Leakage protector

Abstract

The application discloses a kind of electric leakage protector, the electric leakage protector includes shell assembly, button, hook plate, jump mechanism and linkage;Static contact is equipped in shell assembly;Button is located on shell assembly and is elastically connected with it by reset piece;Hook plate is respectively connected with button, jump mechanism, linkage, jump mechanism is equipped with movable contact;Electromagnet is located in shell assembly, electromagnet includes moving iron core and yoke, moving iron core is movably matched with linkage;When pressing button, button moves to be hooked with hook plate, hook plate moves jump mechanism, to make static contact and movable contact fast connect, and hook plate drives linkage to rotate, to drive moving iron core and yoke contact and attract, maintain the hooking state of button and hook plate.The electric leakage protector is improved, movable contact and static contact can be contacted with certain contact pressure instantaneously, solve the problem of poor connection caused by slow operation of existing electric leakage protector, eliminate the security risk, improve the electrical safety.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic switch manufacturing technology, and in particular 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] Existing residual current devices (RCDs) include a leakage current detection device, a stationary contact, a reset button, and a moving contact frame. The moving contact frame is hinged to the leakage current detection device and has a moving contact. However, many potential faults in RCDs are related to operating speed. At the moment of connection, slow operation can lead to low contact pressure, or even a state where the contacts are only partially connected. This can generate a high electric arc. If a short circuit occurs, the electromagnetic switch can easily burn out or the contacts can become welded together, failing to provide safety protection during leakage. Summary of the Invention

[0004] The main objective of this invention is to provide a leakage current protection device that enables the moving and stationary contacts to connect instantaneously with a certain contact pressure, thereby eliminating safety hazards and improving electrical safety.

[0005] To achieve the above objectives, the present invention provides a residual current device (RCD), comprising:

[0006] A housing assembly, wherein a stationary contact is provided within the housing assembly;

[0007] A button is provided on the housing assembly and is elastically connected to it via a reset member;

[0008] A hook plate is disposed within the housing assembly and is movably connected to the button;

[0009] A snap-start mechanism is disposed within the housing assembly and movably connected to the hook plate; the snap-start mechanism is provided with a moving contact.

[0010] A linkage component, disposed within the housing assembly and movably connected to the hook plate; and

[0011] An electromagnet is disposed within the housing assembly. The electromagnet includes a moving iron core and a yoke. The moving iron core is movably engaged with the linkage component.

[0012] When the button is pressed, the button moves to engage with the hook plate. The hook plate drives the snap mechanism to move so that the stationary contact and the moving contact are quickly connected. The hook plate also drives the linkage to rotate so that the moving iron core contacts and the yoke to engage, maintaining the hook state between the button and the hook plate.

[0013] Optionally, the snap-action mechanism includes a locking block, a movable contact frame, and an unlocking component movably disposed on the movable contact frame. The locking block is rotatably disposed within the housing assembly and elastically connected to it. The movable contact is disposed on the movable contact frame, and the movable contact frame is rotatably disposed within the housing assembly and elastically abuts against it. The unlocking component is elastically connected to the movable contact frame via a snap-action elastic element, and the hook plate is rotatably disposed on the unlocking component.

[0014] The movable contact has a locked state and an unlocked state. In the locked state, the locking block moves against the movable contact to lock the movable contact. In the unlocked state, the locking block releases the locking of the movable contact, and the movable contact contacts the stationary contact.

[0015] Optionally, the hook plate is provided with a hooking part that hooks with the button and a first pivot that is pivotally connected to the unlocking member. The hooking part is composed of a hooking surface on the hook plate and a groove located on the lower side of the hooking surface.

[0016] Optionally, the hook plate is provided with side ribs that are connected to the linkage, and the side ribs are disposed opposite to the hooking part.

[0017] Optionally, the button is provided with a hook that is adapted to hook onto the corresponding position of the attachment part.

[0018] Optionally, the locking block is provided with a support part, a side plate, a first boss and a second rotating shaft. The support part is movably abutted against the movable contact frame to lock the movable contact frame. The side plate is movably abutted against the unlocking member. The first boss abuts against the housing assembly through a first elastic member. The second rotating shaft is pivotally connected to the housing assembly.

[0019] Optionally, the locking block is provided with a first limiting block that engages with the housing assembly to limit the rotation range of the locking block.

[0020] Optionally, the movable contact frame is provided with a second limiting block that abuts and adapts to the support portion, a through hole that is pivotally connected to the housing assembly, a first sliding groove and a second sliding groove that slide with the unlocking member, and a second boss, wherein the second boss abuts against the housing assembly through a second elastic member.

[0021] Optionally, the unlocking component includes a pushing part that abuts against the locking block, a sliding hook that is slidably disposed in the first slide groove or the second slide groove, and a shaft hole for the end of the first rotating shaft to be inserted.

[0022] Optionally, the movable contact frame is provided with a receiving groove for accommodating the snap-fit ​​elastic member, the receiving groove is provided with a third protrusion, the unlocking member is provided with a fourth protrusion disposed opposite to the third protrusion, one end of the snap-fit ​​elastic member is sleeved on the third protrusion, and the other end of the snap-fit ​​elastic member is sleeved on the fourth protrusion.

[0023] In the technical solution of this invention, the residual current device (RCD) includes a housing assembly, a button, a hook plate, a tripping mechanism, and a linkage component. The housing assembly contains a stationary contact. The button is mounted on the housing assembly and elastically connected to it via a reset component. The hook plate is movably connected to the button, the tripping mechanism, and the linkage component, respectively. The tripping mechanism has a moving contact. An electromagnet is located within the housing assembly, comprising a moving iron core and a yoke. The moving iron core is movably engaged with the linkage component. When the button is pressed, it moves to a position where it hooks with the hook plate. The hook plate drives the tripping mechanism to move, causing the stationary contact and the moving contact to quickly connect. Simultaneously, the linkage component drives the moving iron core to contact and engage with the yoke, maintaining the hook connection between the button and the hook plate. This achieves instantaneous connection of the moving and stationary contacts with a certain contact pressure, solving the problem of poor connection caused by slow operation in existing RCDs, eliminating safety hazards, and improving electrical safety. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of an embodiment of the leakage current protection device of the present invention;

[0026] Figure 2 This is a cross-sectional view of the leakage current protection device of the present invention in its initial non-operating state in one embodiment;

[0027] Figure 3 This is a cross-sectional view of the tripping mechanism in a locked state in one embodiment of the leakage current protection device of the present invention;

[0028] Figure 4 This is a cross-sectional view of the tripping mechanism in a critical unlocking state in one embodiment of the leakage current protection device of the present invention.

[0029] Figure 5This is a cross-sectional view of the leakage current protection device of the present invention in the circuit-on state according to an embodiment;

[0030] Figure 6 This is a partial cross-sectional view of the leakage current protection device of the present invention in the circuit-on state according to an embodiment;

[0031] Figure 7 This is a schematic diagram of the main components in one embodiment of the leakage current protection device of the present invention;

[0032] Figure 8 This is a schematic diagram of the button structure in one embodiment of the leakage current protection device of the present invention;

[0033] Figure 9 This is a schematic diagram of the front structure of the hook plate in one embodiment of the leakage current protection device of the present invention;

[0034] Figure 10 This is a schematic diagram of the back structure of the hook plate in one embodiment of the leakage current protection device of the present invention;

[0035] Figure 11 This is a schematic diagram of the front structure of the locking block in one embodiment of the leakage current protection device of the present invention;

[0036] Figure 12 This is a schematic diagram of the back structure of the locking block in one embodiment of the leakage current protection device of the present invention;

[0037] Figure 13 This is a schematic diagram of the unlocking component in one embodiment of the leakage current protection device of the present invention;

[0038] Figure 14 for Figure 13 Sectional view at point AA;

[0039] Figure 15 This is a schematic diagram of the moving contact frame in one embodiment of the leakage current protection device of the present invention;

[0040] Figure 16 for Figure 15 Sectional view at point BB;

[0041] Figure 17 This is a connection structure diagram of the moving contact frame and the unlocking component in one embodiment of the leakage current protection device of the present invention;

[0042] Figure 18 This is a schematic diagram of the linkage component in one embodiment of the leakage current protection device of the present invention.

[0043] Explanation of icon numbers:

[0044] 10. Housing assembly; 20. Button; 30. Hook plate; 40. Snap-on mechanism; 50. Linkage component; 60. Electromagnet; 21. Reset component; 101. Stationary contact; 401. Moving contact; 61. Moving iron core; 62. Yoke; 41. Locking block; 42. Moving contact frame; 43. Unlocking component; 44. Snap-on elastic component; 301. Hooking part; 302. First rotating shaft; 303. Side rib; 30a. Groove; 201. Hook; 411. Support part; 412. Side plate; 413. First boss; 41 4. Second pivot; 415. First elastic element; 416. First limiting block; 421. Second limiting block; 42a. Through hole; 42b. First sliding groove; 42c. Second sliding groove; 422. Second boss; 423. Second elastic element; 431. Pushing part; 432. Sliding hook; 424. Third boss; 433. Fourth boss; 43a. Pivot hole; 51. First push rod; 52. Second push rod; 53. Indicator; 54a. Opening groove; 541. First surface; 542. Second surface.

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0048] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0049] Many potential malfunctions of existing residual current devices (RCDs) on the market are related to operating speed. Slow operation at the moment of connection results in low contact pressure, or even a state of partial continuity between the contacts, leading to a high-voltage arc. If a short circuit occurs, the electromagnetic switch can easily burn out or the contacts can become welded together, failing to provide safety protection during leakage. Furthermore, the residual current tripping coil requires a large holding force, resulting in high power consumption, increased temperature of the RCD, and a limited application range. Especially in vibrating environments, the electromagnetic switch is prone to accidental tripping, affecting normal operation.

[0050] In response, this invention proposes a leakage current protection device.

[0051] refer to Figures 1 to 7 In one embodiment of the present invention, the leakage current protector includes a housing assembly 10, a button 20, a hook plate 30, a snap-action mechanism 40, and a linkage member 50; the housing assembly 10 is provided with a stationary contact 101; the button 20 is disposed on the housing assembly 10 and elastically connected to it through a reset member 21; the hook plate 30 is disposed in the housing assembly 10 and movably connected to the button 20; the snap-action mechanism 40 is disposed in the housing assembly 10 and movably connected to the hook plate 30, and the snap-action mechanism 40 is provided with a moving contact 401; the linkage member 50 is disposed in the housing assembly 10 and movably connected to the hook plate 30; the electromagnet 60 is disposed in the housing assembly 10, and the electromagnet 60 includes a moving iron core 61 and a yoke 62, the moving iron core 61 being movably engaged with the linkage member 50.

[0052] After the button 20 is pressed, the button 20 moves to the position where it hooks with the hook plate 30. The spring of the linkage between the housing assembly 10 and the linkage 50 pushes the linkage 50, so that the linkage 50 drives the hook plate 30 to hook together with the button 20. The hook plate 30 drives the snap mechanism 40 to move so that the stationary contact 101 and the moving contact 401 are quickly connected. At the same time, the linkage 50 drives the moving iron core 61 to contact and attract the yoke 62, maintaining the hook state between the button 20 and the hook plate 30.

[0053] In this embodiment, the housing assembly 10 may include components such as a base, an inner shell, and an outer shell, which are not limited here. Among them, the stationary contact 101 may be disposed on the base.

[0054] The linkage 50 can be a push plate, push block, etc., which can be pivotally connected to the base of the housing assembly 10 via a rotating shaft to achieve rotation. One end of the linkage 50 is movably engaged with the hook plate 30, and the other end is movably engaged with the moving iron core 61. The specific structure of the linkage 50 is not limited here.

[0055] refer to Figures 7 to 10 In this embodiment, the hook plate 30 may be provided with a hooking part 301 that hooks with the button 20, and the button 20 is provided with a hook 201 that is adapted to hook the hooking part 301 at the corresponding position. The reset member 21 may be a reset spring or the like, and is not limited here.

[0056] By adopting the above structure, the present invention enables the moving contact 401 and the stationary contact 101 to be connected instantaneously with a certain contact pressure, which solves the problem of poor connection caused by slow operation in existing leakage current protection devices, eliminates safety hazards, and improves electrical safety.

[0057] It is understood that the connection speed of the moving contact 401 of the leakage current protector of the present invention is independent of the operating speed. During connection, the snap-fit ​​structure ensures rapid and stable contact pressure and reliable contact connection. Even if a short circuit occurs, the switch will not burn out or the contacts will not weld together. It ensures safe tripping during leakage, achieving the function of safety protection. During connection, the leakage current trip coil provides energy to maintain the tripping torque at the hook plate 30 through the bridge plate. Under the same tripping torque, the holding force required from the leakage current trip coil is smaller, resulting in lower power consumption, lower temperature rise of the leakage current switch, and easier for the switch to meet standard requirements. Furthermore, because the holding force required from the leakage current trip coil is smaller under the same tripping torque, the leakage current trip coil has more margin within the standard range to meet high-requirement vibration-resistant environments, thus broadening its applicability.

[0058] Main reference Figure 1 , Figure 7 and Figure 17In one embodiment, the snap-action mechanism 40 may include a locking block 41, a movable contact frame 42, and an unlocking member 43 movably disposed on the movable contact frame 42. The locking block 41 is rotatably disposed within the housing assembly 10 and elastically connected thereto. The movable contact 401 is disposed on the movable contact frame 42, which is rotatably disposed within the housing assembly 10 and elastically abuts against it. The unlocking member 43 is elastically connected to the movable contact frame 42 via a snap-action elastic member 44, and the hook plate 30 is rotatably disposed on the unlocking member 43. The movable contact frame 42 has a locked state and an unlocked state. In the locked state, the locking block 41 abuts against the movable contact frame 42 to lock the movable contact frame 42. In the unlocked state, the locking block 41 releases the lock on the movable contact frame 42, and the movable contact 401 contacts the stationary contact 101.

[0059] Among them, the snap-up elastic element 44 can be a snap-up spring, etc., and the first elastic element 415 and the second elastic element 423 described below can both be springs, which is not limited here.

[0060] refer to Figure 9 and Figure 10 In this embodiment, the hook plate 30 is provided with a first pivot 302 that is pivotally connected to the unlocking member 43 and a side rib 303 that is connected to the linkage member 50.

[0061] One end of the hook plate 30 is provided with a hooking surface, which can be connected to the hook 201 of the button 20. A leg extends from each side of the hooking end of the hook plate 30, and a first pivot 302 is provided at the end of the leg. A groove 30a is formed between the two legs and the hooking surface. The hooking surface and the groove 30a together constitute the hooking part 301. The side rib 303 is provided on the back of the groove 30a.

[0062] refer to Figure 9 and Figure 14 The first pivot 302 is pivotally connected to the pivot hole 43a of the unlocking member 43. The hook plate 30 can rotate around the pivot hole 43a of the unlocking member 43. The groove 30a provides space for the hook 201 of the button 20 to hook onto the hooking surface of the hook plate 30. The side rib 303 of the hook plate 30 is connected to the linkage member 50. Under the action of the linkage member spring, the linkage member 50 always abuts against the side rib 303.

[0063] The distance between the first rotating shaft 302 and the hooking surface is relatively long. When the base of the housing assembly 10 is defective due to poor assembly or manufacturing precision, the long lever arm between the first rotating shaft 302 and the hooking surface rotates around the first rotating shaft 302 at a small swing angle, causing the hook 201 to produce a large displacement, thus ensuring the reliability of the hooking between the button 20 and the hook plate 30. In other words, the long lever arm of the hook plate 30 can compensate for assembly or manufacturing errors.

[0064] It should be noted that after button 20 is pressed, the return spring is compressed. When button 20 moves down to a certain position, its hook 201 engages with the hook plate 30's hooking part 301, which is pushed by the linkage 50. During this process, the linkage 50 rotates and drives the two to remain engaged. At the same time, the linkage 50 drives the moving iron core 61 to move. When energized, the moving iron core 61 and the yoke 62 are attracted together by electromagnetic force. After button 20 is released, under the rebound force of the return spring, button 20 drives the hook plate 30, the unlocking part 43 hinged to the hook plate 30, and the moving contact frame 42 movably connected to the unlocking part 43 to move together. The moving contact frame spring, located between the base and the moving contact frame 42, is compressed by force. When the movable contact 42 moves to a certain position, under the action of the locking block spring located between the base and the locking block 41, the locking block 41 abuts against the movable contact 42, causing the movable contact 42 to stop moving. Meanwhile, the button 20 continues to drive the hook plate 30 and the unlocking member 43 connected to the hook plate 30 to continue moving. The snap-fit ​​elastic member 44 located between the unlocking member 43 and the movable contact 42 is compressed and deformed to store elastic properties. During the continued movement of the unlocking member 43, the unlocking member 43 pushes the locking block 41 to release the locking relationship between it and the movable contact 42. The snap-fit ​​elastic member 44 located between the unlocking member 43 and the movable contact 42 experiences a force imbalance and returns to its original state, releasing its elastic properties to drive the movable contact 401 located on the movable contact 42 to quickly connect with the stationary contact 101 on the base.

[0065] In the event of a power outage or leakage current, the electromagnetic force between the moving iron core 61 and the yoke 62 disappears. Under the elastic force of the moving contact frame spring, the linkage 50 cannot maintain the latching relationship between the hook plate 30 and the button 20. The hook plate 30 releases the latching state between itself and the button 20, and the moving contact 401 on the moving contact frame 42 quickly disconnects from the stationary contact 101 on the base to ensure electrical safety.

[0066] Main reference Figure 11 and Figure 12 In one embodiment, the locking block 41 may be provided with a support 411, a side plate 412, a first boss 413 and a second pivot 414. The support 411 is in movable contact with the movable contact frame 42 to lock the movable contact frame 42. The side plate 412 is in movable contact with the unlocking member 43. The first boss 413 is in contact with the housing assembly 10 through a first elastic member 415. The second pivot 414 is pivotally connected to the housing assembly 10.

[0067] In this embodiment, the locking block 41 is provided with a first limiting block 416 that is engaged in the housing assembly 10 to limit the rotation range of the locking block 41.

[0068] The second pivot 414 is pivotally connected to the base of the housing assembly 10. The first limiting block 416 restricts the rotation range of the locking block 41, preventing excessive rotation and interference between the side plate 412 and the spring-loaded elastic member 44. The support portion 411 can be two support surfaces located at the end of the locking block 41, with the support surfaces abutting against the second limiting block 421 of the movable contact frame 42, thus maintaining a locked relationship between the locking block 41 and the movable contact frame 42. When the button 20 drives the unlocking member 43 to continue moving upward, the unlocking member 43 pushes the side plate 412 of the locking block 41, causing the locking block 41 to release the locking relationship with the movable contact frame 42. The first elastic member 415 connects the first boss 413 and the base of the housing assembly 10, ensuring that the locking block 41 always tends towards the movable contact frame 42 and the unlocking member 43.

[0069] refer to Figures 15 to 17 In one embodiment, the movable contact frame 42 may be provided with a second limiting block 421 that abuts and adapts to the support portion 411, a through hole 42a that is pivotally connected to the housing assembly 10, a first sliding groove 42b and a second sliding groove 42c that slides and cooperates with the unlocking member 43, and a second boss 422, the second boss 422 abutting against the housing assembly 10 through a second elastic member 423.

[0070] refer to Figure 13 and Figure 14 In this embodiment, the unlocking member 43 is provided with a pushing part 431 for pushing the locking block 41 to move, and the unlocking member 43 is provided with a sliding hook 432, which is slidably disposed in the first sliding groove 42b or the second sliding groove 42c. The unlocking member 43 is provided with a pivot hole 43a, and the end of the first pivot 302 is inserted into the pivot hole 43a.

[0071] Furthermore, such as Figure 16 As shown, the movable contact frame 42 is provided with a receiving groove for accommodating the spring-loaded elastic element 44, and a third protrusion 424 is provided in the receiving groove, such as... Figure 14 As shown, the unlocking member 43 is provided with a fourth protrusion 433 that is disposed opposite to the third protrusion 424, such as Figure 17 As shown, one end of the snap-fit ​​elastic member 44 is sleeved on the third boss 424, and the other end of the snap-fit ​​elastic member 44 is sleeved on the fourth boss 433.

[0072] Along the movement path of button 20, the first elastic element 415 on the locking block 41 causes the second limiting block 421 of the movable contact frame 42 to engage with the support portion 411 of the locking block 41, thus locking the movable contact frame 42. The sliding hook 432 of the unlocking member 43 slides in the second slide groove 42c of the movable contact frame 42. As it continues to move along the second slide groove 42c, the sliding hook 432 of the unlocking member 43 hooks onto the contact surface between the first slide groove 42b and the second slide groove 42c. The sliding hook 432 slides into the first slide groove 42b, allowing the unlocking member 43 to move along the height direction of the movable contact frame 42 within the first slide groove 42b, i.e., to move up and down.

[0073] In this embodiment, the two ends of the second elastic member 423 can be respectively sleeved on the first protrusion 413 and the base; the two ends of the snap-fit ​​elastic member 44 can be respectively disposed on the third protrusion 424 of the movable contact frame 42 and the fourth protrusion 433 of the unlocking member 43. The through hole 42a of the movable contact frame 42 is pivotally connected to the base of the housing assembly 10.

[0074] refer to Figure 18 In one embodiment, the linkage 50 may include a first push rod 51, a second push rod 52, and an indicator 53. The linkage 50 may be provided with a rotating shaft and a boss. The linkage 50 may be integrally molded or assembled separately. The first push rod 51 has a first driving end with rounded corners to movably engage with the side rib 303 of the hook plate 30. Under the action of the linkage spring, it always abuts against the side rib 303. The second push rod 52 has a second driving end with an opening groove 54a. The opening groove 54a has a first surface 541 and a second surface 542 that abut against the outer wall of the moving iron core 61.

[0075] The opening slot 54a is movably engaged with the moving iron core 61 of the electromagnet; when the leakage current protection device is in the off state, the moving iron core 61 is perpendicularly abutting against the first surface 541; when the leakage current protection device is in the on state, the moving iron core 61 is perpendicularly abutting against the second surface 542.

[0076] In this embodiment, the lever arm length of the second push rod 52 can be greater than that of the first push rod 51. This reduces effort, resulting in a smaller holding force for the electromagnet 60, lower power consumption, and reduced coil temperature rise. Furthermore, the linkage 50 can be disposed in the cavity between the hook plate 30 and the electromagnet 60, resulting in a compact structure that facilitates product miniaturization and cost reduction.

[0077] like Figure 1 and Figure 2 As shown, when the leakage current switch is in the initial non-operational disconnected state, the snap-action mechanism 40 is in the unlocked position, the locking block 41 does not abut against the moving contact frame 42, one end of the linkage 50 abuts against the hook plate 30, and the other end is connected to the moving iron core 61. The hook plate 30 is in the disengaged state from the button, and the moving contact 401 on the moving contact frame 42 and the stationary contact 101 on the base are in the disconnected position.

[0078] like Figure 3As shown, when the residual current device (RCD) starts working, the locking block 41 just abuts against the moving contact frame 42, meaning the snap-action mechanism 40 is just locked. During this process, the button 20 moves downward, and the hook 201 of the button 20 engages with the hook plate 30's hooking part 301. The linkage 50, under the action of the linkage spring located between the base and the linkage 50, pivots through the rotating shaft, driving the moving iron core 61 and the yoke 62 to contact and engage. The attraction force of the electromagnet 60 ensures the engagement between the button 20 and the hook plate 30 through the linkage 50. After releasing the button 20, under the return force of the reset spring, the button 20 moves the hook plate 30 and the snap-action mechanism 40 connected to the hook plate 30. When it reaches a certain position, the locking block 41 abuts against the moving contact frame 42, locking the moving contact frame 42 and preventing it from moving.

[0079] like Figure 4 As shown, the snap-action mechanism 40 is in a critical unlocking state. During this process, the button 20 continues to move under the restoring force of the return spring, causing the hook plate 30 and the unlocking component 43, which is pivotally connected to the hook plate 30, to move together. The push plate of the unlocking component 43 pushes the side plate 412 of the locking block 41 to gradually release the locking block 41 from locking the moving contact frame 42. The moving contact frame 42 is locked by the locking block 41 and cannot move. The unlocking component spring, located between the moving contact frame 42 and the unlocking component 43, is compressed, storing elastic properties during the compression process, until the button 20 moves a certain distance, at which point the snap-action mechanism 40 is in a critical unlocking state.

[0080] like Figure 5 and Figure 6 As shown, the leakage current protector maintains normal operation, and the circuit is in the connected state. During this process, the locking block 41 releases the lock on the moving contact 42. The spring of the unlocking member located between the moving contact 42 and the unlocking member 43 experiences force imbalance and releases its elasticity, causing the moving contact 42 and the moving contact 401 set on the moving contact 42 to move rapidly. The moving contact 401 makes contact with the stationary contact 101 fixed on the base with a certain contact pressure. Under the action of the electromagnet 60, the moving and stationary contacts 101 are kept in the contact position, so that the circuit is in the connected state.

[0081] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A residual current device (RCD), characterized in that, include: A housing assembly, wherein a stationary contact is provided within the housing assembly; A button is provided on the housing assembly and is elastically connected to it via a reset member; A hook plate is disposed within the housing assembly and is movably connected to the button; A snap-action mechanism is disposed within the housing assembly and movably connected to the hook plate. The snap-action mechanism has a movable contact. The snap-action mechanism includes a locking block, a movable contact frame, and an unlocking component movably disposed on the movable contact frame. The locking block is rotatably disposed within the housing assembly and elastically connected to it. The movable contact is disposed on the movable contact frame, and the movable contact frame is rotatably disposed within the housing assembly and elastically abuts against it. The unlocking component is elastically connected to the movable contact frame via a snap-action elastic element, and the hook plate is rotatably disposed on the unlocking component. The movable contact frame has a locked state and an unlocked state. In the locked state, the locking block movably abuts against the movable contact frame to lock the movable contact frame. In the unlocked state, the locking block releases the lock on the movable contact frame, and the movable contact contacts the stationary contact. A linkage component is disposed within the housing assembly and is movably connected to the hook plate; as well as An electromagnet is disposed within the housing assembly. The electromagnet includes a moving iron core and a yoke. The moving iron core is movably engaged with the linkage component. When the button is pressed, the button moves to engage with the hook plate. The hook plate drives the snap mechanism to move so that the stationary contact and the moving contact are quickly connected. The hook plate also drives the linkage to rotate so that the moving iron core contacts and the yoke to engage, maintaining the hook state between the button and the hook plate.

2. The residual current device as described in claim 1, characterized in that, The hook plate is provided with a hooking part that hooks with the button and a first pivot that is pivotally connected to the unlocking component. The hooking part is composed of a hooking surface on the hook plate and a groove located on the lower side of the hooking surface.

3. The residual current device as described in claim 2, characterized in that, The hook plate is provided with side ribs that are connected to the linkage component, and the side ribs are arranged opposite to the hooking part.

4. The residual current device as described in claim 2, characterized in that, The button is provided with a hook at the position corresponding to the hooking part.

5. The residual current device as described in claim 2, characterized in that, The locking block is provided with a support part, a side plate, a first boss and a second rotating shaft. The support part is movably abutted against the movable contact frame to lock the movable contact frame. The side plate is movably abutted against the unlocking member. The first boss abuts against the housing assembly through a first elastic member. The second rotating shaft is pivotally connected to the housing assembly.

6. The residual current device as described in claim 5, characterized in that, The locking block is provided with a first limiting block that engages with the housing assembly to limit the rotation range of the locking block.

7. The residual current device as described in claim 5, characterized in that, The movable contact frame is provided with a second limiting block that abuts and adapts to the support portion, a through hole that is pivotally connected to the housing assembly, a first sliding groove and a second sliding groove that slide with the unlocking member, and a second boss. The second boss abuts against the housing assembly through a second elastic member.

8. The residual current device as described in claim 7, characterized in that, The unlocking component is provided with a pushing part that abuts against the locking block, a sliding hook that is slidably disposed in the first slide groove or the second slide groove, and a rotating shaft hole for the end of the first rotating shaft to be inserted.

9. The residual current device as described in claim 8, characterized in that, The movable contact frame is provided with a receiving groove for accommodating the snap-fit ​​elastic member. A third protrusion is provided in the receiving groove. The unlocking member is provided with a fourth protrusion opposite to the third protrusion. One end of the snap-fit ​​elastic member is sleeved on the third protrusion, and the other end of the snap-fit ​​elastic member is sleeved on the fourth protrusion.

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