Circuit protection device

Abstract

The utility model provides a circuit protection device, and belongs to the technical field of circuit protection. Wherein one end of the limiting unit is movably connected with the triggering unit, the other end of the limiting unit abuts against the first cut-off module, and the triggering unit acts to trigger the limiting unit to release limiting of the first cut-off module when the current value of the electric conductor exceeds a preset current threshold value. The energy storage release module drives the first cut-off module to cut the first pre-fracture; the input end of the switching circuit module is connected with the two ends of the first pre-fracture, the output end of the switching circuit module is connected with the gas generation module, the gas generation module is arranged at the top of the closed cavity, and the second cutting module and the second pre-fracture are arranged in the closed cavity; and the switching circuit module is switched on when the voltage value at the two ends of the first pre-fracture exceeds a preset voltage threshold value, and triggers the gas generation module to output high-pressure gas to the closed cavity so as to drive the second cut-off module to cut off the second pre-fracture. The circuit protection device can achieve the effect of improving the safety and reliability of the circuit protection device.

Description

Technical Field

[0001] This application relates to the field of circuit protection technology, and more specifically, to a circuit protection device. Background Technology

[0002] With the rapid development of new energy technologies, the charging current and voltage of electronic power systems are constantly increasing, requiring fuses to interrupt higher voltages and carry greater currents. As a core component of power protection in electronic power systems, fuses are mainly used to prevent equipment damage or fires caused by overloads or short circuits.

[0003] In related technologies, fuses are generally triggered by a magnetic triggering device, which causes the energy storage element to provide a directional driving force to cut off the weak point of the fuse with a low-magnification action, thereby preventing overload or overcurrent in the main circuit.

[0004] However, when using fuses manufactured based on related technologies for circuit protection, the weak point of the fuse is located in the main circuit, requiring a large impact force to disconnect. If only the energy storage spring in the energy storage element is used to cut the weak point of the fuse, the impact force may be insufficient to completely cut the weak point. Therefore, the related technical solutions suffer from poor fuse safety and reliability. Utility Model Content

[0005] The purpose of this application is to provide a circuit protection device that can improve the safety and reliability of the circuit protection device.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a circuit protection device, which includes: a conductor, an energy storage and release module, a first cut-off module fixedly connected to the bottom of the energy storage and release module, a release restriction module, a gas generation module, a second cut-off module, a switch circuit module, and a sealed chamber. The conductor is provided with a first pre-break and a second pre-break. The release restriction module includes: a trigger unit and a limit unit.

[0008] One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the first cutting module. The triggering unit is used to sense the current value of the conductor and to act when the current value exceeds the preset current threshold to trigger the movement of the limiting unit. The limiting unit releases the limitation on the first cutting module so that the first cutting module moves toward the first pre-break under the drive of the energy storage release module and cuts the first pre-break.

[0009] The first input terminal of the switching circuit module is connected to one end of the first pre-break, the second input terminal of the switching circuit module is connected to the other end of the first pre-break, and the first and second output terminals of the switching circuit module are both connected to the input terminal of the gas generating module. The gas generating module is located at the top of the sealed chamber, and the second cutting-off module and the second pre-break are both located inside the sealed chamber.

[0010] The switching circuit module is used to conduct when the voltage value at both ends of the first pre-break exceeds a preset voltage threshold, and to trigger the gas generating module to output high-pressure gas to the sealed chamber. The second cutting-off module cuts off the second pre-break under the drive of the high-pressure gas.

[0011] As one possible implementation, the triggering unit is a magnetic triggering unit;

[0012] The magnetic trigger unit is surrounded on the conductor where the first pre-break is located. The magnetic trigger unit is movably connected to the limiting unit, and the limiting unit abuts against the first cutting module.

[0013] The magnetic trigger unit and the limiting unit are linked together, and the limiting unit is used to limit the initial position of the first cutting module.

[0014] As one possible implementation, the magnetic triggering unit is a trip unit or an electromagnet, which includes a yoke and an armature.

[0015] As one possible implementation, the magnetic triggering unit includes: a first electromagnet, and the limiting unit includes: a first baffle. The first electromagnet includes: a first magnetic yoke and a first armature.

[0016] The first magnetic yoke is wrapped around the conductor at one end of the first pre-break. One end of the first magnetic yoke is connected to one end of the first armature, and the other end of the first magnetic yoke is connected to the other end of the first armature. One end of the first armature is also movably connected to one end of the first baffle. The other end of the first baffle abuts against the first cutting module.

[0017] When the current value transmitted to the first pre-break exceeds the preset current threshold, the first magnetic yoke attracts the first baffle to move toward the end away from the first pre-break under the action of the current value, so that the first cutting module is released from the limit of the first baffle and moves toward the first pre-break and cuts the first pre-break.

[0018] As one possible implementation, the magnetic triggering unit includes a second electromagnet and a third electromagnet, the limiting unit includes a second baffle and a third baffle, the second electromagnet includes a second yoke and a second armature, and the third electromagnet includes a third yoke and a third armature.

[0019] The second magnetic yoke is wrapped around the conductor at one end of the first pre-break. One end of the second magnetic yoke is connected to one end of the second armature, and the other end of the second magnetic yoke is connected to the other end of the second armature. One end of the second armature is also movably connected to one end of the second baffle. The other end of the second baffle abuts against the first cutting module.

[0020] The third magnetic yoke is wrapped around the conductor at the other end of the first pre-break. One end of the third magnetic yoke is connected to one end of the third armature, and the other end of the third magnetic yoke is connected to the other end of the third armature. One end of the third armature is also movably connected to one end of the third baffle. The other end of the third baffle abuts against the first cutting module.

[0021] When the current value transmitted to the first pre-break exceeds the preset current threshold, the second magnetic yoke attracts the second baffle to move away from the first pre-break under the action of the current value. At the same time, the third magnetic yoke attracts the third baffle to move away from the other end of the first pre-break under the action of the current value. This causes the first cutting module to disengage from the limiting contact of the second and third baffles, and the first cutting module moves toward the first pre-break and cuts the first pre-break.

[0022] As one possible implementation, the energy storage release module includes: a spring, one end of which abuts against the top of the first cutting-off module, and the other end of the spring away from the first cutting-off module is fixedly installed;

[0023] When the energy storage and release module is in the energy storage state, the spring is in the compressed state; when the energy storage and release module is in the energy release state, the spring is in the stretched state.

[0024] As one possible implementation, the first pre-break is located in the weak area of ​​the copper busbar in the conductor.

[0025] As one possible implementation, a melt is connected in parallel across the two ends of the second pre-break, and a resistor is connected in parallel across the two ends of the first pre-break.

[0026] A second aspect of the embodiments of this application provides a circuit protection device, which includes: a conductor, an energy storage and release module, an adsorption module, a release restriction module, a gas generation module, a second cut-off module, a switch circuit module, and a sealed chamber. The conductor is provided with a break and a second pre-break. The release restriction module includes: a trigger unit and a limit unit.

[0027] One end of the adsorption module is fixedly connected to the energy storage and release module, and the other end of the adsorption module is adsorbed on both ends of the break so that the conductor can conduct electricity.

[0028] One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the end of the energy storage and release module away from the adsorption module. The triggering unit is used to sense the current value of the conductor and to act when the current value exceeds a preset current threshold to trigger the movement of the limiting unit. The limiting unit releases the limiting of the energy storage and release module so that the adsorption module moves toward the energy storage and release module and the conductor is disconnected.

[0029] The first input terminal of the switching circuit module is connected to one end of the break, the second input terminal of the switching circuit module is connected to the other end of the break, and the first and second output terminals of the switching circuit module are both connected to the input terminal of the gas generating module. The gas generating module is located at the top of the sealed chamber, and the second cutting module and the second pre-break are both located inside the sealed chamber.

[0030] The switching circuit module is used to conduct when the voltage value at both ends of the break exceeds the preset voltage threshold, and to trigger the gas generating module to output high-pressure gas to the sealed chamber. The second cutting module cuts off the second pre-break under the drive of the high-pressure gas.

[0031] As one possible implementation, the release limiting module also includes: a support unit; the limiting unit includes: a baffle and an energy storage limiting component; and the triggering unit is a magnetic triggering unit.

[0032] The magnetic trigger unit is surrounded on the conductor where the break is located. The magnetic trigger unit is movably connected to one end of the baffle. The other end of the baffle abuts against one end of the energy storage limiting component. The other end of the energy storage limiting component abuts against the end of the energy storage release module away from the adsorption module.

[0033] One end of the support unit rests against the bottom of the adsorption module, and the bottom of the support unit is fixedly installed. The support unit is used to provide support to the adsorption module when the adsorption module moves toward the energy storage and release module.

[0034] The beneficial effects of the embodiments of this application include:

[0035] The circuit protection device provided in this application embodiment consists of a conductor, an energy storage and release module, a first cut-off module, a release restriction module, a gas generation module, a second cut-off module, a switch circuit module, and a sealed chamber. A first pre-break and a second pre-break are pre-set on the conductor. The release restriction module is composed of a trigger unit and a limit unit. One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the first cutting module. When the triggering unit detects that the current value at both ends of the first pre-break exceeds a preset current threshold, the triggering unit starts to move to trigger the limiting unit to move, thereby releasing the limiting unit from its restraint against the first cutting module. Simultaneously, the energy storage and release module releases elastic potential energy. Under the action of the elastic potential energy, the first cutting module moves towards the first pre-break to cut the first pre-break. After the first pre-break is cut, the resistance value of the first pre-break changes. The switching circuit module detects that the voltage value at both ends of the first pre-break exceeds a preset voltage threshold. The switching circuit module is turned on and sends a trigger signal to the gas generating module. Under the action of the trigger signal, the gas generating module generates high-pressure gas. The high-pressure gas breaks through the membrane at the top of the sealed chamber, filling the sealed chamber with high-pressure gas. The second cutting module moves towards the second pre-break under the push of the high-pressure gas, cutting the second pre-break. The circuit protection device can cut the main circuit containing the conductor twice, thus ensuring the cutting effect of the main circuit containing the conductor. In this way, the safety and reliability of circuit protection devices can be improved. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, 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 this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the first type of circuit protection device provided in the embodiments of this application;

[0038] Figure 2 This is a schematic diagram of the structure of the third type of circuit protection device provided in the embodiments of this application;

[0039] Figure 3 A schematic diagram of the working state of the first type of circuit protection device provided in the embodiments of this application;

[0040] Figure 4 This is a schematic diagram of the structure of the fourth circuit protection device provided in the embodiments of this application;

[0041] Figure 5This is a schematic diagram of the working state of the second type of circuit protection device provided in the embodiments of this application;

[0042] Figure 6 This is a schematic diagram of the structure of the fifth type of circuit protection device provided in the embodiments of this application;

[0043] Figure 7 A schematic diagram illustrating the working state of the third type of circuit protection device provided in this application embodiment;

[0044] Figure 8 This is a schematic diagram of the structure of the sixth circuit protection device provided in the embodiments of this application;

[0045] Figure 9 A schematic diagram of the working state of the fourth circuit protection device provided in the embodiments of this application.

[0046] Figure Descriptions: 10: Circuit protection device; 101: Conductor; 1011: First pre-break; 1012: Second pre-break; 1013: Break; 102: Energy storage and release module; 103: First cut-off module; 104: Release restriction module; 1041: Magnetic trigger unit; 411: First electromagnet; 412: Second electromagnet; 413: Third electromagnet; 1042: Limiting unit; 421: First baffle; 422: Second baffle; 423: Third baffle; 1043: Energy storage limiting component; 1044: Support unit; 105: Gas generation module; 106: Second cut-off module; 107: Switching circuit module; 108: Sealed chamber; 109: Melt; 110: Resistor; 111: Adsorption module. Detailed Implementation

[0047] 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, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 product of the invention is in use. They are used only for the convenience of describing this application 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 application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0052] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] Currently, magnetic triggering devices are frequently used to activate energy storage elements, enabling them to provide directional driving force to cut off weak points in the main circuit at a low magnitude, thereby preventing overload or overcurrent in the main circuit. However, this approach requires a significant impact force to cut off the weak points in the main circuit. If only the energy storage spring in the energy storage element is used to cut off the weak points, the impact force may be insufficient to cut off the main circuit. This would fail to prevent overload or overcurrent in the main circuit, thus reducing the safety and reliability of the circuit system.

[0054] To address this, this application provides a circuit protection device that pre-defines two pre-break points in the main circuit containing the conductor. A trigger unit detects the current value transmitted from the conductor to the first pre-break point. When the current value across the first pre-break point reaches a preset current value, the trigger unit activates and triggers a limiting unit to move, releasing the limiting unit's restriction on the first cutting module. Simultaneously, an energy storage and release module releases energy to drive the first cutting module towards the first pre-break point, thus initially cutting the first pre-break point. After the first cutting module cuts the first pre-break point, the resistance value of the first pre-break point changes. When the voltage value across the first pre-break point reaches a preset voltage value, a switching circuit module is activated. Driven by the switching circuit module, a gas generating module generates high-pressure gas. The high-pressure gas fills the sealed chamber and pushes the second cutting module to cut the second pre-break point. This improves the safety and reliability of the circuit protection device.

[0055] The circuit protection device provided in the embodiments of this application will be explained in detail below with reference to the accompanying drawings.

[0056] Figure 1 For a schematic diagram of a circuit protection device provided in this application, see [link to schematic diagram]. Figure 1 This application provides a circuit protection device 10, which includes: a conductor 101, an energy storage and release module 102, a first cut-off module 103 fixedly connected to the bottom of the energy storage and release module 102, a release restriction module 104, a gas generation module 105, a second cut-off module 106, a switch circuit module 107, and a sealed chamber 108. The conductor 101 is provided with a first pre-break 1011 and a second pre-break 1012. The release restriction module 104 includes: a trigger unit and a limit unit.

[0057] Optionally, the conductor 101 is used to characterize the main circuit of the power system for transmitting electrical energy. That is, the circuit where the conductor 101 is located can be regarded as the main circuit of the power system, or the conductor 101 is equal to the main circuit of the power system. The conductor 101 can be implemented by a copper busbar of a certain width and thickness, or it can be implemented by a cable. This application does not make any specific limitations.

[0058] Optionally, the energy storage release module 102 provides elastic potential energy to the first cutting module 103 when the release restriction module 104 is activated, so that the first cutting module 103 can smoothly cut the first pre-break 1011 on the conductor 101, thereby causing a change in the resistance value of the first pre-break 1011, and thus a change in the voltage value across the first pre-break 1011. The energy storage release module 102 can be a tension spring or a compression spring; this application does not specifically limit its application to either.

[0059] Optionally, the first cutting module 103 is used to cut the first pre-break 1011 under the drive of the elastic potential energy of the energy storage and release module 102. The first cutting module 103 can be made of a sharp plastic sheet, a sharp metal head, or other similar object, and this application does not specifically limit its use. It is worth noting that the first cutting module 103 may not be able to completely cut the first pre-break 1011, but the cutting action of the first cutting module 103 on the first pre-break 1011 can cause a change in the resistance of the first pre-break 1011, thereby causing a change in the voltage value across the first pre-break 1011.

[0060] Optionally, both the first pre-break 1011 and the second pre-break 1012 are located in the weakest areas of the conductor 101, meaning the copper busbars of the conductors containing the first pre-break 1011 and the second pre-break 1012 are relatively thinner. This ensures that the first pre-break 1011 and the second pre-break 1012 are easier to cut. The cutting point of the first pre-break 1011 is located before the cutting point of the second pre-break 1012. Thus, after the first pre-break 1011 is cut, the second pre-break 1012 is completely cut off, thereby improving the cutting effect of the circuit protection device 10. This application does not specifically limit the exact location of the first pre-break 1011 and the second pre-break 1012.

[0061] It is worth noting that the triggering unit can be triggered by either magnetic or thermal methods. When the triggering unit is triggered by magnetic means, it surrounds the main circuit containing the conductor 101. When the triggering unit is triggered by thermal means, it is connected to the conductor 101 to obtain the current value transmitted from the conductor 101 to the first pre-break 1011. This embodiment primarily uses magnetic triggering as an example, but this does not imply that the triggering unit can only be triggered by magnetic means; this application does not impose any specific limitations on this.

[0062] One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the first cutting module 103. The triggering unit is used to sense the current value of the conductor 101 and to act when the current value exceeds the preset current threshold to trigger the movement of the limiting unit. The limiting unit releases the limitation on the first cutting module 103 so that the first cutting module 103 moves toward the first pre-break 1011 and cuts the first pre-break 1011 under the drive of the energy storage release module 102.

[0063] Optionally, the trigger unit in the release limit module 104 serves as the current detection element of the release limit module 104. The release limit module 104 detects the current value transmitted from the conductor 101 to both ends of the first pre-break 1011 in real time via the trigger unit, and the trigger unit operates when the current value at both ends of the first pre-break 1011 suddenly increases.

[0064] Optionally, the limiting unit in the release limiting module 104 serves as a limiting support element for the release limiting module 104, and the release limiting module 104 limits the first cutting module 103 to its initial position via the limiting unit. The initial position of the first cutting module 103 is a distance directly above the first pre-break 1011. This ensures that the first cutting module 103 will not cut or contact the first pre-break 1011 before the release limiting module 104 is activated, thus avoiding any change in the resistance of the first pre-break 1011.

[0065] Optionally, the preset current threshold is a current limit set by the user. When the current in the main circuit where the conductor 101 is located reaches the preset current threshold, it is determined that the main circuit where the conductor 101 is located has an overcurrent, overload or other current fault.

[0066] Optionally, when the trigger unit in the release limit module 104 senses that the current value transmitted from the conductor 101 to the first pre-break 1011 exceeds the preset current threshold, there is a circuit fault in the main circuit where the conductor 101 is located. At this time, the trigger unit starts to operate, the first cutting module 103 is released from the limit control of the release limit unit, the spring in the energy storage release module 102 releases elastic potential energy, and the first cutting module 103 moves towards the first pre-break 1011 under the action of the elastic potential energy released by the energy storage release module 102 until it cuts the first pre-break 1011, causing a change in the resistance value of the first pre-break 1011.

[0067] The first input terminal of the switching circuit module 107 is connected to one end of the first pre-break 1011, and the second input terminal of the switching circuit module 107 is connected to the other end of the first pre-break 1011. The first output terminal and the second output terminal of the switching circuit module 107 are both connected to the input terminal of the gas generating module 105. The gas generating module 105 is located at the top of the sealed chamber 108. The second cutting module 106 and the second pre-break 1012 are both located inside the sealed chamber 108.

[0068] Optionally, the switching circuit module 107 samples the voltage value transmitted from the conductor 101 to one end of the first pre-break 1011 via the first input terminal, and samples the voltage value output from the other end of the first pre-break 1011 to the conductor 101 via the second input terminal. When the voltage difference across the first pre-break 1011 reaches a preset voltage value, the switching circuit module 107 is turned on, and sends a trigger signal to the gas generating module 105. The gas generating module 105 generates high-pressure gas under the action of the trigger signal sent by the switching circuit module 107.

[0069] Optionally, the gas generating module 105 can be implemented by a micro gas generator (MGG). The gas generating module 105 is disposed on the top of the sealed chamber 108, and a thin film is disposed on the top of the sealed chamber 108. The output port of the gas generating module 105 is connected to the sealed chamber 108 through the thin film. When the gas generating module 105 generates high-pressure gas under the trigger of the switching circuit module 107, the thin film on the top of the sealed chamber 108 is ruptured, and the high-pressure gas generated by the gas generating module 105 enters the sealed chamber 108.

[0070] Optionally, both the second cutting module 106 and the second pre-break 1012 are located within the sealed chamber 108. The second pre-break 1012 is positioned at the bottom of the sealed chamber 108, and the second cutting module 106 is positioned directly above the second pre-break 1012. A certain distance exists between the second cutting module 106 and the second pre-break 1012. The second cutting module 106 can be secured within the sealed chamber 108 by a fastener. When the sealed chamber 108 is filled with high-pressure gas, the high-pressure gas flowing downwards from the top of the sealed chamber 108 impacts the second cutting module 106, causing it to move towards the second pre-break 1012 and thus cutting off the second pre-break 1012.

[0071] The switching circuit module 107 is used to conduct when the voltage value across the first pre-break 1011 exceeds a preset voltage threshold, and to trigger the gas generating module 105 to output high-pressure gas to the sealed chamber 108. The second cutting-off module 106 cuts off the second pre-break 1012 under the drive of the high-pressure gas.

[0072] Optionally, the preset voltage threshold is a voltage threshold set by the user. When the voltage value at both ends of the first pre-break 1011 exceeds the preset voltage threshold, it is determined that the main circuit where the conductor 101 is located has been cut by the first cutting module 103.

[0073] Optionally, the switching circuit module 107 acquires the voltage value across the first pre-break 1011 via the first input terminal and the second input terminal. When the voltage value across the first pre-break 1011 exceeds a preset voltage threshold, the switching circuit module 107 is turned on and sends a trigger signal to the gas generating module 105. Under the action of the trigger signal, the gas generating module 105 explodes to generate high-pressure gas. The high-pressure gas breaks through the membrane at the top of the sealed chamber 108 and quickly fills the sealed chamber 108, thereby pushing the second cutting module 106 in the sealed chamber 108 to move toward the second pre-break 1012 to cut off the second pre-break 1012.

[0074] It is worth noting that the impact force of the high-pressure gas is extremely large, which can ensure that the second cutting module 106 has a large cutting force on the second pre-break 1012. Under the push of the high-pressure gas, the second cutting module 106 will definitely cut the second pre-break 1012.

[0075] In this embodiment, a circuit protection device is formed by a conductor, an energy storage and release module, a first cut-off module, a release restriction module, a gas generation module, a second cut-off module, a switch circuit module, and a sealed chamber. A first pre-break and a second pre-break are pre-set on the conductor. The release restriction module is composed of a trigger unit and a limit unit. One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the first cutting module. When the triggering unit detects that the current value at both ends of the first pre-break exceeds a preset current threshold, the triggering unit starts to move to trigger the limiting unit to move, thereby releasing the limiting unit from its restraint against the first cutting module. Simultaneously, the energy storage and release module releases elastic potential energy. Under the action of the elastic potential energy, the first cutting module moves towards the first pre-break to cut the first pre-break. After the first pre-break is cut, the resistance value of the first pre-break changes. The switching circuit module detects that the voltage value at both ends of the first pre-break exceeds a preset voltage threshold. The switching circuit module is turned on and sends a trigger signal to the gas generating module. Under the action of the trigger signal, the gas generating module generates high-pressure gas. The high-pressure gas breaks through the membrane at the top of the sealed chamber, filling the sealed chamber with high-pressure gas. The second cutting module moves towards the second pre-break under the push of the high-pressure gas, cutting the second pre-break. The circuit protection device can cut the main circuit containing the conductor twice, thus ensuring the cutting effect of the main circuit containing the conductor. In this way, the safety and reliability of circuit protection devices can be improved.

[0076] In one optional implementation, the triggering unit is a magnetic triggering unit 1041.

[0077] The magnetic triggering unit 1041 surrounds the conductor 101 where the first pre-break 1011 is located. The magnetic triggering unit 1041 is movably connected to one end of the limiting unit 1042, and the other end of the limiting unit 1042 abuts against the first cutting module 103.

[0078] The magnetic trigger unit 1041 and the limiting unit 1042 are linked together, and the limiting unit 1042 is used to limit the initial position of the first cutting module 103.

[0079] Optionally, when the magnetic trigger unit 1041 detects a change in the current value transmitted from the conductor 101 to the first pre-break 1011, the electromagnetic field in the magnetic trigger unit 1041 changes, causing the limiting unit 1042 to move, thereby releasing the position restriction of the limiting unit 1042 on the first cutting module 103.

[0080] Optionally, the initial position of the first cut-off module 103 refers to the position of the first cut-off module 103 when the energy storage release module 102 is not triggered.

[0081] In one optional implementation, the magnetic trigger unit 1041 in the release restriction module 104 provided in this application embodiment is a trip unit or an electromagnet, the electromagnet including: a magnetic yoke and an armature.

[0082] Optionally, when the magnetic trigger unit 1041 is implemented by a trip unit, the magnetic trigger unit 1041 can be regarded as being connected in series in the main circuit where the conductor 101 is located; when the magnetic trigger unit 1041 is implemented by an electromagnet, the magnetic trigger unit 1041 can be regarded as being wrapped around the main circuit where the conductor 101 is located.

[0083] In one alternative implementation, see [link to implementation details]. Figure 2 The magnetic triggering unit 1041 in the release limiting module 104 provided in this application embodiment includes: a first electromagnet 411, and the limiting unit 1042 includes: a first baffle 421. The first electromagnet 411 includes: a first magnetic yoke and a first armature.

[0084] The first magnetic yoke is wrapped around the conductor 101 at one end of the first pre-break 1011. One end of the first magnetic yoke is connected to one end of the first armature, and the other end of the first magnetic yoke is connected to the other end of the first armature. One end of the first armature is also movably connected to one end of the first baffle 421, and the other end of the first baffle 421 abuts against the first cutting module 103.

[0085] When the current value transmitted by the conductor 101 to the first pre-break 1011 exceeds the preset current threshold, the first magnetic yoke attracts the first baffle 421 to move toward the end away from the first pre-break 1011 under the action of the current value, so that the first cutting module 103 is disengaged from the limiting abutment of the first baffle 421, and the first cutting module 103 moves toward the first pre-break 1011 and cuts the first pre-break 1011.

[0086] In one alternative implementation, see [link to implementation details]. Figure 3 The release limiting module 104 in the circuit protection device 10 provided in this application embodiment consists only of a first electromagnet 411 and a first baffle 421. When the first yoke in the first electromagnet 411 senses a sudden increase in the current of the conductor 101 around it, the electromagnetic field in the first yoke changes, attracting the first armature that forms an electromagnetic circuit with it to move to the left. That is, the first yoke attracts the first armature to move away from the first pre-break 1011. As the first armature moves, the first baffle 421 releases the restriction of the first cutting module 103. The energy storage and release module 102 releases elastic potential energy, driving the first cutting module 103 to move toward the first pre-break 1011. The first cutting module 103 begins to cut the first pre-break 1011.

[0087] In one alternative implementation, see [link to implementation details]. Figure 4The magnetic triggering unit 1041 in the release limiting module 104 of the circuit protection device 10 provided in this application embodiment includes: a second electromagnet 412 and a third electromagnet 413; the limiting unit 1042 includes: a second baffle 422 and a third baffle 423; the second electromagnet 412 includes: a second magnetic yoke and a second armature; and the third electromagnet 413 includes: a third magnetic yoke and a third armature.

[0088] The second magnetic yoke is wrapped around the conductor at one end of the first pre-break. One end of the second magnetic yoke is connected to one end of the second armature, and the other end of the second magnetic yoke is connected to the other end of the second armature. One end of the second armature is also movably connected to one end of the second baffle 422, and the other end of the second baffle 422 abuts against the first cutting module 103.

[0089] The third magnetic yoke is wrapped around the conductor at the other end of the first pre-break. One end of the third magnetic yoke is connected to one end of the third armature, and the other end of the third magnetic yoke is connected to the other end of the third armature. One end of the third armature is also movably connected to one end of the third baffle 423, and the other end of the third baffle 423 abuts against the first cutting module 103.

[0090] When the current value transmitted to the first pre-break 1011 by the conductor exceeds the preset current threshold, the second magnetic yoke attracts the second baffle 422 to move away from the first pre-break 1011 under the action of the current value. At the same time, the third magnetic yoke attracts the third baffle 423 to move away from the other end of the first pre-break 1011 under the action of the current value. This causes the first cutting module 103 to disengage from the limiting contact of the second baffle 422 and the third baffle 423. The first cutting module 103 then moves toward the first pre-break 1011 and cuts the first pre-break 1011.

[0091] In one alternative implementation, see [link to implementation details]. Figure 5The release restriction module 104 in the circuit protection device 10 provided in this application embodiment is composed of a second electromagnet 412, a third electromagnet 413, a second baffle 422, and a third baffle 423. When the second yoke in the second electromagnet 412 senses a sudden increase in the current of the conductor 101 it surrounds, the electromagnetic field in the second yoke changes, attracting the second armature that forms an electromagnetic loop with it to move to the left, that is, the second yoke attracts the second armature to move away from the first pre-break 1011. At the same time, the third yoke in the third electromagnet 413 senses a sudden increase in the current of the conductor 101 it surrounds, the electromagnetic field in the third yoke changes, attracting the third armature that forms an electromagnetic loop with it to move to the right, that is, the third yoke attracts the third armature to move away from the first pre-break 1011. As the second armature moves, the second baffle 422 releases its restriction on the first cutting module 103. As the third armature moves, the third baffle 423 releases its restriction on the first cutting module 103. The energy storage and release module 102 releases its elastic potential energy, driving the first cutting module 103 to move toward the first pre-break 1011. The first cutting module 103 then begins to cut the first pre-break 1011.

[0092] In one alternative implementation, see [link to implementation details]. Figure 2 as well as Figure 4 The energy storage release module 102 in the circuit protection device 10 provided in this application embodiment includes: a spring, one end of the spring abutting against the top of the first cutting module 103, and the other end of the spring away from the first cutting module 103 is fixedly installed.

[0093] When the energy storage and release module 102 is in the energy storage state, the spring is in the compressed state; when the energy storage and release module 102 is in the energy release state, the spring is in the stretched state.

[0094] Optionally, when the main circuit where the conductor 101 is located is operating normally, the first pre-break 1011 does not need to be cut, the energy storage release module 102 does not need to release elastic potential energy, the spring is compressed, and the energy storage release module 102 can be regarded as storing elastic potential energy. The state of storing elastic potential energy is regarded as the energy storage state.

[0095] Optionally, when there is a circuit fault in the main circuit where the conductor 101 is located, the first pre-break 1011 needs to be cut, the energy storage release module 102 needs to release elastic potential energy, the spring is stretched, and the energy storage release module 102 can be regarded as the state of releasing elastic potential energy, which is regarded as the energy release state.

[0096] In one alternative implementation, see [link to implementation details]. Figure 1 , Figure 2 as well as Figure 4The first pre-break 1011 in the circuit protection device 10 provided in this application embodiment is located in the weak area of ​​the copper busbar in the conductor 101.

[0097] Optionally, the first pre-break 1011 is located in the weak area of ​​the copper busbar in the conductor 101, which can ensure that the resistance change is caused when the first cutting module 103 cuts the first pre-break 1011. Herein, the weak area of ​​the copper busbar refers to the area on the conductor 101 where the copper busbar is relatively thin.

[0098] In one alternative implementation, see [link to implementation details]. Figure 2 and Figure 4 In the circuit protection device 10 provided in this application embodiment, a fusible element 109 is connected in parallel across the two ends of the second pre-break 1012, and a resistor 110 is connected in parallel across the two ends of the first pre-break 1011.

[0099] Optionally, the fuse 109 is the core component of the fuse. When the second pre-break 1012 is cut off, the fuse 109 melts itself when the current is too large, thereby cutting off the main circuit of the conductor 101 and thus achieving circuit protection.

[0100] Optionally, a resistor 110 is connected in parallel across the two ends of the first pre-break 1011 to shunt the current in the first pre-break 1011, thereby preventing excessive current from damaging the circuit protection device 10.

[0101] In one alternative implementation, see [link to implementation details]. Figure 6 The second type of circuit protection device 10 provided in this application embodiment includes: a conductor 101, an energy storage and release module 102, an adsorption module 111, a release restriction module 104, a gas generation module 105, a second cut-off module 106, a switch circuit module 107, and a sealed chamber 108. The conductor 101 is provided with a break 1013 and a second pre-break 1012. The release restriction module 104 includes: a trigger unit and a limit unit.

[0102] Optionally, the break 1013 is a real notch cut out in the main circuit where the conductor 101 is located. Both ends of the break 1013 are provided with protruding contacts, which are used to contact the adsorption module 111.

[0103] One end of the adsorption module 111 is fixedly connected to the release restriction module 104, and the other end of the adsorption module 111 is adsorbed on both ends of the break 1013 so that the conductor 101 is conductive.

[0104] Optionally, the adsorption module 111 can be implemented by a copper busbar. The adsorption module 111 is provided with protruding contacts. The adsorption module 111 contacts the contacts at both ends of the break 1013 through the contacts, so that the conductor 101 can conduct under normal conditions.

[0105] One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the end of the energy storage and release module 102 away from the adsorption module 111. The triggering unit is used to sense the current value of the conductor 101 and to act when the current value exceeds a preset current threshold to trigger the movement of the limiting unit. The limiting unit releases the limiting of the energy storage and release module 102 so that the adsorption module 111 moves toward the energy storage and release module 102 and the conductor 101 is disconnected.

[0106] The first input terminal of the switching circuit module 107 is connected to one end of the break 1013, the second input terminal of the switching circuit module 107 is connected to the other end of the break 1013, the first output terminal and the second output terminal of the switching circuit module 107 are both connected to the input terminal of the gas generating module 105, the gas generating module 105 is located at the top of the sealed chamber 108, and the second cutting module 106 and the second pre-break 1012 are both located inside the sealed chamber 108;

[0107] The switching circuit module 107 is used to conduct when the voltage value across the break 1013 exceeds a preset voltage threshold, and to trigger the gas generating module 105 to output high-pressure gas to the sealed chamber 108. The second cutting module 106 cuts off the second pre-break 1012 under the drive of the high-pressure gas.

[0108] In one alternative implementation, see [link to implementation details]. Figure 7 The working principle of the second circuit protection device 10 provided in this application embodiment is as follows: When the trigger unit senses that the current value at both ends of the break 1013 exceeds the preset current threshold, the trigger unit acts to drive the limiting unit to move, thereby releasing the limiting unit's limiting control over the adsorption module 111. The energy storage and release module 102 is released from its stretched state, the spring in the energy storage and release module 102 retracts, and the adsorption module 111 is driven by the energy storage and release module 102 to be stretched in the direction of the energy storage and release module 102. The adsorption module 111 is pulled away from the break 1013, and the two ends of the break 1013... The voltage value at the terminal changes; when the switching circuit module 107 senses that the voltage value at both ends of the break 1013 exceeds the preset voltage threshold, the switching circuit module 107 is turned on and sends a trigger signal to the gas generating module 105. Under the action of the trigger signal, the gas generating module 105 explodes and generates high-pressure gas. The high-pressure gas breaks through the membrane at the top of the sealed chamber 108 and quickly fills the sealed chamber 108 to push the second cutting module 106 in the sealed chamber 108 to move towards the second pre-break 1012, thereby cutting off the second pre-break 1012.

[0109] In this embodiment, when the trigger unit detects that the current value at both ends of the break exceeds a preset current threshold, the trigger unit starts to move, driving the limiting unit to release the limiting unit's control over the adsorption module. Simultaneously, the energy storage and release module stores elastic potential energy. Under the contraction of the energy storage and release module, the adsorption module moves towards the energy storage and release module, causing a change in the voltage value at both ends of the break. When the break is disconnected from the adsorption module, the switching circuit module detects that the voltage value at both ends of the break exceeds a preset voltage threshold. The switching circuit module is turned on and sends a trigger signal to the gas generating module. Under the action of the trigger signal, the gas generating module generates high-pressure gas. The high-pressure gas ruptures the membrane at the top of the sealed chamber, filling the sealed chamber with high-pressure gas. The second cutting module moves towards the second pre-break under the push of the high-pressure gas, cutting the second pre-break. The circuit protection device can cut the main circuit containing the conductor twice, ensuring the cutting effect of the main circuit containing the conductor. This improves the safety and reliability of the circuit protection device.

[0110] In one alternative implementation, see [link to implementation details]. Figure 8 The release limiting module 104 in the third type of circuit protection device 10 provided in this application embodiment includes: a support unit 1044, a limiting unit including: a baffle and an energy storage limiting member 1043, and a triggering unit is a magnetic triggering unit 1041.

[0111] The magnetic trigger unit 1041 surrounds the conductor 101 where the break 1013 is located. The magnetic trigger unit 1041 is connected to one end of the baffle, and the other end of the baffle abuts against one end of the energy storage limiting member 1043. The other end of the energy storage limiting member 1043 abuts against the end of the energy storage release module 102 away from the adsorption module 111.

[0112] One end of the support unit 1044 abuts against the bottom of the adsorption module 111. The bottom of the support unit 1044 is fixedly installed. The support unit 1044 is used to provide support force to the adsorption module 111 when the adsorption module 111 moves toward the energy storage and release module 102.

[0113] Optionally, the support unit 1044 can be implemented by a compressed spring. When the adsorption module 111 is driven away from the break 1013 by the energy storage and release module 102 and the release restriction module 104, in order to ensure the separation effect between the break 1013 and the adsorption module 111, the support unit 1044 releases elastic potential energy to provide support for the upward movement of the adsorption module 111.

[0114] In one alternative implementation, see [link to implementation details]. Figure 9The working principle of the third circuit protection device 10 provided in this application embodiment is as follows: When the magnetic trigger unit 1041 senses that the current value at both ends of the break 1013 exceeds the preset current threshold, the electromagnetic field of the magnetic trigger unit 1041 changes, attracting the limiting member to move, so that the baffle releases its limiting support on the energy storage limiting member 1043, the energy storage release module 102 is released from the stretched state, the spring in the energy storage release module 102 retracts, and the adsorption module 111 is pulled towards the energy storage release module 102 by the energy storage release module 102. At the same time, the support unit 1044 is released from the compressed state as the adsorption module 111 moves upward, and the support unit 1044 becomes an adsorption unit. The auxiliary module 111 provides support so that the adsorption module 111 is pulled away from the break 1013, and the voltage value at both ends of the break 1013 changes. When the switching circuit module 107 senses that the voltage value at both ends of the break 1013 exceeds the preset voltage threshold, the switching circuit module 107 is turned on and sends a trigger signal to the gas generating module 105. Under the action of the trigger signal, the gas generating module 105 explodes and generates high-pressure gas. The high-pressure gas breaks through the membrane at the top of the sealed chamber 108 and quickly fills the sealed chamber 108 to push the second cutting module 106 in the sealed chamber 108 to move toward the second pre-break 1012, thereby cutting off the second pre-break 1012.

[0115] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0116] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A circuit protection device, characterized by, The circuit protection device includes: a conductor, an energy storage and release module, a first cut-off module fixedly connected to the bottom of the energy storage and release module, a release restriction module, a gas generation module, a second cut-off module, a switch circuit module, and a sealed chamber. The conductor is provided with a first pre-break and a second pre-break. The release restriction module includes: a trigger unit and a limit unit. One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the first cutting module. The triggering unit is used to sense the current value of the conductor and to act when the current value exceeds a preset current threshold to trigger the movement of the limiting unit. The limiting unit releases the limiting of the first cutting module so that the first cutting module moves toward the first pre-break under the drive of the energy storage release module and cuts the first pre-break. The first input terminal of the switching circuit module is connected to one end of the first pre-break, the second input terminal of the switching circuit module is connected to the other end of the first pre-break, and the first and second output terminals of the switching circuit module are both connected to the input terminal of the gas generating module. The gas generating module is located at the top of the sealed chamber, and the second cutting-off module and the second pre-break are both located inside the sealed chamber. The switching circuit module is used to conduct when the voltage value at both ends of the first pre-break exceeds a preset voltage threshold, and to trigger the gas generating module to output high-pressure gas to the sealed chamber. The second cutting-off module cuts off the second pre-break under the drive of the high-pressure gas.

2. The circuit protection device of claim 1, wherein, The triggering unit is a magnetic triggering unit; The magnetic trigger unit is surrounded on the conductor where the first pre-break is located. The magnetic trigger unit is movably connected to the limiting unit, and the limiting unit abuts against the first cutting module. The magnetic triggering unit and the limiting unit are linked together, and the limiting unit is used to limit the initial position of the first cutting module.

3. The circuit protection device of claim 2, wherein, The magnetic triggering unit is a trip unit or an electromagnet, and the electromagnet includes a yoke and an armature.

4. The circuit protection device of claim 3, wherein, The magnetic triggering unit includes: a first electromagnet; the limiting unit includes: a first baffle; the first electromagnet includes: a first magnetic yoke and a first armature. The first magnetic yoke is wrapped around the conductor at one end of the first pre-break. One end of the first magnetic yoke is connected to one end of the first armature. The other end of the first magnetic yoke is connected to the other end of the first armature. One end of the first armature is also movably connected to one end of the first baffle. The other end of the first baffle abuts against the first cutting module. When the current value transmitted by the conductor to the first pre-break exceeds the preset current threshold, the first magnetic yoke attracts the first baffle to move toward the end away from the first pre-break under the action of the current value, so that the first cutting module is released from the limiting contact of the first baffle, and the first cutting module moves toward the first pre-break and cuts the first pre-break.

5. The circuit protection device of claim 3, wherein, The magnetic triggering unit includes a second electromagnet and a third electromagnet, the limiting unit includes a second baffle and a third baffle, the second electromagnet includes a second magnetic yoke and a second armature, and the third electromagnet includes a third magnetic yoke and a third armature. The second magnetic yoke is wrapped around the conductor at one end of the first pre-break. One end of the second magnetic yoke is connected to one end of the second armature, and the other end of the second magnetic yoke is connected to the other end of the second armature. One end of the second armature is also movably connected to one end of the second baffle. The other end of the second baffle abuts against the first cutting module. The third magnetic yoke is wrapped around the conductor at the other end of the first pre-break. One end of the third magnetic yoke is connected to one end of the third armature, and the other end of the third magnetic yoke is connected to the other end of the third armature. One end of the third armature is also movably connected to one end of the third baffle. The other end of the third baffle abuts against the other end of the top of the first cutting module. When the current value transmitted by the conductor to the first pre-break exceeds a preset current threshold, the second magnetic yoke attracts the second baffle to move toward one end away from the first pre-break under the action of the current value. At the same time, the third magnetic yoke attracts the third baffle to move toward the other end away from the first pre-break under the action of the current value, so that the first cutting module is disengaged from the limiting contact of the second baffle and the third baffle. The first cutting module moves toward the first pre-break and cuts the first pre-break.

6. The circuit protection device of claim 1, wherein, The energy storage and release module includes: a spring, one end of which abuts against the top of the first cutting module, and the end of the spring away from the first cutting module is fixedly installed; When the energy storage and release module is in the energy storage state, the spring is in the compressed state; when the energy storage and release module is in the energy release state, the spring is in the stretched state.

7. The circuit protection device of claim 1, wherein, The first pre-break is located in the weak area of ​​the copper busbar in the conductor.

8. The circuit protection device of claim 1, wherein, The two ends of the second pre-break are connected in parallel with a melt, and the two ends of the first pre-break are connected in parallel with a resistor.

9. A circuit protection device, characterized by The circuit protection device includes: a conductor, an energy storage and release module, an adsorption module, a release restriction module, a gas generation module, a second cut-off module, a switch circuit module, and a sealed chamber. The conductor is provided with a break and a second pre-break. The release restriction module includes: a trigger unit and a limit unit. One end of the adsorption module is fixedly connected to the energy storage and release module, and the other end of the adsorption module is adsorbed onto both ends of the break, so that the conductor is conductive. One end of the limiting unit is movably connected to the triggering unit, and the other end of the limiting unit abuts against the end of the energy storage and release module away from the adsorption module. The triggering unit is used to sense the current value of the conductor and to activate when the current value exceeds a preset current threshold, thereby triggering the limiting unit to move. The limiting unit releases the limiting of the energy storage and release module, so that the adsorption module moves toward the energy storage and release module and the conductor is disconnected. The first input terminal of the switching circuit module is connected to one end of the break, the second input terminal of the switching circuit module is connected to the other end of the break, the first output terminal and the second output terminal of the switching circuit module are both connected to the input terminal of the gas generating module, the gas generating module is located at the top of the sealed chamber, and the second cutting module and the second pre-break are both located inside the sealed chamber. The switching circuit module is used to conduct when the voltage value at both ends of the break exceeds a preset voltage threshold, and to trigger the gas generating module to output high-pressure gas to the sealed chamber. The second cutting-off module cuts off the second pre-break under the drive of the high-pressure gas.

10. The circuit protection device of claim 9, wherein, The release restriction module further includes a support unit, the limiting unit includes a baffle and an energy storage limiting component, and the triggering unit is a magnetic triggering unit; The magnetic triggering unit is surrounded on the conductor where the break is located. The magnetic triggering unit is movably connected to one end of the baffle. The other end of the baffle abuts against one end of the energy storage limiting member. The other end of the energy storage limiting member abuts against the end of the energy storage release module away from the adsorption module. One end of the support unit abuts against the bottom of the adsorption module, and the bottom of the support unit is fixedly installed. The support unit is used to provide support force to the adsorption module when the adsorption module moves toward the energy storage and release module.

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