An arc extinguishing module and circuit protection device

Abstract

The application relates to an arc extinguishing module and a circuit protection device, and relates to the technical field of low-voltage electricity. The arc extinguishing module comprises a signal fuse, a pre-break and an arc extinguishing fuse; the signal fuse and the pre-break are arranged in series on a main circuit, and the arc extinguishing fuse is arranged in parallel with the pre-break; the arc extinguishing module further comprises a magnetic thermal sensitive element and a cutting element which are magnetically connected, the magnetic thermal sensitive element is thermally coupled with the signal fuse; the cutting element corresponds to the position of the arc extinguishing fuse; after the signal fuse is fused, the pre-break is disconnected, and the heat generated by the signal fuse being fused causes the magnetic thermal sensitive element to be demagnetized, so as to drive the cutting element to move towards the arc extinguishing fuse and cut off the arc extinguishing fuse. The arc extinguishing module can improve arc extinguishing reliability, and further improve equipment use safety.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically, to an arc extinguishing module and a circuit protection device. Background Technology

[0002] In circuit protection devices, arc-extinguishing modules are used to quickly extinguish the electric arc when the circuit is broken, preventing equipment damage and safety accidents. Currently, common arc-extinguishing modules typically employ a structure with arc-extinguishing welding wires connected in parallel at both ends of the pre-break. When the pre-break in the main circuit is cut, the current is transferred to the arc-extinguishing welding wire branch, causing it to melt and the energy is absorbed by the arc-extinguishing material (such as silica sand) to extinguish the arc.

[0003] Existing arc extinguishing modules can extinguish arcs quickly and reliably under high current conditions; however, under low short-circuit current conditions, the arc extinguishing welding wire may not melt in time due to insufficient current, or the melting time may be significantly prolonged, resulting in the arc persisting and failing to achieve rapid and complete severance, which may lead to equipment damage or even safety accidents, thus reducing the reliability of arc extinguishing. Utility Model Content

[0004] The purpose of this utility model is to provide an arc extinguishing module and a circuit protection device, which can improve the reliability of arc extinguishing and thus improve the safety of equipment use.

[0005] The embodiments of this utility model are implemented as follows: In one aspect, this utility model provides an arc-extinguishing module, including a signal fuse, a pre-break, and an arc-extinguishing fuse; the signal fuse and the pre-break are connected in series in the main circuit, and the arc-extinguishing fuse and the pre-break are connected in parallel; the arc-extinguishing module also includes a magnetically connected magnetic thermistor and a cutting element, the magnetic thermistor and the signal fuse being thermally coupled; the cutting element is positioned corresponding to the arc-extinguishing fuse; after the signal fuse melts, the pre-break opens, and the heat generated by the melting of the signal fuse demagnetizes the magnetic thermistor, thereby driving the cutting element to move toward the arc-extinguishing fuse and cut the arc-extinguishing fuse.

[0006] Optionally, the arc extinguishing module also includes an elastic energy storage element and a rotatable lever, with the elastic energy storage element and the lever connected; the first end of the lever is connected to the cutting element, and the end of the elastic energy storage element away from the lever is fixedly disposed; the elastic energy storage element is used to provide torque to the first end of the lever to move toward the arc extinguishing fuse; a magnetic thermistor is disposed at a distance from the lever, and the magnetism of the magnetic thermistor can overcome the torque of the elastic energy storage element to keep the lever in the adsorption position and balance the lever.

[0007] Optionally, the arc extinguishing module also includes a limiting block fixedly disposed at the second end of the lever, and the second end of the lever is fixedly connected to the limiting block; when the magnetic thermal element is demagnetized by heat, the limiting block is used to restrict the rotation of the second end of the lever.

[0008] Optionally, the magnetic thermistor is positioned opposite the second end of the lever, the lever is spaced between the arc-extinguishing fuse and the magnetic thermistor, the elastic energy storage element is located at the second end of the lever and on the side of the lever away from the magnetic thermistor, and the elastic energy storage element and the cutting element are both located on the same side of the lever.

[0009] Optionally, the magnetic thermistor is positioned opposite the second end of the lever, the lever is spaced between the arc-extinguishing fuse and the magnetic thermistor, the elastic energy storage element is located at the first end of the lever and on the side of the lever closest to the magnetic thermistor, and the elastic energy storage element and the cutting element are located on opposite sides of the lever.

[0010] Optionally, the magnetic thermistor is positioned opposite the first end of the lever, the lever is spaced between the arc-extinguishing fuse and the pre-break, and the magnetic thermistor is located on the side of the lever away from the arc-extinguishing fuse; the elastic energy storage element is located on the side of the lever away from the arc-extinguishing fuse, and the cutting element is located on the side of the lever away from the elastic energy storage element.

[0011] Optionally, the magnetic thermistor is spaced between the pre-break and the arc-extinguishing fuse, and the cutting element is attracted to the magnetic thermistor by the magnetism of the magnetic thermistor.

[0012] Optionally, the arc extinguishing module also includes a heat-conducting sheet disposed between the signal fuse and the magnetic thermistor, wherein the magnetic thermistor and the signal fuse are thermally coupled through the heat-conducting sheet.

[0013] Optionally, the heat-conducting sheet has a first connecting end and a second connecting end that are bent. The first connecting end is located between the signal fuse and the pre-break and is connected to the main circuit, while the second connecting end is in contact with the magnetic thermistor.

[0014] In another aspect, this utility model provides a circuit protection device, including the aforementioned arc-extinguishing module.

[0015] The beneficial effects of this utility model include: This application provides an arc extinguishing module, including a signal fuse, a pre-break, and an arc extinguishing fuse. The signal fuse and the pre-break are connected in series in the main circuit, allowing the signal fuse to directly and in real-time sense the current changes in the main circuit, avoiding untimely arc extinguishing due to signal transmission delay. The arc extinguishing fuse and the pre-break are connected in parallel. The arc extinguishing module also includes a magnetically connected magnetic thermistor and a cutting element. The magnetic thermistor and the signal fuse are thermally coupled. Compared with the single driving method of the existing technology that relies on current to blow the arc extinguishing fuse, this application has the characteristics of structural stability and rapid response through magnetic connection. The thermal sensitivity of the magnetic thermistor can accurately sense the heat change, and then drive the mechanical action of the cutting element through the heat signal, rather than relying solely on the current magnitude to drive the mechanical action of the cutting element. Even under low current, it can still effectively drive the cutting element to disconnect the arc extinguishing fuse to achieve arc extinguishing. The cutting element and the arc extinguishing fuse are positioned correspondingly. After the signal fuse melts, it disconnects from the pre-break, and the heat generated by the melting of the signal fuse demagnetizes the magnetic thermistor, thereby driving the cutting element to move towards the arc extinguishing fuse and cut the arc extinguishing fuse. The aforementioned arc extinguishing module can improve the reliability of arc extinguishing, thereby improving the safety of equipment use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model 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] Figure 1 One of the structural schematic diagrams of the arc extinguishing module provided in the embodiment of this utility model; Figure 2 This is the second schematic diagram of the arc extinguishing module provided in the embodiment of the present utility model; Figure 3 The third schematic diagram of the arc extinguishing module provided in this embodiment of the utility model; Figure 4 The fourth schematic diagram of the arc extinguishing module provided in this embodiment of the utility model; Figure 5 Fifth schematic diagram of the arc extinguishing module provided in this embodiment of the utility model; Figure 6 Sixth schematic diagram of the arc extinguishing module provided in this embodiment of the utility model; Figure 7 The seventh schematic diagram of the arc extinguishing module provided in this embodiment of the utility model; Figure 8 This is the eighth schematic diagram of the arc extinguishing module provided in the embodiment of this utility model.

[0018] Icons: 100-Arc extinguishing module; 101-Main circuit; 110-Signal fuse; 120-Pre-break; 130-Arc extinguishing fuse; 140-Magnetic thermistor; 150-Cutting component; 160-Heat conductive plate; 161-First connection end; 162-Second connection end; 170-Elastic energy storage component; 180-Lever; 181-First end; 182-Second end; 190-Limit block. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0022] Please refer to Figure 1 This embodiment provides an arc extinguishing module 100, including a signal fuse 110, a pre-break 120, and an arc extinguishing fuse 130. The signal fuse 110 and the pre-break 120 are connected in series on the main circuit 101, and the arc extinguishing fuse 130 is connected in parallel with the pre-break 120. The arc extinguishing module 100 also includes a magnetically connected magnetic thermistor 140 and a cutting element 150, which are thermally coupled to the signal fuse 110. The cutting element 150 is positioned corresponding to the arc extinguishing fuse 130. After the signal fuse 110 melts, the pre-break 120 is opened, and the heat generated by the melting of the signal fuse 110 demagnetizes the magnetic thermistor 140, thereby driving the cutting element 150 to move toward the arc extinguishing fuse 130 and cut off the arc extinguishing fuse 130.

[0023] Specifically, such as Figure 1As shown, the arc-extinguishing module 100 includes a signal fuse 110 and a pre-break 120 sequentially arranged in series in the main circuit 101. A branch is connected in parallel to both ends of the pre-break 120, and the arc-extinguishing fuse 130 is disposed on the branch. The main circuit 101 is the core path for current flow. When a low-multiplier short-circuit current passes through the main circuit 101, the signal fuse 110 is designed to respond quickly and melt, avoiding untimely arc extinguishing due to signal transmission delay and improving arc extinguishing reliability. The signal fuse 110 is connected in series with the pre-break 120, so that the melting action of the signal fuse 110 can form a preliminary linkage with the breaking of the pre-break 120. Preferably, an ignition device for quickly cutting off the pre-break 120 is provided at the pre-break 120. When the signal fuse 110 melts due to the heat generated by the low-multiple short-circuit current, it can transmit a trigger signal to the ignition device, causing the ignition device to respond quickly and start its action, cutting off the pre-break 120 in a very short time and completing the preliminary breaking of the main circuit 101.

[0024] Under high current conditions, after the pre-break 120 is cut off, the high current in the main circuit 101 will be quickly transferred to the parallel branch. At this time, the arc-extinguishing fuse 130 set on the branch can be quickly melted by the heat generated by the high current, and the arc-extinguishing material around the arc-extinguishing fuse 130 absorbs the energy to achieve arc extinguishing.

[0025] To prevent the arc-extinguishing fuse 130 from failing to melt in time or having a significantly prolonged melting time due to insufficient current under low short-circuit current conditions, thus ensuring the arc persists and preventing rapid and complete disconnection, such as... Figure 1 As shown, the arc-extinguishing module 100 also includes a magnetic thermistor 140 and a cut-off element 150. Under normal conditions, the magnetic thermistor 140 uses magnetic attraction to limit the cut-off element 150, keeping it in a non-working position. When the magnetic thermistor 140 is heated, its magnetism disappears, and the cut-off element 150 is no longer attracted by the magnetic thermistor 140 and enters the working state, moving towards the arc-extinguishing fuse 130 and cutting off the arc-extinguishing fuse 130.

[0026] The magnetic thermistor 140 is thermally coupled to the signal fuse 110. The melting of the signal fuse 110 is the initial signal of a circuit malfunction. Through thermal coupling, this malfunction signal can be converted into a temperature signal, which then triggers a change in the magnetism of the magnetic thermistor 140. This linkage effectively eliminates interference from external heat or signals, ensuring that the magnetic thermistor 140 only activates when the main circuit 101 truly needs to be disconnected. This improves the accuracy of arc extinguishing control and avoids unnecessary arc extinguishing caused by false triggering.

[0027] It should be noted that this application does not impose any restrictions on the thermal coupling form between the magnetic thermistor 140 and the signal fuse 110. The magnetic thermistor 140 and the signal fuse 110 can achieve thermal coupling through direct contact or through a thermally conductive material, as long as it can ensure that the heat generated when the fuse melts can be transferred to the magnetic thermistor 140 quickly and with minimal loss.

[0028] Optionally, such as Figures 1 to 8 As shown, the arc extinguishing module 100 also includes a heat-conducting sheet 160 disposed between the signal fuse 110 and the magnetic thermistor 140, with the magnetic thermistor 140 and the signal fuse 110 thermally coupled through the heat-conducting sheet 160. Preferably, the heat-conducting sheet 160 is made of a material with high thermal conductivity, such as copper, aluminum, or ceramic, to optimize heat transfer efficiency and avoid electrical interference or structural conflicts that may occur from direct contact between the signal fuse 110 and the magnetic thermistor 140.

[0029] For example, such as Figures 1 to 8 As shown, the heat-conducting sheet 160 has a first connecting end 161 and a second connecting end 162 that are bent. The first connecting end 161 is located between the signal fuse 110 and the pre-break 120 and is connected to the main circuit 101. The second connecting end 162 is in contact with the magnetic thermistor 140. This application does not impose any restrictions on the bending angle of the heat-conducting sheet 160; it can be bent at 90 degrees, 120 degrees, or other angles, as long as the first connecting end 161 and the second connecting end 162 can extend to the connection point between the signal fuse 110 and the pre-break 120, and the mounting position of the magnetic thermistor 140, respectively. Figure 1 As shown, the heat-conducting sheet 160 is bent at a 90-degree angle. This bent structure of the heat-conducting sheet 160 allows for adjustment of its shape according to the actual position of the component, bypassing obstructions from other components. This eliminates the need to drastically alter the functional layout of core components to accommodate the heat-conducting sheet 160, significantly improving the flexibility of the module's internal structural design, especially for meeting the compact space requirements of miniaturized circuit protection devices.

[0030] The aforementioned arc-extinguishing module 100 includes a signal fuse 110, a pre-break 120, and an arc-extinguishing fuse 130. The signal fuse 110 and the pre-break 120 are connected in series on the main circuit 101, enabling the signal fuse 110 to directly and in real-time sense the current changes in the main circuit 101, avoiding untimely arc extinguishing due to signal transmission delays. The arc-extinguishing fuse 130 is connected in parallel with the pre-break 120. The arc-extinguishing module 100 also includes a magnetically connected magnetic thermistor 140 and a cutting element 150. The magnetic thermistor 140 and the signal fuse 110 are thermally coupled. Compared to the single driving method of relying on current to fuse the arc-extinguishing fuse 130 in the prior art, this application uses a magnetic connection method... This design features stable structure and rapid response. The magnetic thermistor 140 accurately senses heat changes and drives the mechanical action of the cutting element 150 via a heat signal, rather than relying solely on current magnitude. Even under low current, it can effectively drive the cutting element 150 to disconnect the arc-extinguishing fuse 130 and extinguish the arc. The cutting element 150 and the arc-extinguishing fuse 130 are positioned correspondingly. After the signal fuse 110 melts, the pre-break 120 opens, and the heat generated by the melting of the signal fuse 110 demagnetizes the magnetic thermistor 140, driving the cutting element 150 to move towards and cut the arc-extinguishing fuse 130. The aforementioned arc-extinguishing module 100 improves arc-extinguishing reliability, thereby enhancing equipment safety.

[0031] In one possible implementation of this application, such as Figures 1 to 6 As shown, the arc extinguishing module 100 also includes an elastic energy storage element 170 and a rotatably configured lever 180, with the elastic energy storage element 170 and the lever 180 connected. The first end 181 of the lever 180 is connected to the cut-off element 150, and the second end 182 is connected to the elastic energy storage element 170. The end of the elastic energy storage element 170 away from the lever 180 is fixedly configured. The elastic energy storage element 170 is used to provide torque to the first end 181 of the lever 180 to move toward the arc extinguishing fuse 130. The magnetic thermistor 140 is arranged at a distance from the lever 180. The magnetism of the magnetic thermistor 140 can overcome the torque of the elastic energy storage element 170 to keep the second end 182 of the lever 180 in the adsorption position, so that the lever 180 is balanced.

[0032] Specifically, one end of the elastic energy storage element 170 is fixedly disposed, and the other end is connected to the lever 180; while the first end 181 of the lever 180 is connected to the cut-off element 150; both the elastic energy storage element 170 and the lever 180 are made of ferromagnetic material. In one specific embodiment of this application, such as Figure 1 , Figure 3As shown, the elastic energy storage element 170 is a tension spring. When the magnetic thermal element 140 is magnetic, the magnetic attraction provided by the magnetic thermal element 140 to the elastic energy storage element 170 causes the elastic energy storage element 170 to be stretched, so that the lever 180 is in a balanced position. At this time, the cutting element 150 and the arc extinguishing fuse 130 are arranged opposite each other and have a preset interval.

[0033] like Figure 2 , Figure 4 As shown, when the magnetic thermal element 140 is demagnetized by heat, the elastic energy storage element 170 is no longer subject to magnetic attraction and returns to its natural state. At this time, the lever 180 is provided with torque by the pulling force of the elastic energy storage element 170, which causes the first end 181 of the lever 180 to move toward the arc-extinguishing fuse 130, so that the cutting element 150 rotates toward the arc-extinguishing fuse 130 and cuts off the arc-extinguishing fuse 130.

[0034] In another possible implementation of this application, such as Figure 5 As shown, the elastic energy storage element 170 is a compression spring. When the magnetic thermistor 140 is magnetic, the magnetic attraction lever 180 provided by the magnetic thermistor 140 compresses the elastic energy storage element 170, bringing the lever 180 to a balanced position. At this time, the cutting element 150 and the arc-extinguishing fuse 130 are arranged opposite each other with a preset interval. Figure 6 As shown, when the magnetic thermistor 140 is demagnetized by heat, the lever 180 is no longer subject to magnetic attraction, and the elastic energy storage element 170 is no longer subject to the pressure of the lever 180 and returns to its natural state. At this time, the lever 180 is provided with torque by the reset force of the elastic energy storage element 170, which causes the first end 181 of the lever 180 to move toward the arc-extinguishing fuse 130, so that the cutting element 150 rotates toward the arc-extinguishing fuse 130 and cuts off the arc-extinguishing fuse 130.

[0035] By setting up lever 180 and elastic energy storage component 170, the elastic potential energy of elastic energy storage component 170 can be converted into the torque required by cutting component 150, reducing the dispersion and loss of energy during the transmission process and ensuring that cutting component 150 obtains sufficient cutting force. At the same time, lever 180 has high structural flexibility and can avoid other components in a limited space by adjusting the position of the rotating shaft and the length of lever 180. Elastic energy storage component 170 is small in size and flexible in installation method, without occupying a lot of space, which helps to miniaturize the arc extinguishing module 100 and makes it easier to integrate into various circuit protection devices.

[0036] Optionally, such as Figures 1 to 8 As shown, the arc extinguishing module 100 also includes a limiting block 190 fixedly disposed on the second end 182 of the lever 180, and the second end 182 of the lever 180 is fixedly connected to the limiting block 190; when the magnetic thermal element 140 is demagnetized by heat, the limiting block 190 is used to restrict the rotation of the second end 182 of the lever 180.

[0037] In one specific configuration of this application, the limiting block 190 is fixedly installed, and its surface is provided with a limiting groove for engaging the second end 182 of the lever 180. In another specific configuration of this application, the limiting block 190 has a through hole along the extension direction of the lever 180, and the through hole is used to engage the second end 182 of the lever 180. Of course, in addition to the above configurations, the limiting block 190 can also be in other configurations, as long as it can limit the second end 182 of the lever 180.

[0038] When the magnetic thermistor 140 is demagnetized by heat, the elastic energy storage element 170 returns to its natural state, no longer subject to magnetic attraction. Because the second end 182 of the lever 180 is limited by the limiting block 190, it remains fixed. At this time, the lever 180, driven by the elastic energy storage element 170, provides torque to its first end 181, causing it to move towards the arc-extinguishing fuse 130. This causes the cutting element 150 to rotate towards and cut the arc-extinguishing fuse 130. This configuration allows the elastic energy storage element 170 to more precisely drive the first end 181 of the lever 180, avoiding the possibility that the second end 182 of the lever 180 might rotate simultaneously when the elastic energy storage element 170 resets, preventing the cutting element 150 from reliably and quickly cutting the arc-extinguishing fuse 130. This further improves the reliability and accuracy of the cutting element 150 in cutting the arc-extinguishing fuse 130.

[0039] Optionally, such as Figure 1 As shown, the magnetic thermistor 140 and the second end 182 of the lever 180 are positioned opposite each other. The lever 180 is spaced between the arc-extinguishing fuse 130 and the magnetic thermistor 140. The elastic energy storage element 170 is located at the second end 182 of the lever 180 and on the side of the lever 180 away from the magnetic thermistor 140. The elastic energy storage element 170 and the cutting element 150 are both located on the same side of the lever 180. That is, the elastic energy storage element 170, the magnetic thermistor 140, the lever 180, and the cutting element 150 are all located below the arc-extinguishing fuse 130. When the magnetic thermistor 140 is magnetic, the magnetic attraction provided by the magnetic thermistor 140 causes the elastic energy storage element 170 to be stretched, bringing the lever 180 to a balanced position. At this time, the cutting element 150 is positioned opposite the arc-extinguishing fuse 130 with a preset interval. Figure 2 As shown, when the magnetic thermal element 140 is demagnetized by heat, the elastic energy storage element 170 is no longer subject to magnetic attraction and returns to its natural state. At this time, the lever 180 is provided with torque by the pulling force of the elastic energy storage element 170, which causes the first end 181 of the lever 180 to move toward the arc-extinguishing fuse 130, so that the cutting element 150 rotates toward the arc-extinguishing fuse 130 and cuts off the arc-extinguishing fuse 130.

[0040] Optionally, such as Figure 5 and Figure 6As shown, the magnetic thermistor 140 and the second end 182 of the lever 180 are positioned opposite each other. The lever 180 is spaced between the arc-extinguishing fuse 130 and the magnetic thermistor 140. The elastic energy storage element 170 is located at the first end 181 of the lever 180 and is located on the side of the lever 180 closest to the magnetic thermistor 140. The elastic energy storage element 170 and the cutting element 150 are located on opposite sides of the lever 180. That is, the elastic energy storage element 170, the magnetic thermistor 140, the lever 180, and the cutting element 150 are all located below the arc-extinguishing fuse 130. Figure 5 As shown, when the magnetic thermistor 140 is magnetic, the magnetic attraction lever 180 provided by the magnetic thermistor 140 compresses the elastic energy storage element 170, bringing the lever 180 to a balanced position. At this time, the cutting element 150 and the arc-extinguishing fuse 130 are arranged opposite each other and have a preset interval. Figure 6 As shown, when the magnetic thermistor 140 is demagnetized by heat, the lever 180 is no longer subject to magnetic attraction, and the elastic energy storage element 170 is no longer subject to the pressure of the lever 180 and returns to its natural state. At this time, the lever 180 is provided with torque by the reset force of the elastic energy storage element 170, which causes the first end 181 of the lever 180 to move toward the arc-extinguishing fuse 130, so that the cutting element 150 rotates toward the arc-extinguishing fuse 130 and cuts off the arc-extinguishing fuse 130.

[0041] Optionally, such as Figure 3 and Figure 4 As shown, the magnetic thermistor 140 is positioned opposite the first end 181 of the lever 180. The lever 180 is spaced between the arc-extinguishing fuse 130 and the pre-break 120. The magnetic thermistor 140 is located on the side of the lever 180 away from the arc-extinguishing fuse 130. The elastic energy storage element 170 is located on the side of the lever 180 away from the arc-extinguishing fuse 130, and the cutting element 150 is located on the side of the lever 180 away from the elastic energy storage element 170.

[0042] Specifically, such as Figure 3 As shown, the magnetic thermal element 140 is located above the lever 180. When the magnetic thermal element 140 is magnetic, the magnetism provided by the magnetic thermal element 140 attracts the lever 180, causing the elastic energy storage element 170 to be compressed and the lever 180 to be in a balanced position. At this time, the cutting element 150 and the arc extinguishing fuse 130 are arranged opposite each other and have a preset interval.

[0043] like Figure 4 As shown, when the magnetic thermistor 140 is demagnetized by heat, the lever 180 is no longer magnetically attracted, and the elastic energy storage element 170 extends under the gravity of the lever 180. At this time, the first end 181 of the lever 180 is provided with torque by the gravity of the cutting element 150, which causes the first end 181 of the lever 180 to move toward the arc-extinguishing fuse 130, so that the cutting element 150 rotates toward the arc-extinguishing fuse 130 and cuts the arc-extinguishing fuse 130.

[0044] By positioning the levers 180 at intervals between the arc-extinguishing fuse 130 and the pre-break 120, the arc-extinguishing module 100 can be effectively miniaturized, saving space. Of course, besides the layouts listed above, the arc-extinguishing module 100 can also have other layouts; this application does not impose any restrictions on this, as long as it ensures that the cutting element 150 can effectively cut the arc-extinguishing fuse 130 when the magnetic thermistor 140 is demagnetized by heat.

[0045] In another possible implementation of this application, such as Figure 7 and Figure 8 As shown, the magnetic thermistor 140 is spaced between the pre-break 120 and the arc-extinguishing fuse 130, and the cutting element 150 is attracted to the magnetic thermistor 140 by the magnetism of the magnetic thermistor 140. Since the cutting element 150 and the magnetic thermistor 140 are directly attracted, the manufacturing cost is reduced, the assembly efficiency is improved, and the miniaturization of the arc-extinguishing module 100 can be effectively achieved, saving space.

[0046] like Figure 7 As shown, when the magnetic thermistor 140 is magnetic, the cutting element 150 is attracted to the magnetic thermistor 140 by the magnetism of the magnetic thermistor 140. At this time, the cutting element 150 and the arc-extinguishing fuse 130 are arranged opposite each other and have a preset distance. Figure 8 As shown, when the magnetic thermistor 140 is demagnetized by heat, the cutting element 150 moves toward the arc-extinguishing fuse 130 under the action of gravity and cuts off the arc-extinguishing fuse 130.

[0047] In another aspect, this utility model provides a circuit protection device, including the aforementioned arc-extinguishing module 100. The specific structure and beneficial effects of the arc-extinguishing module 100 have been described in detail above and will not be repeated here.

[0048] The aforementioned circuit protection device, through the arc-extinguishing module 100, can accurately sense changes in heat and then extinguish the arc via a heat signal, effectively extinguishing the arc even under low current conditions. The arc-extinguishing module 100 improves arc-extinguishing reliability, thereby enhancing equipment safety.

[0049] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. An arc-extinguishing module, characterized in that, The system includes a signal fuse (110), a pre-break (120), and an arc-extinguishing fuse (130). The signal fuse (110) and the pre-break (120) are connected in series on the main circuit (101), and the arc-extinguishing fuse (130) is connected in parallel with the pre-break (120). The arc-extinguishing module (100) also includes a magnetically connected magnetic thermistor (140) and a cutting element (150), which are thermally coupled to the signal fuse (110). The cutting element (150) is positioned corresponding to the arc-extinguishing fuse (130). After the signal fuse (110) melts, the pre-break (120) is disconnected, and the heat generated by the melting of the signal fuse (110) demagnetizes the magnetic thermistor (140), thereby driving the cutting element (150) to move toward the arc-extinguishing fuse (130) and cut off the arc-extinguishing fuse (130).

2. The arc-extinguishing module according to claim 1, characterized in that, The arc extinguishing module (100) further includes an elastic energy storage element (170) and a rotatably mounted lever (180), the elastic energy storage element (170) and the lever (180) being connected; the first end (181) of the lever (180) being connected to the cutting element (150), and the end of the elastic energy storage element (170) away from the lever (180) being fixedly mounted; the elastic energy storage element (170) being used to provide a torque to the first end (181) of the lever (180) to move toward the arc extinguishing fuse (130); the magnetic thermistor (140) being spaced apart from the lever (180), the magnetism of the magnetic thermistor (140) being able to overcome the torque of the elastic energy storage element (170) to hold the lever (180) in the adsorption position, so that the lever (180) is balanced.

3. The arc-extinguishing module according to claim 2, characterized in that, The arc extinguishing module (100) further includes a limiting block (190) fixedly disposed on the second end (182) of the lever (180), and the second end (182) of the lever (180) is fixedly connected to the limiting block (190); when the magnetic thermal element (140) is demagnetized by heat, the limiting block (190) is used to restrict the rotation of the second end (182) of the lever (180).

4. The quenching module of claim 2, wherein, The magnetic thermistor (140) is positioned opposite the second end (182) of the lever (180). The lever (180) is spaced between the arc-extinguishing fuse (130) and the magnetic thermistor (140). The elastic energy storage element (170) is located at the second end of the lever (180) and on the side of the lever (180) away from the magnetic thermistor (140). The elastic energy storage element (170) and the cutting element (150) are both located on the same side of the lever (180).

5. The arc-extinguishing module according to claim 2, characterized in that, The magnetic thermistor (140) is positioned opposite the second end (182) of the lever (180). The lever (180) is spaced between the arc-extinguishing fuse (130) and the magnetic thermistor (140). The elastic energy storage element (170) is located at the first end of the lever (180) and on the side of the lever (180) closer to the magnetic thermistor (140). The elastic energy storage element (170) and the cutting element (150) are located on opposite sides of the lever (180).

6. The arc-extinguishing module according to claim 2, characterized in that, The magnetic thermistor (140) is positioned opposite to the first end (181) of the lever (180). The lever (180) is spaced between the arc-extinguishing fuse (130) and the pre-break (120). The magnetic thermistor (140) is located on the side of the lever (180) away from the arc-extinguishing fuse (130). The elastic energy storage element (170) is located on the side of the lever (180) away from the arc-extinguishing fuse (130). The cutting element (150) is located on the side of the lever (180) away from the elastic energy storage element (170).

7. The arc-extinguishing module according to claim 2, characterized in that, The magnetic thermistor (140) is spaced between the pre-break (120) and the arc-extinguishing fuse (130), and the cutting element (150) is attracted to the magnetic thermistor (140) by the magnetism of the magnetic thermistor (140).

8. The arc-extinguishing module according to claim 1, characterized in that, The arc extinguishing module (100) further includes a heat-conducting sheet (160) disposed between the signal fuse (110) and the magnetic thermistor (140), and the magnetic thermistor (140) and the signal fuse (110) are thermally coupled through the heat-conducting sheet (160).

9. The arc-extinguishing module according to claim 8, characterized in that, The heat-conducting sheet (160) has a first connecting end (161) and a second connecting end (162) that are bent. The first connecting end (161) is located between the signal fuse (110) and the pre-break (120) and is connected to the main circuit (101). The second connecting end (162) is in contact with the magnetic thermistor (140).

10. A circuit protection device, characterized in that, Includes the arc extinguishing module (100) as described in any one of claims 1-9 above.

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