Leakage protection structure of circuit breaker

Abstract

An electric leakage protection structure of a circuit breaker comprises an electric leakage detection circuit board, the electric leakage detection circuit board is connected with a circuit of the circuit breaker and can detect the electric leakage condition of the circuit breaker, and a breakpoint structure is arranged in a circuit connection loop of the electric leakage detection circuit board and the circuit breaker. And the breakpoint structure is positioned on the lower side of a mechanism seat in the circuit breaker. According to the electric leakage protection structure, the breakpoint switch in the electric leakage circuit breaker is arranged below the mechanism seat, the handle is rotated to drive the mechanism seat to rotate, the mechanism seat drives the spring piece to rotate synchronously, and the spring piece makes contact with and is disconnected from the conductive column to achieve on-off of a circuit, so that interference to other parts in a mechanism assembly is avoided, and elastic contact is adopted; and the contact reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to a leakage protection structure of a circuit breaker. Background Art

[0002] A circuit board is usually arranged in a circuit breaker. The circuit board is connected to the circuit in the circuit breaker to detect the leakage current in the circuit, so as to realize the protection of the circuit. However, in the prior art, the circuit board in the circuit breaker product is usually directly connected to the circuit of the circuit breaker through wires or the like, and there is no switch or other structure. In such a connection mode, when the circuit breaker is tripped, that is, when the moving contact is separated from the static contact, the circuit board still has a loop with the L-pole and N-pole incoming and outgoing terminals of the circuit breaker. At this time, if a leakage or other situation occurs, the circuit board may be damaged, reducing the service life of the circuit board.

[0003] Chinese Patent No. 201721570131.9 discloses a loop break point structure of a leakage circuit breaker, which includes a handle and an operating mechanism. The handle and the operating mechanism are installed in the housing of the leakage circuit breaker and are connected in a linkage manner. A moving conductive rod is installed on the rocker arm of the operating mechanism, and a static conductive rod opposite to the moving conductive rod is installed in the housing. The moving conductive rod and the static conductive rod are connected in series in the leakage tripping loop and / or the test button loop in the leakage circuit breaker. The operating mechanism can drive the moving conductive rod to make the moving conductive rod contact or separate from the static conductive rod to form a break point. By connecting the moving conductive rod and the static conductive rod forming the break point structure in series into the leakage tripping loop or the test button loop in the leakage circuit breaker, an additional break point loop is added in the leakage circuit breaker, so as to ensure that the loop can be effectively cut off and the loop can be prevented from being damaged when a leakage signal appears, greatly improving the reliability and safety of the use of the leakage circuit breaker. However, the break point switch in this leakage circuit breaker is connected to the operating handle, which is prone to interference with other mechanisms and has poor reliability. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defect that the break point switch in the existing leakage circuit breaker is prone to interference with other mechanisms and has poor reliability. A leakage protection structure of a circuit breaker is provided. The break point switch in the leakage circuit breaker is arranged below the mechanism seat, avoiding interference with other components in the mechanism assembly and adopting elastic contact at the same time, improving the reliability of contact.

[0005] Technical Solution

[0006] To achieve the above technical objectives, the present utility model provides a leakage protection structure for a circuit breaker, which includes a leakage detection circuit board. The leakage detection circuit board is electrically connected to the circuit breaker to detect the leakage condition of the circuit breaker. A break point structure is provided in the electrical connection loop between the leakage detection circuit board and the circuit breaker. It is characterized in that: the break point structure is located on the lower side of the mechanism base inside the circuit breaker;

[0007] The break point structure includes an elastic member and a static conductive member. The elastic member is fixedly installed at the lower end of the mechanism base, and the static conductive member is fixed on the base. During the rotation of the mechanism base driven by the operating mechanism, the elastic member can rotate along with the mechanism base and then contact and separate from the static conductive member to form a break point.

[0008] In one embodiment, the elastic member is a spring piece. One end of a wire is fixedly connected to the spring piece, and the other end is connected to the leakage detection circuit board.

[0009] In one embodiment, the static conductive member is a contact torsion spring or a conductive post.

[0010] In one embodiment, a limit guiding portion is provided on the mechanism base to limit the position of the elastic member.

[0011] In one embodiment, the contact torsion spring is installed on a convex post on the base. The short end of the contact torsion spring corresponds to the spring piece, and the long end of the contact torsion spring is limited by a limit card slot on the base and connected to the leakage detection circuit board.

[0012] In one embodiment, the conductive post is provided on the base.

[0013] In one embodiment, the conductive post is connected to the leakage detection circuit board through a second wire.

[0014] Beneficial effects

[0015] The present utility model provides a leakage protection structure for a circuit breaker, which includes a leakage detection circuit board. The leakage detection circuit board is electrically connected to the circuit breaker to detect the leakage condition of the circuit breaker. A break point structure is provided in the electrical connection loop between the leakage detection circuit board and the circuit breaker. The break point structure is located on the lower side of the mechanism base inside the circuit breaker. The leakage protection structure arranges the break point switch in the leakage circuit breaker below the mechanism base. By rotating the handle to drive the rotation of the mechanism base, the mechanism base drives the spring piece to rotate synchronously. The contact and disconnection of the spring piece and the conductive post realize the on-off of the circuit, avoiding interference with other components in the mechanism assembly and adopting elastic contact at the same time, improving the reliability of the contact. Description of the drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0017] Attached Figure 1 is a schematic diagram of the break point structure when the circuit breaker is in the closing state in Embodiment 1 of the present utility model;

[0018] Attached Figure 2 is a schematic diagram of the break point structure when the circuit breaker is in the opening state in Embodiment 1 of the present utility model;

[0019] Attached Figure 3 is a schematic diagram of the mechanism seat structure in Embodiment 1 of the present utility model;

[0020] Attached Figure 4 is a schematic diagram of the installation of the spring piece in Embodiment 1 of the present utility model Figure 1 ;

[0021] Attached Figure 5 is a schematic diagram of the installation of the spring piece in Embodiment 1 of the present utility model Figure 2 ;

[0022] Attached Figure 6 is a schematic diagram of the base structure in Embodiment 1 of the present utility model;

[0023] Attached Figure 7 is a schematic diagram of the installation of the contact torsion spring in Embodiment 1 of the present utility model;

[0024] Attached Figure 8 is a schematic diagram of the break point structure when the circuit breaker is in the closing state in Embodiment 2 of the present utility model;

[0025] Attached Figure 9 is a schematic diagram of the break point structure when the circuit breaker is in the opening state in Embodiment 2 of the present utility model; Detailed implementation manners

[0026] To make the objectives, 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 accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0027] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are only for illustrative purposes and do not represent the only implementation.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the first feature can be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0031] Embodiment 1

[0032] The existing breakpoint switch of the leakage circuit breaker is prone to interference with other mechanisms and has poor reliability. To solve this problem, as shown in the appendix Figure 1 and 2As shown in the figure, this embodiment provides a leakage protection structure for a circuit breaker, which includes a leakage detection circuit board 1. The leakage detection circuit board 1 is electrically connected to the circuit breaker and can detect the leakage situation of the circuit breaker. A break point structure is provided in the circuit connection loop between the leakage detection circuit board 1 and the circuit breaker, and the break point structure is located on the lower side of the mechanism base 2 inside the circuit breaker. In this embodiment, the break point structure includes an elastic member 3 and a static conductive member 4. The elastic member 3 is fixedly installed at the lower end of the mechanism base 2, and the static conductive member 4 is fixed on the base 5. During the rotation of the mechanism base 2 driven by the operating mechanism 6, the elastic member 3 can rotate along with the mechanism base 2 and then contact and separate from the static conductive member 4 to form a break point.

[0033] As shown in the attached Figure 1 and 2 figures, specifically, the elastic member 3 is a spring piece. One end of the wire 7 is fixedly connected to the spring piece, and the other end is connected to the leakage detection circuit board 1. The static conductive member 4 is a contact torsion spring 4a. As shown in the attached Figure 3 , 4 and 5 figures, a limit guiding portion 201 is provided on the mechanism base 2 to limit the position of the spring piece. Specifically, the limit guiding portion 201 is an installation slot for fitting and installing the spring piece. The contact torsion spring 4a is installed on the convex column 501 on the base 5, and the short end of the contact torsion spring 4a corresponds to the spring piece. As shown in the attached Figure 6 and 7 figures, the long end of the contact torsion spring 4a is limited by the limit slot 502 on the base 5 and is connected to the leakage detection circuit board 1.

[0034] When the circuit breaker is closed, rotate the handle. The handle drives the mechanism base to synchronously drive the spring piece to rotate until the spring piece contacts the connection spring, and the circuit is connected.

[0035] When the circuit breaker is opened, rotate the handle. The handle drives the mechanism base to synchronously drive the spring piece to rotate in the reverse direction until the spring piece separates from the connection spring, and the circuit is disconnected.

[0036] Embodiment 2

[0037] As shown in the attached Figure 8 and 9 figures, in this embodiment, the static conductive member 4 is a conductive column 4b. The conductive column 4b is provided on the base 5. The conductive column 4b is connected to the leakage detection circuit board 1 through a wire 8. Other structures are the same as those in Embodiment 1.

[0038] When the circuit breaker is closed, rotate the handle. The handle drives the mechanism base to synchronously drive the spring piece to rotate until the spring piece contacts the conductive column 4b, and the circuit is connected.

[0039] When the circuit breaker is tripped, turn the handle. The handle drives the mechanism base to synchronously drive the spring piece to rotate in the reverse direction until the spring piece and the conductive column 4b separate, and the circuit is disconnected.

[0040] The utility model provides a leakage protection structure for a circuit breaker. The leakage protection structure arranges the break switch in the leakage circuit breaker below the mechanism base. By turning the handle to drive the mechanism base to rotate, the mechanism base drives the spring piece to rotate synchronously. The contact and disconnection of the spring piece and the conductive column realize the on-off of the circuit, avoiding interference with other components in the mechanism assembly and adopting elastic contact at the same time, improving the reliability of the contact.

[0041] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0042] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A leakage protection structure for a circuit breaker, comprising a leakage detection circuit board (1), wherein the leakage detection circuit board (1) is connected to a circuit of the circuit breaker to detect leakage of the circuit breaker, and a breakpoint structure is provided in the circuit connection loop between the leakage detection circuit board (1) and the circuit breaker, wherein: The breaking point structure is located on the lower side of the mechanism seat (2) inside the circuit breaker; The breakpoint structure comprises an elastic member (3) and a static conductive member (4); the elastic member (3) is fixedly mounted on the lower side end of the mechanism seat (2); the static conductive member (4) is fixed on a base (5); when the mechanism seat (2) is driven to rotate by the operating mechanism (6), the elastic member (3) can rotate along with the mechanism seat (2) and thus contact and separate from the static conductive member (4) to form a breakpoint.

2. The leakage protection structure of a circuit breaker according to claim 1, characterized in that: The elastic member (3) is a spring sheet, one end of a wire (7) is fixedly connected to the spring sheet, and the other end is connected to the leakage detection circuit board (1).

3. The leakage protection structure of a circuit breaker according to claim 1, characterized in that: The static conductive component (4) is a contact torsion spring (4a) or a conductive column (4b).

4. The leakage protection structure of a circuit breaker according to claim 1, characterized in that: A limiting guide portion (201) is provided on the mechanism seat (2) to limit the position of the elastic member (3).

5. The leakage protection structure of a circuit breaker according to claim 3, characterized in that: The contact torsion spring (4a) is mounted on a convex column (501) on the base (5); the short end of the contact torsion spring (4a) corresponds to the spring sheet; the long end of the contact torsion spring (4a) is limited by a limit slot (502) on the base (5) and connected to the leakage detection circuit board (1).

6. The leakage protection structure of a circuit breaker according to claim 3, characterized in that: The conductive column (4b) is arranged on a base (5).

7. A leakage protection structure for a circuit breaker according to claim 6, characterized in that: The conductive column (4b) is connected to the leakage detection circuit board (1) via a second conductor (8).

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