Leakage protector trigger mechanism with self-checking function

Abstract

The utility model discloses a leakage protector trigger mechanism with a self-checking function, and particularly relates to the field of leakage protectors, the leakage protector trigger mechanism comprises a junction box and an induction box clamped at one side of the junction box, the two sides of the junction box are respectively provided with a junction hole, the inner sides of the two junction holes are respectively provided with a bent conducting strip, the conducting strips extend to the inner side of the junction box, and the induction box is connected with the junction box. The other end of the conducting strip is connected with an electrode plate inserted into the induction box, and the two electrode plates are connected with a zero line and a live line respectively. The magnetic field intensity sensor is arranged to monitor the excitation intensity of the coil in real time, hidden faults such as coil aging, short circuit or iron core demagnetization are effectively detected, protection failure caused by reduction of magnetic circuit performance is avoided, the self-checking coil and the main detection coil are coaxially nested, an insulation framework and a magnetic circuit are shared, and the reliability is high. Compared with a traditional independent coil design, the size is greatly reduced, the self-checking function is integrated on the premise that the size is not increased, and the requirements of families, industries and other scenes for compact power distribution equipment are met.

Description

Technical Field

[0001] This utility model relates to the field of leakage current protection devices, and more specifically, to a triggering mechanism for a leakage current protection device with self-testing function. Background Technology

[0002] As a core safety device in low-voltage power distribution systems, the reliability of the triggering mechanism of a residual current device (RCD) directly affects personal safety and the protection effect of electrical equipment. Traditional RCDs mainly rely on electromagnetic trip units to achieve leakage protection. Their working principle is as follows: a current transformer detects the current difference between the neutral and live wires. When the leakage current exceeds a threshold (such as 30mA), the electromagnetic coil is energized to drive the armature to trip, cutting off the circuit.

[0003] However, in actual use, traditional triggering mechanisms only have a "fault triggering" function and cannot actively detect hidden defects in mechanical components (such as armatures and springs). For example, after long-term use, springs may experience a decrease in reset force due to fatigue, and armatures may become stuck due to dust. These problems cannot be detected through routine testing, posing a risk of protection failure. Utility Model Content

[0004] To solve the above technical problems, this utility model provides a leakage current protection device triggering mechanism with self-testing function, including a junction box and an induction box clipped to one side of the junction box. Each side of the junction box has a wiring hole, and a bent conductive sheet is installed on the inner side of each wiring hole. The conductive sheet extends to the inner side of the junction box, and an electrode sheet inserted into the induction box is connected to the other end of the conductive sheet. A neutral wire and a live wire are respectively connected to the two electrode sheets. A current transformer located in the induction box is sleeved on the outside of the neutral wire and the live wire.

[0005] The junction box is also equipped with a triggering mechanism, which has a magnetic field strength sensor at one end and a movable contact mechanism at the other end.

[0006] In a preferred embodiment, a partition is installed inside the induction box, which divides the inside of the induction box into a control chamber and an induction chamber. A control circuit board is installed inside the control chamber, and the current transformer and the triggering mechanism are both connected to the control circuit board via wiring. The current transformer is located inside the induction chamber.

[0007] In a preferred embodiment, the triggering mechanism includes an outer frame fixed to the inner wall of the junction box and a self-test coil located inside the outer frame. An insulating frame is provided inside the self-test coil, and a main detection coil is provided inside the insulating frame. The main detection coil and the self-test coil are coaxially arranged, and a tripping rod penetrating the outer frame is provided inside the main detection coil.

[0008] In a preferred embodiment, the contact mechanism includes a contact rod located on one side of the outer frame, the end of the contact rod being movably hinged to the inner wall of the junction box, and the end of the tripping lever abutting against the surface of the contact rod.

[0009] In a preferred embodiment, a magnetic block is installed at the end of the contact rod away from the movable hinge, and a baffle is provided on the side of the contact rod away from the outer frame. An electromagnet and a contact switch are fixedly installed on the outer wall of the baffle, with the electromagnet located on one side of the magnetic block.

[0010] In a preferred embodiment, the other end of the neutral wire and the live wire extends through the induction box to the outside of the induction box and is equipped with a terminal block.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] 1. By setting up a magnetic field strength sensor to monitor the coil excitation intensity in real time, the hidden faults such as coil aging, short circuit or iron core demagnetization can be effectively detected, avoiding protection failure due to the deterioration of magnetic circuit performance;

[0013] 2. The self-test coil and the main test coil are coaxially nested, sharing the insulation frame and magnetic circuit. The volume is greatly reduced compared to the traditional independent coil design. The self-test function is integrated without increasing the volume, meeting the needs of compact power distribution equipment in home, industrial and other scenarios.

[0014] 3. Compared with the limitations of traditional manual test buttons that only verify continuity, this device automates and digitizes the self-test process, improving its practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 This is another internal view of the present invention.

[0018] Explanation of reference numerals in the attached diagram: 1 Junction box, 2 Induction box, 3 Wiring hole, 4 Conductive plate, 5 Electrode plate, 6 Neutral wire, 7 Live wire, 8 Current transformer, 9 Partition, 10 Control room, 11 Induction room, 12 Control circuit board, 13 Outer frame, 14 Self-test coil, 15 Insulating frame, 16 Main detection coil, 17 Tripping rod, 18 Contact rod, 19 Magnetic block, 20 Baffle, 21 Electromagnet, 22 Wiring terminal, 23 Magnetic field strength sensor. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] like Figure 1-3 The leakage current protection device triggering mechanism shown includes a junction box 1 and an induction box 2 that is clipped onto one side of the junction box 1. Each side of the junction box 1 has a wiring hole 3. A bent conductive sheet 4 is installed on the inner side of each of the two wiring holes 3. The conductive sheet 4 extends into the inner side of the junction box 1. An electrode sheet 5 inserted into the induction box 2 is connected to the other end of the conductive sheet 4. A neutral wire 6 and a live wire 7 are respectively connected to the two electrode sheets 5. A current transformer 8 located inside the induction box 2 is sleeved on the outside of the neutral wire 6 and the live wire 7.

[0021] The junction box 1 is also equipped with a triggering mechanism, which has a magnetic field strength sensor 23 at one end and a movable contact mechanism at the other end.

[0022] Based on the above, the neutral wire 6 and the live wire 7 are connected to the electrode plate 5 through the conductive sheet 4. The current transformer 8 is sleeved outside the two wires to monitor the current difference between the live wire 7 and the neutral wire 6 in real time. When leakage causes current imbalance, the current transformer 8 outputs a signal to the triggering mechanism. The magnetic field strength sensor 23 detects the tripping action status, and the contact mechanism performs power cut-off.

[0023] Furthermore, the snap-fit ​​design between junction box 1 and induction box 2 facilitates installation and maintenance, and the current transformer 8 works in conjunction with the magnetic field sensor to improve the accuracy of leakage current detection.

[0024] The induction box 2 is equipped with a partition 9, which divides the interior of the induction box 2 into a control chamber 10 and an induction chamber 11. The control chamber 10 is equipped with a control circuit board 12. The current transformer 8 and the triggering mechanism are both connected to the control circuit board 12 through lines. The current transformer 8 is located inside the induction chamber 11.

[0025] Based on the above, the partition 9 divides the induction box 2 into a control chamber 10 and an induction chamber 11. The control circuit board 12 is placed independently in the control chamber 10 to avoid electromagnetic interference. The current transformer 8 is placed in the induction chamber 11 to directly monitor the current signals of the neutral wire 6 and the live wire 7 and transmit them to the control circuit board 12 through the line.

[0026] Furthermore, the physical isolation between the control chamber 10 and the sensing chamber 11 ensures the stability of the signal processing of the control circuit board 12, facilitates the individual replacement of the current transformer 8 or the control circuit board 12, and reduces maintenance costs.

[0027] The triggering mechanism includes an outer frame 13 fixed to the inner wall of the junction box 1 and a self-test coil 14 located inside the outer frame 13. An insulating frame 15 is provided inside the self-test coil 14, and a main detection coil 16 is provided inside the insulating frame 15. The main detection coil 16 and the self-test coil 14 are coaxially arranged. A tripping rod 17 penetrating the outer frame 13 is provided inside the main detection coil 16.

[0028] Based on the above, during the self-test process, the control circuit board 12 periodically sends a test current to the self-test coil 14 to simulate a leakage signal. When there is a real leakage, the current transformer 8 drives the main detection coil 16 to generate a magnetic field, which pushes the trip lever 17 to move.

[0029] Furthermore, by simulating leakage current through the self-test coil 14, the function of the triggering mechanism can be verified without manual intervention. The main detection coil 16 and the self-test coil 14 work independently to ensure that the main circuit and the test signal do not interfere with each other.

[0030] Furthermore, the self-test coil 14 and the main test coil 16 are physically isolated by an insulating frame 15 to avoid interference with the main circuit. The test signal line is separately shielded to prevent electromagnetic noise from affecting the control circuit.

[0031] The contact mechanism includes a contact rod 18 located on one side of the outer frame 13. The end of the contact rod 18 is movably hinged to the inner wall of the junction box 1, and the end of the tripping rod 17 abuts against the surface of the contact rod 18.

[0032] Based on the above, after the trip lever 17 is driven by the magnetic field, it presses against the contact lever 18, and the contact lever 18 rotates around the hinge point, thus breaking the circuit.

[0033] A magnet 19 is installed at the end of the contact rod 18 away from the movable hinge. A baffle 20 is provided on the side of the contact rod 18 away from the outer frame 13. An electromagnet 21 and a contact switch 24 are fixedly installed on the outer wall of the baffle 20. The electromagnet 21 is located on one side of the magnet 19.

[0034] Based on the above, after the self-test is completed, the control circuit board 12 powers the electromagnet 21, generating a magnetic field that attracts the magnetic block 19 and pulls the contact rod 18 to reset the closed contact.

[0035] The other ends of the neutral wire 6 and the live wire 7 pass through the induction box 2 and extend to the outside of the induction box 2, and are equipped with wiring terminals 22.

[0036] Furthermore, the control circuit board 12 integrates the following units:

[0037] The timer unit sets the self-test cycle (e.g., once a month) and generates a self-test start signal;

[0038] Signal generator: generates simulated leakage pulses (5-10mA, lasting 50ms);

[0039] Logic processing unit (MCU): Analyzes the displacement data of the trip lever 17 fed back by the magnetic field strength sensor 23 and determines whether the action meets the standard;

[0040] Drive circuit: controls the on / off state of the self-test coil 14 and the electromagnet 21.

[0041] The self-check process is as follows:

[0042] Step 1, start the timer:

[0043] After the timer on the control circuit board 12 reaches the preset period, it sends a command to the signal generator.

[0044] Step 2: Simulate leakage current signal generation:

[0045] The signal generator outputs a low-voltage pulse current (e.g., 5mA), which is injected into the self-test coil 14 through the line;

[0046] Step 3: Self-test coil 14 is activated:

[0047] When the self-test coil 14 is energized, it generates an alternating magnetic field, which is coupled to the main detection coil 16 through electromagnetic induction.

[0048] Step 4: Response of main detection coil 16:

[0049] The main detection coil 16 generates current under the action of the induced magnetic field, which drives the trip lever 17 to move towards the contact mechanism.

[0050] Step 5: Displacement monitoring of trip lever 17:

[0051] The magnetic field strength sensor 23 detects the displacement of the trip lever 17 in real time (e.g., it needs to move ≥2mm) and transmits the data back to the MCU;

[0052] Step 6: Logical judgment:

[0053] Under normal circumstances: the trip lever 17 completes the specified displacement within 0.1 seconds → the MCU determines that the self-test has passed;

[0054] Abnormal situation: Insufficient displacement or timeout of trip lever 17 → MCU determines fault.

[0055] Step 7: Reset electromagnet 21:

[0056] After the self-test is completed, the control circuit board 12 sends a short current to the electromagnet 21, attracting the magnetic block 19 to reset the contact rod 18 and restore the contact to the closed state.

[0057] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A triggering mechanism for a residual current device (RCD) with self-testing function, characterized in that: The device includes a junction box and an induction box that is clipped onto one side of the junction box. Each side of the junction box has a wiring hole, and a bent conductive sheet is installed on the inner side of each wiring hole. The conductive sheet extends into the inner side of the junction box, and an electrode sheet inserted into the induction box is connected to the other end of the conductive sheet. A neutral wire and a live wire are respectively connected to the two electrode sheets. A current transformer located inside the induction box is sleeved on the outside of the neutral wire and the live wire. The junction box is also equipped with a triggering mechanism, which has a magnetic field strength sensor at one end and a movable contact mechanism at the other end.

2. The leakage current protection device triggering mechanism with self-testing function according to claim 1, characterized in that: The induction box is equipped with a partition that divides the inside of the induction box into a control chamber and an induction chamber. The control chamber is equipped with a control circuit board. The current transformer and the triggering mechanism are both connected to the control circuit board via wiring. The current transformer is located inside the induction chamber.

3. The triggering mechanism of a leakage current protector with self-testing function according to claim 2, characterized in that: The triggering mechanism includes an outer frame fixed to the inner wall of the junction box and a self-test coil located inside the outer frame. An insulating frame is provided inside the self-test coil, and a main detection coil is provided inside the insulating frame. The main detection coil and the self-test coil are coaxially arranged, and a tripping rod penetrating the outer frame is provided inside the main detection coil.

4. The triggering mechanism of a leakage current protector with self-testing function according to claim 3, characterized in that: The contact mechanism includes a contact rod located on one side of the outer frame, with the end of the contact rod movably hinged to the inner wall of the junction box, and the end of the tripping lever abutting against the surface of the contact rod.

5. The triggering mechanism of a leakage current protector with self-testing function according to claim 4, characterized in that: A magnetic block is installed at the end of the contact rod away from the movable hinge. A baffle is provided on the side of the contact rod away from the outer frame. An electromagnet and a contact switch are fixedly installed on the outer wall of the baffle. The electromagnet is located on one side of the magnetic block.

6. The triggering mechanism of a leakage current protector with self-testing function according to claim 1, characterized in that: The other ends of the neutral and live wires pass through the induction box and extend to the outside of the induction box, where they are equipped with terminals.

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