuit 1 on its side are connected back to the disconnection device 2 to form a signal circuit 4. The signal circuit 4 can provide an electrical signal ignition to the disconnection device 2. The thermal bimetallic strip acts as a triggering device for passive protection. When a fault current passes through, the conductor temperature rises, the thermal bimetallic strip bends, and the signal circuit is opened or a tripping transmission (the bimetallic strip assembly 6 is mechanically tripped) triggers a signal, causing the main circuit to be disconnected, thus improving the response speed of the excitation fuse.

[0036] In Example 1, the bimetallic switch 3 is activated by deformation of the electrical signal, while in Example 2, the bimetallic assembly 6 is activated by deformation of the mechanical movement that releases the latch.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An energized fuse having a passive protection function, characterized in that: The application relates to a circuit comprising at least one main circuit (1) with a cut-off action device (2) connected in series, a bimetallic switch (3) connected in series on the main circuit (1) on one side of the cut-off action device (2), the bimetallic switch (3) and the main circuit (1) on one side thereof connected to the cut-off action device (2) form a signal circuit (4), and the signal circuit (4) can ignite the cut-off action device (2) by an electric signal.

2. An energized fuse with passive protection function as claimed in claim 1, characterized in that: One end of the bimetallic switch (3) is connected in series on the main circuit (1), and the other end is connected in series in the signal circuit (4).

3. An energized fuse with a passive protection function as claimed in claim 1, characterized in that: The bimetallic switch (3) and the main circuit (1) on one side thereof are connected to an electrode pair (5) in the cut-off action device (2).

4. An energized fuse with a passive protection function as claimed in claim 1, characterized in that: The electrode pair (5) is a tungsten electrode pair.

5. An energized fuse having a passive protection function, characterized by: The application relates to a circuit comprising at least one main circuit (1) with a cut-off action device (2) connected in series, a bimetallic switch assembly (6) connected in series on the main circuit (1) on one side of the cut-off action device (2), a transmission assembly (7) connected to the bimetallic switch assembly (6), and the bimetallic switch assembly (6) is connected to an ignition device on the cut-off action device (2) through the transmission assembly (7).

6. An energized fuse with a passive protection function according to claim 5, characterized in that: One end of the bimetallic switch assembly (6) is connected in series on the main circuit (1), and the other end is connected to the transmission assembly (7).

7. An energized fuse with passive protection function as claimed in claim 6, characterized in that: The transmission assembly (7) comprises an energy storage spring and a buckle, one end of the energy storage spring is connected to one end of the buckle, the other end of the buckle is connected to the bimetallic switch assembly (6), and the other end of the energy storage spring can drive a lever mechanism (9) to act on the ignition device to impact and ignite the ignition device during movement.

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