A circuit breaker

Abstract

The present invention provides a circuit breaker, including a contact mechanism, a circuit board and an operating mechanism, wherein the circuit board draws electricity through a conductive plate; the operating mechanism includes a contact bracket and a first torsion spring, a moving contact is mounted on the contact bracket, the first torsion spring includes a first torsion spring body, a first elastic arm and a second elastic arm, the second elastic arm is provided with a first contact portion that contacts or separates from the conductive plate, wherein when the circuit breaker is in an open state, the first contact portion is separated from the conductive plate, and the circuit board is in a power-off state; when the circuit breaker is in a closed state, the first contact portion is in contact with the conductive plate, and the circuit board is in a power-on state. The inventor cleverly utilizes the first torsion spring in the prior art, and designs a first contact portion on the first torsion spring, so that the first torsion spring can also play the role of drawing electricity from the moving contact to the circuit board. Compared with the prior art, the number of parts is reduced, the structure is simpler, the assembly is faster and more convenient, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] The existing multifunctional circuit breaker is provided with a circuit board for detecting residual current, fault arc, overvoltage and undervoltage, etc. The circuit board draws power from the outlet or load end, and the power supply line of the circuit board loses or gains power following the opening and closing of the circuit breaker.

[0003] Chinese patent document CN213519824U discloses a circuit breaker, which includes a first terminal, a second terminal, an operating mechanism, a circuit board, a contact mechanism and an auxiliary contact mechanism, the circuit board draws power from the phase pole module through a first power supply line, the auxiliary contact mechanism includes a conductive element and an elastic conductive element, and the conductive element is electrically connected to the circuit board. The conductive plate as the conductive element body is installed in a fixed groove, the torsion spring as the elastic conductive element includes a twisted portion, and a first elastic arm and a second elastic arm extending outward from the twisted portion, respectively, the first elastic arm is electrically connected to the yoke of the short-circuit protection mechanism, the second elastic arm extends in the direction of the operating mechanism, and the second elastic arm is located at the lower side of one end of the conductive plate, and the operating mechanism for cooperating with the second elastic arm includes a contact support, and a protruding structure as a pressing portion is protruded on one side of the contact support close to the second elastic arm. When the circuit breaker is opened, the pressing part contacts the second elastic arm with the rotation of the contact support and separates the second elastic arm from the lower side of one end of the conductive plate by pressing, and the first power supply circuit is disconnected; when the circuit breaker is closed, the pressing part separates from the second elastic arm with the rotation of the contact support, and the second elastic arm contacts the lower side of one end of the conductive plate under the action of the torsion spring, and the first power supply circuit is connected. The auxiliary contact mechanism formed by the conductive plate and the torsion spring has a large number of parts and components, and the installation is relatively cumbersome; in addition, the auxiliary contact mechanism is installed between the handle and the short-circuit protection mechanism, which occupies a large space and increases the volume of the shell. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the auxiliary contact mechanism in the prior art, such as the large number of parts, complicated installation and large space occupation, so as to provide a circuit breaker with simple structure and compact layout.

[0005] To this end, the present invention provides a circuit breaker, including a contact mechanism, a circuit board and an operating mechanism, wherein the contact mechanism is arranged in a circuit breaker housing, and includes a movable contact and a static contact arranged opposite to each other; the circuit board is arranged in the circuit breaker housing and draws power through a conductive plate; the operating mechanism is arranged in the circuit breaker housing and is used to drive the movable contact to be in contact with or disconnected from the static contact, the operating mechanism includes a contact bracket and a first torsion spring, the movable contact is mounted on the contact bracket, the first torsion spring includes a first torsion spring body, and a first elastic arm and a second elastic arm extending outward from the first torsion spring body, the first elastic arm abuts against the movable contact, the second elastic arm abuts against the contact bracket, and the second elastic arm is provided with a first contact portion that contacts or separates from the conductive plate, wherein, when the circuit breaker is in an open state, the first contact portion is separated from the conductive plate, and the circuit board is in a power-off state; when the circuit breaker is in a closed state, the first contact portion contacts the conductive plate, and the circuit board is in a power-on state.

[0006] The conductive plate includes a conductive plate body, and a first conductive portion and a second conductive portion respectively arranged at two ends of the conductive plate body. The first conductive portion is connected to the circuit board through a wire, and the second conductive portion is in contact with or disconnected from the first contact portion.

[0007] The first contact portion is disposed at an end portion of the second elastic arm and is integrally bent and connected to the second elastic arm. The first contact portion extends along a width direction of the second conductive portion.

[0008] A short-circuit protection mechanism is arranged in the circuit breaker housing, and the conductive plate is arranged on a side of the contact support away from the short-circuit protection mechanism.

[0009] A leakage test assembly is provided above the conductive plate, and the leakage test assembly includes a leakage test button and a second torsion spring. The leakage test button is movably mounted on the circuit breaker housing and has an initial position and a test position; the second torsion spring includes a second torsion spring body, and a third elastic arm and a fourth elastic arm extending outward from the second torsion spring body, the third elastic arm is connected to one end of the circuit board, and the fourth elastic arm is abutted against the bottom of the leakage test button to drive the leakage test button to reset from the test position to the initial position, and a second contact portion is provided at the end of the fourth elastic arm to be in contact with or separated from the conductive plate, wherein when the leakage test button is in the test position, the second contact portion is in contact with the conductive plate, and the leakage test circuit where the second torsion spring is located is turned on.

[0010] A step is provided on the outer wall of the leakage test button, and a limit block corresponding to the step is provided on the inner wall of the circuit breaker housing, wherein when the leakage test button is in the initial position, the limit block abuts against the top of the step.

[0011] The first conductive part, the conductive plate body and the second conductive part are integrally bent and connected.

[0012] The circuit breaker housing is provided with a plurality of installation columns which are spaced apart and distributed along the direction in which the conductive plate body is arranged, and the installation columns are formed with first slots for the conductive plate body to be inserted into.

[0013] The contact support is provided with a first shaft, and the first torsion spring body and the moving contact are both sleeved on the first shaft.

[0014] A short circuit protection mechanism is arranged in the circuit breaker housing, and the circuit board and the arc extinguishing chamber are located below the short circuit protection mechanism, and a partition is arranged between the circuit board and the arc extinguishing chamber.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. In the circuit breaker provided by the present invention, the first torsion spring includes a first torsion spring body, and a first elastic arm and a second elastic arm extending outward from the first torsion spring body, the first elastic arm abuts against the moving contact, the second elastic arm abuts against the contact bracket, the first torsion spring can rotate with the contact bracket and the moving contact, and the second elastic arm is provided with a first contact portion that contacts or separates from the conductive plate, wherein when the circuit breaker is in an open state, the first contact portion is separated from the conductive plate, and the circuit board is in a power-off state; when the circuit breaker is in a closed state, the first contact portion contacts the conductive plate, and the circuit board draws power from the moving contact and is thus in a power-on state. It should be noted that, in the prior art, the first torsion spring is usually used to provide contact pressure between the moving contact and the static contact when the circuit breaker is closed. The inventor cleverly utilized the first torsion spring in the prior art and designed a first contact portion on the first torsion spring, so that the first torsion spring can also play the role of drawing power from the moving contact to the circuit board. Compared with the prior art method in which an auxiliary contact mechanism needs to be provided with another torsion spring, the number of parts is reduced, the structure is simpler, the assembly is faster and more convenient, and the production cost is reduced. In addition, the internal layout of the circuit breaker housing is made more compact, thereby realizing the miniaturization of the circuit breaker.

[0017] 2. The circuit breaker provided by the present invention has a leakage test assembly including a leakage test button and a second torsion spring, the second torsion spring including a second torsion spring body, and a third elastic arm and a fourth elastic arm extending outward from the second torsion spring body, the third elastic arm is connected to one end of the circuit board, the fourth elastic arm is against the bottom of the leakage test button, and is used to drive the leakage test button to reset from the test position to the initial position, and the end of the fourth elastic arm is provided with a second contact portion that is connected or separated from the conductive plate, wherein when the leakage test button is in the test position, the second contact portion contacts the conductive plate, and the leakage test circuit where the second torsion spring is located is turned on. In this way, the leakage test assembly also utilizes the conductive plate of the circuit board, the structure is simpler, and the production cost is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic structural diagram of a circuit breaker of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0021] Figure 3 It is a three-dimensional diagram of the contact support, the moving contact and the leakage test assembly;

[0022] Figure 4 It is a schematic diagram of the explosion structure of the contact bracket, the moving contact and the leakage test assembly;

[0023] Figure 5 It is a schematic diagram of the structure of the circuit breaker housing;

[0024] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part B;

[0025] Figure 7 This is a schematic diagram of the circuit breaker disassembly.

[0026] Explanation of the accompanying drawings: 1. contact mechanism; 2. circuit breaker housing; 3. moving contact; 4. static contact; 5. circuit board; 6. conductive plate; 7. operating mechanism; 8. contact bracket; 9. first torsion spring; 10. first torsion spring body; 11. first elastic arm; 12. second elastic arm; 13. first contact portion; 14. conductive plate body; 15. first conductive portion; 16. second conductive portion; 17. short-circuit protection mechanism; 18. leakage test assembly; 19. leakage test button; 20. second torsion spring; 21. second torsion spring body; 22. second contact portion; 23. third elastic arm; 24. fourth elastic arm; 25. step; 26. limit block; 27. mounting column; 28. first slot; 29. ​​first axis; 30. arc extinguishing chamber; 31. partition; 32. handle. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example

[0032] This embodiment provides a circuit breaker, such as Figure 1 and Figure 7 As shown, it includes a circuit breaker housing 2 , a contact mechanism 1 , a circuit board 5 , an operating mechanism 7 and a leakage test assembly 18 .

[0033] Circuit breaker housing 2, such as Figure 7 As shown, a short-circuit protection mechanism 17 is provided, and the circuit board 5 and the arc extinguishing chamber 30 are located below the short-circuit protection mechanism 17 , and a partition plate 31 is provided between the circuit board 5 and the arc extinguishing chamber 30 .

[0034] The contact mechanism 1 is arranged in the circuit breaker housing 2, such as Figure 1 As shown, it includes a moving contact 3 and a stationary contact 4 which are arranged opposite to each other.

[0035] The circuit board 5 is arranged in the circuit breaker housing 2 and is powered by the conductive plate 6. The conductive plate 6 is arranged on the side of the contact support 8 away from the short circuit protection mechanism 17. Figure 2 , Figure 3 and Figure 4 As shown, it includes a conductive plate body 14, and a first conductive portion 15 and a second conductive portion 16 respectively disposed at both ends of the conductive plate body 14. The first conductive portion 15 is connected to the circuit board 5 through a wire, and the second conductive portion 16 is in contact with or disconnected from the first contact portion 13. The first conductive portion 15, the conductive plate body 14 and the second conductive portion 16 are connected in an integral manner. Figure 6 As shown, the circuit breaker housing 2 is provided with a plurality of mounting posts 27 spaced apart along the direction in which the conductive plate body 14 is arranged, and the mounting posts 27 are formed with first slots 28 for the conductive plate body 14 to be inserted into.

[0036] The operating mechanism 7 is arranged in the circuit breaker housing 2 and is used to drive the moving contact 3 to be in contact with or disconnected from the static contact 4. The operating mechanism 7 includes a contact support 8 and a first torsion spring 9. The moving contact 3 is mounted on the contact support 8. Figure 3 and Figure 4As shown, the first torsion spring 9 includes a first torsion spring body 10, and a first elastic arm 11 and a second elastic arm 12 extending outward from the first torsion spring body 10, the first elastic arm 11 abuts against the moving contact 3, the second elastic arm 12 abuts against the contact bracket 8, and the second elastic arm 12 is provided with a first contact portion 13 that contacts or separates from the conductive plate 6. In this embodiment, the contact bracket 8 is provided with a first shaft 29, and the first torsion spring body 10 and the moving contact 3 are both sleeved on the first shaft 29. When the circuit breaker is in the open state, the first contact portion 13 is separated from the conductive plate 6, and the circuit board 5 is in the power-off state; when the circuit breaker is in the closed state, the first contact portion 13 contacts the conductive plate 6, and the circuit board 5 is in the power-on state. In this embodiment, the first contact portion 13 is disposed at the end of the second elastic arm 12 and is integrally bent and connected to the second elastic arm 12 . The first contact portion 13 extends along the width direction of the second conductive portion 16 , thereby increasing the contact area between the first contact portion 13 and the second conductive portion 16 .

[0037] The leakage test assembly 18 is arranged above the conductive plate 6. Figure 3 and Figure 4 As shown, the leakage test assembly 18 includes: a leakage test button 19, which is movably mounted on the circuit breaker housing 2 and has an initial position and a test position; a second torsion spring 20, which includes a second torsion spring body 21, and a third elastic arm 23 and a fourth elastic arm 24 extending outward from the second torsion spring body 21, wherein the third elastic arm 23 is connected to one end of the circuit board 5, and the fourth elastic arm 24 is abutted against the bottom of the leakage test button 19 to drive the leakage test button 19 to reset from the test position to the initial position, and the end of the fourth elastic arm 24 is provided with a second contact portion 22 that is in contact with or separated from the conductive plate 6, wherein when the leakage test button 19 is in the test position, the second contact portion 22 is in contact with the conductive plate 6, and the leakage test circuit where the second torsion spring 20 is located is turned on. As shown Figure 4 , Figure 5 and Figure 6 As shown, a step 25 is provided on the outer wall of the leakage test button 19, and a limit block 26 corresponding to the step 25 is provided on the inner wall of the circuit breaker housing 2, wherein when the leakage test button 19 is in the initial position, the limit block 26 abuts against the top of the step 25.

[0038] It should be noted that the short-circuit protection mechanism 17 and the operating mechanism 7 are existing mature technologies, so their specific structures and working principles are not described in detail.

[0039] The working principle of the circuit breaker of the present invention is as follows:

[0040] When the circuit breaker is in Figure 1 and Figure 2 In the open state shown, the first contact portion 13 of the first torsion spring 9 and the second conductive portion 16 of the conductive plate 6 are in a separated and disconnected state;

[0041] When the circuit breaker is closed, the contact bracket 8 rotates clockwise under the drive of the handle 32, and the moving contact 3 and the first torsion spring 9 also rotate clockwise along with the contact bracket 8. When the moving contact 3 is in contact with the static contact 4, the first contact portion 13 of the first torsion spring 9 is in contact with the second conductive portion 16, so that the circuit board 5 draws power from the moving contact 3 through the first torsion spring 9.

[0042] In the circuit breaker provided by the present invention, the first torsion spring in the prior art is usually used to provide contact pressure between the moving contact and the static contact when the circuit breaker is closed. The inventor cleverly utilizes the first torsion spring 9 in the prior art and designs a first contact portion 13 on the first torsion spring 9, so that the first torsion spring 9 can also play the role of taking power from the moving contact 3 to the circuit board 5. Compared with the method in the prior art that an auxiliary contact mechanism needs to be provided with another torsion spring, the number of parts is reduced, the structure is simpler, the assembly is faster and more convenient, and the production cost is reduced. In addition, the internal layout of the circuit breaker housing is made more compact, thereby realizing the miniaturization of the circuit breaker.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A circuit breaker, characterized in that: include: A contact mechanism (1) is arranged in a circuit breaker housing (2), and comprises a moving contact (3) and a stationary contact (4) arranged opposite to each other; A circuit board (5) is arranged in the circuit breaker housing (2) and is powered by a conductive plate (6), wherein the conductive plate (6) comprises a conductive plate body (14), and a first conductive portion (15) and a second conductive portion (16) respectively arranged at two ends of the conductive plate body (14), wherein the first conductive portion (15) is connected to the circuit board (5) via a wire; An operating mechanism (7) is arranged in the circuit breaker housing (2) and is used to drive the moving contact (3) to be in contact with or to be separated from the stationary contact (4). The operating mechanism (7) comprises a contact support (8) and a first torsion spring (9). The moving contact (3) is mounted on the contact support (8). The first torsion spring (9) comprises a first torsion spring body (10), and a first elastic arm (11) and a second elastic arm (12) extending outward from the first torsion spring body (10). The first elastic arm (11) is connected to the moving contact. The second elastic arm (12) abuts against the contact head (3), the second elastic arm (12) abuts against the contact bracket (8), the second elastic arm (12) is provided with a first contact portion (13) that contacts or separates from the second conductive portion (16) of the conductive plate (6), wherein when the circuit breaker is in an open state, the first contact portion (13) is separated from the conductive plate (6), and the circuit board (5) is in a power-off state; when the circuit breaker is in a closed state, the first contact portion (13) contacts the conductive plate (6), and the circuit board (5) is in a power-on state; The circuit breaker housing (2) is provided with a plurality of installation columns (27) spaced apart along the direction in which the conductive plate body (14) is arranged, and the installation columns (27) are formed with first slots (28) for the conductive plate body (14) to be inserted.

2. The circuit breaker according to claim 1, characterized in that: The first contact portion (13) is provided at the end of the second elastic arm (12) and is integrally bent and connected to the second elastic arm (12); the first contact portion (13) extends along the width direction of the second conductive portion (16).

3. The circuit breaker according to claim 1, characterized in that: A short circuit protection mechanism (17) is provided in the circuit breaker housing (2), and the conductive plate (6) is arranged on a side of the contact support (8) away from the short circuit protection mechanism (17).

4. The circuit breaker according to any one of claims 1 to 3, characterized in that: A leakage test assembly (18) is provided above the conductive plate (6), and the leakage test assembly (18) comprises: A leakage test button (19) is movably mounted on the circuit breaker housing (2) and has an initial position and a test position; The second torsion spring (20) comprises a second torsion spring body (21), and a third elastic arm (23) and a fourth elastic arm (24) extending outward from the second torsion spring body (21), wherein the third elastic arm (23) is connected to one end of the circuit board (5), and the fourth elastic arm (24) abuts against the bottom of the leakage test button (19) to drive the leakage test button (19) to reset from the test position to the initial position, and the end of the fourth elastic arm (24) is provided with a second contact portion (22) that is in contact with or separated from the conductive plate (6), wherein when the leakage test button (19) is in the test position, the second contact portion (22) is in contact with the conductive plate (6), and the leakage test circuit where the second torsion spring (20) is located is turned on.

5. The circuit breaker according to claim 4, characterized in that: A step (25) is provided on the outer wall of the leakage test button (19), and a limit block (26) corresponding to the step (25) is provided on the inner wall of the circuit breaker housing (2), wherein when the leakage test button (19) is in the initial position, the limit block (26) abuts against the top of the step (25).

6. The circuit breaker according to claim 1, characterized in that: The first conductive portion (15), the conductive plate body (14) and the second conductive portion (16) are integrally bent and connected.

7. The circuit breaker according to claim 1, characterized in that: The contact support (8) is provided with a first shaft (29), and the first torsion spring body (10) and the moving contact (3) are both sleeved on the first shaft (29).

8. The circuit breaker according to claim 1, characterized in that: A short circuit protection mechanism (17) is provided in the circuit breaker housing (2), as well as the circuit board (5) and the arc extinguishing chamber (30) located below the short circuit protection mechanism (17), and a partition plate (31) is provided between the circuit board (5) and the arc extinguishing chamber (30).

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