Plug-in residual current operated protector
By designing a plug-type residual current operated protector, and adopting a beveled hook design and simplified tripping structure, the problem of complex and unreliable leakage protection structure inside the power plug is solved, achieving rapid circuit disconnection and improved safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU BAREP INTELLIGENCE TECH CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-29
AI Technical Summary
The leakage protection structure inside existing power plugs is complex and unreliable, posing a safety hazard.
The plug-type residual current operated protector includes an electrostatic contact, spring, trip module and reset button. Through the beveled hook design and simplified trip structure, it can quickly cut off the circuit.
The simplified tripping module structure improves the reliability and safety of leakage protection, avoids the phenomenon of hooking, and ensures rapid response.
Smart Images
Figure CN224305066U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of residual current device technology, and in particular to a plug-in type residual current operated device. Background Technology
[0002] Household appliances are connected to mains power via a power plug. The power plug is equipped with a leakage current protection structure to provide immediate protection for the safety of electrical equipment and personnel. The leakage current protection structure in the power plug cuts off the power supply within 0.03-0.1 seconds when the residual current exceeds a set threshold (usually ≤30mA).
[0003] The leakage protection structure in existing power plugs has a complex structure and poor reliability, which leads to safety hazards in the power plug. Utility Model Content
[0004] The purpose of this utility model is to provide a plug-type residual current operated protector to solve the problems of complex structure and poor reliability of existing leakage protection tripping devices in power plugs.
[0005] To achieve the above objectives, this utility model adopts the following technical solution: a plug-in type residual current operated protector, comprising:
[0006] The plug housing contains a circuit board with electrostatic contacts. One end of a spring is fixedly installed inside the plug housing, and the free end of the spring has a dynamic contact whose position corresponds to the electrostatic contacts.
[0007] The tripping module includes a yoke, an armature, a lifter, and a hook block. The yoke is disposed inside the tripping coil, and the armature is positioned corresponding to the yoke. One end of the armature is elastically connected to the plug housing via a first spring. The armature passes through the lifter, the hook block, and the tripping coil. The lifter is slidably connected inside the plug housing. An extension arm is provided on the side of the lifter, extending to below the spring. The hook block is rotatably mounted inside the lifter. An annular flange is provided on the armature, contacting the surface of the hook block. A first hook engagement part is provided on the top of the hook block.
[0008] The reset button is elastically connected to the plug housing by a second spring. One end of the second spring contacts the back of the pressing part of the reset button, and the other end contacts the circuit board. The bottom of the reset button is provided with a second hook for hooking with the first hook. The contact surface between the second hook and the first hook is an inclined surface.
[0009] As a further description of the above technical solution:
[0010] The hook block is provided with a groove that matches the shape of the annular flange, and the annular flange is slidably connected in the groove.
[0011] As a further description of the above technical solution:
[0012] The contact surface between the extended arm and the shrapnel is an arc surface.
[0013] As a further description of the above technical solution:
[0014] The lifting device is equipped with a stop block whose position corresponds to the first hook part.
[0015] As a further description of the above technical solution:
[0016] The plug housing has a recessed portion on its surface, and the reset button is located on the bottom surface of the recessed portion.
[0017] As a further description of the above technical solution:
[0018] Anti-slip grooves are provided on one opposite side surface of the plug housing.
[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0020] 1. In this utility model, because the contact surface between the second hook at the bottom of the reset button and the first hook on the hook block is inclined, the reset button and the hook block will not lock together. When a leakage fault occurs, the armature and yoke have no electromagnetic attraction, so the hook block is no longer positioned by the armature and can rotate. Therefore, the reset button moves upward under the action of the second spring force, causing the reset button to disengage from the hook block. This allows the lifting device to move downward under its own weight and the spring force applied to the extension arm by the spring plate. The dynamic contact and static contact at the end of the spring plate separate, quickly cutting off the circuit. Unlike existing technologies, the hook block does not need to have a torsion spring at the pivot to achieve disengagement from the reset button, effectively simplifying the tripping module structure of the plug-type residual current operated protector and improving the reliability of leakage protection.
[0021] 2. In this utility model, the lifting device is equipped with a stop block whose position corresponds to the first hook part. When the hook block rotates to a vertical position, since the width of the first hook part is greater than the width of the second hook part, the portion of the side end of the first hook part that extends beyond the second hook part is blocked by the stop block, thereby limiting the rotation angle of the hook block. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1This is a schematic diagram of a plug-in type residual current operated protector.
[0024] Figure 2 This is a partial cross-sectional view of a plug-in type residual current operated protector.
[0025] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.
[0026] Figure 4 This is a schematic diagram of the tripping module in a plug-in residual current operated protective device. Figure 1 .
[0027] Figure 5 This is a schematic diagram of the tripping module in a plug-in residual current operated protective device. Figure 2 .
[0028] Figure 6 This diagram illustrates the power supply status of the trip module in a plug-in residual current operated protective device. Figure 1 .
[0029] Figure 7 This diagram illustrates the power supply status of the trip module in a plug-in residual current operated protective device. Figure 2 .
[0030] Figure 8 This is a schematic diagram of pressing the reset button on the trip module of a plug-in residual current operated protector.
[0031] Legend:
[0032] 1. Plug housing; 11. Circuit board; 12. Static contact; 13. Spring; 131. Dynamic contact; 14. Recess; 15. Anti-slip groove; 2. Tripping module; 21. Yoke; 211. Tripping coil; 22. Armature; 221. First spring; 222. Annular flange; 23. Lifter; 231. Extending arm; 232. Stop block; 24. Hook block; 241. Slide groove; 3. Reset button; 31. Second spring. Detailed Implementation
[0033] 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.
[0034] Example 1
[0035] Please see Figure 1-8This utility model provides a technical solution: a plug-in type residual current operated protector, comprising:
[0036] The plug housing 1 has a circuit board 11 inside, an electrostatic contact 12 on the circuit board 11, and a spring 13 with one end fixedly installed inside the plug housing 1. The free end of the spring 13 has a moving contact 131 whose position corresponds to the electrostatic contact 12.
[0037] The tripping module 2 includes a yoke 21, an armature 22, a lifter 23, and a hook block 24. The yoke 21 is disposed inside the tripping coil 211, and the armature 22 is positioned corresponding to the yoke 21. One end of the armature 22 is elastically connected to the plug housing 1 via a first spring 221. The armature 22 passes through the lifter 23, the hook block 24, and the tripping coil 211. The lifter 23 is slidably connected inside the plug housing 1. An extension arm 231 is provided on the side of the lifter 23, extending to below the spring piece 13. The hook block 24 is rotatably mounted inside the lifter 23. An annular flange 222 is provided on the armature 22, which contacts the surface of the hook block 24. A first hook engagement part is provided on the top of the hook block 24.
[0038] The reset button 3 is elastically connected to the plug housing 1 by a second spring 31. One end of the second spring 31 contacts the back of the pressing part of the reset button 3, and the other end contacts the circuit board 11. The bottom of the reset button 3 is provided with a second hook for hooking with the first hook. The contact surface between the second hook and the first hook is an inclined surface.
[0039] See appendix Figure 2-4 Because the contact surface between the second hook at the bottom of the reset button 3 and the first hook on the hook block 24 is inclined, the reset button 3 and the hook block 24 will not lock together. When a leakage fault occurs, the armature 22 and the yoke 21 have no electromagnetic attraction, so the hook block 24 is no longer positioned by the armature 22 and can rotate. Therefore, the reset button 3 moves upward under the force of the second spring 31, causing the reset button 3 to disengage from the hook block 24. This allows the lifter 23 to move downward under its own weight and the force of the spring 13 on the extension arm 231. The dynamic contact 131 at the end of the spring 13 separates from the static contact 12, quickly cutting off the circuit. The hook block 24 does not need to have a torsion spring at the pivot to disengage from the reset button 3 as in the prior art, effectively simplifying the structure of the tripping module 2 of the plug-type residual current operated protector and improving the reliability of leakage protection.
[0040] The contact surface between the extendable arm 231 and the spring 13 is an arc surface, which effectively avoids damage to the spring 13 when the extendable arm 231 squeezes the spring 13, thus protecting the spring 13.
[0041] The plug housing 1 has a recessed portion 14 on its surface, and a reset button 3 is disposed on the bottom surface of the recessed portion 14. The top of the reset button 3 extends through the bottom surface of the recessed portion 14, thereby reducing the height of the reset button 3 protruding from the surface of the plug housing 1 and protecting the reset button 3.
[0042] The plug housing 1 has anti-slip grooves 15 on one opposite side surface. The anti-slip grooves 15 include three concentric arc-shaped grooves, the depth of which gradually decreases from bottom to top, making it easier to pull out the plug and improving safety during use.
[0043] Working principle: The output terminal of the leakage current protector is connected to the appliance. The reset button 3 is in an inactive state as follows: Figure 5 .
[0044] See appendix Figure 8 When the RESET button (i.e. reset button 3) is pressed, the reset button 3 falls against the spring force. The inclined surface of the lower side of the second hook part at the bottom of the reset button 3 presses against the inclined surface of the upper end of the first hook part at the top of the hook block 24, causing the hook block 24 to rotate backward. The bottom of the hook block 24 drives the armature 22 to separate from the contact surface of the yoke 21, and the first spring 221 is compressed.
[0045] The reset button 3 continues to descend until the pressing part of the reset button 3 is blocked by the PCB (i.e., circuit board 11). After that, the second hook part of the reset button 3 no longer presses the first hook part. The hook block 24 rotates and resets under the elastic force of the first spring 221. The reset button 3 hooks with the hook block 24, and the armature 22 moves toward the yoke 21 at the same time, and the armature 22 contacts the yoke 21.
[0046] Then release the reset button 3, see appendix. Figure 6-7 When the reset button 3 pulls the hook block 24 upward, the relative position of the hook block 24 and the armature 22 changes. The elevator 23 moves upward along with the hook block 24. The elevator 23, through the extension arm 231, presses the free end of the spring piece 13 upward, bending it. The dynamic contact 131 at the end of the spring piece 13 contacts the static contact 12 on the PCB, thus achieving power supply. Note: Appendix Figure 7 The state of the compressed and deformed spring 13 is not correctly shown in the image. The spring 13 should actually be located above the extended arm 231.
[0047] Under normal conditions, the moving contact 131 contacts the static contact 12 on the PCB, restricting the upward movement of the elevator 23. Furthermore, the hook block 24 is blocked by the armature 22 and cannot rotate. Therefore, the reset button 3 does not rise to its limit position, and the second spring 31 is in a compressed state. (Appendix) Figure 6 The position of reset button 3 in its normal state is not displayed correctly; reset button 3 has not actually reached its upper limit position.
[0048] Example 2
[0049] Based on the above embodiments, this embodiment further improves upon the following technical solution: the hook block 24 is provided with a groove 241 that matches the shape of the annular flange 222, and the annular flange 222 is slidably connected in the groove 241.
[0050] The slide 241 ensures that the annular flange 222 will not detach from the hook block 24 when the hook block 24 moves up and down with the lifter 23, thereby improving the movement stability of the hook block 24.
[0051] Example 3
[0052] Based on the above embodiments, this embodiment further improves upon the following technical solution: the lifting device 23 is provided with a stop block 232 whose position corresponds to the first hook part.
[0053] When the hook block 24 rotates to a vertical position, since the width of the first hook part is greater than the width of the second hook part, the portion of the side end of the first hook part that extends beyond the second hook part is blocked by the stop block 232, thereby limiting the rotation angle of the hook block 24.
[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A plug-in type residual current operated protective device, characterized in that, include: The plug housing has a circuit board inside, on which an electrostatic contact is provided. One end of a spring is fixedly installed inside the plug housing, and the free end of the spring is provided with a dynamic contact whose position corresponds to the electrostatic contact. A tripping module includes a yoke, an armature, a lifter, and a hook block. The yoke is disposed inside the tripping coil, and the armature is positioned corresponding to the yoke. One end of the armature is elastically connected to the plug housing via a first spring. The armature passes through the lifter, the hook block, and the tripping coil. The lifter is slidably connected inside the plug housing. An extension arm is provided on the side of the lifter, extending below the spring piece. The hook block is rotatably mounted inside the lifter. An annular flange is provided on the armature, contacting the surface of the hook block. A first hook engagement portion is provided on the top of the hook block. A reset button is elastically connected to the plug housing by a second spring. One end of the second spring contacts the back of the pressing part of the reset button, and the other end contacts the circuit board. The bottom of the reset button is provided with a second hook for hooking with the first hook. The contact surface between the second hook and the first hook is an inclined surface.
2. A plug-in type residual current operated protective device according to claim 1, characterized in that, The hook block is provided with a sliding groove whose shape matches the annular flange, and the annular flange is slidably connected in the sliding groove.
3. A plug-in type residual current operated protective device according to claim 1, characterized in that, The contact surface between the extended arm and the spring piece is an arc surface.
4. A plug-in type residual current operated protective device according to claim 1, characterized in that, The lifting device is equipped with a stop block whose position corresponds to the first hook part.
5. A plug-in type residual current operated protective device according to claim 1, characterized in that, The plug housing has a recessed portion on its surface, and the reset button is located on the bottom surface of the recessed portion.
6. A plug-in type residual current operated protective device according to claim 1, characterized in that, The plug housing has anti-slip grooves on one opposite side surface.