Plug type residual current operated protector

Abstract

The invention discloses a plug type residual current operated protector. The plug type residual current operated protector comprises a plug shell; the tripping module comprises a yoke, an armature, a lifter and a hook block, one end of the armature is elastically connected to the plug shell through a first spring, the lifter is slidably connected to the interior of the plug shell, an extension arm is arranged on the side face of the lifter and extends to the position below the elastic piece, the hook block is rotatably installed in the lifter, and a first hooking part is arranged at the top of the hook block; the reset key is elastically connected to the plug shell through a second spring, one end of the second spring is in contact with the back face of the pressing part of the reset key, the opposite end of the second spring is in contact with the circuit board, a second hooking part used for being hooked with the first hooking part is arranged at the bottom of the reset key, and the contact face of the second hooking part and the first hooking part is an inclined face. Compared with the prior art, the electric leakage protection tripping device solves the problems that an existing electric leakage protection tripping device in a power plug is complex in structure and poor in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of leakage protectors, in particular to a plug-type residual current operated protector. Background Art

[0002] Household appliances are connected to the mains power supply via a power plug. A leakage protection mechanism is built into the power plug to provide immediate protection for both the appliance and personnel. This mechanism cuts off power within 0.03-0.1 seconds if the residual current exceeds a set threshold (usually ≤30mA).

[0003] In the leakage protection structure of the existing power plug, the tripping device for connecting or disconnecting the moving contact and the static contact has a complex structure and poor reliability, resulting in a safety hazard of the power plug. Summary of the Invention

[0004] The object of the present invention is to provide a plug-type residual current operated protector to solve the problems of complex structure and poor reliability of the existing leakage protection tripping device in the power plug.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a plug-type residual current operated protector, comprising:

[0006] The plug housing has a circuit board inside, and an electrostatic contact is provided on the circuit board. One end of the spring is fixedly installed in the plug housing, and the free end of the spring is provided with a moving electric contact corresponding to the position of the electrostatic contact;

[0007] The trip module includes a yoke, an armature, a lifter, and a hook block. The yoke is arranged in the trip coil, the armature position corresponds to the yoke, one end of the armature is elastically connected to the plug housing via a first spring, the armature is passed through the lifter, the hook block, and the trip coil, the lifter is slidably connected to the plug housing, a protruding arm is provided on the side of the lifter, the protruding arm extends below the spring piece, the hook block is rotatably installed in the lifter, an annular flange is provided on the armature, the annular flange contacts the surface of the hook block, and a first hooking portion is provided on the top of the hook block;

[0008] The reset button is elastically connected to the plug housing via a second spring. One end of the second spring contacts the back of the pressing portion of the reset button, and the other end contacts the circuit board. A second hook portion for hooking with the first hook portion is provided at the bottom of the reset button. The contact surface between the second hook portion and the first hook portion is an inclined surface.

[0009] As a further description of the above technical solution:

[0010] A sliding groove with a shape matching the annular flange is provided on the block, and the annular flange is slidably connected in the sliding groove.

[0011] As a further description of the above technical solution:

[0012] The contact surface between the extending arm and the spring is an arc surface.

[0013] As a further description of the above technical solution:

[0014] A stopper is provided inside the lifter and its position corresponds to the first hooking portion.

[0015] As a further description of the above technical solution:

[0016] A recessed portion is provided on the surface of the plug housing, and a reset button is provided on the bottom surface of the recessed portion.

[0017] As a further description of the above technical solution:

[0018] An anti-slip groove is provided on an opposite side surface of the plug housing.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] 1. In the present invention, because the second hooking portion at the bottom of the reset button and the first hooking portion on the hook block have an inclined contact surface when they are hooked, the reset button and the hook block will not become locked. When a leakage fault occurs, the armature and yoke lose their electromagnetic attraction, causing the hook block to no longer be positioned by the armature and allowing the hook block to rotate. As a result, the reset button moves upward under the elastic force of the second spring, causing the reset button to decouple from the hook block. This in turn causes the lifter to move downward under the influence of its own weight and the elastic force exerted by the spring clip on the extension arm, separating the dynamic electric contact at the end of the spring clip from the electrostatic contact, quickly disconnecting the circuit. The hook block does not need to be provided with a torsion spring at the rotating shaft to achieve disengagement from the reset button, as in the prior art. This effectively simplifies the trip module structure of the plug-type residual current operated protector and improves the reliability of leakage protection.

[0021] 2. In the present invention, a stopper is provided inside the lifter, corresponding to the first hooking portion. When the hooking portion is rotated to a vertical position, the portion of the first hooking portion that extends beyond the second hooking portion is held against the stopper, thereby limiting the rotation angle of the hooking portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 The figure is a structural diagram of a plug-type residual current protective device.

[0024] Figure 2 This is a partial cross-sectional view of a plug-type residual current protective device.

[0025] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0026] Figure 4 A schematic diagram of the tripping module in a plug-type residual current protective device Figure 1 .

[0027] Figure 5 A schematic diagram of the tripping module in a plug-type residual current protective device Figure 2 .

[0028] Figure 6 This is a schematic diagram of the power supply status of the trip module in a plug-type residual current protective device. Figure 1 .

[0029] Figure 7 This is a schematic diagram of the power supply status of the trip module in a plug-type residual current protective device. Figure 2 .

[0030] Figure 8 A schematic diagram of pressing the reset button of a trip module in a plug-type residual current operated protective device.

[0031] Legend:

[0032] 1. Plug housing; 11. Circuit board; 12. Electrostatic contact; 13. Spring; 131. Dynamic contact; 14. Recess; 15. Anti-slip groove; 2. Trip module; 21. Yoke; 211. Trip coil; 22. Armature; 221. First spring; 222. Annular flange; 23. Lifter; 231. Extending arm; 232. Stopper; 24. Hook; 241. Slide groove; 3. Reset button; 31. Second spring. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1-8 The present invention provides a technical solution: a plug-type residual current action protector, comprising:

[0036] The plug housing 1 has a circuit board 11 disposed therein, on which an electrostatic contact 12 is disposed. One end of a spring 13 is fixedly mounted within the plug housing 1, and a moving electric contact 131 is disposed at the free end of the spring 13, the position of which corresponds to that of the electrostatic contact 12.

[0037] The trip module 2 includes a yoke 21, an armature 22, a lifter 23, and a hook block 24. The yoke 21 is arranged in the trip coil 211. The position of the armature 22 corresponds to the yoke 21. One end of the armature 22 is elastically connected to the plug housing 1 through a first spring 221. The armature 22 is passed through the lifter 23, the hook block 24, and the trip coil 211. The lifter 23 is slidably connected to the plug housing 1. A protruding arm 231 is provided on the side of the lifter 23. The protruding arm 231 extends below the spring 13. The hook block 24 is rotatably installed in the lifter 23. An annular flange 222 is provided on the armature 22. The annular flange 222 contacts the surface of the hook block 24. A first hooking portion is provided on the top of the hook block 24.

[0038] The reset button 3 is elastically connected to the plug housing 1 via a second spring 31. One end of the second spring 31 contacts the back of the pressing portion of the reset button 3, and the other end contacts the circuit board 11. A second hook portion is provided at the bottom of the reset button 3 for hooking with the first hook portion. The contact surface between the second hook portion and the first hook portion is an inclined surface.

[0039] See attached Figure 2-4 Because the second hooking portion at the bottom of the reset button 3 and the first hooking portion on the hook block 24 form an inclined surface when they engage, the reset button 3 and the hook block 24 will not become locked. When a leakage fault occurs, the armature 22 and yoke 21 lose their electromagnetic attraction, causing the hook block 24 to no longer be positioned by the armature 22 and allowing the hook block 24 to rotate. As a result, the reset button 3 moves upward under the elastic force of the second spring 31, causing the reset button 3 to decouple from the hook block 24. This in turn causes the lifter 23 to move downward under its own weight and the elastic force applied by the spring clip 13 on the extended arm 231. The dynamic contact 131 at the end of the spring clip 13 separates from the electrostatic contact 12, quickly disconnecting the circuit. The hook block 24 no longer requires a torsion spring at the rotating shaft to disconnect from the reset button 3, as is required in the prior art. This effectively simplifies the structure of the trip module 2 of the plug-type residual current operated protective device and improves the reliability of leakage protection.

[0040] The contact surface between the extending arm 231 and the elastic sheet 13 is an arc surface, which effectively prevents the elastic sheet 13 from being damaged when the extending arm 231 squeezes the elastic sheet 13 , thereby protecting the elastic sheet 13 .

[0041] The plug housing 1 has a recessed portion 14 on its surface, and the reset button 3 is disposed on the bottom of the recessed portion 14. The top of the reset button 3 penetrates the bottom of the recessed portion 14, which reduces the height of the reset button 3 extending from the surface of the plug housing 1 and protects the reset button 3.

[0042] An anti-slip groove 15 is provided on one opposite side surface of the plug housing 1. The anti-slip groove 15 comprises three concentrically arranged arc-shaped grooves, the depth of which gradually decreases from bottom to top, making it easier to pull out the plug and improving safety in use.

[0043] Working principle: The output terminal of the leakage protector is connected to the electrical appliance, and the reset button 3 is not operated. Figure 5 .

[0044] See attached Figure 8 When the RESET button (i.e., reset button 3) is pressed, the reset button 3 descends against the spring force, and the lower inclined surface of the second hook portion at the bottom of the reset button 3 presses the upper inclined surface of the first hook portion 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 portion of the reset button 3 is blocked by the PCB (i.e., the circuit board 11). Then, the second hooking portion of the reset button 3 no longer presses the first hooking portion, and the hook block 24 rotates and resets under the elastic force of the first spring 221. The reset button 3 is hooked on the hook block 24, and the armature 22 simultaneously moves toward the yoke 21, and the armature 22 contacts the yoke 21.

[0046] Then release the reset button 3, see the attached Figure 6-7 , the reset button 3 pulls the hook block 24 upward, the relative position of the hook block 24 and the armature 22 changes, the lifter 23 moves upward with the hook block 24, and the lifter 23 squeezes the free end of the spring 13 by extending the arm 231 to bend upward, and the dynamic electric contact 131 at the end of the spring 13 contacts the electrostatic contact 12 on the PCB, realizing power supply. Note: Figure 7 The state where the spring piece 13 is squeezed and deformed is not correctly shown in the figure. The spring piece 13 should actually be located above the extending arm 231.

[0047] Under normal conditions, the moving electric contact 131 contacts the electrostatic contact 12 on the PCB, limiting the upward movement of the lifter 23, and the hook block 24 is held by the armature 22 and cannot rotate, so the reset button 3 does not rise to the limit position, and the second spring 31 is in a compressed state. Figure 6 The position of the reset button 3 in the normal state is not correctly displayed, and the reset button 3 has not actually reached the upper limit position.

[0048] Example 2

[0049] This embodiment further provides the following improved technical solution based on the above embodiment: a slide groove 241 having a shape matching that of the annular flange 222 is provided on the hook block 24 , and the annular flange 222 is slidably connected in the slide groove 241 .

[0050] The sliding groove 241 ensures that the annular flange 222 will not separate 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] This embodiment further provides the following improved technical solution based on the above embodiment: a stopper 232 is provided inside the lifter 23 and its position corresponds to the first engaging portion.

[0053] When the hook block 24 rotates to a vertical position, since the width of the first hook portion is greater than that of the second hook portion, the portion of the side end of the first hook portion that exceeds the second hook portion is stopped by the stopper 232, thereby limiting the rotation angle of the hook block 24.

[0054] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A plug-type residual current protective device, characterized in that: include: A plug housing is provided with a circuit board inside, and an electrostatic contact is provided on the circuit board. One end of a spring is fixedly mounted in the plug housing, and a moving electric contact is provided at the free end of the spring corresponding to the electrostatic contact; A trip module, comprising a yoke, an armature, a lifter, and a hook block, wherein the yoke is arranged in the trip coil, the armature position corresponds to the yoke, one end of the armature is elastically connected to the plug housing via a first spring, the armature is passed through the lifter, the hook block, and the trip coil, the lifter is slidably connected in the plug housing, a protruding arm is provided on the side of the lifter, the protruding arm extends below the spring piece, the hook block is rotatably mounted in the lifter, an annular flange is provided on the armature, the annular flange contacts the surface of the hook block, and a first hooking portion is provided on the top of the hook block; A reset button is elastically connected to the plug housing via a second spring, one end of the second spring contacts the back of the pressing portion of the reset button, and the other opposite end contacts the circuit board. A second hook portion for hooking with the first hook portion is provided at the bottom of the reset button, and the contact surface between the second hook portion and the first hook portion is an inclined surface.

2. A plug-type residual current operated protector 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. The plug-type residual current operated protector according to claim 1, characterized in that: The contact surface between the extending arm and the elastic sheet is an arc surface.

4. The plug-type residual current operated protector according to claim 1, characterized in that: A stopper is provided inside the lifter and its position corresponds to the first hooking portion.

5. The plug-type residual current operated protector according to claim 1, characterized in that: A recessed portion is provided on the surface of the plug housing, and the reset button is provided on the bottom surface of the recessed portion.

6. The plug-type residual current operated protector according to claim 1, characterized in that: An anti-slip groove is provided on an opposite side surface of the plug housing.

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