An electric leakage protector

Abstract

The utility model discloses a leakage protector, including protector body, the front surface of protector body is equipped with pivot, reset button and test button, the peripheral surface fixed connection of pivot has handle, one end of pivot is fixedly connected with one -way rotation mechanism, one -way rotation mechanism includes ratchet wheel, mounting bracket, pawl and telescopic mechanism, and the fixed connection of ratchet wheel and pivot has connecting shaft, one end of telescopic mechanism is fixedly connected with moving plate, and one end of moving plate is equipped with the lever and tension spring, and one end of lever and tension spring all is fixedly connected with pawl, make protector body handle only can be carried out downward rotation and break down between the break -down and the maintenance of handle. The utility model has the function that handle can only be carried out downward one -way rotation, avoids the non -professional personnel recklessly to push handle and power supply to cause the expansion of electrical fault.

Description

Technical Field

[0001] This utility model belongs to the field of leakage current protection device technology, and in particular relates to a leakage current protection device. Background Technology

[0002] A residual current device (RCD), also known as a residual current circuit breaker, is mainly used to protect equipment from leakage faults and to protect people from fatal electric shocks. It has overload and short circuit protection functions and can be used to protect circuits or motors from overload and short circuits. It can also be used for infrequent switching and starting of circuits under normal conditions.

[0003] When a short circuit occurs in an electrical appliance, the residual current device (RCD) detects the leakage and trips. The handle is turned downwards and is in the disconnected state. Since the wiring connected to the electrical appliance may still be faulty, if a non-professional attempts to manually reset the power supply, it can easily lead to electric shock or even aggravate the electrical fault in the appliance. To solve the above problems, an RCD is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a leakage current protection device to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a leakage current protector, comprising a protector body. The front surface of the protector body is provided with a rotating shaft, a reset button, and a test button. A handle is fixedly connected to the circumferential side of the rotating shaft. One end of the rotating shaft is fixedly connected to a one-way rotation mechanism. The one-way rotation mechanism includes a ratchet, a mounting bracket, a pawl, and a telescopic mechanism. A connecting shaft is fixedly connected between the ratchet and the rotating shaft. One end of the telescopic mechanism is fixedly connected to a movable plate. One end of the movable plate is provided with a rotating rod and a tension spring. One end of the rotating rod and the tension spring are both fixedly connected to the pawl, so that when the protector body is in the state of circuit breakage and not under maintenance, the handle can only be rotated downwards by the pawl to disconnect the circuit.

[0007] Preferably, the telescopic mechanism includes a sleeve and a movable rod. The sleeve is fixedly installed on one surface of the inner wall of the mounting frame. A spring is fixedly connected to one surface of the inner wall of the sleeve. A sliding plate is fixedly connected to one end of the spring. A permanent magnet is fixedly installed on one surface of the sliding plate. One end of the movable rod is fixedly connected to the permanent magnet. An electromagnet is fixedly connected to the other surface of the inner wall of the sleeve. When the electromagnet is energized, it repels the permanent magnet. The permanent magnet drives the pawl to retract, which can push the handle upward to close after the test is completed.

[0008] Preferably, the rotating rod is rotatably connected to the moving plate, and the pawl cooperates with the ratchet.

[0009] Preferably, the electromagnet is electrically connected to the test button.

[0010] Preferably, an annular groove is provided at the middle position of the electromagnet, and the diameter of the annular groove is larger than the diameter of the movable rod, so that the movable rod can pass through the electromagnet.

[0011] Preferably, both the movable rod and the sliding plate are in sliding engagement with the sleeve.

[0012] Preferably, the permanent magnet is made of samarium cobalt magnet, and the permanent magnet is magnetically repelled by electromagnets.

[0013] This utility model has the following beneficial effects:

[0014] This invention features a handle that can only rotate downwards, preventing unauthorized personnel from accidentally pushing the handle upwards to supply power and causing further electrical malfunctions. Specifically, it incorporates a ratchet, pawl, and tension spring. When the protector detects a leakage, the pawl extends and aligns with the ratchet, causing the handle to rotate downwards and drive the ratchet to rotate as well. The ratchet and pawl work together to ensure unimpeded downward rotation. When an unauthorized person pushes the handle upwards, the pawl locks the ratchet, preventing it from rotating and thus preventing the handle from rotating upwards. This ensures personal safety and prevents further electrical malfunctions.

[0015] This invention ensures that the handle can only be lifted and closed after the protector body has been tested and found to be safe, further improving the safety of the equipment. Specifically, it is equipped with a permanent magnet, an electromagnet, and a test button. When the test button is pressed, the protector body performs a self-test. After the self-test confirms safety, the electromagnet is energized to generate magnetism. Through the magnetic repulsion between the electromagnet and the permanent magnet, the permanent magnet is pushed to move the slide plate towards the side of the spring. This, in turn, moves the pawl through the movable rod, so that the pawl no longer limits the ratchet, allowing the handle to be rotated upwards and closed normally.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the unidirectional rotation mechanism of this utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the protective mechanism;

[0021] Figure 4 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0022] The components represented by each number in the attached diagram are listed below: 1. Protector body; 2. Handle; 3. Reset button; 4. Test button; 5. Mounting bracket; 6. Connecting shaft; 7. Ratchet; 8. Moving plate; 9. Pawl; 10. Rotating rod; 11. Tension spring; 12. Sleeve; 13. Movable rod; 14. Spring; 15. Permanent magnet; 16. Electromagnet; 17. Rotating shaft; 18. Slide plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Please see Figures 1-4 As shown, this utility model is a leakage current protector, including a protector body 1. The front surface of the protector body 1 is provided with a rotating shaft 17, a reset button 3 and a test button 4. A handle 2 is fixedly connected to the circumferential side of the rotating shaft 17. The protector body 1 monitors the vector sum of the currents of the live wire and the neutral wire in real time through a zero-sequence current transformer. Under normal operation, the currents of the two wires are equal in magnitude and opposite in direction, and the transformer output is zero. When leakage occurs (such as electric shock to a person or damage to the insulation of the line), part of the current flows back to the ground, causing the vector sum to be non-zero. The transformer senses the residual current signal, which is amplified and drives the tripping mechanism to cut off the power supply within tens of milliseconds, thereby achieving personal safety and fire prevention.

[0026] One end of the rotating shaft 17 is fixedly connected to a one-way rotation mechanism; the one-way rotation mechanism includes a ratchet 7, a mounting bracket 5, a pawl 9, and a telescopic mechanism. The pawl 9 cooperates with the ratchet 7. In the normal state, the pawl 9 extends and inserts into the tooth groove of the ratchet 7, and the tooth surface and the pawl end form a self-locking angle. When the ratchet 7 is subjected to a reverse force, the contact point between the pawl 9 and the tooth groove forms a force seal, preventing the ratchet 7 from moving. When the ratchet 7 rotates in the permissible direction (such as during normal tripping operation): the guide slope of the ratchet teeth presses against the pawl 9, overcoming the force of the tension spring 11 and lifting it up. After the pawl 9 jumps over the tooth groove, the tension spring 11 resets it. In preparation for the next locking, after tripping, the pawl 9 forcibly locks the ratchet 7 to prevent it from being repositioned without inspection and repair. The mounting bracket 5 is set as a quarter cylinder, which can provide a certain degree of protection for the ratchet 7. A connecting shaft 6 is fixedly connected between the ratchet 7 and the rotating shaft 17. One end of the telescopic mechanism is fixedly connected to a moving plate 8. One end of the moving plate 8 is provided with a rotating rod 10 and a tension spring 11. The rotating rod 10 is rotatably connected to the moving plate 8. One end of the rotating rod 10 and the tension spring 11 are both fixedly connected to the pawl 9, so that when the circuit is broken and not inspected, the handle 2 of the protector body 1 can only be turned downwards by the pawl 9 to open the circuit.

[0027] The telescopic mechanism includes a sleeve 12 and a movable rod 13. The sleeve 12 is fixedly installed on one surface of the inner wall of the mounting frame 5. A spring 14 is fixedly connected to one surface of the inner wall of the sleeve 12. A sliding plate 18 is fixedly connected to one end of the spring 14. The movable rod 13 and the sliding plate 18 are both in sliding engagement with the sleeve 12. A permanent magnet 15 is fixedly installed on one surface of the sliding plate 18. The permanent magnet 15 is fixedly installed on the sliding plate 18 by bolts. The permanent magnet 15 is made of samarium cobalt magnet. Samarium cobalt magnet has strong resistance to demagnetization, which avoids the magnetism of the permanent magnet 15 being weakened. The permanent magnet 15 and the electromagnet 16 are magnetically repelled. One end of the movable rod 13 is fixedly connected to the permanent magnet 15.

[0028] An electromagnet 16 is fixedly connected to the other surface of the inner wall of the sleeve 12. It should be noted that a relay (not shown in the figure) is provided inside the protector body 1. When the test button 4 of the protector body 1 is pressed, the system first performs a self-test. If the self-test passes, the electromagnet 16 is energized (through the relay). The electromagnet 16 repels the permanent magnet 15 and drives the pawl 9 to release the limit on the ratchet 7. After the action is completed, the power is automatically cut off. The specific implementation method includes: delayed power cut-off. The power is cut off after a fixed time is set by the time delay relay to ensure reliable action and no continuous power consumption, and to avoid the electromagnet 16 being energized for a long time. An annular groove is opened in the middle of the electromagnet 16, and the diameter of the annular groove is larger than the diameter of the movable rod 13, so that the movable rod 13 can pass through the electromagnet 16, thereby driving the pawl 9 to extend and retract. The electromagnet 16 is electrically connected to the test button 4. When the electromagnet 16 is energized, it repels the permanent magnet 15. The permanent magnet 15 drives the pawl 9 to retract, which can push the handle 2 upward to close after the test is completed.

[0029] Working principle:

[0030] When the protector body 1 detects a leakage current, some current flows back to the ground, causing the vector sum to be non-zero. The current transformer senses a residual current signal, which, after amplification, drives the tripping mechanism to rotate the handle 2 downwards, thus tripping the circuit breaker. During this process, the pawl 9, under the action of the spring 14, inserts into the tooth groove of the ratchet 7, but this does not affect the unidirectional rotation of the ratchet 7. The handle 2 can complete the downward rotation. When a non-professional tries to push the handle 2 upwards without a self-test safety check, the pawl 9 forcibly jams the ratchet 7, preventing it from rotating. The ratchet 7, connected to the connecting shaft 6 and the rotating shaft 17, prevents the handle 2 from being pushed upwards. Pressing the test button 4 causes the protector body 1 to perform a self-test. When the self-test is safe, the electromagnet 16 is energized (via a relay). (Electrical device) When the electromagnet 16 is energized, the electromagnet 16 and the permanent magnet 15 repel each other magnetically, causing the permanent magnet 15 to move closer to the spring 14. The permanent magnet 15 drives the slide plate 18 to move, and the slide plate 18 further drives the pawl 9 to move through the movable rod 13, causing the pawl 9 to be pulled out of the tooth groove of the ratchet 7. The pawl 9 no longer limits the ratchet 7. At this time, the handle 2 can be pushed upward normally to perform the closing operation. After the closing is completed, the power is cut off after a fixed time is set by the time delay relay to avoid the electromagnet 16 being continuously energized and weakening the magnetism of the permanent magnet 15. If the self-test fails, the pawl 9 will not release the limit, and the handle 2 will not be able to perform the closing operation. At this time, professional personnel need to inspect the circuit, which effectively ensures the safe use of the equipment.

[0031] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A residual current device (RCD), comprising a device body (1), wherein the front surface of the device body (1) is provided with a rotating shaft (17), a reset button (3) and a test button (4), and a handle (2) is fixedly connected to the peripheral side of the rotating shaft (17), characterized in that: One end of the rotating shaft (17) is fixedly connected to a one-way rotation mechanism; The one-way rotation mechanism includes a ratchet (7), a mounting bracket (5), a pawl (9), and a telescopic mechanism. A connecting shaft (6) is fixedly connected between the ratchet (7) and the rotating shaft (17). A movable plate (8) is fixedly connected to one end of the telescopic mechanism. A rotating rod (10) and a tension spring (11) are provided at one end of the movable plate (8). One end of the rotating rod (10) and the tension spring (11) are both fixedly connected to the pawl (9), so that the handle (2) of the protector body (1) can only be rotated downwards by the pawl (9) to break the circuit when the circuit is broken and not under maintenance.

2. A residual current device (RCD) according to claim 1, characterized in that, The telescopic mechanism includes a sleeve (12) and a movable rod (13). The sleeve (12) is fixedly installed on one surface of the inner wall of the mounting frame (5). A spring (14) is fixedly connected to one surface of the inner wall of the sleeve (12). A sliding plate (18) is fixedly connected to one end of the spring (14). A permanent magnet (15) is fixedly installed on one surface of the sliding plate (18). One end of the movable rod (13) is fixedly connected to the permanent magnet (15). An electromagnet (16) is fixedly connected to the other surface of the inner wall of the sleeve (12). When the electromagnet (16) is energized, it repels the permanent magnet (15). The permanent magnet (15) drives the pawl (9) to retract, which can push the handle (2) upward to close after the test is completed.

3. A residual current device (RCD) according to claim 1, characterized in that, The rotating rod (10) is rotatably connected to the moving plate (8), and the pawl (9) cooperates with the ratchet (7).

4. A residual current device according to claim 2, characterized in that, The electromagnet (16) is electrically connected to the test button (4).

5. A residual current device (RCD) according to claim 2, characterized in that, An annular groove is provided at the middle position of the electromagnet (16), and the diameter of the annular groove is larger than the diameter of the movable rod (13), so that the movable rod (13) can pass through the electromagnet (16).

6. A residual current device according to claim 2, characterized in that, Both the movable rod (13) and the sliding plate (18) are in sliding engagement with the sleeve (12).

7. A residual current device according to claim 2, characterized in that, The permanent magnet (15) is made of samarium cobalt magnet, and the permanent magnet (15) and the electromagnet (16) are magnetically repulsive.

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