Miniature electric leakage protection circuit breaker

Abstract

The utility model discloses a small leakage protection circuit breaker, an operating mechanism thereof and a double-breakpoint test loop. The operating mechanism comprises a handle and a reset torsion spring, the operating mechanism has a switching-on state and a switching-off state, and the reset torsion spring is used for providing reset force for the handle; wherein the reset torsion spring is made of a conductive material; the double-breakpoint test loop comprises a first breakpoint, a second breakpoint and a test button; when the operating mechanism is in a closed state, the first breakpoint is in an on state under the pressing of the operating mechanism; when the operating mechanism is in an opening state, the first breakpoint is in a breaking state; the second breakpoint comprises a second static contact and a second moving contact, the second moving contact and the reset torsion spring are integrally formed, the second moving contact is located below the test button, and when the test button is pressed by external force, the second moving contact and the second static contact are in a connected state; when the first breakpoint and the second breakpoint are both in the on state, the double-breakpoint test loop is conducted; the device has the advantage of being more compact in structure.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a circuit breaker, specifically a small leakage protection circuit breaker. Background Art

[0002] The leakage protection circuit breaker is also a type of circuit breaker. Its main function is to trip the circuit breaker when leakage occurs in the main circuit, thereby protecting the main circuit where the load is located to avoid personal injury and property damage.

[0003] As a common type of circuit breaker, a small leakage protection circuit breaker is often equipped with a test circuit. The function of the test circuit is for the user to press it to simulate the occurrence of leakage to identify whether the circuit breaker will trip, so as to determine whether the leakage protection circuit breaker is damaged.

[0004] Most of the earliest leakage test circuits adopted a single breakpoint type. When this type of circuit breaker is connected to the line, the circuit board and the voltage trip coil are easily energized for a long time and burned out.

[0005] With the continued in-depth research of technical personnel in this field, a double-breakpoint leakage test circuit has also appeared in recent years. One of the breakpoints of this leakage test circuit is controlled by the operating mechanism. The breakpoint is only connected when the operating mechanism is in the closed state, and the breakpoint is disconnected when the circuit breaker is in the open state.

[0006] This double-breakpoint leakage test circuit can solve the problem of circuit breaker reverse input line, such as CN217009102U, which is a circuit breaker using a double-breakpoint leakage test circuit.

[0007] However, the existing double-breakpoint leakage test circuit also has the disadvantage of too many internal conductors, making it difficult to make the circuit breaker more miniaturized.

[0008] Therefore, how to utilize some of the original structures of the circuit breaker as part of the leakage test circuit to reduce the internal space occupied by the circuit breaker and make the circuit breaker more miniaturized will undoubtedly be a development trend. Summary of the invention

[0009] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a small leakage protection circuit breaker.

[0010] The present application provides: a small leakage protection circuit breaker, an operating mechanism and a double breakpoint test circuit; the operating mechanism includes a handle and a reset torsion spring, the operating mechanism includes a closing state and an opening state, and the reset torsion spring is used to provide a reset force to the handle; wherein the reset torsion spring is made of conductive material; the double breakpoint test circuit includes a first breakpoint, a second breakpoint and a test button; when the operating mechanism is in the closing state, the first breakpoint is in a connected state under the pressure of the operating mechanism; when the operating mechanism is in the opening state, the first breakpoint is in a disconnected state; the second breakpoint includes a second static contact and a second moving contact, the second moving contact is integrally formed with the reset torsion spring, the second moving contact is below the test button, and when the test button is pressed down by an external force, the second moving contact and the second static contact are prompted to be in a connected state; when the first breakpoint and the second breakpoint are both in the connected state, the double breakpoint test circuit is turned on.

[0011] In some embodiments of the present application, a first shell, a second shell and a third shell are also included, and the first shell and the third shell are respectively assembled on both sides of the second shell; the first shell and the second shell together form a P-pole space, and the third shell and the second shell together form an N-pole space, and the first breakpoint and the second breakpoint are both in the N-pole space.

[0012] In some embodiments of the present application, a first fixed wall is provided on the third shell, and the first fixed wall is located below the second moving contact; a first card slot is provided on the first fixed wall on the side where the first shell is located, and a trigger through slot is provided on the surface of the first fixed wall where the second moving contact is located, and the trigger through slot is connected to the first card slot; a second card slot is also provided on the first fixed wall, and the second card slot is connected to the first card slot, and the second card slot is arranged at an angle to the first card slot, and the second static contact is clamped in the first card slot and the second card slot.

[0013] In some embodiments of the present application, the second moving contact is arranged to be inclined, and the inclination is in a manner of gradually approaching the second static contact from the third housing toward the direction where the first housing is located.

[0014] In some embodiments of the present application, the third shell is provided with a second fixed wall on one side of the first fixed wall, the first fixed wall and the second fixed wall together form an installation space for the second breakpoint, and a through hole is opened on the second fixed wall, and one end of the reset torsion spring is inserted into the installation space through the through hole.

[0015] In some embodiments of the present application, the double breakpoint test circuit also includes a circuit board, a first wire, a second wire, a yoke and a third conductor; one end of the first wire is welded to the circuit board, and the other end of the first wire is welded to the first static contact; one end of the first moving contact is electrically connected to the yoke and one end of the third conductor, and the other end of the third conductor is electrically connected to the second static contact or the two are an integral part; one end of the second wire is welded to the circuit board, and the other end of the second wire is welded to the reset torsion spring.

[0016] In some embodiments of the present application, the third shell includes a first shell portion and a second shell portion, the length of the first shell portion is smaller than the length of the second shell portion; a dividing rib is provided on the first shell portion, the dividing rib includes opposite first side surfaces and second side surfaces, a first wiring groove for accommodating part of the first wire and the second wire is formed between the first side surface and the side wall of the first shell portion, and the second side surface is adjacent to the operating mechanism; a rivet hole for a rivet to pass through is provided on the dividing rib.

[0017] In some embodiments of the present application, the third shell includes a first shell portion and a second shell portion, the length of the first shell portion is smaller than the length of the second shell portion; a handle installation area is provided on the first shell portion, and a second wiring groove is also provided on the first shell portion located around the handle installation area, and the second wire portion is located in the second wiring groove.

[0018] In some embodiments of the present application, an electromagnetic release is also included, and a first protrusion located above the electromagnetic release is provided on the third shell; the first breakpoint includes a first moving contact and a first static contact, the first moving contact includes a fixed portion and a trigger portion, the fixed portion is clamped on the first protrusion, and the trigger portion extends in the direction of the operating mechanism.

[0019] In some embodiments of the present application, the operating mechanism includes a contact support on which a driving column is provided; the first breakpoint includes a first moving contact and a first static contact, the first moving contact is located near the driving column, and when the operating mechanism is in a closed state, the first moving contact is connected to the first static contact under the pressure of the driving column.

[0020] As can be seen from the above, the technical solution of the present application, first, sets the reset torsion spring of the handle into a conductive structure, and the reset torsion spring is equivalent to a part of the test loop conductor. Since the reset torsion spring itself is a necessary structure of the traditional small circuit breaker, using it to replace some conductors to realize the test function will not only not affect the realization of the test function, but also replace part of the conductor, which is conducive to a more miniaturized product design. Secondly, the operating mechanism is used to realize the connection and disconnection of a breakpoint, so that the product can be guaranteed to have the function of reverse input line, protecting the leakage circuit board and the release. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A three-dimensional diagram showing a small leakage protection circuit breaker according to an embodiment of the present application

[0023] Figure 2 A three-dimensional diagram of a small leakage protection circuit breaker without a first housing is shown in an embodiment of the present application;

[0024] Figure 3 A three-dimensional diagram of a small leakage protection circuit breaker without a third housing is shown in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of a double-breakpoint leakage test circuit in a small leakage protection circuit breaker according to an embodiment of the present application is shown;

[0026] Figure 5 A schematic diagram showing a first shell portion of a third shell in a small leakage protection circuit breaker according to an embodiment of the present application is shown;

[0027] Figure 6 A schematic diagram showing the structure of a third housing and a double-breakpoint leakage test circuit in a small leakage protection circuit breaker according to an embodiment of the present application is shown;

[0028] Figure 7 Shows Figure 6 Enlarged view of part A in the middle;

[0029] Figure 8 Shows Figure 6 Enlarged view of middle part B;

[0030] Fig. 9 Shows Figure 6 Enlarged view of part C in the middle. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0036] like Figure 1-Figure 9 As shown, an embodiment of the present application is: a small leakage protection circuit breaker, which includes a P pole and an N pole, and both the P pole and the N pole have a moving contact and a static contact.

[0037] The circuit breaker includes a first shell 100, a second shell 101, a third shell 103, a P-pole moving contact 201, a P-pole static contact 202, an N-pole moving contact 203, an N-pole static contact 204, a P-pole arc extinguishing chamber 205, an N-pole arc extinguishing chamber 206, a thermal release 207, an operating mechanism 208, an electromagnetic release 209, a leakage release 210 and a double breakpoint test circuit 300.

[0038] Here, the first shell 100 , the second shell 101 , and the third shell 103 are formed by assembling and then fixed by riveting.

[0039] The first shell 100 and the second shell 101 together form a P-pole space S1 , and the third shell 103 and the second shell 101 together form an N-pole space S2 .

[0040] The P-pole moving contact 201, the P-pole static contact 202, the P-pole arc extinguishing chamber 205, and the thermal release 207 are all located in the P-pole space S1.

[0041] The N-pole moving contact 203, the N-pole stationary contact 204, the N-pole arc extinguishing chamber 206 and the double-breakpoint test circuit 300 are all located in the N-pole space S2.

[0042] The operating mechanism 208 includes a handle 2081, a reset torsion spring 2082, a U-shaped connecting rod 2083, a trip buckle 2084, a lock buckle 2085, a contact support 2086 and a main tension spring 2087. The operating mechanism 208 here has two states: an open state and a closed state. In the closed state, the P-pole moving contact 201 and the P-pole static contact 202 are in contact, and the N-pole moving contact 203 and the N-pole static contact 204 are also in contact. In the open state, the P-pole moving contact 201 and the P-pole static contact 202 are separated, and the N-pole moving contact 203 and the N-pole static contact 204 are also separated. Here, the working principle of the operating mechanism 208 is common knowledge in the field and will not be repeated.

[0043] The N-pole arc extinguishing chamber 206 is used to eliminate the arc generated when the N-pole moving contact 203 and the N-pole static contact 204 are separated.

[0044] The P-pole arc extinguishing chamber 205 is used to eliminate the arc generated when the P-pole moving contact 201 and the P-pole static contact 202 are separated.

[0045] The thermal release 207 is a bimetallic strip, which is used to drive the lock 2085 to rotate when the circuit protected by the circuit breaker is overloaded, so that the operating mechanism 208 in the closed state is unlocked, so that the operating mechanism 208 performs the opening operation.

[0046] The double breakpoint test circuit 300 includes a circuit board 301 , a first wire 302 , a second wire 303 , a yoke 304 (a part of the electromagnetic release 209 ), a third conductor 305 , a first breakpoint 306 , a second breakpoint 307 and a test button 308 .

[0047] Here, the first breakpoint 306 is associated with the operating mechanism 208, and when the operating mechanism 208 is in the closed state, it is in the connected state under the pressure of the operating mechanism 208. This is specifically achieved as follows: the contact support 2086 of the operating mechanism 208 has a driving column 20861, and the driving column 20861 can drive the first breakpoint 306 to be connected and finally maintain the connected state during the movement of the operating mechanism 208 from the opening direction to the closing direction.

[0048] Here, the second breakpoint 307 is driven by the test button 308, and when the test button 308 is pressed down by an external force, the second moving contact 3071 and the second static contact 3072 are connected. The test circuit here is turned on when the first breakpoint 306 and the second breakpoint 307 are both in the connected state, thereby generating a simulated leakage effect. The specific simulated leakage generation circuit is a conventional technical means for those skilled in the art, and the detailed circuit is not introduced here.

[0049] The double breakpoint test circuit 300 is specifically connected as follows:

[0050] The first breakpoint 306 includes a first moving contact 3061 and a first stationary contact 3062 . The first moving contact 3061 is located near the driving column 20861 . When the operating mechanism 208 is in the closed state, the first moving contact 3061 is pressed by the driving column 20861 and is connected to the first stationary contact 3062 .

[0051] The second breakpoint 307 includes a second static contact 3072 and a second moving contact 3071. The second moving contact 3071 is integrally formed with a reset torsion spring 2082 (conductive material). The second moving contact 3071 is located below the test button 308. When the test button 308 is pressed down by an external force, the second moving contact 3071 and the second static contact 3072 are connected.

[0052] One end of the first wire 302 is welded to the circuit board 301, and the other end of the first wire 302 is welded to the first static contact 3062. One end of the first moving contact 3061 is electrically connected to the yoke 304 and one end of the third conductor 305 (here in a counteracting manner), and the other end of the third conductor 305 and the second static contact 3072 are integrally formed.

[0053] One end of the second wire 303 is welded to the circuit board 301 , and the other end of the second wire 303 is welded to the return torsion spring 2082 .

[0054] Of course, the above test circuit can also be simply replaced, for example, the third conductor 305 and the second static contact 3072 are made into separate structures and electrically connected by welding.

[0055] A first fixed wall 103a is provided on the third housing 103, and the first fixed wall 103a is just below the second moving contact 3071. A first slot 103a1 is provided on the first fixed wall 103a facing the first housing 100, and a triggering slot 103a2 is provided on the surface of the first fixed wall 103a facing the second moving contact 3071, and the triggering slot 103a2 is connected to the first slot 103a1; a second slot 103a3 is also provided on the first fixed wall 103a, and the second slot 103a3 is connected to the first slot 103a1, and the second slot 103a3 is arranged at an angle with the first slot 103a1, and the second static contact 3072 is clamped in the first slot 103a1 and the second slot 103a3. This slot design will facilitate the installation of the second static contact 3072 and improve stability.

[0056] Here, the second moving contact 3071 is tilted, and the tilting manner is such that it gradually moves toward the second static contact 3072 from the third housing 103 toward the direction where the first housing 100 is located. Such a structure is more conducive to the connection of the test circuit.

[0057] A second fixed wall 103b is provided on one side of the third housing 103 located at the first fixed wall 103a. The first fixed wall 103a and the second fixed wall 103b are connected to form a mounting space S3 of the second breakpoint 307. The second contact is located in the mounting space S3. Here, a through hole 103b1 is provided on the second fixed wall 103b. One end of the reset torsion spring 2082 penetrates into the mounting space S3 through the through hole 103b1. The second moving contact 3071 is formed by bending the penetrated end of the reset torsion spring 2082.

[0058] Here, the third shell 103 includes a first shell 1031 and a second shell 1032. The length of the first shell 1031 is smaller than that of the second shell 1032. The third shell 103 is generally in the shape of a convex letter. A separation rib 1031a is provided on the first shell 1031. The separation rib 1031a includes an opposite first side surface and a second side surface. A first wiring groove 1031b for accommodating part of the first wire 302 and the second wire 303 is formed between the first side surface and the side wall of the first shell 1031. After the first wire 302 and the second wire 303 are led out from the circuit board 301, a part of them enters the first wiring groove 1031b and then walks out of the first wiring groove 1031b. Here, a rivet hole is provided on the separation rib 1031a. Such a design of the first wiring groove 1031b is not only conducive to wiring, but also utilizes the feature of the separation rib 1031a where the rivet hole is located to achieve this wiring effect.

[0059] A handle installation area 1031c is provided on the first shell 1031. It can be said that the handle 2081 is rotatably installed in the handle installation area 1031c. A second wiring groove 1031d is also provided on the periphery of the handle installation area 1031c. The second wiring groove 1031d is also formed by the protrusion on the first shell 1031. The design of the second wiring groove 1031d can clamp a part of the second wire 303 in the second wiring groove 1031d. This can not only improve the installation stability of the second wire 303, but also avoid the internal wires being messy.

[0060] A first protrusion 1031e is provided on the third housing 103 and is located above the electromagnetic release 209. The first moving contact 3061 includes a fixing portion 3061a and a triggering portion 3061b. The fixing portion 3061a is clamped on the first protrusion 1031e, and the triggering portion 3061b extends toward the direction of the driving column 20861. The fixing portion 3061a is generally U-shaped and covers a portion of the surface of the first protrusion 1031e.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A small leakage protection circuit breaker, its operating mechanism and double breakpoint test circuit; the operating mechanism includes a handle and a reset torsion spring, the operating mechanism includes a closing state and an opening state, and the reset torsion spring is used to provide a reset force to the handle; characterized in that: The reset torsion spring is made of conductive material; the double breakpoint test circuit includes a first breakpoint, a second breakpoint and a test button; when the operating mechanism is in a closed state, the first breakpoint is in an on state under the pressure of the operating mechanism; when the operating mechanism is in an open state, the first breakpoint is in an off state; the second breakpoint includes a second static contact and a second moving contact, the second moving contact is integrally formed with the reset torsion spring, and the second moving contact is located below the test button, and when the test button is pressed down by external force, the second moving contact and the second static contact are caused to be in a connected state; when the first breakpoint and the second breakpoint are both in the on state, the double breakpoint test circuit is conductive.

2. The small leakage protection circuit breaker according to claim 1 is characterized in that: It also includes a first shell, a second shell and a third shell. The first shell and the third shell are respectively assembled on both sides of the second shell. The first shell and the second shell together form a P-pole space, and the third shell and the second shell together form an N-pole space. The first breakpoint and the second breakpoint are both in the N-pole space.

3. The small leakage protection circuit breaker according to claim 2 is characterized in that: The third shell is provided with a first fixed wall, which is located below the second moving contact; the first fixed wall is provided with a first slot on the side facing the first shell, and a trigger slot is provided on the surface of the first fixed wall facing the second moving contact, and the trigger slot is connected with the first slot; the first fixed wall is also provided with a second slot, which is connected with the first slot, and the second slot is arranged at an angle to the first slot, and the second static contact is clamped in the first slot and the second slot.

4. The small leakage protection circuit breaker according to claim 3 is characterized in that: The second moving contact is arranged to be inclined, and the inclination is in a manner of gradually approaching the second static contact from the third housing toward the direction where the first housing is located.

5. The small leakage protection circuit breaker according to claim 3 is characterized in that: The third shell is provided with a second fixed wall on one side of the first fixed wall. The first fixed wall and the second fixed wall together form an installation space for the second breakpoint. A through hole is opened on the second fixed wall, and one end of the reset torsion spring penetrates into the installation space through the through hole.

6. The small leakage protection circuit breaker according to any one of claims 2 to 5, characterized in that: The double breakpoint test circuit also includes a circuit board, a first wire, a second wire, a yoke and a third conductor; one end of the first wire is welded to the circuit board, and the other end of the first wire is welded to the first static contact; one end of the first moving contact is electrically connected to the yoke and one end of the third conductor, and the other end of the third conductor is electrically connected to the second static contact or the two are integrated; one end of the second wire is welded to the circuit board, and the other end of the second wire is welded to the reset torsion spring.

7. The small leakage protection circuit breaker according to claim 6, characterized in that: The third shell includes a first shell portion and a second shell portion, the length of the first shell portion is smaller than that of the second shell portion; a dividing rib is provided on the first shell portion, the dividing rib includes a first side surface and a second side surface opposite to each other, a first wiring groove for accommodating part of the first wire and the second wire is formed between the first side surface and the side wall of the first shell portion, and the second side surface is adjacent to the operating mechanism; a rivet hole for a rivet to pass through is provided on the dividing rib.

8. The small leakage protection circuit breaker according to claim 6, characterized in that: The third shell includes a first shell portion and a second shell portion, the length of the first shell portion is smaller than that of the second shell portion; a handle installation area is provided on the first shell portion, and a second wiring groove is also provided on the first shell portion located around the handle installation area, and the second wire portion is located in the second wiring groove.

9. The small leakage protection circuit breaker according to claim 2, characterized in that: It also includes an electromagnetic release, and a first protrusion located above the electromagnetic release is arranged on the third shell; the first breakpoint includes a first moving contact and a first static contact, the first moving contact includes a fixed part and a trigger part, the fixed part is clamped on the first protrusion, and the trigger part extends toward the direction where the operating mechanism is located.

10. The small leakage protection circuit breaker according to any one of claims 1 or 2 or 3 or 4 or 5 or 7 or 8, characterized in that: The operating mechanism includes a contact support on which a driving column is arranged; the first breakpoint includes a first moving contact and a first static contact, the first moving contact is located near the driving column, and when the operating mechanism is in a closed state, the first moving contact is connected to the first static contact under the pressure of the driving column.

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