Releasing device and leakage protection device

Abstract

The present disclosure provides a releasing device to be used in a leakage protection device. The releasing device comprises a control circuit board 10; a coil assembly 20 coupled with the control circuit board 10 and at least comprising a coil bracket 21 and a static electrical contact 60 attached to the coil bracket; a movable assembly 30 attached with a movable contact arm 50, and the movable contact arm being provided with a movable electrical contact 52 corresponding to the static electrical contact; wherein the movable assembly 30 is configured to be capable of reciprocating relative to the coil assembly 20 between a first position, in which the movable electrical contact and the static electrical contact are disconnected to be in a disconnected state, and a second position, in which the movable contact arm 50 is driven by the movable assembly 30 to elastically deform so that the movable electrical contact is in contact with the static electrical contact to be in a closed state. The releasing device disclosed by the present disclosure realizes the reset function and the release function through the cooperative action of the coil assembly and the movable assembly, and has the ability of automatically disconnecting the current, thus effectively ensuring the functional requirements of power connection or disconnection of the input end and the output end.

Description

FIELD

[0001] The present disclosure generally relates to the electrical field, and in particular to a releasing device used in a leakage protection device and a leakage protection device including the releasing device.BACKGROUND

[0002] In order to improve the safety of electricity consumption, leakage protection device is used more and more widely, and the application fields and scenarios of the leakage protection device are also increasing. The core structure in the existing leakage protection device occupies a large proportion in the internal space of the leakage protection device, which makes it difficult to add other additional functions to the leakage protection device, resulting in the disharmony of the overall appearance of the product and reducing the overall aesthetics of the product. At present, more and more leakage protection devices in the market tend to be miniaturized, but the simple principle of the leakage protection device leads to weak disconnecting ability. When short-circuit current occurs, it is easy to cause current contacts to be stuck and fail to be disconnected, which brings great security risks. Moreover, the existing products with strong disconnecting ability mostly adopt the manner that the contacts are normally closed, which is difficult to assemble and not easy to process.SUMMARY

[0003] The purpose of the present disclosure is to solve the above-mentioned problems existing in the prior art, and propose a releasing device, which realizes a reset function and / or a releasing function required by the leakage protection device through fewer parts and compact structural design, thereby reducing the volume of the leakage protection device, especially improving the capability of disconnecting the current, and has the characteristics of simple structure, easy assembly, high reliability and the like.

[0004] Therefore, according to one aspect of the present disclosure, a releasing device for providing leakage protection is provided. The releasing device comprises a control circuit board; a coil assembly coupled with the control circuit board and at least comprising a coil bracket and a static electrical contact attached to the coil bracket; a movable assembly attached with a movable contact arm, and the movable contact arm being provided with a movable electrical contact corresponding to the static electrical contact; wherein the movable assembly is configured to be capable of reciprocating relative to the coil assembly between a first position, in which the movable electrical contact and the static electrical contact are disconnected to be in a disconnected state, and a second position, in which the movable contact arm is driven by the movable assembly to elastically deform so that the movable electrical contact is in contact with the static electrical contact to be in a closed state.

[0005] According to the above technical concept, the present disclosure may further include any one or more of the following alternative forms.

[0006] In some alternative forms, the movable assembly is provided with a closing limiting portion, and the closing limiting portion is configured to drive the movable contact arm to elastically deform during the movement of the movable assembly from the first position to the second position, so that the movable electrical contact and the static electrical contact are in the closed state.

[0007] In some alternative forms, the movable assembly is further provided with a disconnecting limiting portion, and the disconnecting limiting portion is configured to drive the movable contact arm to elastically deform during the movement of the movable assembly from the second position to the first position, so that the movable electrical contact and the static electrical contact are in the disconnected state.

[0008] In some alternative forms, the closing limiting portion and the disconnecting limiting portion are arranged oppositely, and the movable contact arm is arranged in a limiting groove between the closing limiting portion and the disconnecting limiting portion.

[0009] In some alternative forms, the movable contact arm is configured to comprise a fixed section coupled with the control circuit board and a movable section to be closed or disconnected from the static electrical contact, and an inclined connecting section is arranged between the fixed section and the movable section, and wherein the connecting section is arranged in the limiting groove.

[0010] In some alternative forms, the closing limiting portion and the disconnecting limiting portion are respectively provided with convex surfaces protruding toward each other.

[0011] In some alternative forms, the releasing device comprises a pair of movable contact arms, and the movable assembly comprises a pair of symmetrically arranged limiting arms, each limiting arm is respectively provided with the closing limiting portion and the disconnecting limiting portion, and each movable contact arm is respectively arranged in the limiting groove between the corresponding closing limiting portion and the disconnecting limiting portion; and wherein the releasing device comprises a pair of static electrical contacts, and each static electrical contact corresponds to the movable electrical contact of each movable contact arm respectively.

[0012] In some alternative forms, the coil assembly further comprises an electromagnetic coil and an iron core, the electromagnetic coil is sleeved outside the coil bracket, and the iron core is arranged in the coil bracket and is capable of reciprocating between a direction toward the movable assembly and a direction away from the movable assembly.

[0013] In some alternative forms, the releasing device further comprises a reset spring arranged between the coil bracket and the iron core to provide a reset force for resetting the iron core in the direction away from the movable assembly.

[0014] In some alternative forms, the movable assembly is provided with a hollow portion, and a permanent magnet is fixedly arranged in the hollow portion for attracting to the iron core.

[0015] In some alternative forms, when the movable assembly is in the second position, the magnetic attractive force of the permanent magnet to the iron core is greater than the reset force of the reset spring.

[0016] In some alternative forms, the polarity of the magnetic field on the side of the permanent magnet facing the iron core is configured to be the same as the polarity of the magnetic field generated on the side of the iron core facing the permanent magnet after the electromagnetic coil is energized.

[0017] In some alternative forms, the movable assembly is made of insulating material.

[0018] In some alternative forms, the releasing device further comprises a reset button arranged adjacent to the coil assembly and configured to drive the iron core of the coil assembly to move toward the movable assembly.

[0019] In some alternative forms, the releasing device further comprises a transformer bracket, a current transformer coupled with the control circuit board is arranged on the transformer bracket, and the movable contact arm is fixedly arranged on the transformer bracket.

[0020] According to another aspect of the present disclosure, a leakage protection device is provided, which comprises a releasing device mentioned above.

[0021] The releasing device disclosed by the present disclosure realizes the reset function and the releasing function in the leakage protection device through the cooperative action of the coil assembly and the movable assembly, and has the ability of automatically disconnecting the current, thus effectively ensuring the functional requirements of power connection or disconnection at the input end and the output end, reducing the number of parts, greatly reducing the product volume and reducing the assembly cost. The releasing device disclosed by the present disclosure is simple in structure, convenient to implement, suitable for automatic production and applicable to various forms of the leakage protection devices.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features and advantages of the present disclosure will be better understood by the following alternative embodiments described in detail in conjunction with the accompanying drawings, in the drawings: Fig. 1 is an external schematic view of a releasing device according to an embodiment of the present disclosure; Fig. 2 is an exploded schematic view of the releasing device in Fig. 1; Fig. 3 is a schematic view of a movable assembly of the releasing device in Fig. 1; Fig. 4 is a schematic sectional view of the movable assembly in the releasing device in a first position; Fig. 5 is a schematic sectional view when a reset button of the releasing device is pressed; Fig. 6 is a schematic sectional view of the releasing device when the movable assembly is in a second position and the reset button and a reset spring tend to be reset; Fig. 7 is a schematic sectional view of a movable electrical contact and a static electrical contact which are stuck and would be disconnected by the movable assembly. DETAILED DESCRIPTION OF EMBODIMENTS

[0023] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed merely exemplify the specific ways of implementing and using the present disclosure, and do not limit the scope of the present disclosure. When describing the structural positions of various components, such as the directions of upper, lower, top, bottom, etc., the description is not absolute, but relative. When the various components are arranged as shown in the figures, these directional expressions are appropriate, but when the positions of the various components in the figures would be changed, these directional expressions would also be changed accordingly.

[0024] In this context, the terms "couple", "attach" and "connect" should be understood broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "couple" or "attach" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skilled in the art, the specific meanings of the above terms in this context can be understood according to specific situations.

[0025] In this context, the terms "first", "second" and so on are not used to limit the sequence and the number of components unless otherwise specified.

[0026] The core unit in the existing leakage protection device integrates most parts that provide leakage protection function, including but not limited to the reset function and the releasing function. With the development of the automation industry and the diversification of application occasions, the design of the core unit tends to be modular and miniaturized. It has been realized that the miniaturized core unit has weak disconnecting ability because of its simple principle, and it is easy to cause the current contacts to be stuck and fail to be disconneted when short-circuit current occurs, which brings great security risks. Moreover, the existing products with strong disconnecting ability mostly adopt the manner that the contacts are normally closed, which is difficult to assemble and not easy to process.

[0027] Based on this, the present disclosure provides a releasing device for the leakage protection device, which is based on miniaturization design and has the ability of automatically disconnecting the current. It should be understood that the leakage protection devices applicable to the releasing device of the present disclosure include, but are not limited to, plugs or sockets.

[0028] Referring to Fig. 1 and Fig. 2, a releasing device according to an embodiment of the present disclosure mainly includes a control circuit board 10, a coil assembly 20 and a movable assembly 30, wherein the coil assembly 20 is coupled with the control circuit board 10 and at least includes a coil bracket 21 and an static electrical contact 60 attached to the coil bracket. For example, the coil bracket may be provided with a positioning groove 25 for the static electrical contact 60 to be embedded. The movable assembly 30 is attached with a movable contact arm 50 wihch is provided with a movable electrical contact 52 corresponding to the static electrical contact. In some embodiments, the releasing device further comprises a transformer bracket 70, and a current transformer coupled with the control circuit board is arranged on the transformer bracket 70. The current transformer is used for sensing leakage current and outputting a signal to a control circuit on the control circuit board 10. The movable contact arm 50 is fixed on the transformer bracket 70. For example, the transformer bracket 70 can be provided with a slot 71 for the movable contact arm 50 to be embedded. In some embodiments, the releasing device further includes a reset button 80, which is arranged adjacent to the coil assembly 20 and configured to drive the movable assembly 30 to move via the coil assembly 20. Advantageously, the components are assembled as a whole in a compact manner, and then can be conveniently assembled to a housing of the leakage protection device. In this way, the releasing device can be assembled with different forms of the housing or other additional components based on different requirements, thus being suitable for automatic batch production of the leakage protection devices in various occasions.

[0029] It should be understood that the static electrical contact 60 attached to the coil bracket and the movable contact arm 50 fixed on the transformer bracket 70 and attached to the movable assembly 30 are input component and output component respectively, and are not limited here.

[0030] According to the present disclosure, the movable assembly 30 is configured to be capable of reciprocating relative to the coil assembly 20 between a first position, in which the movable electrical contact 52 and the static electrical contact 60 are disconnected to be in a disconnented state, and a second position, in which the movable contact arm 50 is driven by the movable assembly 30 to elastically deform so that the movable electrical contact 52 is in contact with the static electrical contact 60 to be in a closed state. In other words, when the movable assembly 30 is moved to the first position by a force in a specific direction and magnitude, the input component and the output component are correspondingly driven to be close to each other and in the closed state, thereby realizing the power communication between the input end and the output end; on the contrary, when the movable assembly 30 moves to the second position, the input component and the output component are driven away from each other and in the disconnected state, so as to realize the power disconnection between the input end and the output end.

[0031] For the coil assembly 20, in combination with Figs. 2 and 4, the coil assembly 20 further includes an electromagnetic coil 22 and an iron core 23, wherein the electromagnetic coil 22 is sleeved outside the coil bracket 21, and the iron core 23 is arranged in the coil bracket 21 and is capable of reciprocating between a direction toward the movable assembly 30 and a direction away from the movable assembly 30. This reciprocating movement can be realized, for example, by the reset button 80 and providing a reset spring 24, and the reset spring 24 is arranged between the coil bracket 21 and the iron core 23. As shown in Fig. 4, one end of the coil bracket 21 can be provided with a hollow winding post 212, and the electromagnetic coil 22 is sleeved outside the winding post 212, while the iron core 23 is placed in the hollow cavity of the winding post 212, and the reset spring 24 is sleeved outside the iron core 23. Specifically, the iron core 23 has a head end 231 and a tail end 232. The head end 231 is provided with an outer flange 234 which abuts against one end of the reset spring 24, and an inner flange 211 which abuts against the other end of the reset spring 24 can be provided in the hollow cavity of the winding post 212 of the coil bracket 21, that is, the reset spring 24 is confined between the outer flange 234 of the iron core 23 and the inner flange 211 of the winding post 212. In this way, when the reset button 80 is pressed, the iron core 23 can be moved toward the movable assembly 30, and when the reset button 80 is released, the reset spring 24 provides the reset force to reset the iron core 23 away from the movable assembly 30.

[0032] The present disclosure advantageously sleeves the movable assembly 30 on the other end of the coil bracket 21, and enables the movable assembly 30 to move back and forth between the first position and the second position within a specific distance along the axial direction of the winding post 212, thereby driving the movable contact arm 50 to move to contact or disconnect with the static electrical contact 60.

[0033] Referring specifically to Fig. 3, in some embodiments, the movable assembly 30 is provided with a closing limiting portion 31, which is configured to drive the movable contact arm 50 to elastically deform so that the movable electrical contact 52 and the static electrical contact 60 are in the closed state during the movement of the movable assembly 30 from the first position to the second position. Advantageously, the movable assembly 30 is further provided with a disconnecting limiting portion 32, which is configured to drive the movable contact arm 50 to elastically deform so that the movable electrical contact 52 and the static electrical contact 60 are in the disconnected state during the movement of the movable assembly 30 from the second position to the first position. In the illustrated embodiment, the closing limiting portion 31 and the disconnecting limiting portion 32 are arranged oppositely, and the movable contact arm 50 can be arranged in a limiting groove 33 between the closing limiting portion 31 and the disconnecting limiting portion 32. In this way, the movable contact arm 50 can make elastic swinging motion with the reciprocating movement of the movable assembly 30 under the action of the closing limiting portion 31 and the disconnecting limiting portion 32, so as to realize the closing and disconnecting of the movable electrical contact and the static electrical contact in a small space, and effectively ensure the relatively stable closed state and disconnected state between the input component and the output component. Advantageously, the movable assembly 30 is made of insulating material, so as not to affect the power state between the input component and the output component

[0034] In some embodiments, the closing limiting portion 31 and the disconnecting limiting portion 32 may be respectively provided with convex surfaces protruding toward each other, so as to facilitate the driving of the movable contact arm 50 during the movement.

[0035] In some embodiments, combined with Figs. 2 and 4, the movable contact arm 50 can be configured to include a fixed section 53 coupled with the control circuit board 10 and a movable section 54 to be closed or disconnected from the static electrical contact 60, wherein an inclined connecting section 51 is arranged between the fixed section 53 and the movable section 54, and the connecting section 51 is arranged in the limiting groove 33. Accordingly, the limiting groove 33 may be configured to be inclined with respect to the movable direction of the movable assembly. In this way, it further facilitates the elastic swinging motion of the movable contact arm 50.

[0036] Advantageously, the releasing device comprises a pair of movable contact arms 50, and the movable assembly 30 comprises a pair of symmetrically arranged limiting arms 34, wherein each limiting arm 34 is respectively provided with the closing limiting portion 31 and the disconnecting limiting portion 32, and each movable contact arm 50 is respectively arranged in the limiting groove 33 between the corresponding closing limiting portion 31 and the disconnecting limiting portion 32. Accordingly, the releasing device includes a pair of static electrical contacts 60, and each static electrical contact corresponds to the movable electrical contact 52 of each movable contact arm 50 respectively.

[0037] The movement of the movable assembly 30 between the first position and the second position can be realized by magnetic attraction between the coil assembly 20 and the movable assembly 30, for example. Specifically, the movable assembly 30 can be provided with a hollow portion 35, and a permanent magnet 40 is fixedly arranged in the hollow portion 35. When the movable assembly 30 and the coil assembly 20 are at a certain distance, they can be combined together through the magnetic attraction between the iron core 23 and the permanent magnet 40, and then the movable assembly 30 is driven to move through the movement of the coil assembly 20. Specifically, the movable assembly 30 is driven to move from the first position to the second position, so as to realize the closing of the movable electrical contact and the static electrical contact. Advantageously, when the movable assembly 30 is in the second position, the magnetic attractive force of the permanent magnet 40 to the iron core 23 is greater than the reset force of the reset spring 24.

[0038] In some embodiments, the polarity of the magnetic field on the side of the permanent magnet 40 facing the iron core 23 is configured to be the same as the polarity of the magnetic field generated on the side of the iron core 23 facing the permanent magnet 40 after the electromagnetic coil 22 is energized. That is to say, when the electromagnetic coil 22 is energized, the magnetic pole of the tail end 232 of the iron core 23 facing the permanent magnet 40 and the magnetic pole of the corresponding side of the permanent magnet 40 repel each other, and then the movable assembly 30 can be driven to move from the second position to the first position through the mutual repulsion between the iron core 23 and the permanent magnet 40, so as to realize the disconnection of the movable electrical contact and the static electrical contact.

[0039] The working principle and operation process of the releasing device of the present disclosure are described below with reference to Figs. 5 to 7. Fig. 5 illustrates the disconnected state or releasing state of the movable electrical contact and the static electrical contact, when the movable assembly 30 is in the first position, which can also be called initial position. Fig. 6 illustrates the closed state or reset state of the movable electrical contact and the static electrical contact, when the movable assembly 30 is in the second position. Fig. 7 illustrates a state in which the movable electrical contact and the static electrical contact are disconnected by the disconnecting limiting portion 32 of the movable assembly 30 when the movable electrical contact and the static electrical contact cannot be disconnected.

[0040] First of all, referring to Fig. 5, under the action of the reset spring 24, the coil assembly 20 and the movable assembly 30 in the initial state of the releasing device are kept away from each other, the movable assembly 30 is in the first position, the inclined connecting section 51 of the movable contact arm 50 abuts against the closing limiting portion 31 of the movable assembly 30, and the movable electrical contact 52 and the static electrical contact 60 are in the disconnected state, so that the power between the input end and the output end is disconnected. When the reset button 80 is pressed as shown by the arrow, the reset button 80 pushes the iron core 23 to move downward and compresses the reset spring 24. When the iron core 23 is close enough to the permanent magnet 40 in the movable assembly 30, the tail end of the iron core 23 is attracted to the permanent magnet 40. At this time, referring to Fig. 6, if the reset button 80 is released as shown by the arrow, the iron core 23 and the permanent magnet 40 or the movable assembly 30 attracted to the iron core will move upward under the reset force of the reset spring 24, that is, move toward the second position of the movable assembly. During the movement process, the closing limiting portion 31 of the movable assembly 30 drives the connecting section 51 of the movable contact arm 50 abutting against the movable assembly to make elastic swinging motion until the movable electrical contact 52 contacts and closes to the static electrical contact 60. At this time, as mentioned above, in the second position of the movable assembly 30, that is, in the closed state of the movable electrical contact 52 and the static electrical contact 60, the magnetic attractive force of the permanent magnet 40 to the iron core 23 is greater than the reset force of the reset spring 24, and the permanent magnet 40 and the iron core 23 will not be separated, thus effectively ensuring the power communication between the input end and the output end.

[0041] When the movable assembly 30 is in the second position shown in Fig. 6, if the electromagnetic coil 22 is energized to generate a magnetic field in a specific direction, and then the tail end of the iron core 23 has a magnetic field with the same polarity as the attraction surface of the permanent magnet 40. As mentioned above, the polarity of the magnetic field on the side of the permanent magnet 40 facing the iron core 23 is configured to be the same as the polarity of the magnetic field generated on the side of the iron core 23 facing the permanent magnet 40 after the electromagnetic coil 22 is energized. Due to the mutual repulsion effect of magnets with the same polarity, the permanent magnet 40 drives the movable assembly 30 to move away from the iron core 23, the movable contact arm 50 loses the resisting force provided by the closing limiting portion 31 at the same time, and the movable electrical contact 52 is separated from the static electrical contact 60 under the action of the resilient force of the movable contact arm 50 itself, and the movable assembly 30 returns to the initial first position shown in Fig. 5, thus realizing the automatic disconnection of the movable electrical contact 52 and the static electrical contact 60.

[0042] In some occasions, during the movement of the movable assembly 30 from the second position to the first position, the movable electrical contact 52 and the static electrical contact 60 are stuck together for some special reasons and cannot be disconnected quickly, and also due to the repulsive force of the same polarity of the magnetic field of the iron core 23 and the permanent magnet 40, the movable assembly 30 will drive the movable electrical contact 52 to separate from the static electrical contact 60 through the abutment and contact between the disconnecting limiting portion 32 and the connecting section 51 of the movable contact arm 50 during the downward movement, so as to disconnect the power between the input end and the output end, ensure the movable assembly 30 to return to the initial first position shown in Fig. 5, and also realize the automatic disconnection of the movable electrical contact 52 and the static electrical contact 60.

[0043] The releasing device disclosed by the present disclosure effectively realizes the leakage protection functions of resetting and releasing with fewer parts and compact layout, has the ability of automatically disconnecting the current, effectively ensures the functional requirements of power connection or disconnection at the input end and the output end. The releasing device is simple to operate and is miniaturized in overall shape, and can be widely used as a modular product in various forms of the leakage protection devices.

[0044] It should be understood here that the embodiments shown in the drawings only illustrate the optional shapes, sizes and arrangements of the releasing device of the leakage protection device according to the present disclosure; however, it is only illustrative rather than restrictive, and other shapes, sizes and arrangements can be adopted without departing from the spirit and scope of the present disclosure.

[0045] The technical content and technical features of the present disclosure have been disclosed above. However, it can be understood that those skilled in the art can make various changes and improvements to the above disclosed concept under the creative idea of the present disclosure, all of which fall within the protection scope of the present disclosure. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present disclosure is determined by the claims.

Examples

Embodiment Construction

[0023]The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed merely exemplify the specific ways of implementing and using the present disclosure, and do not limit the scope of the present disclosure. When describing the structural positions of various components, such as the directions of upper, lower, top, bottom, etc., the description is not absolute, but relative. When the various components are arranged as shown in the figures, these directional expressions are appropriate, but when the positions of the various components in the figures would be changed, these directional expressions would also be changed accordingly.

[0024]In this context, the terms "couple", "attach" and "connect" should be understood broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "couple" or "attach" can be a direct connection or an indirect connection t...

FIELD

[0001] The present disclosure generally relates to the electrical field, and in particular to a releasing device used in a leakage protection device and a leakage protection device including the releasing device.BACKGROUND

[0002] In order to improve the safety of electricity consumption, leakage protection device is used more and more widely, and the application fields and scenarios of the leakage protection device are also increasing. The core structure in the existing leakage protection device occupies a large proportion in the internal space of the leakage protection device, which makes it difficult to add other additional functions to the leakage protection device, resulting in the disharmony of the overall appearance of the product and reducing the overall aesthetics of the product. At present, more and more leakage protection devices in the market tend to be miniaturized, but the simple principle of the leakage protection device leads to weak disconnecting ability. When short-circuit current occurs, it is easy to cause current contacts to be stuck and fail to be disconnected, which brings great security risks. Moreover, the existing products with strong disconnecting ability mostly adopt the manner that the contacts are normally closed, which is difficult to assemble and not easy to process.SUMMARY

[0003] The purpose of the present disclosure is to solve the above-mentioned problems existing in the prior art, and propose a releasing device, which realizes a reset function and / or a releasing function required by the leakage protection device through fewer parts and compact structural design, thereby reducing the volume of the leakage protection device, especially improving the capability of disconnecting the current, and has the characteristics of simple structure, easy assembly, high reliability and the like.

[0004] Therefore, according to one aspect of the present disclosure, a releasing device for providing leakage protection is provided. The releasing device comprises a control circuit board; a coil assembly coupled with the control circuit board and at least comprising a coil bracket and a static electrical contact attached to the coil bracket; a movable assembly attached with a movable contact arm, and the movable contact arm being provided with a movable electrical contact corresponding to the static electrical contact; wherein the movable assembly is configured to be capable of reciprocating relative to the coil assembly between a first position, in which the movable electrical contact and the static electrical contact are disconnected to be in a disconnected state, and a second position, in which the movable contact arm is driven by the movable assembly to elastically deform so that the movable electrical contact is in contact with the static electrical contact to be in a closed state.

[0005] According to the above technical concept, the present disclosure may further include any one or more of the following alternative forms.

[0006] In some alternative forms, the movable assembly is provided with a closing limiting portion, and the closing limiting portion is configured to drive the movable contact arm to elastically deform during the movement of the movable assembly from the first position to the second position, so that the movable electrical contact and the static electrical contact are in the closed state.

[0007] In some alternative forms, the movable assembly is further provided with a disconnecting limiting portion, and the disconnecting limiting portion is configured to drive the movable contact arm to elastically deform during the movement of the movable assembly from the second position to the first position, so that the movable electrical contact and the static electrical contact are in the disconnected state.

[0008] In some alternative forms, the closing limiting portion and the disconnecting limiting portion are arranged oppositely, and the movable contact arm is arranged in a limiting groove between the closing limiting portion and the disconnecting limiting portion.

[0009] In some alternative forms, the movable contact arm is configured to comprise a fixed section coupled with the control circuit board and a movable section to be closed or disconnected from the static electrical contact, and an inclined connecting section is arranged between the fixed section and the movable section, and wherein the connecting section is arranged in the limiting groove.

[0010] In some alternative forms, the closing limiting portion and the disconnecting limiting portion are respectively provided with convex surfaces protruding toward each other.

[0011] In some alternative forms, the releasing device comprises a pair of movable contact arms, and the movable assembly comprises a pair of symmetrically arranged limiting arms, each limiting arm is respectively provided with the closing limiting portion and the disconnecting limiting portion, and each movable contact arm is respectively arranged in the limiting groove between the corresponding closing limiting portion and the disconnecting limiting portion; and wherein the releasing device comprises a pair of static electrical contacts, and each static electrical contact corresponds to the movable electrical contact of each movable contact arm respectively.

[0012] In some alternative forms, the coil assembly further comprises an electromagnetic coil and an iron core, the electromagnetic coil is sleeved outside the coil bracket, and the iron core is arranged in the coil bracket and is capable of reciprocating between a direction toward the movable assembly and a direction away from the movable assembly.

[0013] In some alternative forms, the releasing device further comprises a reset spring arranged between the coil bracket and the iron core to provide a reset force for resetting the iron core in the direction away from the movable assembly.

[0014] In some alternative forms, the movable assembly is provided with a hollow portion, and a permanent magnet is fixedly arranged in the hollow portion for attracting to the iron core.

[0015] In some alternative forms, when the movable assembly is in the second position, the magnetic attractive force of the permanent magnet to the iron core is greater than the reset force of the reset spring.

[0016] In some alternative forms, the polarity of the magnetic field on the side of the permanent magnet facing the iron core is configured to be the same as the polarity of the magnetic field generated on the side of the iron core facing the permanent magnet after the electromagnetic coil is energized.

[0017] In some alternative forms, the movable assembly is made of insulating material.

[0018] In some alternative forms, the releasing device further comprises a reset button arranged adjacent to the coil assembly and configured to drive the iron core of the coil assembly to move toward the movable assembly.

[0019] In some alternative forms, the releasing device further comprises a transformer bracket, a current transformer coupled with the control circuit board is arranged on the transformer bracket, and the movable contact arm is fixedly arranged on the transformer bracket.

[0020] According to another aspect of the present disclosure, a leakage protection device is provided, which comprises a releasing device mentioned above.

[0021] The releasing device disclosed by the present disclosure realizes the reset function and the releasing function in the leakage protection device through the cooperative action of the coil assembly and the movable assembly, and has the ability of automatically disconnecting the current, thus effectively ensuring the functional requirements of power connection or disconnection at the input end and the output end, reducing the number of parts, greatly reducing the product volume and reducing the assembly cost. The releasing device disclosed by the present disclosure is simple in structure, convenient to implement, suitable for automatic production and applicable to various forms of the leakage protection devices.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features and advantages of the present disclosure will be better understood by the following alternative embodiments described in detail in conjunction with the accompanying drawings, in the drawings: Fig. 1 is an external schematic view of a releasing device according to an embodiment of the present disclosure; Fig. 2 is an exploded schematic view of the releasing device in Fig. 1; Fig. 3 is a schematic view of a movable assembly of the releasing device in Fig. 1; Fig. 4 is a schematic sectional view of the movable assembly in the releasing device in a first position; Fig. 5 is a schematic sectional view when a reset button of the releasing device is pressed; Fig. 6 is a schematic sectional view of the releasing device when the movable assembly is in a second position and the reset button and a reset spring tend to be reset; Fig. 7 is a schematic sectional view of a movable electrical contact and a static electrical contact which are stuck and would be disconnected by the movable assembly. DETAILED DESCRIPTION OF EMBODIMENTS

[0023] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed merely exemplify the specific ways of implementing and using the present disclosure, and do not limit the scope of the present disclosure. When describing the structural positions of various components, such as the directions of upper, lower, top, bottom, etc., the description is not absolute, but relative. When the various components are arranged as shown in the figures, these directional expressions are appropriate, but when the positions of the various components in the figures would be changed, these directional expressions would also be changed accordingly.

[0024] In this context, the terms "couple", "attach" and "connect" should be understood broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "couple" or "attach" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skilled in the art, the specific meanings of the above terms in this context can be understood according to specific situations.

[0025] In this context, the terms "first", "second" and so on are not used to limit the sequence and the number of components unless otherwise specified.

[0026] The core unit in the existing leakage protection device integrates most parts that provide leakage protection function, including but not limited to the reset function and the releasing function. With the development of the automation industry and the diversification of application occasions, the design of the core unit tends to be modular and miniaturized. It has been realized that the miniaturized core unit has weak disconnecting ability because of its simple principle, and it is easy to cause the current contacts to be stuck and fail to be disconneted when short-circuit current occurs, which brings great security risks. Moreover, the existing products with strong disconnecting ability mostly adopt the manner that the contacts are normally closed, which is difficult to assemble and not easy to process.

[0027] Based on this, the present disclosure provides a releasing device for the leakage protection device, which is based on miniaturization design and has the ability of automatically disconnecting the current. It should be understood that the leakage protection devices applicable to the releasing device of the present disclosure include, but are not limited to, plugs or sockets.

[0028] Referring to Fig. 1 and Fig. 2, a releasing device according to an embodiment of the present disclosure mainly includes a control circuit board 10, a coil assembly 20 and a movable assembly 30, wherein the coil assembly 20 is coupled with the control circuit board 10 and at least includes a coil bracket 21 and an static electrical contact 60 attached to the coil bracket. For example, the coil bracket may be provided with a positioning groove 25 for the static electrical contact 60 to be embedded. The movable assembly 30 is attached with a movable contact arm 50 wihch is provided with a movable electrical contact 52 corresponding to the static electrical contact. In some embodiments, the releasing device further comprises a transformer bracket 70, and a current transformer coupled with the control circuit board is arranged on the transformer bracket 70. The current transformer is used for sensing leakage current and outputting a signal to a control circuit on the control circuit board 10. The movable contact arm 50 is fixed on the transformer bracket 70. For example, the transformer bracket 70 can be provided with a slot 71 for the movable contact arm 50 to be embedded. In some embodiments, the releasing device further includes a reset button 80, which is arranged adjacent to the coil assembly 20 and configured to drive the movable assembly 30 to move via the coil assembly 20. Advantageously, the components are assembled as a whole in a compact manner, and then can be conveniently assembled to a housing of the leakage protection device. In this way, the releasing device can be assembled with different forms of the housing or other additional components based on different requirements, thus being suitable for automatic batch production of the leakage protection devices in various occasions.

[0029] It should be understood that the static electrical contact 60 attached to the coil bracket and the movable contact arm 50 fixed on the transformer bracket 70 and attached to the movable assembly 30 are input component and output component respectively, and are not limited here.

[0030] According to the present disclosure, the movable assembly 30 is configured to be capable of reciprocating relative to the coil assembly 20 between a first position, in which the movable electrical contact 52 and the static electrical contact 60 are disconnected to be in a disconnented state, and a second position, in which the movable contact arm 50 is driven by the movable assembly 30 to elastically deform so that the movable electrical contact 52 is in contact with the static electrical contact 60 to be in a closed state. In other words, when the movable assembly 30 is moved to the first position by a force in a specific direction and magnitude, the input component and the output component are correspondingly driven to be close to each other and in the closed state, thereby realizing the power communication between the input end and the output end; on the contrary, when the movable assembly 30 moves to the second position, the input component and the output component are driven away from each other and in the disconnected state, so as to realize the power disconnection between the input end and the output end.

[0031] For the coil assembly 20, in combination with Figs. 2 and 4, the coil assembly 20 further includes an electromagnetic coil 22 and an iron core 23, wherein the electromagnetic coil 22 is sleeved outside the coil bracket 21, and the iron core 23 is arranged in the coil bracket 21 and is capable of reciprocating between a direction toward the movable assembly 30 and a direction away from the movable assembly 30. This reciprocating movement can be realized, for example, by the reset button 80 and providing a reset spring 24, and the reset spring 24 is arranged between the coil bracket 21 and the iron core 23. As shown in Fig. 4, one end of the coil bracket 21 can be provided with a hollow winding post 212, and the electromagnetic coil 22 is sleeved outside the winding post 212, while the iron core 23 is placed in the hollow cavity of the winding post 212, and the reset spring 24 is sleeved outside the iron core 23. Specifically, the iron core 23 has a head end 231 and a tail end 232. The head end 231 is provided with an outer flange 234 which abuts against one end of the reset spring 24, and an inner flange 211 which abuts against the other end of the reset spring 24 can be provided in the hollow cavity of the winding post 212 of the coil bracket 21, that is, the reset spring 24 is confined between the outer flange 234 of the iron core 23 and the inner flange 211 of the winding post 212. In this way, when the reset button 80 is pressed, the iron core 23 can be moved toward the movable assembly 30, and when the reset button 80 is released, the reset spring 24 provides the reset force to reset the iron core 23 away from the movable assembly 30.

[0032] The present disclosure advantageously sleeves the movable assembly 30 on the other end of the coil bracket 21, and enables the movable assembly 30 to move back and forth between the first position and the second position within a specific distance along the axial direction of the winding post 212, thereby driving the movable contact arm 50 to move to contact or disconnect with the static electrical contact 60.

[0033] Referring specifically to Fig. 3, in some embodiments, the movable assembly 30 is provided with a closing limiting portion 31, which is configured to drive the movable contact arm 50 to elastically deform so that the movable electrical contact 52 and the static electrical contact 60 are in the closed state during the movement of the movable assembly 30 from the first position to the second position. Advantageously, the movable assembly 30 is further provided with a disconnecting limiting portion 32, which is configured to drive the movable contact arm 50 to elastically deform so that the movable electrical contact 52 and the static electrical contact 60 are in the disconnected state during the movement of the movable assembly 30 from the second position to the first position. In the illustrated embodiment, the closing limiting portion 31 and the disconnecting limiting portion 32 are arranged oppositely, and the movable contact arm 50 can be arranged in a limiting groove 33 between the closing limiting portion 31 and the disconnecting limiting portion 32. In this way, the movable contact arm 50 can make elastic swinging motion with the reciprocating movement of the movable assembly 30 under the action of the closing limiting portion 31 and the disconnecting limiting portion 32, so as to realize the closing and disconnecting of the movable electrical contact and the static electrical contact in a small space, and effectively ensure the relatively stable closed state and disconnected state between the input component and the output component. Advantageously, the movable assembly 30 is made of insulating material, so as not to affect the power state between the input component and the output component

[0034] In some embodiments, the closing limiting portion 31 and the disconnecting limiting portion 32 may be respectively provided with convex surfaces protruding toward each other, so as to facilitate the driving of the movable contact arm 50 during the movement.

[0035] In some embodiments, combined with Figs. 2 and 4, the movable contact arm 50 can be configured to include a fixed section 53 coupled with the control circuit board 10 and a movable section 54 to be closed or disconnected from the static electrical contact 60, wherein an inclined connecting section 51 is arranged between the fixed section 53 and the movable section 54, and the connecting section 51 is arranged in the limiting groove 33. Accordingly, the limiting groove 33 may be configured to be inclined with respect to the movable direction of the movable assembly. In this way, it further facilitates the elastic swinging motion of the movable contact arm 50.

[0036] Advantageously, the releasing device comprises a pair of movable contact arms 50, and the movable assembly 30 comprises a pair of symmetrically arranged limiting arms 34, wherein each limiting arm 34 is respectively provided with the closing limiting portion 31 and the disconnecting limiting portion 32, and each movable contact arm 50 is respectively arranged in the limiting groove 33 between the corresponding closing limiting portion 31 and the disconnecting limiting portion 32. Accordingly, the releasing device includes a pair of static electrical contacts 60, and each static electrical contact corresponds to the movable electrical contact 52 of each movable contact arm 50 respectively.

[0037] The movement of the movable assembly 30 between the first position and the second position can be realized by magnetic attraction between the coil assembly 20 and the movable assembly 30, for example. Specifically, the movable assembly 30 can be provided with a hollow portion 35, and a permanent magnet 40 is fixedly arranged in the hollow portion 35. When the movable assembly 30 and the coil assembly 20 are at a certain distance, they can be combined together through the magnetic attraction between the iron core 23 and the permanent magnet 40, and then the movable assembly 30 is driven to move through the movement of the coil assembly 20. Specifically, the movable assembly 30 is driven to move from the first position to the second position, so as to realize the closing of the movable electrical contact and the static electrical contact. Advantageously, when the movable assembly 30 is in the second position, the magnetic attractive force of the permanent magnet 40 to the iron core 23 is greater than the reset force of the reset spring 24.

[0038] In some embodiments, the polarity of the magnetic field on the side of the permanent magnet 40 facing the iron core 23 is configured to be the same as the polarity of the magnetic field generated on the side of the iron core 23 facing the permanent magnet 40 after the electromagnetic coil 22 is energized. That is to say, when the electromagnetic coil 22 is energized, the magnetic pole of the tail end 232 of the iron core 23 facing the permanent magnet 40 and the magnetic pole of the corresponding side of the permanent magnet 40 repel each other, and then the movable assembly 30 can be driven to move from the second position to the first position through the mutual repulsion between the iron core 23 and the permanent magnet 40, so as to realize the disconnection of the movable electrical contact and the static electrical contact.

[0039] The working principle and operation process of the releasing device of the present disclosure are described below with reference to Figs. 5 to 7. Fig. 5 illustrates the disconnected state or releasing state of the movable electrical contact and the static electrical contact, when the movable assembly 30 is in the first position, which can also be called initial position. Fig. 6 illustrates the closed state or reset state of the movable electrical contact and the static electrical contact, when the movable assembly 30 is in the second position. Fig. 7 illustrates a state in which the movable electrical contact and the static electrical contact are disconnected by the disconnecting limiting portion 32 of the movable assembly 30 when the movable electrical contact and the static electrical contact cannot be disconnected.

[0040] First of all, referring to Fig. 5, under the action of the reset spring 24, the coil assembly 20 and the movable assembly 30 in the initial state of the releasing device are kept away from each other, the movable assembly 30 is in the first position, the inclined connecting section 51 of the movable contact arm 50 abuts against the closing limiting portion 31 of the movable assembly 30, and the movable electrical contact 52 and the static electrical contact 60 are in the disconnected state, so that the power between the input end and the output end is disconnected. When the reset button 80 is pressed as shown by the arrow, the reset button 80 pushes the iron core 23 to move downward and compresses the reset spring 24. When the iron core 23 is close enough to the permanent magnet 40 in the movable assembly 30, the tail end of the iron core 23 is attracted to the permanent magnet 40. At this time, referring to Fig. 6, if the reset button 80 is released as shown by the arrow, the iron core 23 and the permanent magnet 40 or the movable assembly 30 attracted to the iron core will move upward under the reset force of the reset spring 24, that is, move toward the second position of the movable assembly. During the movement process, the closing limiting portion 31 of the movable assembly 30 drives the connecting section 51 of the movable contact arm 50 abutting against the movable assembly to make elastic swinging motion until the movable electrical contact 52 contacts and closes to the static electrical contact 60. At this time, as mentioned above, in the second position of the movable assembly 30, that is, in the closed state of the movable electrical contact 52 and the static electrical contact 60, the magnetic attractive force of the permanent magnet 40 to the iron core 23 is greater than the reset force of the reset spring 24, and the permanent magnet 40 and the iron core 23 will not be separated, thus effectively ensuring the power communication between the input end and the output end.

[0041] When the movable assembly 30 is in the second position shown in Fig. 6, if the electromagnetic coil 22 is energized to generate a magnetic field in a specific direction, and then the tail end of the iron core 23 has a magnetic field with the same polarity as the attraction surface of the permanent magnet 40. As mentioned above, the polarity of the magnetic field on the side of the permanent magnet 40 facing the iron core 23 is configured to be the same as the polarity of the magnetic field generated on the side of the iron core 23 facing the permanent magnet 40 after the electromagnetic coil 22 is energized. Due to the mutual repulsion effect of magnets with the same polarity, the permanent magnet 40 drives the movable assembly 30 to move away from the iron core 23, the movable contact arm 50 loses the resisting force provided by the closing limiting portion 31 at the same time, and the movable electrical contact 52 is separated from the static electrical contact 60 under the action of the resilient force of the movable contact arm 50 itself, and the movable assembly 30 returns to the initial first position shown in Fig. 5, thus realizing the automatic disconnection of the movable electrical contact 52 and the static electrical contact 60.

[0042] In some occasions, during the movement of the movable assembly 30 from the second position to the first position, the movable electrical contact 52 and the static electrical contact 60 are stuck together for some special reasons and cannot be disconnected quickly, and also due to the repulsive force of the same polarity of the magnetic field of the iron core 23 and the permanent magnet 40, the movable assembly 30 will drive the movable electrical contact 52 to separate from the static electrical contact 60 through the abutment and contact between the disconnecting limiting portion 32 and the connecting section 51 of the movable contact arm 50 during the downward movement, so as to disconnect the power between the input end and the output end, ensure the movable assembly 30 to return to the initial first position shown in Fig. 5, and also realize the automatic disconnection of the movable electrical contact 52 and the static electrical contact 60.

[0043] The releasing device disclosed by the present disclosure effectively realizes the leakage protection functions of resetting and releasing with fewer parts and compact layout, has the ability of automatically disconnecting the current, effectively ensures the functional requirements of power connection or disconnection at the input end and the output end. The releasing device is simple to operate and is miniaturized in overall shape, and can be widely used as a modular product in various forms of the leakage protection devices.

[0044] It should be understood here that the embodiments shown in the drawings only illustrate the optional shapes, sizes and arrangements of the releasing device of the leakage protection device according to the present disclosure; however, it is only illustrative rather than restrictive, and other shapes, sizes and arrangements can be adopted without departing from the spirit and scope of the present disclosure.

[0045] The technical content and technical features of the present disclosure have been disclosed above. However, it can be understood that those skilled in the art can make various changes and improvements to the above disclosed concept under the creative idea of the present disclosure, all of which fall within the protection scope of the present disclosure. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present disclosure is determined by the claims.

Examples

Embodiment Construction

[0023]The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed merely exemplify the specific ways of implementing and using the present disclosure, and do not limit the scope of the present disclosure. When describing the structural positions of various components, such as the directions of upper, lower, top, bottom, etc., the description is not absolute, but relative. When the various components are arranged as shown in the figures, these directional expressions are appropriate, but when the positions of the various components in the figures would be changed, these directional expressions would also be changed accordingly.

[0024]In this context, the terms "couple", "attach" and "connect" should be understood broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "couple" or "attach" can be a direct connection or an indirect connection t...

Claims

1. A releasing device for providing leakage protection, comprising: a control circuit board; a coil assembly coupled with the control circuit board and at least comprising a coil bracket and a static electrical contact attached to the coil bracket; a movable assembly attached with a movable contact arm, and the movable contact arm being provided with a movable electrical contact corresponding to the static electrical contact; wherein the movable assembly is configured to be capable of reciprocating relative to the coil assembly between a first position, in which the movable electrical contact and the static electrical contact are disconnected to be in a disconnected state, and a second position, in which the movable contact arm is driven by the movable assembly to elastically deform so that the movable electrical contact is in contact with the static electrical contact to be in a closed state.

2. The releasing device according to claim 1, wherein the movable assembly is provided with a closing limiting portion, and the closing limiting portion is configured to drive the movable contact arm to elastically deform during the movement of the movable assembly from the first position to the second position, so that the movable electrical contact and the static electrical contact are in the closed state.

3. The releasing device according to claim 2, wherein the movable assembly is further provided with a disconnecting limiting portion, and the disconnecting limiting portion is configured to drive the movable contact arm to elastically deform during the movement of the movable assembly from the second position to the first position, so that the movable electrical contact and the static electrical contact are in the disconnected state.

4. The releasing device according to claim 3, wherein the closing limiting portion and the disconnecting limiting portion are arranged oppositely, and the movable contact arm is arranged in a limiting groove between the closing limiting portion and the disconnecting limiting portion.

5. The releasing device according to claim 4, wherein the movable contact arm is configured to comprise a fixed section coupled with the control circuit board and a movable section to be closed or disconnected from the static electrical contact, and an inclined connecting section is arranged between the fixed section and the movable section, and wherein the connecting section is arranged in the limiting groove.

6. The releasing device according to claim 4, wherein the closing limiting portion and the disconnecting limiting portion are respectively provided with convex surfaces protruding toward each other.

7. The releasing device according to claim 4, wherein the releasing device comprises a pair of movable contact arms, and the movable assembly comprises a pair of symmetrically arranged limiting arms, each limiting arm is respectively provided with the closing limiting portion and the disconnecting limiting portion, and each movable contact arm is respectively arranged in the limiting groove between the corresponding closing limiting portion and the disconnecting limiting portion; and wherein the releasing device comprises a pair of static electrical contacts, and each static electrical contact corresponds to the movable electrical contact of each movable contact arm respectively.

8. The releasing device according to anyone of claims 1 to 7, wherein the coil assembly further comprises an electromagnetic coil and an iron core, the electromagnetic coil is sleeved outside the coil bracket, and the iron core is arranged in the coil bracket and is capable of reciprocating between a direction toward the movable assembly and a direction away from the movable assembly.

9. The releasing device according to claim 8, wherein the releasing device further comprises a reset spring arranged between the coil bracket and the iron core to provide a reset force for resetting the iron core in the direction away from the movable assembly.

10. The releasing device according to claim 9, wherein the movable assembly is provided with a hollow portion, and a permanent magnet is fixedly arranged in the hollow portion for attracting to the iron core.

11. The releasing device according to claim 10, wherein when the movable assembly is in the second position, the magnetic attractive force of the permanent magnet to the iron core is greater than the reset force of the reset spring.

12. The releasing device according to claim 10, wherein the polarity of the magnetic field on the side of the permanent magnet facing the iron core is configured to be the same as the polarity of the magnetic field generated on the side of the iron core facing the permanent magnet after the electromagnetic coil is energized.

13. The releasing device according to anyone of claims 1 to 7, wherein the movable assembly is made of insulating material.

14. The releasing device according to claim 8, wherein the releasing device further comprises a reset button arranged adjacent to the coil assembly and configured to drive the iron core of the coil assembly to move toward the movable assembly.

15. The releasing device according to anyone of claims 1 to 7, wherein the releasing device further comprises a transformer bracket, a current transformer coupled with the control circuit board is arranged on the transformer bracket, and the movable contact arm is fixedly arranged on the transformer bracket.

16. A leakage protection device, wherein the leakage protection device comprises a releasing device according to any one of claims 1 to 15.

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