CN218101144U - Leakage circuit breaker - Google Patents

Abstract

The embodiment of the application provides a residual current circuit breaker, and relates to the field of distribution equipment. The residual current circuit breaker comprises a shell, a test loop mechanism and a limiting structure. Wherein, the casing has the installation cavity. The test loop mechanism is installed in the installation cavity. The test loop mechanism comprises a test button and a test loop, and the test button is used for being stressed to conduct or break the test loop. The limiting structure is used for limiting the test button to protrude out of the shell. This application embodiment is through setting up limit structure in electric leakage circuit breaker for limit structure can restrict test button, makes test button not protrude in the casing, and in electric leakage circuit breaker use, it is touched and switched on test circuit to reduce test button by mistake, with the possibility of electric leakage circuit breaker separating brake, improves electric leakage circuit breaker's performance.

Description

Residual current circuit breaker

Technical Field

The application relates to the technical field of distribution equipment, in particular to a residual current circuit breaker.

Background

The earth leakage circuit breaker is a mechanical switch device which can close, bear and open current under normal circuit conditions, can close, bear and open current under abnormal circuit conditions within a specified time, and has an earth leakage protection function. The test loop mechanism is a mechanism which is arranged in the residual current circuit breaker and used for detecting whether the residual current protection function of the residual current circuit breaker is normal or not.

However, the conventional test circuit mechanism is easily turned on by being touched by mistake, and the residual current circuit breaker is easily opened in the normal use process of the residual current circuit breaker, so that the use performance of the residual current circuit breaker is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the embodiment of the present application provides an electrical leakage breaker, which alleviates the problem that the test loop mechanism is easily touched by mistake to open the electrical leakage breaker.

The embodiment of the application provides a residual current circuit breaker. This residual current circuit breaker includes: casing, test circuit mechanism and limit structure. The housing has a mounting cavity. The test loop mechanism is installed in the installation cavity. The test loop mechanism comprises a test button and a test loop, and the test button is used for being stressed to conduct or break the test loop. The limiting structure is used for limiting the test button to protrude out of the shell.

This application embodiment is through setting up limit structure in electric leakage circuit breaker for limit structure can restrict test button protrusion in casing, with in electric leakage circuit breaker use, reduces test button and is touched by mistake and switches on test circuit, with the possibility of electric leakage circuit breaker separating brake, improves electric leakage circuit breaker's performance.

In some embodiments, the limiting structure includes a first limiting member and a second limiting member that are engaged with each other. The first limiting part is arranged on the test button and does not protrude out of the shell. The second limiting piece is arranged on the shell. Along the action direction of the test button, at least part of the second limiting piece is opposite to the first limiting piece so as to be abutted against the first limiting piece to limit the test button when the test button is reset.

Through above-mentioned scheme, in the electric leakage circuit breaker use, second locating part on the casing can be through the first locating part on the butt test button and spacing test button, reduces test button protrusion casing and by the possibility that the mistake touched.

In some embodiments, the first retaining member is configured as a first retaining plate. The second stopper is configured as a second stopper plate. Along the action direction of the test button, at least part of the second limiting plate is opposite to the first limiting plate.

Through above-mentioned scheme, the second limiting plate can be through the first limiting plate of butt and spacing test button. In addition, when second limiting plate and first limiting plate looks butt, the butt area between the two is bigger, and the butt dynamics is stronger, can make the test button more be difficult for protruding casing.

In some embodiments, the first stop comprises a female spigot. The second limiting piece comprises a male spigot. At least a portion of the male tang opposes the female tang in the direction of actuation of the test button.

Through above-mentioned scheme, public tang can be through the spacing test button of butt female tang.

In some embodiments, the housing includes a first wall and a second wall with a non-zero included angle therebetween. The first limiting piece is arranged between the first wall and the second wall, and the second limiting piece is arranged on the first wall and/or the second wall.

Firstly, a non-zero included angle is arranged between the first wall and the second wall, and when the first limiting piece is arranged between the first wall and the second wall, the force application space can be increased, the size of the force application main body is not limited, and the force application of the first limiting piece is more convenient; secondly, a non-zero included angle is formed between the first wall and the second wall, the first limiting part is arranged between the first wall and the second wall, and when the second limiting part is arranged on the first wall and the second wall, the second limiting part can limit a plurality of parts of the first limiting part, so that the limiting force of the second limiting part on the first limiting part is favorably improved, and the test button is less prone to protruding out of the shell.

In some embodiments, the housing further comprises a first transition wall, a second transition wall connected between the first wall and the second wall. The first transition wall and the second transition wall are distributed on two sides of the first limiting piece to protect the first limiting piece.

Through the scheme, the first limiting piece can be coated by the first transition wall and the second transition wall along the connecting line direction of the first transition wall and the second transition wall, so that the first limiting piece is not easily touched by mistake in the connecting line direction of the first transition wall and the second transition wall. In addition, when the first limiting piece is covered by the first transition wall and the second transition wall, the first limiting piece is not easy to be damaged by factors such as impact of an external part.

In some embodiments, the circuit breaker further comprises a guide structure. The guide structure is arranged on the shell and/or the first limiting part and used for guiding the test button when the test button acts.

Through the scheme, the guide structure can improve the accuracy of the action of the test button and improve the service performance of the test loop mechanism. For example, in the process that the test button conducts the test loop, the guide structure can enable the test button to act towards the interior of the shell along a preset track, and the possibility that the test button presses against other components except the test loop is reduced; when the test button is disconnected from the test loop, the guide structure can enable the test button to move along a preset track in a direction away from the test loop, and the possibility that the test button is skewed and is blocked is reduced.

In some embodiments, the guiding structure includes a guiding protrusion and a guiding groove, the guiding protrusion is disposed on the housing, the guiding groove is disposed on the first limiting member, and at least a portion of the guiding protrusion is in contact fit with a groove wall of the groove.

Through above-mentioned scheme, the direction boss can realize the direction to first locating part with the cooperation of direction recess, and then realizes the direction to test button, improves the accuracy of test button action. In addition, through setting up guide structure into including direction boss and direction recess for guide structure is simpler, the manufacturing of the earth leakage circuit breaker of being more convenient for.

In some embodiments, the guide structure includes a guide channel disposed in the housing, and a portion of the test button is in contact engagement with a sidewall of the guide channel.

Through above-mentioned scheme, the direction passageway can with the test button cooperation, realize improving the accuracy of test button action to the direction of test button.

In some embodiments, the test circuit includes a movable contact and a stationary contact, the movable contact being adapted to contact or separate from the stationary contact upon actuation of the test button. The shell further comprises a first fixing groove, a first fixing block, a second fixing groove and a second fixing block, wherein the first fixing block is used for enabling at least part of the movable contact piece to be pressed in the first fixing groove, and the second fixing block is used for enabling at least part of the static contact piece to be pressed in the second fixing groove.

Through the scheme, the first fixing groove can limit the static contact piece to shake, vibrate or incline towards the direction vertical to the notch of the first fixing groove through the groove wall, and the first fixing block can limit the static contact piece to move or vibrate towards the notch of the first fixing groove; similarly, the second fixed slot can limit the moving contact piece to shake, vibrate or skew towards the direction perpendicular to the notch of the second fixed slot through the slot wall, and the second fixed block can limit the moving contact piece to move or vibrate towards the notch of the second fixed slot, so that the physical contact reliability and the electric connection stability of the moving contact piece and the static contact piece are improved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and in order that the technical means of the embodiments of the present application can be clearly understood, the embodiments of the present application are specifically described below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of a partial structure of an earth leakage breaker according to some embodiments of the present disclosure.

FIG. 2 is an exploded view of the housing, test loop mechanism and retaining structure in some embodiments of the present application.

Fig. 3 is a schematic view of a first position limiting structure according to some embodiments of the present disclosure.

Fig. 4 is a schematic view of a second position limiting structure in some embodiments of the present application.

Fig. 5 is a schematic view illustrating the first limiting member mounted on the housing according to some embodiments of the present disclosure.

FIG. 6 is a schematic view of a guide structure according to some embodiments of the present application.

FIG. 7 is a schematic view of the mounting of a test loop in some embodiments of the present application.

Description of reference numerals:

1. a housing; A. an upper housing; B. a lower housing; 11. a first wall; 12. a second wall; 13. a first transition wall; 14. a second transition wall; 15. a first fixing groove; 16. a first fixed block; 17. a second fixing groove; 18. a second fixed block; 2. a test loop mechanism; 21. a test button; 22. a test loop; 221. a movable contact spring; 222. a static contact sheet; 3. a limiting structure; 31. a first limit piece; 32. a second limit piece; 4. a guide structure; 41. a guide boss; 42. a guide groove; 43. a guide channel;

x, the first direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the drawings are intended to cover, but not to exclude, other elements. The word "a" or "an" does not exclude the presence of a plurality.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Furthermore, the terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, either explicitly or implicitly, including one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).

In the description of the present application, it is noted that the terms "mounted," "connected," and "connected" are to be construed broadly and mean, for example, that mechanical structures may be physically connected or "connected" unless expressly stated or limited otherwise. "connected" or "coupling" of circuit structures may mean not only physical coupling but also electrical or signal coupling, for example, direct coupling, i.e., physical coupling, or indirect coupling via at least one element therebetween, as long as electrical communication is achieved, or communication between the two elements; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

According to some embodiments of the present application, there is provided an electrical leakage breaker. Fig. 1 is a schematic view of a partial structure of a residual current circuit breaker according to some embodiments of the present disclosure. Fig. 2 is an exploded view of the housing 1, test loop mechanism 2 and retaining structure 3 in some embodiments of the present application. Fig. 3 is a schematic view of a first limiting structure 3 according to some embodiments of the present disclosure. Fig. 4 is a schematic view of a second limiting structure 3 according to some embodiments of the present disclosure. As shown in fig. 1 to 4, the electrical leakage breaker includes a case 1, a test circuit mechanism 2, and a stopper structure 3. The housing 1 has a mounting cavity. The test loop mechanism 2 is installed in the installation cavity. The test loop mechanism 2 comprises a test button 21 and a test loop 22, wherein the test button 21 is used for being forced to act so as to connect or disconnect the test loop 22. The limiting structure 3 is used for limiting the test button 21 from protruding out of the shell 1.

The housing 1 is a component for mounting the test circuit mechanism 2 or providing the limit structure 3. The shell 1 is provided with the test loop mechanism 2 through a mounting cavity, and the shape of the mounting cavity can be set according to the shape of the test loop mechanism 2. When the housing 1 is provided with the limiting structure 3, part of the limiting structure 3 may be provided. The housing 1 may be made of an insulating material (e.g., polyethylene) to insulate the inner test loop 22 from the outer conductive parts.

The test circuit mechanism 2 is a mechanism for detecting whether the leakage protection function of the leakage breaker is normal. During detection, the test loop mechanism 2 can be controlled to be switched on, whether the residual current circuit breaker is switched off or not can be observed, when the residual current circuit breaker is switched off, the leakage protection function is confirmed to be normal, and when the residual current circuit breaker is switched on, the leakage protection function is confirmed to be abnormal. This is because, in the earth leakage circuit breaker, the test circuit mechanism 2, the earth leakage protection circuit, and the earth leakage tripping mechanism are connected in sequence, and normally, when the test circuit mechanism 2 is turned on, a part of current in the main circuit of the earth leakage circuit breaker flows into the test circuit mechanism 2, and at this time, the earth leakage protection circuit confirms that the main circuit of the earth leakage circuit breaker has an earth leakage, and drives the earth leakage tripping mechanism to operate, thereby opening the earth leakage circuit breaker. Based on this, whether the leakage protection function of the leakage circuit breaker is normal can be detected by controlling the conduction of the test loop mechanism 2 and judging the opening or closing of the leakage circuit breaker.

The test button 21 is a driving member that controls the test circuit 22 to be turned on or off. The test button 21 can have two positions in the installation cavity, and when the test button 21 is located at the first position, the test loop 22 is disconnected; when the test button 21 is in the second position, the test loop 22 is conductive. The operation of the test button 21 may be a movement from the first position to the second position, or a movement from the second position to the first position. The trajectory of the test button 21 when moved may be a straight line.

The test circuit 22 is a circuit for performing switching. As shown in fig. 2, the test circuit 22 includes a movable contact piece 221 and a stationary contact piece 222, and the movable contact piece 221 is configured to contact with or separate from the stationary contact piece 222 when the test button 21 is actuated. The static contact piece 222 is in a static state in the housing 1, and the movable contact piece 221 can be elastically deformed by force in the housing 1 and is in contact with the static contact piece 222. The movable contact piece 221 and the fixed contact piece 222 are electrically connected with the leakage protection circuit.

To facilitate understanding of the process of turning test loop 22 on or off by the forced action of test button 21, the following description is made in detail with reference to fig. 2.

The process of the test button 21 being forced to conduct the test loop 22 is that an external force is applied to the test button 21 to move the test button 21 from the first position to the second position, and the movable contact piece 221 is pressed in the moving process to make the movable contact piece 221 elastically deformed to approach and contact the static contact piece 222, and after the movable contact piece 221 contacts the static contact piece 222, the test loop 22 is conducted. In this process, the movable contact piece 221 is pressed by the test button 21 and stores force.

The process of the test button 21 being forced to open the test circuit 22 is that the external force applied to the test button 21 is removed to make the movable contact piece 221 reset in the direction away from the static contact piece 222 under the self-elastic action until the movable contact piece 221 is separated from the static contact piece 222, and after the movable contact piece 221 is separated from the static contact piece 222, the test circuit 22 is opened. Meanwhile, the movable contact piece 222 presses the test button 21 during the reset process, so that the test button 21 moves from the second position to the first position. In this process, the movable contact piece 221 releases the force accumulated during the conduction of the test circuit 22 to the test button 21.

It should be noted that, in the process of moving the test button 21 from the first position to the second position, the force applying body for applying force to the test button 21 may be a person or other external components; the force applied to the test button 21 during the movement from the second position to the first position is applied to restore the normal state after the movable contact 221 is elastically deformed.

Based on the above description and combining with the actual conditions, in the normal use process of the residual current circuit breaker, the test button 21 is in the first position, if the test button 21 protrudes out of the housing 1, then the test button 21 is easily stressed and moves to the second position, so that the movable contact piece 221 is contacted with the static contact piece 222, the residual current circuit breaker is switched off, and the normal use of the residual current circuit breaker is influenced.

Therefore, the limit structure 3 is required to limit the test button 21 from protruding out of the housing 1, so as to reduce the possibility of the test button 21 being touched by mistake. When the limit structure 3 limits the test button 21, in some possible embodiments, the limit structure 3 may be configured to include a first limit structure located on the test button 21 and a second limit structure located on the housing 1, and the second limit structure is connected to the first limit structure to limit the test button 21. For example, one of the first limiting structure and the second limiting structure can be set as a blind hole, and the other can be set as a protrusion matched with the blind hole, so that the test button 21 can be limited after the protrusion is connected with the blind hole. In other possible embodiments, as shown in fig. 3 and 4, the limiting structure 3 may further be configured to include a first limiting member 31 and a second limiting member 32 that are engaged with each other, where the first limiting member 31 is disposed on the test button 21 and does not protrude from the housing 1; the second limiting member 32 is disposed on the housing 1. Along the action direction of the test button 21, at least a part of the second limiting member 32 is opposite to the first limiting member 31 so as to abut against the first limiting member 31 to limit the test button 21 when the test button 21 is reset. For example, the first limiting member 31 may be a first protrusion having a recess, the second limiting member 32 may be a second protrusion having a protrusion, and the protrusion of the second protrusion may be located in the recess of the first protrusion and abut against the wall surface of the recess to limit the test button 21. The actuation direction of the test button 21 may be a direction when the test button 21 moves from the first position to the second position, or may be a direction when the test button 21 moves from the second position to the first position. At least part of the second limiting member 32 is opposite to the first limiting member 31 along the action direction of the test button 21, which means that the projections of the second limiting member 32 and the first limiting member 31 on the same projection plane are at least partially overlapped.

In this another embodiment, it should be noted that the forcing body may force the first limiting member 31 to make the first limiting member 31 force the test button 21, that is: the test button 21 is indirectly applied with force to reduce the possibility that the test button 21 is damaged due to the influence of the external environment. In addition, the first limiting member 31 can be detachably connected with the test button 21, so that when the first limiting member 31 is damaged, the first limiting member 31 can be independently replaced, and the maintenance cost can be saved. It should be noted that, since the first limiting member 31 is disposed on the test button 21, when the test button 21 does not protrude from the housing 1, but the first limiting member 32 protrudes from the housing 1, the first limiting member 31 is easily touched by mistake, and drives the test button 21 to move from the first position to the second position, so that the test loop 22 is turned on. Therefore, when the first stopper 31 does not protrude from the housing 1, the possibility of the test button 21 being touched by mistake can be reduced.

Among the technical scheme of this application embodiment, through set up limit structure 3 in electric leakage circuit breaker for limit structure 3 can restrict test button 21 protrusion in casing 1, with in electric leakage circuit breaker use, reduces test button 21 and is touched and switch on test circuit 22 by the mistake, with the possibility of electric leakage circuit breaker separating brake, improves electric leakage circuit breaker's performance.

According to other embodiments of the present application, as shown in fig. 3, the first limiting member 31 is configured as a first limiting plate, and the second limiting member 32 is configured as a second limiting plate, and at least a part of the second limiting plate is opposite to the first limiting plate along the action direction of the test button 21.

The first stopper plate is a plate provided on the test button 21 and extending toward the housing 1. The second stopper plate is a plate provided on the housing 1 and extending toward the test button 21.

Along the action direction of the test button 21, at least part of the second limiting plate is opposite to the first limiting plate, which means that the projections of the second limiting plate and the first limiting plate on the same projection plane are at least partially overlapped. The position of the second limit plate on the housing 1 can be determined according to the position of the first limit plate on the test button 21; for example, when the first stopper plate is provided at a portion of the test button 21 close to the movable contact 221, the second stopper plate may be provided at a portion of the case 1 close to the movable contact 221; when the first stopper plate is provided at a portion of the test button 21 away from the movable contact piece 221, the second stopper plate may be provided on an outer wall of the case 1 away from the movable contact piece 221.

The first limiting plate can be basically vertical to the action direction of the test button 21 and is basically parallel to the second limiting plate, so that the first limiting plate can be close to or far away from the second limiting plate along with the movement of the test button 21 and is abutted by the second limiting plate when contacting the second limiting plate. The basically vertical mode means that an included angle between the first limiting plate and the moving direction of the test button 21 is 80-100 degrees; the basically parallel means that the included angle between the first limiting plate and the second limiting plate is less than or equal to 20 degrees.

Among the technical scheme of this application embodiment, the second limiting plate can be through the first limiting plate of butt and spacing test button 21. In addition, when second limiting plate and first limiting plate looks butt, the butt area between the two is bigger, and the butt dynamics is stronger, can make test button 21 more be difficult for protruding casing 1.

According to other embodiments of the present application, as shown in fig. 4, the first limiting member 31 includes a female stop, and the second limiting member 32 includes a male stop, at least a portion of which is opposite to the female stop along the actuating direction of the test button 21.

The male spigot and the female spigot are in abutting connection to limit the test button 21. The male end stop may be a recessed edge provided on the housing 1 and the female end stop may be a flange provided on the first retaining member 31. At least part of the male spigot is opposite to the female spigot along the action direction of the test button 21, which means that the projection of the male spigot and the female spigot on the same projection plane at least partially coincide.

The concave edge can be by being connected and being concave surface and the first spacing wall that the non-zero contained angle set up and constitute, the flange can be by being connected and being convex surface and the spacing wall of second that the non-zero contained angle set up and constitute, during public tang and female tang looks butt, the concave surface can with convex surface looks butt, and first spacing wall can with the spacing wall butt of second.

In the technical scheme of the embodiment of the application, the male spigot can limit the test button 21 by abutting against the female spigot. When the male and female stoppers abut against each other, the first stopper wall at the male stopper and the second stopper wall at the female stopper abut against each other, and the test button 21 is restricted from moving in a direction other than the operation direction.

According to other embodiments of the present application, fig. 5 is a schematic view illustrating that the first limiting member 31 is mounted on the housing 1 in some embodiments of the present application. As shown in fig. 5, the housing 1 comprises a first wall 11 and a second wall 12, the first wall 11 and the second wall 12 having a non-zero included angle therebetween. The first retaining member 31 is disposed between the first wall 11 and the second wall 12, and the second retaining member 32 is disposed on the first wall 11 and/or the second wall 12.

In this embodiment, the shape of the first limiting member 31 may be the same as the shape of the transition portion of the first wall 11 and the second wall 12, for example, when the first wall 11 and the second wall 12 transition through a sharp corner, the first limiting member 31 may be set to be a sharp corner structure, and when the first wall 11 and the second wall 12 transition through an arc, the first limiting member 31 may be set to be an arc structure, and the specific structure of the first limiting member 31 is not particularly limited in this embodiment.

When the first wall 11 and the second wall 12 have a non-zero included angle therebetween and the first limiting member 31 is disposed between the first wall 11 and the second wall 12, the force applying space for applying a force to the first limiting member 31 can be increased relative to the case where the first limiting member 31 is disposed on the first wall 11 or the second wall 12. For example, when the first limiting member 31 is disposed on the first wall 11, the first limiting member 31 can be only applied with a force in a space range close to the first wall 11, and when the first limiting member 31 is disposed between the first wall 11 and the second wall 12, the first limiting member 31 can be not only applied with a force in a space range close to the first wall 11, but also applied with a force in a space range close to the second wall 12. In addition, when a non-zero included angle is formed between the first wall 11 and the second wall 12, and the first limiting member 31 is disposed on the first wall 11 or the second wall 12, the force applying body for applying force to the first limiting member 31 needs to extend into the housing 1, so that the test button 21 conducts the test loop 22; however, when the first stopper 31 is disposed between the first wall 11 and the second wall 12, the urging body does not need to extend into the housing 1 to urge the first stopper 31, and the size of the urging body is not easily limited, which facilitates urging of the first stopper 31.

Further, when a non-zero included angle is formed between the first wall 11 and the second wall 12, the first limiting member 31 is disposed between the first wall 11 and the second wall 12, and the second limiting member 32 is disposed on the first wall 11 and the second wall 12, the second limiting member 32 can limit at least two positions of the first limiting member 31, which is beneficial to improving the limiting force of the second limiting member 32 on the first limiting member 31, so that the test button 21 is less likely to protrude out of the housing 1. For example, the second limiting member 32 can limit two ends of the first limiting member 31 contacting the first wall 11 and the second wall 12.

According to other embodiments of the present application, with continued reference to fig. 5, the housing 1 further comprises a first transition wall 13, a second transition wall 14 connected between the first wall 11 and the second wall 12. The first transition wall 13 and the second transition wall 14 are distributed on two sides of the first limiting member 31 to protect the first limiting member 31.

The first transition wall 13 and the second transition wall 14 are walls for protecting and guiding the first stopper 31. The shapes of the first transition wall 13 and the second transition wall 14 may be set according to the structure of the first stopper 31 in the foregoing embodiment, for example, when the first stopper 31 is set to be a pointed structure, the first transition wall 13 and the second transition wall 14 may be set to be a pointed structure, and when the first stopper 31 is set to be a circular arc structure, the first transition wall 13 and the second transition wall 14 may be set to be a circular arc structure.

When the first transition wall 13 and the second transition wall 14 are distributed on two sides of the first limiting member 31, along the connecting line direction of the first transition wall 13 and the second transition wall 14, the first limiting member 31 is covered by the first transition wall 13 and the second transition wall 14, so that the first limiting member 31 is not easily touched by mistake in the connecting line direction of the first transition wall 13 and the second transition wall 14. In addition, when the first limiting member 31 is covered by the first transition wall 13 and the second transition wall 14, the first limiting member 31 is not easily damaged by impact of an external component or the like.

According to other embodiments of the present application, fig. 6 is a schematic view of a guiding structure 4 according to some embodiments of the present application. As shown in fig. 6, the circuit breaker further comprises a guiding structure 4. The guide structure 4 is provided in the housing 1 and/or the first stopper 31, and the guide structure 4 is used to guide the test button 21 when the test button 21 is operated.

Based on the foregoing description, the test button 21 can move in a straight line to approach or move away from the movable contact piece 221 to turn on or off the test circuit 22. However, there is a possibility that the test button 21 deviates from the movement locus during the movement, and when the test button 21 deviates from the movement locus, the movable contact piece 221 may not be brought into contact with or separated from the stationary contact piece 222, so that the function of the test circuit mechanism 2 may not be realized. For example, in the process of moving the test button 21 from the first position to the second position, if the test button 21 deviates from the motion track, the test button may abut against other components inside the earth leakage breaker, so that the other components may move and even be damaged; when the test button 21 moves from the second position to the first position, if the test button 21 deviates from the movement track, it may be jammed between the housing 1 and other structures, resulting in a "jam" phenomenon, and the next action cannot be performed.

In the technical scheme of the embodiment of the application, in the process that the test button 21 conducts the test loop 22, the guide structure 4 can reduce the possibility that the test button 21 presses against other components except the test loop 22; the guide structure 4 can reduce the possibility that the test button 21 is skewed and stuck during the process that the test button 21 disconnects the test loop 22. In conclusion, the guide structure 4 can improve the accuracy of the operation of the test button 21 and the usability of the test circuit mechanism 2.

According to other embodiments of the present application, please refer to fig. 6 continuously, the guiding structure 4 includes a guiding protrusion 41 and a guiding recess 42, which are matched with each other, the guiding protrusion 41 is disposed on the housing 1, the guiding recess 42 is disposed on the first limiting member 31, and at least a portion of the guiding protrusion 41 is in contact fit with a groove wall of the guiding recess 42.

The guide protrusion 41 may protrude from the housing 1 toward the first limiting member 31 and extend from one end of the first limiting member 31 far from the movable contact 221 to one end close to the movable contact 221, and the guide groove 42 may be recessed from one side of the first limiting member 31 close to the housing 1 to the other side, so that when the test button 21 is close to or far from the movable contact 221, the outer wall of the guide protrusion 41 may contact with the groove wall of the guide groove 42 to guide the first limiting member 31.

The guide boss 41 may be provided in a columnar shape, specifically, a columnar shape or a prismatic shape. The guide groove 42 may be provided as a cylindrical groove or a prismatic groove adapted to the guide boss 41. When the guiding projection 41 is disposed to be cylindrical and the guiding groove 42 is disposed to be a cylindrical groove, the guiding projection 41 is not easy to scratch the groove wall of the groove due to the smooth side surface of the cylinder.

In the technical scheme of this embodiment, the first limiting member 31 can be guided by the cooperation of the guide boss 41 and the guide groove 42, so that the test button 21 can be guided, and the accuracy of the action of the test button 21 is improved. In addition, the guide structure 4 is arranged to comprise the guide boss 41 and the guide groove 42, so that the guide structure 4 is simpler, and the processing and manufacturing of the residual current circuit breaker are more convenient.

According to further embodiments of the present application, with continued reference to fig. 6, the guide structure 4 comprises a guide channel 43, the guide channel 43 is arranged in the housing 1, and a portion of the test button 21 is in contact engagement with a side wall of the guide channel 43.

The guide channel 43 may be disposed between the first retaining member 31 and the movable contact piece 221. Specifically, for example, a guide block may be provided between the first retaining member 31 and the movable contact piece 221, and the guide passage 43 may be provided on the guide block. A portion of the test button 21 is fitted in the guide channel 43 so that the test button 21 can move along the side wall of the guide channel 43 when actuated, thereby guiding the test button 21.

The profile of the guide channel 43 may be configured to be the same as or match the profile of the test button 21. Illustratively, when the test button 21 is provided in a cylindrical shape, the guide channel 43 may be provided in the same cylindrical shape as the test button 21, or may be provided in a half cylindrical shape matching the test button 21. Similar to the aforementioned structure of the guide boss 41 and the guide groove 42, when both the test button 21 and the guide passage 43 are provided in a cylindrical shape, the possibility of damage to the guide passage 43 by the test button 21 can be reduced.

In the technical scheme of this application embodiment, direction passageway 43 can realize the direction to test button 21 with test button 21 cooperation to improve the accuracy of test button 21 action.

According to other embodiments of the present application, FIG. 7 is a schematic view of the attachment of test loop 22 in some embodiments of the present application. As shown in fig. 7, the housing 1 further includes a first fixing groove 15, a first fixing block 16, a second fixing groove 17, and a second fixing block 18, the first fixing block 16 being for pressing at least a part of the movable contact piece 221 in the first fixing groove 15, and the second fixing block 18 being for pressing at least a part of the stationary contact piece 222 in the second fixing groove 17.

The case 1 may include an upper case a and a lower case B. The first fixing groove 15 and the second fixing groove 17 may be grooves formed in the lower case B, and specifically, the lower case B may have a first boss and a second boss, the first boss may have the first fixing groove 15, the second boss may have the second fixing groove 17, or the first boss may have the first fixing groove 15 with the fixing plate of the lower case B, and the second boss may have the second fixing groove 17 with the outer wall of the lower case B. The shape of the first fixing groove 15 may be set according to a partial shape of the movable contact piece 221, for example, when the movable contact piece 221 is configured to have a U-shaped structure, the first fixing groove 15 may be configured to have a U-shape, a C-shape adapted to a bent portion of the movable contact piece 221, or the like. Also, the shape of the second fixing groove 17 may be set according to the shape of the stationary contact 222, and will not be described in detail.

The first fixing block 16 and the second fixing block 18 may be disposed on the upper case a, the first fixing block 16 may be disposed opposite to the first fixing groove 15, and the second fixing block 18 may be disposed opposite to the second fixing groove 17. When the upper case a and the lower case B are assembled to form the case 1, the first fixing block 16 may be positioned at a notch portion of the first fixing groove 15 and at least partially cover the first fixing groove 15; the second fixing block 18 may be located at a notch portion of the second fixing groove 17 and at least partially cover the second fixing groove 17.

It should be noted that, along the first direction X, the size of the first fixing groove 15 may be the same as the size of the movable contact piece 221, so that when the first fixing block 16 covers the first fixing groove 15, the first fixing block just can contact with the movable contact piece 221 and press and fix the movable contact piece, thereby avoiding a phenomenon that the first fixing block 16 does not press the movable contact piece 221, or avoiding the movable contact piece 221 from being bent and broken by the first fixing block 16. Similarly, the depth of the second fixing groove 17 may be the same as the width of the stationary contact 222. The first direction X is a depth direction of the first and second fixing grooves 15 and 17.

In the technical solution of the embodiment of the application, the first fixing slot 15 may limit the static contact 222 to shake, vibrate or skew towards the direction perpendicular to the notch of the first fixing slot 15 through the slot wall, and the first fixing block 16 may limit the static contact 222 to move or vibrate towards the notch of the first fixing slot 15; similarly, the second fixing groove 17 may limit the moving contact piece 221 from shaking, vibrating or skewing in a direction perpendicular to the notch of the second fixing groove 17 by the groove wall, and the second fixing block 18 may limit the moving contact piece 221 from moving or vibrating in a direction toward the notch of the second fixing groove 17; the movable contact piece 221 and the static contact piece 222 are fixed through the fixing structure, so that the physical contact firmness and the electric connection stability of the movable contact piece 221 and the static contact piece 222 are improved.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. An electrical leakage breaker, comprising:

a housing having a mounting cavity;

the test loop mechanism is arranged in the mounting cavity; the test loop mechanism comprises a test button and a test loop, wherein the test button is used for acting under stress so as to connect or disconnect the test loop;

and the limiting structure is used for limiting the test button to protrude out of the shell.

2. A residual current circuit breaker as claimed in claim 1, characterized in that said limiting structure comprises a first limiting member and a second limiting member, which are mutually engaged, said first limiting member being disposed on said test button, and said first limiting member not protruding from said case, said second limiting member being disposed on said case;

along the action direction of the test button, at least part of the second limiting part is opposite to the first limiting part so as to abut against the first limiting part to limit the test button when the test button is reset.

3. A residual current circuit breaker according to claim 2, characterized in that said first retaining member is configured as a first retaining plate and said second retaining member is configured as a second retaining plate;

and along the action direction of the test button, at least part of the second limiting plate is opposite to the first limiting plate.

4. A residual current circuit breaker as claimed in claim 2, characterized in that said first retaining member comprises a female spigot and said second retaining member comprises a male spigot;

at least a portion of the male tang opposes the female tang in the direction of actuation of the test button.

5. A residual current circuit breaker as claimed in claim 2, characterized in that said casing comprises a first wall and a second wall, said first wall and said second wall having a non-zero included angle therebetween; the first limiting piece is arranged between the first wall and the second wall, and the second limiting piece is arranged on the first wall and/or the second wall.

6. The residual current circuit breaker according to claim 5, wherein said housing further comprises a first transition wall and a second transition wall connected between said first wall and said second wall, said first transition wall and said second transition wall being disposed on both sides of said first retaining member to protect said first retaining member.

7. An electrical leakage breaker as claimed in claim 2, characterized in that the breaker further comprises a guiding structure, which is arranged at the housing and/or the first retaining member, and which is adapted to guide the test button when the test button is actuated.

8. An electrical leakage breaker as claimed in claim 7, wherein the guiding structure comprises a guiding protrusion and a guiding groove, the guiding protrusion is disposed on the housing, the guiding groove is disposed on the first limiting member, and at least a portion of the guiding protrusion is in contact with and fits with a groove wall of the guiding groove.

9. An electrical leakage breaker as claimed in claim 7, characterized in that the guide structure comprises a guide channel which is provided in the housing, a part of the test button being in contact fit with a side wall of the guide channel.

10. A residual current circuit breaker as claimed in claim 1, characterized in that said test circuit comprises a movable contact and a stationary contact, said movable contact being adapted to be brought into contact with or separated from said stationary contact upon actuation of said test button;

the shell further comprises a first fixing groove, a first fixing block, a second fixing groove and a second fixing block, wherein the first fixing block is used for enabling at least part of the movable contact piece to be pressed in the first fixing groove in a propping mode, and the second fixing block is used for enabling at least part of the static contact piece to be pressed in the second fixing groove in a propping mode.

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