Circuit disconnecting device

Abstract

The invention relates to a circuit disconnecting device, which comprises a hollow shell main body, a trigger device and a switch piece, and is characterized in that a control device is arranged on the shell main body; the shell main body part is provided with a metal connecting plate electrically connected with the control device, or the shell main body part is internally provided with a split type metal plate assembly electrically connected with the control device through a switch piece, and the control device is internally provided with a current sensing element and a temperature sensing element; the current sensing element can detect the current of the metal connecting plate or the split metal plate assembly, the temperature sensing element comprises a temperature sensing resistor and can detect the temperature of the metal connecting plate or the split metal plate assembly, the trigger device is arranged, the control device controls the trigger device to act, and the temperature sensing element can detect the temperature of the metal connecting plate or the split metal plate assembly. Therefore, the metal connecting plate can be impacted to break the metal connecting plate, or the switch piece is driven to act, so that the split type metal plate assembly disconnects the circuit connection, and the circuit disconnection is further realized.

Description

Technical Field

[0001] The present application relates to the technical field of fuses, and in particular to a circuit disconnecting device. Background Art

[0002] Traditional fuses are mainly used for circuit overload protection. When a short circuit or overload occurs in the circuit, the fuse will quickly melt and cut off the power supply. As modern electronic equipment has increasingly higher requirements for safety performance, traditional fuses with a single function can no longer meet market demand, and more intelligent safety protection devices need to be developed. For some high-current application scenarios, pyrotechnic fuses are generally used. Their main working principle is to ignite fireworks to push the piston to cut off the circuit.

[0003] Existing pyrotechnic fuses, when in use, ignite through a constant current for a period of time. In the case of short circuits or severe electromagnetic field shocks, they are prone to misoperation, thus causing safety accidents. At the same time, because they lack sensors and control MCUs, they have no communication, processing and decision-making functions, and do not have the ability for multiple fuses to work together or the function of self-excitation and melting.

[0004] Therefore, the existing pyrotechnic fuse only determines whether to blow the circuit by detecting the current. This method still has great limitations and is prone to misoperation. Summary of the Invention

[0005] The present application provides a circuit disconnecting device that can solve the problem that existing pyrotechnic fuses have few detection parameters and are prone to misoperation in harsh working environments.

[0006] The technical solution of the present application is as follows: A circuit disconnecting device comprising: A hollow housing body, wherein a control device is provided on the housing body, and a metal connecting plate electrically connected to the control device is provided on the housing body; A split metal plate assembly electrically connected to the control device via a switch is provided inside the housing body; The control device is internally provided with a current sensing element and a temperature sensing element. The current sensing element can detect the current of the metal connecting plate or the split metal plate assembly. The temperature sensing element includes a temperature sensing resistor, which can detect the temperature of the metal connecting plate or the split metal plate assembly. a trigger device, the trigger device being arranged on the housing body and being electrically connected to the control device, the control device being used to control the action of the trigger device, the trigger device being capable of causing the metal connecting plate to break or; The trigger device can drive the switch element to operate, so that the split metal plate component is disconnected from the control device.

[0007] By adopting the above scheme, a trigger device is set up and the action of the trigger device is controlled by a control device, so that the metal connecting plate can be impacted to break it, or the switch component can be driven to disconnect the circuit of the split metal plate assembly, thereby achieving circuit disconnection. On this basis, current sensing elements and temperature sensing elements are used to detect changes in voltage, current and temperature on the metal connecting plate or the split metal plate assembly in real time. By detecting multiple parameters flowing through the device, in the face of short circuits and severe electromagnetic field impacts, the control device can also process multiple parameter information and decide whether the entire circuit needs to be disconnected.

[0008] In one embodiment of the present application, opposite notches are provided at both ends of the metal connecting plate, and the current sensing element is electrically connected to the metal connecting plate at both sides of the notch to measure the current flowing through the notch; A connecting section is provided inside the metal connecting plate, and the thickness of the connecting section is smaller than that of the metal connecting plate. The current sensing element is electrically connected to the metal connecting plate at both sides of the connecting section for measuring the current flowing through the connecting section.

[0009] By adopting the above solution, when a metal connecting plate is used to electrically connect the entire control device inside the device, and by providing a notch or a connecting section on the metal connecting plate, the increased resistance at the notch or the connecting section is utilized, thereby facilitating the current sensing element to detect the voltage and current at the notch or the connecting section.

[0010] In one embodiment of the present application, the temperature-sensing resistor is disposed on one side of the notch or the connecting section to measure the temperature change of the notch or the connecting section.

[0011] By adopting the above solution, by setting the temperature sensing resistor on one side of the notch or the connecting section, when the current passes through the notch or the connecting section, the temperature sensing resistor can more sensitively detect the temperature changes caused by the current, thereby enabling the device to detect the temperature change parameters.

[0012] In one embodiment of the present application, the trigger device includes an ignition device, a vertically arranged explosion chamber is provided inside the shell body, the ignition device is fixedly assembled in the explosion chamber, the ignition device is a block-shaped plastic component with a hollow interior, ignition powder is provided inside the ignition device, and an ignition fuse is provided at one end of the ignition device. The ignition fuse is electrically connected to the control device and is used to control the combustion of the ignition powder inside the ignition device to cause the metal connecting plate to break.

[0013] By adopting the above scheme, when the control device integrates the current, voltage and temperature parameters and needs to disconnect the circuit, it sends an ignition current to the ignition device. The ignition current enters the ignition powder inside the ignition device through the ignition fuse. The ignition powder burns violently, and the explosive gas generated is guided by the explosion chamber to break the metal connecting plate, thereby disconnecting the circuit of the device.

[0014] In one embodiment of the present application, the split metal plate assembly includes a first metal plate and a second metal plate, and the first metal plate and the second metal plate are respectively arranged on both sides of the interior of the shell body, and the first metal plate and the second metal plate are both electrically connected to the control device. The ends of the first metal plate and the second metal plate close to each other extend into the interior of the shell body and form a strip-shaped gap extending along the width direction of the shell body.

[0015] In another embodiment of the present application, the switch member is vertically arranged, one end of the switch member is detachably connected to the trigger device, and the other end is provided with an insulating strip and a conductive strip arranged along the length direction of the switch member, the conductive strip can connect the circuit between the first metal plate and the second metal plate, and form a contact surface with a resistance value, providing a measurement point for the current sensing element and the temperature sensing element, and the switch member can be moved under the drive of the trigger device so that the insulating strip enters the strip gap By adopting the above solution, when the trigger device is not actuated, the conductive strip is located in the strip-shaped gap, connecting the circuit between the first metal plate and the second metal plate, and forming a certain resistance on the contact surface. When the current sensing element measures the current flowing through the first metal plate and the second metal, since the voltage drop is proportional to the flowing current, the flowing current is quantified by measuring the voltage drop. At the same time, when the current flows through the contact surface with resistance, a certain amount of heat is generated. The heat there is greater than the overall temperature of the first metal plate and the second metal plate. Therefore, by arranging the temperature-sensitive resistor on one side of the contact surface, the temperature of the entire first metal plate and the second metal plate can be detected more quickly and sensitively. As a result, the device can determine whether to perform a fuse based not only on the current parameter, but also on the voltage or temperature parameter, thereby reducing the occurrence of device malfunction. In addition, when the trigger device is activated, the insulating strip replaces the conductive strip and moves into the strip gap, thereby blocking the circuit connection between the first metal strip and the second metal strip. After the circuit is disconnected, the first metal plate and the second metal plate are not damaged. Therefore, after the device is activated, it is only necessary to remove the trigger device and reset the switch component before it can be reused, thereby saving costs and improving economic benefits.

[0016] In one embodiment of the present application, the trigger device is detachably mounted on the housing body, and the trigger device includes: A hard tube, wherein an annular groove is formed on the shell body, the hard tube is vertically arranged on the annular groove and is threadedly connected to the bottom of the annular groove, and exhaust holes are formed on both sides of the hard tube and communicate with the annular groove; an electromagnetic block, the electromagnetic block being mounted above the interior of the rigid tube, and having a power pin at one end thereof, the power pin being electrically connected to a control device so that the electromagnetic block generates electromagnetic force when energized; a magnetic moving disk, the magnetic moving disk being coaxially disposed inside the hard tube and below the electromagnetic block, the bottom end surface of the magnetic moving disk being threadedly connected to one end of the switch element; When the electromagnetic block is not energized, the outer side of the magnetic moving disk can block the end of the exhaust hole away from the annular groove; When the electromagnetic block is energized, it can drive the magnetic moving disk to move until the exhaust hole is connected to the hard tube.

[0017] Through the above technical solution, by providing a detachable hard tube, when the internal electromagnetic block is actuated and the circuit is disconnected, the entire hard tube and the switch component can be removed from the shell body, and at the same time the magnetic movable disk is reset and reconnected to the switch component. After reconnection, the entire hard tube and the switch component are then installed back on the shell body, so that the device can continue to be used, thereby improving economic benefits.

[0018] In one embodiment of the present application, the switch element includes: A threaded rod, wherein the bottom wall of the rigid tube is coaxially provided with a strip-shaped through hole, the strip-shaped through hole is arranged on the outside of the threaded rod and extends along the length direction of the threaded rod, the diameter of the strip-shaped through hole is consistent with the diameter of the threaded rod, one end of the threaded rod passes through the strip-shaped through hole and is threadedly connected to the bottom end surface of the magnetic movable disk, the thread direction of the threaded rod is consistent with that of the rigid tube, the insulating strip and the conductive strip are both strip plates, one side of the insulating strip is connected and fixed to the other end of the threaded rod, and one side of the conductive strip is connected and fixed to the other side of the insulating strip; An elastic ball is sleeved on the threaded rod, and the strip-shaped through hole is provided with a first slot and a second slot for accommodating the elastic ball at intervals along its length direction. The first slot is coaxially provided with a first circular opening for the elastic ball to pass through at one end away from the second slot, and an extrusion channel is provided between the first slot and the second slot, and the diameter of the extrusion channel is larger than the diameter of the strip-shaped through hole.

[0019] By adopting the above solution, when rotating the rigid tube and removing it, since the connecting plate strip at the lower end of the threaded rod抵触 with the first metal plate and the second metal strip, when the rigid tube rotates, relative rotation will also occur between the threaded rod and the magnetic moving disk. Therefore, when removing the rigid tube by rotation, the threaded connection between the threaded rod and the magnetic moving disk will not interfere with the rigid tube. After the electromagnetic block operates, the generated electromagnetic force will exert a repulsive force on the magnetic moving disk, thereby driving the magnetic moving disk to move downward linearly. Under the action of pressure, the elastic ball enters into the second card slot from the first card slot, so that the conductive strip withdraws from the strip-shaped gap, and the insulating strip can抵住 the first metal plate and the second metal plate, causing the circuit connection between the first metal plate and the second metal plate to be disconnected. When the device needs to be recycled later, by manual traction, the elastic ball can be pulled back from the second card slot to the first card slot.

[0020] In one embodiment of the present application, the insulating strip and the conductive strip have the same width. The width d2 of the insulating strip and the conductive strip and the width d1 of the strip-shaped gap satisfy: d1 < d2, and the length h of the extrusion channel satisfies: d2 < h.

[0021] By adopting the above solution, by限定 the width of the insulating strip and the conductive strip, the width of the strip-shaped gap, and the length of the extrusion channel, when the elastic ball moves from the first card slot to the second card slot, that is, after the elastic ball moves a distance of length h, it is ensured that the conductive strip can completely脱离 the contact with the first metal plate and the second metal plate, thereby facilitating the disconnection of the circuit between the first metal plate and the second metal plate by the device.

[0022] In one embodiment of the present application, conductive terminals are respectively arranged on the same side of the first metal plate and the second metal plate. The two conductive terminals are respectively arranged on both sides of the strip-shaped gap, and the current sensing element is electrically connected to the conductive terminals; The temperature sensing element further includes a temperature sensing resistor. A heat conducting layer is provided on the first metal plate or the second metal plate. The heat conducting layer is located on one side of the strip-shaped gap. The temperature sensing resistor is arranged on the heat conducting layer and is electrically connected to the temperature sensing element.

[0023] By adopting the above technical solution, by arranging conductive terminals connected to the current sensing element on both sides of the strip-shaped gap, the current sensing element can measure the current flowing through the contact surface more accurately, improving the sensitivity of the device to current monitoring; In addition, by arranging the temperature sensing resistor on one side of the strip-shaped gap, the temperature sensing resistor is closer to the contact surface. Since the contact surface heats up faster relative to the first metal plate or the second metal plate, the temperature sensing resistor is more sensitive when monitoring the temperature, improving the accuracy of the device's temperature monitoring.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By providing a control device with a power sensor element and a temperature sensor element inside, the device can not only detect the current flowing through the split metal plate assembly or the metal connecting plate, but also detect the temperature signal in the circuit. At the same time, the control device can uniformly process the current and temperature signals flowing through the first metal plate and the second metal plate, as well as the current signal in the circuit, and control whether the trigger device is to operate after judgment, thereby reducing the possibility of malfunction of the device.

[0025] 2. By arranging a first metal plate and a second metal plate, after the two metal plates are electrically connected to the device circuit, a strip-shaped gap is formed to disconnect the circuit. The stacked insulating strips and conductive strips are arranged in the strip-shaped gap. When the trigger device is actuated, it can push the conductive strip out of contact with the first metal plate and the second metal plate, and at the same time push the insulating strip to fill the strip-shaped gap, ensuring that the circuit between the first metal plate and the second metal plate is disconnected. This avoids the disadvantage of conventional fuses that directly cut off a complete metal conductor and cannot be reused. When the circuit needs to be disconnected, the response speed is also faster.

[0026] 3. By providing a notch or connecting section on the metal connecting plate, the current sensing element can detect the current on the metal connecting plate by measuring the voltage on both sides of the notch or connecting section and calculating the current flowing through, thereby being able to simultaneously detect the voltage and current values ​​of the metal connecting plate, making the device more comprehensive in detecting circuit parameters.

[0027] 4. By providing a conductive strip, when the conductive strip connects the first metal plate and the second metal plate, a contact surface with a relatively small resistance can be formed between the conductive strip and the first metal plate and the second metal plate, making it easier for the device to measure the voltage drop, temperature, and current flowing through the contact surface, thereby improving the safety performance of the device.

[0028] 5. By providing an elastic ball, when the trigger device is actuated, combustion generates a large amount of gas. The high-pressure gas can push the threaded rod to move along the strip-shaped through-hole, thereby driving the elastic ball to deform through the extrusion channel until the high-pressure gas can be discharged from the exhaust hole. At this time, the elastic ball moves from the first slot to the second slot, driving the switch member to move and completing the circuit disconnection. Since the deformation of the elastic ball requires a certain amount of pressure, when the device does not need to be actuated, the threaded rod will not malfunction due to the engagement between the threaded rod and the first slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a planar cross-sectional view of a circuit disconnecting device provided in the first embodiment of the present application; Figure 2 This is a front cross-sectional view of a rigid tube of a circuit disconnect device provided in the first embodiment of the present application; Figure 3 yes Figure 2 A magnified schematic diagram of part A; Figure 4 is a plan view of a conductive strip of a circuit breaker device provided in the first embodiment of the present application; Figure 5 This is a planar schematic diagram of a heat-conducting layer of a circuit disconnecting device provided in the first embodiment of the present application; Figure 6 is a plan view of a circuit disconnecting device provided in the second embodiment of the present application; Figure 7 This is a schematic front view of a notch in a metal connecting plate of a circuit disconnecting device provided in a second embodiment of the present application; Figure 8 It is a schematic front view of a metal connecting plate connecting section of a circuit disconnecting device provided in the second embodiment of the present application.

[0030] Explanation of reference numerals: 1. housing body; 11. control device; 111. current sensing element; 112. temperature sensing element; 12. first metal plate; 121. strip gap; 122. conductive terminal; 123. connection hole; 13. second metal plate; 14. annular groove; 15. metal connecting plate; 151. notch; 152. connection section; 16. explosion chamber; 17. piston block; 2. trigger device; 21. hard tube; 211. exhaust hole; 212. strip gap Hole; 2121, first card slot; 2122, second card slot; 2123, first round mouth; 2124, extrusion channel; 22, electromagnetic block; 221, power pin; 23, magnetic moving disk; 24, ignition device; 241, ignition fuse; 3, switch member; 31, insulating strip; 311, contact surface; 32, conductive strip; 33, threaded rod; 34, elastic ball; 4, temperature sensing resistor; 41, thermal conductive layer; 5, power supply module; 6, arc separation plate assembly. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-8 A circuit disconnecting device provided in this application is described in further detail.

[0032] Example 1 See also Figure 6, is a circuit disconnecting device provided in an embodiment of the present application, comprising: a circuit disconnecting device, comprising: a hollow shell body 1, a trigger device 2 and a switch 3, the shell body 1 is provided with a control device 11, the shell body 1 is provided with a metal connecting plate 15 electrically connected to the control device 11, the control device 11 is provided with a current sensing element 111 and a temperature sensing element 112, the current sensing element 111 can detect the current of the metal connecting plate 15, the temperature sensing element 112 includes a temperature sensing resistor 4, which can detect the temperature of the metal connecting plate 15, the trigger device 2 is provided at The housing body 1 is electrically connected to a control device 11. The control device 11 is used to control the action of the trigger device 2, which can cause the metal connecting plate 15 to break. The current sensing element 111 detects the voltage of the metal connecting plate 15 and calculates the current flowing through the metal connecting plate 15 through Ohm's law, thereby measuring the current and voltage values ​​of the metal connecting plate 15. At the same time, the temperature sensing element 112 is used to measure the temperature change of the metal connecting plate. Therefore, when the device is connected to the circuit to be tested, multiple parameters in the circuit can be detected, and the parameters can be processed and decided by the control device 11.

[0033] See also Figure 7 and Figure 8 , opposite notches 151 are provided at both ends of the metal connecting plate 15, and the current sensing element 111 is electrically connected to the metal connecting plate 15 at both sides of the notch 151 for measuring the current flowing through the notch 151; A connecting section 152 is provided inside the metal connecting plate 15 , and the thickness of the connecting section 152 is smaller than the thickness of the metal connecting plate 15 . The current sensing element 111 is electrically connected to the metal connecting plate 15 at both sides of the connecting section 152 for measuring the current flowing through the connecting section 152 .

[0034] By providing two shapes of metal connecting plates 15, when notches 151 are provided, the resistance at the notches 151 increases, and the voltage on both sides of the notches 151 can be measured by the current sensing element 111, and the current flowing through the metal connecting plates 15 can be calculated using Ohm's law. When a connecting section 152 is provided on the metal connecting plate 15 , the current flowing through the metal connecting plate 15 can also be measured by measuring the voltage across the connecting section 152 ; When measuring the current, the voltage drop on both sides of the notch 151 or the connecting section 152 and the proportionality coefficient between the voltage drop and the current value can be measured in advance. The voltage drop is proportional to the current flowing through. When working, the current flowing through the metal connecting plate 15 can be calculated by directly measuring the voltage drop and combining it with the predetermined proportionality coefficient. The temperature-sensing resistor 4 is provided on one side of the notch 151 or the connecting section 152 to measure the temperature change of the notch 151 or the connecting section 152. Similarly, by providing the notch 151 or the connecting section 152, the increased resistance at two locations is utilized, so that the two locations generate heat first, causing temperature changes, thereby enabling the temperature-sensing resistor 4 to more sensitively detect temperature changes of the entire device; The housing body 1 is further provided with a power supply module 5, which is electrically connected to the control device 11. The power supply module 5 is used alone to power the controller, so that the controller can not only receive the current signal and temperature signal detected by the current sensing element 111 and the temperature sensing element 112, but also can make a comprehensive judgment on the entire circuit in conjunction with other signal parameters of the circuit in which the device is located, thereby improving the safety of the device and reducing the possibility of malfunction of the device. The circuit breaker device further includes an arc separation plate assembly 6, which is disposed inside the housing body 1 and is used to eliminate arcs generated inside the housing body 1; The number of the arc separation plate assemblies 6 can also be set to at least two groups, and the at least two groups of the arc separation plate assemblies 6 can be respectively arranged below the trigger device 2 and located on either side of the trigger device 2; Each set of arc splitter plate assemblies 6 may include a plurality of arc extinguishing plates, each arc extinguishing plate having a leading edge and a trailing edge, and a fiber body supporting and separating the plurality of arc extinguishing plates; In this embodiment, a wireless communication module (not shown) may be further provided inside the control device 11. The device may be updated and upgraded online using Over-The-Air (OTA) technology via the wireless communication module, so that the current limit value can be adjusted online. The control device 11 may be an MCU microcontroller, and the wireless communication module is electrically connected to the MCU microcontroller for receiving control signals from an external terminal; The temperature sensing element 112 may be a thermocouple, a resistance temperature detector, or a fiber optic temperature sensor; The current sensing element 111 may be a Hall sensor; Among them, the metal connecting plates 15 are each provided with a connecting hole 123 at one end away from each other. The metal connecting plates 15 are electrically connected to the circuit to be protected of the device through the connecting hole 123. Connectors such as rivets or screws are passed through the connecting hole 123 to fix the device on the device to be protected. At the same time, the metal connecting plate 15 is connected to the circuit to be protected, so that parameters such as current, temperature and voltage of the circuit to be protected can be monitored and detected.

[0035] The trigger device 2 includes an ignition device 24. A vertically arranged explosion chamber 16 is provided inside the shell body 1. The ignition device 24 is fixedly assembled in the explosion chamber 16. The ignition device 24 is a block-shaped plastic component with a hollow interior. Ignition powder is provided inside the ignition device 24. An ignition fuse 241 is provided at one end of the ignition device 24. The ignition fuse 241 is electrically connected to the control device 11 and is used to control the combustion of the ignition powder inside the ignition device 24 so that the metal connecting plate 15 breaks. By setting the ignition powder in a conventional pyrotechnic fuse, the ignition powder is ignited by an ignition current under the control of the control device 11, so that it burns violently to generate expanding gas, and the gas is used to break the metal connecting plate 15, thereby disconnecting the circuit. The action is sensitive and the circuit is disconnected more thoroughly.

[0036] In another solution of this embodiment, the piston block 17 may be a conductive metal component, and metal slide rails (not shown) may be provided on the inner walls of both sides of the explosion chamber 16 below the piston block 17. Slide grooves adapted to the metal slide rails are provided on both sides of the piston block 17. The metal slide rails are connected to an external short-circuit circuit. When the trigger device 2 drives the piston block 17 downward, the piston block 17 may slide onto the metal slide rails to connect the two metal slide rails, thereby completing the short-circuit circuit and protecting the device circuit. The specific configuration of the short-circuit circuit is conventional in the prior art and will not be described in detail here.

[0037] Example 2 The difference between Example 2 and Example 1 is that, in this embodiment, a split metal plate assembly electrically connected to the control device 11 through a switch component 3 is provided inside the shell body 1, and a current sensing element 111 and a temperature sensing element 112 are provided inside the control device 11. The current sensing element 111 can detect the current of the split metal plate assembly, and the temperature sensing element 112 includes a temperature sensing resistor 4, which can detect the temperature of the split metal plate assembly. The trigger device 2 can drive the switch component 3 to operate, so that the split metal plate assembly is disconnected from the control device 11.

[0038] The split metal plate assembly includes a first metal plate 12 and a second metal plate 13, which are respectively arranged on both sides of the interior of the housing body 1. The first metal plate 12 and the second metal plate 13 are both electrically connected to the control device 11. The ends of the first metal plate 12 and the second metal plate 13 that are close to each other extend into the interior of the housing body 1 and form a strip-shaped gap 121 extending along the width direction of the housing body 1, wherein connection holes 123 are respectively provided at the ends of the first metal plate 12 and the second metal plate 13 that are away from each other. The switch member 3 is arranged vertically, and one end of the switch member 3 is detachably connected to the trigger device 2, and the other end is provided with an insulating strip 31 and a conductive strip 32 arranged along the length direction of the switch member 3. The conductive strip 32 can connect the circuit between the first metal plate 12 and the second metal plate 13 and form a contact surface 311 with a resistance value, providing a measurement point for the current sensing element 111 and the temperature sensing element 112. The switch member 3 can be moved under the drive of the trigger device 2, so that the insulating strip 31 enters the strip-shaped gap 121. By providing the movable insulating strip 31 and conductive strip 32, When the device detects that the circuit needs to be forcibly cut off, the control device 11 controls the trigger device 2 to operate, so that the circuit can be cut off without damaging the first metal plate 12 and the second metal plate 13. At the same time, through contact, a contact surface 311 with resistance is formed between the conductive strip 32 and the first metal plate 12 and the second metal plate 13, which makes it easier for the current sensing element 111 and the temperature sensing element 112 to measure the current and temperature flowing through the first metal plate 12 and the second metal plate 13, thereby improving the sensitivity and accuracy of the device's detection circuit and making the device safer to use.

[0039] See also Figure 2 , the trigger device 2 is detachably assembled on the shell body 1, and the trigger device 2 includes: a hard tube 21, an electromagnetic block 22 and a magnetic moving disk 23. The shell body 1 is provided with an annular groove 14, and the hard tube 21 is vertically arranged on the annular groove 14 and is threadedly connected to the bottom of the annular groove 14. Exhaust holes 211 communicating with the annular groove 14 are provided on both sides of the hard tube 21. The electromagnetic block 22 is assembled on the upper part of the hard tube 21. One end of the electromagnetic block 22 is provided with a power pin 221, and the power pin 221 is electrically connected to the control device 11, so that the electromagnetic block 22 is energized to generate electromagnetic force. The magnetic moving disk 23 is coaxially arranged inside the hard tube 21 and is located at the Below the electromagnetic block 22, the bottom end face of the magnetic movable disk 23 is threadedly connected to one end of the switch member 3. When the electromagnetic block 22 is not energized, the outer side of the magnetic movable disk 23 can block the end of the exhaust hole 211 away from the annular groove 14. When the electromagnetic block 22 is energized, the magnetic movable disk 23 can be driven to move until the exhaust hole 211 is connected to the hard tube 21. By providing a magnetic movable disk 23 connected to the threaded rod 33, the magnetic movable disk 23 can automatically push the threaded rod 33 to move when the electromagnetic block 22 is energized due to the repulsive force generated by the electromagnetic force on itself, thereby ensuring that the device can drive the switch member 3 to move, so as to quickly cut off the circuit connection between the first metal plate 12 and the second metal plate 13.

[0040] In this embodiment, the structure of the trigger device 2 can also use the ignition device 24 mentioned in Example 1. By assembling the ignition device 24 above the inside of the hard tube 21 and igniting the ignition powder inside the ignition device 24 through the ignition fuse 241 on the ignition device 24, the explosion airflow can also drive the magnetic movable plate 23 to move.

[0041] See also Figure 1 and Figure 3 The switch member 3 includes: a threaded rod 33 and an elastic ball 34. The bottom wall of the hard tube 21 is coaxially provided with a strip-shaped through hole 212. The strip-shaped through hole is arranged on the outside of the threaded rod 33 and extends along the length direction of the threaded rod 33. The diameter of the strip-shaped through hole 212 is consistent with the diameter of the threaded rod 33. One end of the threaded rod 33 passes through the strip-shaped through hole 212 and is threadedly connected to the bottom end surface of the magnetic movable disk 23. The threaded rod 33 is consistent with the thread direction of the hard tube 21. The insulating strip 31 and the conductive strip 32 are both strip plates. One side of the insulating strip 31 is connected and fixed to the other end of the threaded rod 33, and one side of the conductive strip 32 is connected and fixed to the other side of the insulating strip 31. The elastic ball 34 is sleeved on the threaded rod 33. The strip-shaped through hole 212 is spaced apart along its length direction with first card grooves 2121 for accommodating the elastic ball 34. and a second slot 2122. The first slot 2121 is coaxially provided with a first circular opening 2123 at one end away from the second slot 2122 for the elastic ball 34 to pass through. An extrusion channel 2124 is provided between the first slot 2121 and the second slot 2122. The diameter of the extrusion channel 2124 is larger than the diameter of the bar-shaped through hole 212. By utilizing the ability of the elastic ball 34 to deform under external extrusion, the electromagnetic force generated by the electromagnetic block 22 can push the elastic ball 34 from the first slot 2121 to the second slot 2122, thereby completing the circuit disconnection between the first metal plate 12 and the second metal plate 13. At the same time, the elastic force of the elastic ball 34 itself enables the device to engage with the first slot 2121 and the second slot 2122 in the absence of external force, thereby ensuring that the threaded rod 33 will not cause the insulating strip 31 and the conductive strip 32 to malfunction.

[0042] In this embodiment, the elastic ball 34 may be a sphere made of rubber.

[0043] See also Figure 4, the widths of the insulating strip 31 and the conductive strip 32 are the same. The widths d2 of the insulating strip 31 and the conductive strip 32 and the width d1 of the strip-shaped gap 121 satisfy: d1 < d2. The length h of the extrusion channel 2124 satisfies: d2 < h. By defining the widths of the insulating strip 31 and the conductive strip 32, the width of the strip-shaped gap 121, and the length of the extrusion channel 2124, when the elastic ball 34 moves from the first card slot 2121 to the second card slot 2122, that is, after the elastic ball 34 moves a distance of length h, the conductive strip 32 can just completely break away from the first metal plate 12 and the second metal plate 13. At the same time, after the conductive strip 32 and the insulating strip 31 enter the strip-shaped gap 121, since the widths of the insulating strip 31 and the conductive strip 32 are greater than the width of the strip-shaped gap 121, the device can completely cover the end faces of the first metal plate 12 and the second metal plate 13 whether the first metal plate 12 and the second metal plate 13 are connected or disconnected.

[0044] Please refer to Figure 4 and Figure 5 , conductive terminals 122 are respectively provided on the same side of the first metal plate 12 and the second metal plate 13. The two conductive terminals 122 are respectively arranged on both sides of the strip-shaped gap 121. The current sensing element

[111] is electrically connected to the conductive terminals 122. By arranging the conductive terminals 122 on both sides of the strip-shaped gap 121, the voltage drop on both sides of the contact surface 311 can be detected better, making the measured data more accurate; The temperature sensing element 112 further includes a temperature-sensitive resistor 4. A heat conduction layer 41 is provided on the first metal plate 12 or the second metal plate 13. The heat conduction layer 41 is located on one side of the strip-shaped gap 121. The temperature-sensitive resistor 4 is arranged on the heat conduction layer 41 and is electrically connected to the temperature sensing element 112. By arranging the temperature-sensitive resistor 4 on the side close to the contact surface 311, the change in temperature can be sensed more sensitively, improving the detection sensitivity of the device to the temperature rise at the contact surface 311.

[0045] It should be noted that there seems to be a minor error in the original text where "

[111] " is written in the middle of a sentence in . It might be a typo. I've translated it as is for now. If this is an important identifier that should be something else, you may need to correct it in the original text for a more accurate translation.In summary, when the metal connecting plate 15 is used and connected to the circuit to be protected, when the device is assembled in the circuit to be protected, the current sensing element 111 quantifies the current value passing through the contact surface 311 by detecting the voltage drop across the notch 151 or the connecting section 152 in the metal connecting plate 15. At the same time, when the current passes through the notch 151 or the connecting section 152, the temperature rise caused by the resistance can cause the resistance of the temperature-sensing resistor 4 to change, thereby converting the change in the temperature signal into an electrical signal, so that the device can comprehensively consider multiple parameters in the circuit and determine whether the device needs to cut off the connection between the first metal plate 12 and the second metal plate 13. In addition, when it is necessary to cut off the circuit, the control device 11 sends an ignition current and causes the ignition powder inside the ignition device 24 to burn. The large amount of gas generated by the combustion can break the metal connecting plate 15, thereby completely disconnecting the circuit. When a split metal plate assembly is used and connected to the circuit to be protected, when it is necessary to cut off the connection between the first metal plate 12 and the second metal plate 13, the control device 11 sends a current to the power pin 221, so that the electromagnetic block 22 is energized to generate an electromagnetic force, and the electromagnetic force generates a repulsive force on the magnetic moving disk 23, so that the magnetic moving disk 23 moves in the direction of the threaded rod 33 in the hard tube 21. The threaded rod 33 can drive the insulating strip 31 into the strip-shaped gap 121, thereby cutting off the connection between the first metal plate 12 and the second metal plate 13. When the device is finished working, the hard tube 21 can be opened. Remove and manually pull the threaded rod 33 up until the conductive bar 32 contacts the first metal plate 12 and the metal plate again, reducing cost consumption. Since the resistance of the contact surface 311 is larger than that of the one-piece conductor when in contact, when the conductive bar 32 is set in the strip-shaped gap 121, the resistance value increases, and the voltage drop and temperature rise that can be brought about are also more obvious. The detected current value will be smaller than the set current limit, which can facilitate the current sensing element 111 and the temperature sensing element 112 to measure the voltage drop and temperature change, while improving the safety of the device in detecting and cutting off the circuit.

[0046] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A circuit disconnecting device, characterized in that: include: A shell body (1) having a hollow interior, wherein a control device (11) is arranged on the shell body (1), and a metal connecting plate (15) electrically connected to the control device (11) is arranged inside the shell body (1); A split metal plate component is provided inside the housing body (1) and is electrically connected to the control device (11) via a switch component (3); The control device (11) is provided with a current sensing element (111) and a temperature sensing element (112) therein; the current sensing element (111) can detect the current of the metal connecting plate (15) or the split metal plate assembly; the temperature sensing element (112) includes a temperature sensing resistor (4) and can detect the temperature of the metal connecting plate (15) or the split metal plate assembly; a trigger device (2), the trigger device (2) being arranged on the housing body (1) and being electrically connected to the control device (11), the control device (11) being used to control the action of the trigger device (2), the trigger device (2) being able to drive the piston block (17) to move and cut off the metal connecting plate (15) or; The trigger device (2) can drive the switch component (3) to operate, thereby disconnecting the circuit between the split metal plate component and the control device (11).

2. A circuit disconnecting device according to claim 1, characterized in that: Opposite notches (151) are provided at both ends of the metal connection plate (15), and the current sensing element (111) is electrically connected to the metal connection plate (15) at both sides of the notch (151) for measuring the current flowing through the notch (151); A connecting section (152) is provided inside the metal connecting plate (15), the thickness of the connecting section (152) is smaller than the thickness of the metal connecting plate (15), and the current sensing element (111) is electrically connected to the metal connecting plate (15) at both sides of the connecting section (152) for measuring the current flowing through the connecting section (152).

3. A circuit disconnecting device according to claim 2, characterized in that: The temperature-sensitive resistor (4) is arranged on one side of the notch (151) or the connecting section (152) and is used to measure the temperature change of the notch (151) or the connecting section (152).

4. A circuit disconnecting device according to claim 3, characterized in that: The trigger device (2) comprises an ignition device (24). A vertically arranged explosion chamber (16) is provided inside the shell body (1). The ignition device (24) is fixedly assembled in the explosion chamber (16). The ignition device (24) is a block-shaped plastic component with a hollow interior. Ignition powder is provided inside the ignition device (24). An ignition fuse (241) is provided at one end of the ignition device (24). The ignition fuse (241) is electrically connected to the control device (11) and is used to control the combustion of the ignition powder inside the ignition device (24) so ​​as to cause the metal connecting plate (15) to break.

5. A circuit disconnecting device according to claim 1, characterized in that: The split metal plate assembly comprises a first metal plate (12) and a second metal plate (13), wherein the first metal plate (12) and the second metal plate (13) are respectively arranged on both sides of the interior of the shell body (1), and the first metal plate (12) and the second metal plate (13) are both electrically connected to the control device (11), and the ends of the first metal plate (12) and the second metal plate (13) close to each other extend into the interior of the shell body (1) and form a strip-shaped gap (121) extending along the width direction of the shell body (1).

6. A circuit disconnecting device according to claim 5, characterized in that: The switch component (3) is arranged vertically, one end of the switch component (3) is detachably connected to the trigger device (2), and the other end is provided with an insulating strip (31) and a conductive strip (32) arranged along the length direction of the switch component (3); the conductive strip (32) can connect the circuit between the first metal plate (12) and the second metal plate (13) and form a contact surface (311) with a resistance value, providing a measurement point for the current sensing element (111) and the temperature sensing element (112); the switch component (3) can move under the drive of the trigger device (2), so that the insulating strip (31) enters the strip-shaped gap (121).

7. A circuit disconnecting device according to claim 6, characterized in that: The trigger device (2) is detachably mounted on the housing body (1), and the trigger device (2) comprises: A hard tube (21), wherein an annular groove (14) is formed on the shell body (1), the hard tube (21) is vertically arranged on the annular groove (14) and is threadedly connected to the bottom of the annular groove (14), and exhaust holes (211) communicating with the annular groove (14) are formed on both sides of the hard tube (21); An electromagnetic block (22), the electromagnetic block (22) being mounted above the interior of the hard tube (21), one end of the electromagnetic block (22) being provided with a power-on pin (221), the power-on pin (221) being electrically connected to the control device (11), so that the electromagnetic block (22) generates electromagnetic force when powered; A magnetic moving disk (23), the magnetic moving disk (23) being coaxially arranged inside the hard tube (21) and located below the electromagnetic block (22), the bottom end surface of the magnetic moving disk (23) being threadedly connected to one end of the switch element (3); When the electromagnetic block (22) is not energized, the outer side of the magnetic moving disk (23) can block the end of the exhaust hole (211) away from the annular groove (14); When the electromagnetic block (22) is energized, it can drive the magnetic moving disk (23) to move until the exhaust hole (211) and the hard tube (21) are connected.

8. A circuit disconnecting device according to claim 7, characterized in that: The switch element (3) comprises: A threaded rod (33), a strip-shaped through hole (212) is coaxially opened on the bottom wall of the hard tube (21). The strip-shaped through hole is arranged outside the threaded rod (33) and extends along the length direction of the threaded rod (33). The diameter of the strip-shaped through hole (212) is the same as the diameter of the threaded rod (33). One end of the threaded rod (33) penetrates through the strip-shaped through hole (212) and is threadedly connected to the bottom end face of the magnetic moving disk (23). The threading direction of the threaded rod (33) is the same as that of the hard tube (21). The insulating strip (31) and the conductive strip (32) are both strip-shaped plate members. One side of the insulating strip (31) is fixedly connected to the other end of the threaded rod (33), and one side of the conductive strip (32) is fixedly connected to the other side of the insulating strip (31); An elastic ball (34), the elastic ball (34) is sleeved on the threaded rod (33). The strip-shaped through hole (212) is provided with a first card slot (2121) and a second card slot (2122) that can accommodate the elastic ball (34) at intervals along its own length direction. One end of the first card slot (2121) far from the second card slot (2122) is coaxially provided with a first round opening (2123) through which the elastic ball (34) can pass. An extrusion channel (2124) is arranged between the first card slot (2121) and the second card slot (2122). The diameter of the extrusion channel (2124) is larger than the diameter of the strip-shaped through hole (212).

9. A circuit disconnecting device according to claim 8, characterized in that: The insulating strip (31) and the conductive strip (32) have the same width. The width d2 of the insulating strip (31) and the conductive strip (32) and the width d1 of the strip-shaped gap (121) satisfy: d1 < d2. The length h of the extrusion channel (2124) satisfies: d2 < h.

10. A circuit disconnecting device according to claim 9, characterized in that: Conductive terminals (122) are respectively arranged on the same side of the first metal plate (12) and the second metal plate (13). The two conductive terminals (122) are respectively arranged on both sides of the strip-shaped gap (121). The current sensing element (111) is electrically connected to the conductive terminal (122); The temperature sensing element (112) further includes a temperature-sensitive resistor (4). A heat-conducting layer (41) is provided on the first metal plate (12) or the second metal plate (13). The heat-conducting layer (41) is located on one side of the strip-shaped gap (121). The temperature-sensitive resistor (4) is arranged on the heat-conducting layer (41) and is electrically connected to the temperature sensing element (112).

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