A circuit protection mechanism with power cut-off early warning

Abstract

The invention discloses a circuit protection mechanism with power cut-off early warning, comprising a power receiving device, the power receiving device comprising a wiring board, a cover plate, a conductive plate and a spring, which is used for connecting to a power source and preventing virtual connection of a line; a leakage protection device comprising an induction coil, a spring, a mounting plate, a second contact piece, an armature and an electromagnet, which can cut off the circuit for protection when leakage and undervoltage occur in the circuit; a self-locking device comprising an electromagnetic coil, a moving rod, an insulating plate, a limit plate, an indicator plate, a step-down capacitor, a voltage stabilizer, a withstand capacitor and a button switch, which can cut off the circuit when leakage and power failure occur in the circuit, so as to prevent safety hazards caused by power resumption.

Description

Technical Field

[0001] The present invention relates to the field of circuit protection equipment, and in particular to a circuit protection mechanism with power cut-off early warning. Background Art

[0002] During the operation of the equipment, leakage and undervoltage faults may occur, so a circuit protection device is needed to protect the circuit. However, when a power outage occurs, the existing circuit protection device will not be turned off, so that the operating equipment is in a standby state, and the equipment will be started directly when the power is restored next time, which may easily cause excessive instantaneous current to burn the equipment and cause safety accidents. Therefore, a circuit protection mechanism with a power cut-off warning is needed.

[0003] For example, a circuit protection device proposed in CN201511024008.2 includes a partition, a circuit board, an AC power supply channel, a synchronous conversion unit, a synchronous control switch, a tripping and resetting operating mechanism, a ground fault detection drive unit and a test and reset switch, which realizes the synchronous connection or disconnection function of the ground fault protection and the AC power supply channel, and has manual mechanical tripping and manual electrical reset functions to ensure that when a circuit fault occurs in the circuit protection device or a load line fault occurs, the AC power supply to the load line can be manually forced to be cut off; ensure that when the circuit protection device is not energized, or when the circuit protection device fails, or when the AC power supply is reversely connected to the load terminal, the circuit protection device is prevented from being reset, and the circuit protection function of the circuit protection device is tested during the reset process, and when the AC power supply is reversely connected from the load terminal, it can ensure that the socket terminal is not energized, but the above-mentioned problem cannot be solved.

[0004] The present application can automatically cut off the power to the circuit when the power is cut off through the self-locking device, thereby avoiding damage to the circuit when the power is restored and avoiding safety hazards. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to propose a circuit protection mechanism with a power cut-off warning, which can self-lock and cut off the power of the circuit through a self-locking device when a power outage occurs, thereby avoiding damage to the circuit when the power is restored and avoiding safety hazards.

[0006] The present invention provides a circuit protection mechanism with power cut-off early warning, comprising a shell, a first contact piece is arranged at the upper end of the shell, an outlet plate is arranged at the lower end of the shell, and further comprising: a power receiving device arranged at the upper end of the shell, used for connecting to the power supply and preventing virtual connection of the line; a leakage protection device arranged inside the shell, which can cut off the circuit for protection when leakage and undervoltage occur in the circuit; a self-locking device arranged in front of the leakage protection device, which can cut off the circuit when leakage and power failure occur in the circuit, so as to prevent safety hazards after power is restored.

[0007] Furthermore, the power receiving device includes a terminal board, a cover plate, a conductive plate and a spring. The terminal board is slidably installed on the upper end of the shell. A spring is provided between the terminal board and the shell. The conductive plate is fixed on the terminal board. The cover plate is provided on the terminal board and is located above the conductive plate.

[0008] Furthermore, the terminal block and the housing are both provided with connecting columns, and the cover plate is provided with convex patterns.

[0009] Furthermore, the first contact piece is provided with a contact point, and the terminal board is provided with a conductive column.

[0010] Furthermore, the leakage protection device includes an induction coil, a spring piece, a mounting plate, a second contact piece, an armature and an electromagnet. The induction coil is arranged on the lead-in plate, the spring piece is fixed on the induction coil, the mounting plate is fixed to the end of the spring piece, the armature is installed below the mounting plate, the second contact piece is arranged on the mounting plate, the second contact piece is connected to the lead-in plate through a wire, and the electromagnet is arranged in the outer shell and located below the armature.

[0011] Furthermore, the self-locking device includes an electromagnetic coil, a moving rod, an insulating plate, a limit plate, an indicator plate, a step-down capacitor, a voltage stabilizer, a withstand voltage capacitor and a push button switch, the electromagnetic coil is fixed in an outer shell, the moving rod is installed on the electromagnetic coil, one end of the moving rod is connected to the electromagnetic coil through a tension spring, the insulating plate is fixed to one end of the moving rod, the limit plate is rotatably installed at the other end of the moving rod, the indicator plate is slidably installed in the outer shell, both ends of the electromagnetic coil are connected to the first contact piece through a wire, the step-down capacitor, the rectifier, the electromagnetic coil and the push button switch are connected in series in sequence, one end of the electromagnetic coil series button switch is connected to the second contact piece through a wire, and the voltage stabilizer and the withstand voltage capacitor are connected in parallel with the electromagnetic coil.

[0012] Furthermore, the limit plate is connected to the moving rod via a torsion spring, and an "L"-shaped sliding groove corresponding to the limit plate is provided on the outer shell.

[0013] Furthermore, the indicator board is provided with two color cards of different colors, a through hole is opened on the shell, and the lower end of the indicator board is connected to the moving rod.

[0014] Furthermore, the withstand voltage value of the withstand voltage capacitor is more than 1.2 times the voltage stabilization value of the voltage stabilizer.

[0015] Beneficial effects: 1. The terminal block is slidably installed on the upper end of the shell, a spring is provided between the terminal block and the shell, the conductive plate is fixed on the terminal block, and the cover plate is provided on the terminal block, located above the conductive plate. The wires can be wound around the connecting posts on the terminal block, and the wires can be fixed by the cover plate to prevent the wires from falling out. When the terminal block is loose, the spring can be used to pop open the terminal block, thereby completely separating the conductive posts on the wire block from the contacts on the first contact piece, thereby avoiding virtual connection between the conductive posts and the contacts.

[0016] 2. The induction coil is arranged on the access plate, the spring piece is fixed on the induction coil, the mounting plate is fixed to the end of the spring piece, the armature is installed below the mounting plate, the second contact piece is arranged on the mounting plate, the second contact piece is connected to the access plate through a wire, the electromagnet is arranged in the shell, located below the armature, and can check the leakage and undervoltage conditions in the circuit through the induction coil, so that the armature is attracted by the electromagnet to separate the first contact piece from the second contact piece, thereby performing leakage protection on the circuit.

[0017] 3. The electromagnetic coil is fixed in the shell, the moving rod is installed on the electromagnetic coil, one end of the moving rod is connected to the electromagnetic coil through a tension spring, the insulating plate is fixed to one end of the moving rod, the limit plate is rotatably installed on the other end of the moving rod, the indicator plate is slidably installed in the shell, both ends of the electromagnetic coil are connected to the first contact piece through a wire, the step-down capacitor, the rectifier, the electromagnetic coil and the push button switch are connected in series in sequence, one end of the electromagnetic coil series push button switch is connected to the second contact piece through a wire, the voltage stabilizer and the withstand voltage capacitor are connected in parallel with the electromagnetic coil, and the electromagnetic coil can push the moving rod and the insulating plate when the power is off, thereby separating the first contact piece and the second contact piece to disconnect the circuit, ensuring the safety of the circuit when the power is renewed next time, and indicating the circuit status through the color of the indicator plate, so as to give an early warning, and limiting the moving rod through the limit plate to avoid the circuit being renewed after accidentally touching or colliding with the push button switch, thereby forming a double self-locking for the circuit.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0020] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0021] Figure 3 The explosion of the power receiving device of the present invention Figure 1 .

[0022] Figure 4 The explosion of the power receiving device of the present invention Figure 2 .

[0023] Figure 5 It is a schematic diagram of the overall structure of the cover plate of the present invention.

[0024] Figure 6 It is a cross-sectional view of the present invention.

[0025] Figure 7 The overall structure of the leakage protection device of the present invention is shown in FIG. Figure 1 .

[0026] Figure 8 The overall structure of the leakage protection device of the present invention is shown in FIG. Figure 2 .

[0027] Fig. 9 It is an exploded view of the self-locking device of the present invention.

[0028] Fig.10 It is a schematic diagram of the working circuit of the present invention.

[0029] Figure numerals: housing 1; terminal block 2; cover plate 3; conductive plate 4; spring 5; first contact piece 6; lead-out plate 7; induction coil 8; spring piece 9; mounting plate 10; second contact piece 11; armature 12; rectifier 13; electromagnet 14; electromagnetic coil 15; moving rod 16; insulating plate 17; tension spring 18; limit plate 19; torsion spring 20; indicator plate 21; step-down capacitor 22; voltage stabilizer 23; withstand voltage capacitor 24; push button switch 25. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0031] Hereinafter, a circuit protection mechanism with power cut-off warning according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 - Fig. 9 As shown, the circuit protection mechanism with power cut-off warning includes a shell 1, a first contact piece 6 is provided at the upper end of the shell 1, and an outlet plate 7 is provided at the lower end of the shell 1. It also includes: a power receiving device arranged at the upper end of the shell 1, which is used to connect to the power supply and prevent virtual connection of the line; a leakage protection device arranged inside the shell 1, which can cut off the circuit for protection when leakage and undervoltage occur in the circuit; a self-locking device arranged in front of the leakage protection device, which can cut off the circuit when leakage and power outage occur in the circuit, so as to prevent safety hazards after power resumption.

[0032] In a specific embodiment: the load circuit is connected via the lead-out board 7 .

[0033] like Figure 3 , Figure 4 and Figure 5As shown, the circuit protection mechanism with power cut-off warning includes a power receiving device, which includes a terminal block 2, a cover plate 3, a conductive plate 4 and a spring 5. The terminal block 2 is slidably installed on the upper end of the shell 1, and a spring 5 is provided between the terminal block 2 and the shell 1. The conductive plate 4 is fixed on the terminal block 2. The cover plate 3 is provided on the terminal block 2 and is located above the conductive plate 4. The terminal block 2 and the shell 1 are both provided with connecting columns, the first contact piece 6 is provided with a contact point, the terminal block 2 is provided with a conductive column, and the cover plate 3 is provided with a convex pattern.

[0034] In a specific embodiment: the wire is wound around the conductive plate 4 through the connecting column on the terminal block 2, the cover plate 3 is installed on the terminal block 2 through the connecting column on the terminal block 2 and the conductive column on the conductive plate 4, then the terminal block 2 compresses the spring 5 and is fixedly installed on the housing 1 by bolts, so that the conductive column on the conductive plate 4 is conductively connected with the contact point on the first contact piece 6, when the bolt is loosened, the spring 5 is reset by elastic potential energy, thereby pushing the terminal block 2 to move, so that the conductive column on the conductive plate 4 is separated from the contact point on the first contact piece 6, avoiding the virtual connection of the traditional wiring method.

[0035] like Figure 6 , Figure 7 and Figure 8 As shown, the circuit protection mechanism with power cut-off warning includes a leakage protection device, which includes an induction coil 8, a spring 9, a mounting plate 10, a second contact piece 11, an armature 12 and an electromagnet 14. The induction coil 8 is arranged on the access plate 7, the spring 9 is fixed on the induction coil 8, the mounting plate 10 is fixed to the end of the spring 9, the armature 12 is installed below the mounting plate 10, the second contact piece 11 is arranged on the mounting plate 10, the second contact piece 11 is connected to the access plate 7 through a wire, and the electromagnet 14 is arranged in the housing 1, below the armature 12.

[0036] In a specific embodiment: during normal use, the currents flowing through the lead-out board 7 are equal in magnitude and opposite in direction, so that magnetic fields of equal magnitude and opposite in direction are generated on the induction coil 8. The two magnetic fields cancel each other out, so that no electromotive force can be generated on the electromagnet 14, so that the armature 12 does not move, and the second contact piece 11 is normally conductively connected to the first contact piece 6.

[0037] When leakage occurs at the power-using end of the line, part of the current will flow into the earth through the leakage point, and then return to the other end of the power supply through the earth, making the currents flowing through the two side output plates 7 unequal, and the generated magnetic fields are also unequal, and cannot be completely offset, so that current is generated in the induction coil 8, thereby causing the electromagnet 14 to generate magnetic force and attract the armature 12 above, thereby deforming the spring 9 and disconnecting the second contact piece 11 from the first contact piece 6, thereby protecting the circuit.

[0038] like Figure 6 , Fig. 9 and Fig.10 As shown, the circuit protection mechanism with power cut-off warning includes a self-locking device, which includes an electromagnetic coil 15, a moving rod 16, an insulating plate 17, a limit plate 19, an indicator plate 21, a step-down capacitor 22, a voltage stabilizer 23, a withstand voltage capacitor 24 and a button switch 25. The electromagnetic coil 15 is fixed in the housing 1, the moving rod 16 is installed on the electromagnetic coil 15, one end of the moving rod 16 is connected to the electromagnetic coil 15 through a tension spring 18, the insulating plate 17 is fixed to one end of the moving rod 16, the limit plate 19 is rotatably installed at the other end of the moving rod 16, and the limit plate 19 is connected to the moving rod 16 through a torsion spring 20. The housing 1 is provided with an "L"-shaped slide groove corresponding to the limit plate 19, the indicator plate 21 is slidably installed in the housing 1, and two color cards of different colors are provided on the indicator plate 21. A through hole is opened on the housing 1 for observing the indicator plate 21. The lower end of the indicator plate 21 is connected to the moving rod 16, and both ends of the electromagnetic coil 15 are connected to the first contact piece 6 through a wire. The step-down capacitor 22, the rectifier 13, the electromagnetic coil 15 and the button switch 25 are connected in series in sequence, and one end of the electromagnetic coil 15 series button switch 25 is connected to the second contact piece 11 through a wire, and the voltage stabilizer 23 and the withstand voltage capacitor 24 are connected in parallel with the electromagnetic coil 15. Fig.10 As shown, the withstand voltage value of the withstand voltage capacitor 24 is more than 1.2 times the voltage stabilization value of the voltage stabilizer 23.

[0039] In a specific embodiment: when in use, the insulating plate 17 is located between the first contact piece 6 and the second contact piece 11, thereby disconnecting the circuit, and then by pressing the button switch 25, the electromagnetic coil 15 is energized, driving the moving rod 16 to move, and stretching the tension spring 18, so that the insulating plate 17 leaves the first contact piece 6 and the second contact piece 11, so that the circuit is connected. During the movement of the moving rod 16 through the electromagnetic coil 15, the limit plate 19 will limit it. The moving plate needs to be turned to deform the torsion spring 20 so that the limit plate 19 releases the limit on the moving rod 16.

[0040] When the power is off, the electromagnetic coil 15 does not work, so that the moving rod 16 moves between the first contact piece 6 and the second contact piece 11 under the action of the tension spring 18 to reset, thereby ensuring that the circuit will not be connected immediately after the power is stored, ensuring the safety of electricity use.

[0041] Working principle: the wire is wound around the conductive plate 4 through the connecting column on the terminal board 2, and the cover plate 3 is installed on the terminal board 2 through the connecting column on the terminal board 2 and the conductive column on the conductive plate 4, then the terminal board 2 compresses the spring 5 and is fixed to the housing 1 by bolts, so that the conductive column on the conductive plate 4 is conductively connected with the contact on the first contact piece 6. When the bolt is loosened, the spring 5 is reset by elastic potential energy, thereby pushing the terminal board 2 to move, so that the conductive column on the conductive plate 4 is separated from the contact on the first contact piece 6, avoiding the virtual connection of the traditional wiring method. During normal use, the currents flowing through the access plate 7 are equal in magnitude and opposite in direction, so that magnetic fields of equal magnitude and opposite in direction are generated on the induction coil 8, and the two magnetic fields cancel each other, so that no electromotive force can be generated on the electromagnet 14, so that the armature 12 does not move, and the second contact piece 11 is normally conductively connected with the first contact piece 6. When leakage occurs at the power consumption end of the line, part of the current will flow into the earth through the leakage point, and then return to the other end of the power supply through the earth, so that the currents flowing through the access plates 7 on both sides are unequal, and the generated The magnetic fields are also not equal and cannot be completely offset, so that current is generated in the induction coil 8, so that the electromagnet 14 generates magnetic force and attracts the upper armature 12, so that the spring 9 is deformed and the second contact piece 11 is disconnected from the first contact piece 6, so as to protect the circuit. When in use, the insulating plate 17 is located between the first contact piece 6 and the second contact piece 11, so that the circuit is disconnected, and then the button switch 25 is pressed to energize the electromagnetic coil 15, drive the moving rod 16 to move, and stretch the tension spring 18, so that The insulating plate 17 is moved away from between the first contact piece 6 and the second contact piece 11, so that the circuit is connected. During the movement of the moving rod 16 through the electromagnetic coil 15, the limit plate 19 will limit it. The moving plate needs to be turned to deform the torsion spring 20 so that the limit plate 19 releases the limit on the moving rod 16. When the power is off, the electromagnetic coil 15 does not work, so that the moving rod 16 moves to between the first contact piece 6 and the second contact piece 11 under the action of the resetting of the tension spring 18, thereby ensuring that the circuit will not be connected immediately after the power is stored, thereby ensuring the safety of electricity use.

Claims

1. A circuit protection mechanism with power cut-off warning, comprising a housing (1), a first contact piece (6) being provided at the upper end of the housing (1), and an outlet plate (7) being provided at the lower end of the housing (1), characterized in that: Also includes: A power receiving device is provided at the upper end of the housing (1) and is connected to a power source to prevent a false connection of the line; A leakage protection device arranged inside the housing (1) and a self-locking device arranged in front of the leakage protection device, The leakage protection device comprises an induction coil (8), a spring piece (9), a mounting plate (10), a second contact piece (11), an armature (12) and an electromagnet (14); the induction coil (8) is arranged on the access plate (7); the spring piece (9) is fixed on the induction coil (8); the mounting plate (10) is fixed to the end of the spring piece (9); the armature (12) is installed below the mounting plate (10); the second contact piece (11) is arranged on the mounting plate (10); the second contact piece (11) is connected to the access plate (7) via a wire; the electromagnet (14) is arranged in the housing (1) and is located below the armature (12); The indicator plate (21) is slidably mounted in the housing (1), and two color cards of different colors are provided on the indicator plate (21), so that an early warning can be issued by color; The self-locking device comprises an electromagnetic coil (15), a moving rod (16), an insulating plate (17), a limit plate (19), an indicator plate (21), a step-down capacitor (22), a voltage stabilizer (23), a withstand voltage capacitor (24) and a push button switch (25). The electromagnetic coil (15) is fixed in the housing (1), the moving rod (16) is mounted on the electromagnetic coil (15), one end of the moving rod (16) is connected to the electromagnetic coil (15) via a tension spring (18), and the insulating plate (17) is fixed to the moving rod (16). One end of the moving rod (16), a limit plate (19) is rotatably mounted on the other end of the moving rod (16), both ends of the electromagnetic coil (15) are connected to the first contact piece (6) through a wire, a step-down capacitor (22), a rectifier (13), the electromagnetic coil (15) and a button switch (25) are sequentially connected in series, one end of the electromagnetic coil (15) and the series button switch (25) is connected to the second contact piece (11) through a wire, and a voltage stabilizer (23) and a withstand voltage capacitor (24) are connected in parallel with the electromagnetic coil (15); The limit plate (19) is connected to the moving rod (16) via a torsion spring (20), and an "L"-shaped sliding groove corresponding to the limit plate (19) is provided on the housing (1); The housing (1) is provided with a through hole corresponding to the indicator plate (21), and the lower end of the indicator plate (21) is connected to the moving rod (16); The withstand voltage value of the withstand voltage capacitor (24) is more than 1.2 times the voltage stabilization value of the voltage stabilizer (23).

2. The circuit protection mechanism with power cut-off warning as claimed in claim 1, characterized in that: The power receiving device comprises a wiring board (2), a cover plate (3), a conductive plate (4) and a spring (5); the wiring board (2) is slidably mounted on the upper end of the housing (1); a spring (5) is provided between the wiring board (2) and the housing (1); the conductive plate (4) is fixed on the wiring board (2); and the cover plate (3) is provided on the wiring board (2) and is located above the conductive plate (4).

3. The circuit protection mechanism with power cut-off warning as claimed in claim 2, characterized in that: The terminal block (2) and the housing (1) are both provided with connecting columns, and the cover plate (3) is provided with convex patterns.

4. The circuit protection mechanism with power cut-off warning as claimed in claim 2, characterized in that: The first contact piece (6) is provided with a contact point, and the wiring board (2) is provided with a conductive column.

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