An electrical leakage circuit breaker

Abstract

The application discloses an electric leakage circuit breaker, which comprises a shell, an N-pole contact support, an L-pole contact support, a linkage column, a test structure, wherein the linkage column is arranged through the middle shell to connect the L-pole contact support and the N-pole contact support to make them linked together; the test structure is arranged in the N-pole chamber and comprises a test button, a moving spring, a first static vane and a second static vane; the first end of the moving spring is connected with the first static vane to form a first break point, and the second end of the moving spring is connected with the second static vane to form a second break point; the first end of the moving spring is located below the test button, and when the test button is pressed, the first end of the moving spring is in contact with the first static vane to make the first break point connected; the N-pole contact support is in contact with the moving spring, and when the N-pole contact support moves towards the closing direction, the second end of the moving spring is in contact with the second static vane to make the second break point connected; and the application has the characteristics of the test structure double break points.

Description

Technical Field

[0001] This application relates to the electrical field, specifically to a residual current circuit breaker. Background Technology

[0002] The test structure is mainly used in ground fault protection sockets and residual current circuit breakers. When the user presses it, the test circuit is connected to generate a simulated leakage current. The user can judge whether the product is damaged based on whether the product trips.

[0003] Common test structures are single-breakpoint structures, meaning that a breakpoint is formed at the test button, and the breakpoint is connected when the test button is pressed.

[0004] With the gradual development of this field, a double-breakpoint test structure has also emerged, which is equivalent to adding a breakpoint on the basis of a single breakpoint. The two breakpoints are connected in series, and the added breakpoint is controlled by the operating mechanism to achieve contact and separation, such as CN222672929U.

[0005] However, this type of double-break test structure is currently mainly used in DPN circuit breakers such as CN222672929U. In this type of circuit breaker, the L and N poles are located in the same housing, and the L and N pole contacts share a single contact support. The additional break point is achieved by using this contact support to make and break the circuit.

[0006] However, not all residual current circuit breakers (RCCBs) are DPN type. Some RCCBs have the L and N poles in separate spaces, and the contacts between the L and N poles are only linked, but do not share a single contact. Obviously, such an L and N pole arrangement cannot directly apply the double-break structure described above.

[0007] Therefore, how to set up a double-break test structure for this type of circuit breaker is a question worth considering. Summary of the Invention

[0008] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a residual current circuit breaker.

[0009] This application provides: a residual current circuit breaker, wherein, it includes, The outer casing has an L-pole chamber and an N-pole chamber, and the outer casing has an intermediate shell that separates the L-pole chamber and the N-pole chamber; The N-pole chamber is equipped with an N-pole contact and an N-pole contact support. The N-pole contact support is rotatably connected to the intermediate housing, and the N-pole contact is connected to the N-pole contact support. The L-pole cavity is equipped with an L-pole contact and an L-pole contact support. The L-pole contact support is rotatably connected to the intermediate housing, and the L-pole contact is connected to the L-pole contact support. The linkage column, which runs through the middle housing, connects the L-pole contact support and the N-pole contact support, enabling them to move together. The test structure, set in the N-pole chamber, includes a test button, a moving spring, a first stationary conductor, and a second stationary conductor; the first end of the moving spring forms a first break point with the first stationary conductor, and the second end of the moving spring forms a second break point with the second stationary conductor; The first end of the moving spring is located below the test button. When the test button is pressed down, the first end of the moving spring contacts the first stationary guide plate, thus connecting the first break point. The N-pole contact support abuts against the moving spring. When the N-pole contact support moves in the closing direction, the second end of the moving spring contacts the second stationary conductor, thus closing the second break.

[0010] In some embodiments of the application, a reset spring is also included. One end of the reset spring is connected to the test button, and the other end abuts against a static component in the N-pole cavity. The reset spring is used to provide a reset force for the test button after it is pressed. The moving spring itself is elastic. After the force from the test button is eliminated, the first end of the moving spring restores the first break point under its own elastic action.

[0011] In some embodiments of the application, the N-pole contact support is provided with a compression protrusion, and the moving spring itself is elastic. After the N-pole contact support moves toward the opening direction, the second end of the moving spring restores the second break point under its own elastic action.

[0012] In some embodiments of the application, the moving spring includes a first contact arm, a bending arm, and a second contact arm; the first contact arm and the second contact arm are connected by the bending arm, with the first end located on the first contact arm and the second end located on the second contact arm; the included angle between the first contact arm and the second contact arm is an acute angle.

[0013] In some embodiments of the application, in the length direction, the N-pole contact support has an overlapping portion with the second contact arm; in the height direction, the test button is at least partially located above the first contact arm, and the first contact arm is entirely located above the second contact arm.

[0014] In some embodiments of the application, the second stationary contact piece is disposed on the side of the second contact arm facing the first contact arm, and when the N-pole contact support moves in the closing direction, the second contact arm moves in the direction of the first contact arm, thereby contacting the second stationary contact piece.

[0015] In some embodiments of the application, a circuit board assembly is provided in the N-pole cavity, and the first static conductive plate has pins, which are fixed and electrically connected to the circuit board assembly by welding.

[0016] In some embodiments of the application, the intermediate housing has a first slot, and the first static guide plate is at least partially inserted into the first slot.

[0017] In some embodiments of the application, a first terminal board is provided in the L-electrode cavity, and the second static conductor is connected to the first terminal board by a soft conductor.

[0018] In some embodiments of the application, the intermediate housing has a limiting structure, and the second static guide plate is disposed in the limiting structure. The limiting structure has a disassembly port facing away from the L-pole cavity, and the disassembly port is used to disassemble and install the second static guide plate.

[0019] The advantages of this application compared to the prior art are: Linking the N-pole contact support and the L-pole contact support through a linkage column, and then using the N-pole contact support to drive the connection and disconnection of the second break point, can be applied to this type of non-DPN residual current circuit breaker and can also achieve the effect of reverse line input. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 An exploded view of a residual current circuit breaker according to an embodiment of this application is shown; Figure 2 The linkage structure between the L and N poles of the residual current circuit breaker according to an embodiment of this application is shown; Figure 3 A schematic diagram and a partial enlarged view of the N-pole structure of the residual current circuit breaker according to an embodiment of this application are shown; Figure 4 A schematic diagram of the test structure of the residual current circuit breaker according to an embodiment of this application is shown; Figure 5 A schematic diagram of the moving spring of the residual current circuit breaker according to an embodiment of this application is shown; Figure 6 This diagram shows a test structure of the residual current circuit breaker according to an embodiment of this application when both breakpoints are open. Figure 7 This diagram shows a test structure of the residual current circuit breaker according to an embodiment of the present application when the second break point is connected; Figure 8 A schematic diagram of the test structure of the residual current circuit breaker according to an embodiment of this application is shown when the first break point is connected. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0027] like Figures 1-8 As shown, an embodiment of this application is a residual current circuit breaker.

[0028] The residual current circuit breaker includes a housing, an L-pole structure, and an N-pole structure.

[0029] The outer casing includes a first casing 110, an intermediate casing 120, and a second casing 130. In the width direction, the first casing 110 and the second casing 130 are respectively joined to both sides of the intermediate casing 120. The first casing 110 and the intermediate casing 120 together form an L-polar chamber 100a, and the second casing 130 and the intermediate casing 120 together form an N-polar chamber 100b. In other words, the intermediate casing 120 divides the L-polar chamber 100a and the N-polar chamber 100b.

[0030] Here, the various shells of the outer casing are fastened together using a combination of rivets to form a complete whole.

[0031] The L-pole structure is disposed within the L-pole chamber 100a. The L-pole structure includes an L-pole moving contact 210, an L-pole moving contact, an L-pole contact support 220, an operating mechanism, etc.

[0032] The operating mechanism is connected to the L-pole contact support 220, and the L-pole moving contact is connected to the L-pole contact support 220. Driven by the operating mechanism, the L-pole moving contact rotates with the L-pole contact support 220 until it contacts the L-pole moving contact 210, thereby achieving the connection of the L-pole. Alternatively, the L-pole moving contact rotates with the L-pole contact support 220 until it moves away from the L-pole moving contact 210, thereby achieving the disconnection of the L-pole.

[0033] Here, the L-pole contact support 220 is rotatably connected to the intermediate housing 120 and the first housing 110 via a pin.

[0034] The N-pole structure is located within the N-pole chamber 100b and includes an N-pole stationary contact, an N-pole moving contact 230, an N-pole contact support 240, a zero-sequence current transformer, a circuit board assembly 300, and so on.

[0035] The N-pole moving contact 230 is connected to the N-pole contact support 240, and the N-pole contact support 240 is rotatably connected to the intermediate housing 120 and the second housing 130 via a pin.

[0036] Because the N-pole contact support 240 and the L-pole contact support 220 are linked by a linkage column 250 (penetrating the intermediate housing 120), the N-pole contact support 240 can also move in the closing direction or the opening direction under the drive of the operating mechanism. Specifically, the N-pole moving contact 230 moves with the N-pole contact support 240 until it contacts the N-pole stationary contact to realize the connection of the N-pole (movement in the closing direction), or the N-pole moving contact 230 rotates with the N-pole contact support 240 until it moves away from the N-pole stationary contact to realize the disconnection of the N-pole (movement in the opening direction).

[0037] The circuit board assembly 300 has an internal test circuit. The circuit principle of the test circuit is common knowledge in the field and will not be described in detail here. Only the mechanical switch of the test circuit (the inventive point of this application) will be described.

[0038] The test structure is set in the N-pole chamber 100b and includes a test button 310, a moving spring 320, a first stationary guide plate 330, and a second stationary guide plate 340.

[0039] The movable spring 320 is a conductive component with elasticity.

[0040] Test button 310 is located above the first end of moving spring 320.

[0041] The first stationary conductor 330 is located near the first end of the moving spring 320. When the test button 310 is not pressed, the first end of the moving spring 320 and the first stationary conductor 330 form a first break point K1. After the test button 310 is pressed, the first end of the moving spring 320 contacts the first stationary conductor 330, causing the first break point K1 to "disappear" (here, "disappear" means that the first break point K1 is no longer in an open circuit state, but in a closed circuit state).

[0042] The second stationary guide plate 340 is located near the second end of the moving spring 320.

[0043] The N-pole contact support 240 is located on one side of the moving spring 320, and the N-pole contact support 240 partially abuts against the moving spring 320. When the N-pole is in the open position and the N-pole contact support 240 has not moved in the closing direction, the second end of the moving spring 320 forms a second break point K2 with the second stationary conductor 340. When the operating mechanism drives the N-pole contact support 240 to move in the closing direction, the N-pole contact support 240 can push the moving spring 320, causing the second end of the moving spring 320 to contact the second stationary conductor 340, so that the first break point K1 "disappears" (here, "disappears" means that the second break point K2 is no longer in an open circuit state, but in a closed circuit state).

[0044] For the test button 310, it can be reset by the moving spring 320 or by an independent spring when the external force disappears.

[0045] In this embodiment, an independent spring reset is used, which allows the test button 310 to reset quickly. Specifically, a reset spring 350 is included, with one end of the reset spring 350 abutting against the test button 310 and the other end of the test button 310 abutting against a static component. When the user presses the button, the reset spring 350 compresses, and after the external force disappears, it can reset the test button 310. Because the moving spring 320 is elastic, after the force from the test button 310 is eliminated, the first end of the moving spring 320 restores the first break point K1 under its own elastic action. Here, the static component can be part of the intermediate housing 120, part of the second housing 130, or a stationary support disposed within the N-pole chamber 100b.

[0046] For the N-pole contact support 240, it has a pressing protrusion 240a extending toward the moving spring 320. The pressing protrusion 240a abuts against the moving spring 320. This structure facilitates the cooperation between the N-pole contact support 240 and the moving spring 320. Furthermore, since the moving spring 320 itself is elastic, after the N-pole contact support 240 moves toward the opening direction, the second end of the moving spring 320 restores the second break point K2 under its own elastic action.

[0047] The moving spring 320 includes a first contact arm 320a, a bending arm 320b, and a second contact arm 320c.

[0048] The first contact arm 320a and the second contact arm 320c are connected by a bent arm 320b. That is, the first end is located on the first contact arm 320a, and the second end is located on the second contact arm 320c. Here, the included angle between the first contact arm 320a and the second contact arm 320c is an acute angle, specifically a setting of 30°-60°. This design of the moving spring 320 results in a more compact structure and a smaller footprint.

[0049] Along the length direction L, the N-pole contact support 240 and the second contact arm 320c have an overlapping portion. Along the height direction H, the test button 310 is at least partially located above the first contact arm 320a, which is entirely located above the second contact arm 320c. This orientation arrangement makes the test structure and the N-pole contact support 240 more compact, saving as much space as possible inside the N-pole cavity.

[0050] Here, the second stationary conductor 340 is positioned on one side of the second contact arm 320c, specifically on the side where the second contact arm 320c faces the first contact arm 320a. Thus, when the N-pole contact support 240 moves in the closing direction, the second contact arm 320c moves towards the first contact arm 320a, meaning the distance between them gradually decreases (but does not reach contact), eventually leading to contact between the second contact arm 320c and the second stationary conductor 340. This arrangement is designed to minimize the overall space occupied by the test structure, conserving as much space as possible within the N-pole cavity.

[0051] Here, the first stationary conductor 330 has a pin 330a, which is directly soldered to the circuit board assembly 300 for fixation. Here, soldering not only fixes the first stationary conductor 330, but also allows the first stationary conductor 330 to be connected to the test circuit of the circuit board assembly 300.

[0052] In response, the intermediate housing 120 also has a first slot 120a, and the first static conductive piece 330 is welded into the first slot 120a. In this way, the intermediate housing 120 can also provide a certain degree of protection for the first static conductive piece.

[0053] The L-terminal structure also has a first terminal board 260, which is mainly used to connect the L-terminal structure to the load circuit.

[0054] The second stationary conductor 340 is welded to the first terminal plate 260 using a flexible connector 270, allowing the second stationary conductor 340 to draw power from the L pole. Here, the flexible connector 270 passes through the intermediate housing 120, and the flexible connector 270 can also be replaced with other flexible conductors, such as flexible wires, etc.

[0055] The intermediate housing 120 also has a limiting structure 120b for mounting the second stationary guide plate 340. Here, the limiting structure 120b is formed by multiple protrusions and has a disassembly / removal port 120c in the direction away from the L-pole cavity, through which the second stationary guide plate 340 is disassembled and installed. This limiting structure 120b ensures the stable placement of the second stationary guide plate 340.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A residual current circuit breaker, characterized in that: include, The outer casing has an L-pole chamber and an N-pole chamber, and the outer casing has an intermediate shell that separates the L-pole chamber and the N-pole chamber; The N-pole chamber is equipped with an N-pole contact and an N-pole contact support. The N-pole contact support is rotatably connected to the intermediate housing, and the N-pole contact is connected to the N-pole contact support. The L-pole cavity is equipped with an L-pole contact and an L-pole contact support. The L-pole contact support is rotatably connected to the intermediate housing, and the L-pole contact is connected to the L-pole contact support. The linkage column, which runs through the middle housing, connects the L-pole contact support and the N-pole contact support, enabling them to move together. The test structure, set in the N-pole chamber, includes a test button, a moving spring, a first stationary conductor, and a second stationary conductor; the first end of the moving spring forms a first break point with the first stationary conductor, and the second end of the moving spring forms a second break point with the second stationary conductor; The first end of the moving spring is located below the test button. When the test button is pressed down, the first end of the moving spring contacts the first stationary guide plate, thus connecting the first break point. The N-pole contact support abuts against the moving spring. When the N-pole contact support moves in the closing direction, the second end of the moving spring contacts the second stationary conductor, thus closing the second break.

2. A residual current circuit breaker according to claim 1, characterized in that: It also includes a reset spring, one end of which is connected to the test button and the other end of which abuts against a static component in the N-pole chamber. The reset spring is used to provide a reset force for the test button after it is pressed. The moving spring itself is elastic. After the force from the test button is eliminated, the first end of the moving spring restores the first break point under its own elastic action.

3. A residual current circuit breaker according to claim 1, characterized in that: The N-pole contact support is provided with a compression protrusion, and the moving spring itself is elastic. After the N-pole contact support moves toward the opening direction, the second end of the moving spring restores the second break point under its own elastic action.

4. A residual current circuit breaker according to claim 1, characterized in that: The moving spring includes a first contact arm, a bending arm, and a second contact arm; the first contact arm and the second contact arm are connected by the bending arm, with the first end located on the first contact arm and the second end located on the second contact arm; the included angle between the first contact arm and the second contact arm is an acute angle.

5. A residual current circuit breaker according to claim 4, characterized in that: In the length direction, the N-pole contact support has an overlapping portion with the second contact arm; in the height direction, the test button is at least partially located above the first contact arm, and the first contact arm is entirely located above the second contact arm.

6. A residual current circuit breaker according to claim 5, characterized in that: The second stationary contact piece is located on the side of the second contact arm facing the first contact arm. When the N-pole contact supports the movement in the closing direction, the second contact arm moves in the direction of the first contact arm, thereby contacting the second stationary contact piece.

7. A residual current circuit breaker according to claim 1, characterized in that: The N-pole cavity is equipped with a circuit board assembly, and the first stationary conductive plate has pins. The pins are fixed and electrically connected to the circuit board assembly by welding.

8. A residual current circuit breaker according to claim 7, characterized in that: The intermediate housing has a first slot, and the first static guide plate is at least partially inserted into the first slot.

9. A residual current circuit breaker according to claim 1, characterized in that: The L-type cavity is equipped with a first terminal board, and the second static conductor is connected to the first terminal board by a soft conductor.

10. A residual current circuit breaker according to claim 9, characterized in that: The intermediate housing has a limiting structure, and the second static guide plate is disposed in the limiting structure. The limiting structure has a disassembly port facing away from the L pole cavity. The disassembly port is used to disassemble and install the second static guide plate.

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