Leakage circuit breaker

Abstract

This invention discloses a residual current circuit breaker (RCCB), relating to the field of circuit breakers. It includes a housing and an operating mechanism located on the L-pole side of the housing. The operating mechanism includes a contact support and a latch. On the N-pole side of the housing, there is an electronic trip unit and a swing-mounted swing rod. One end of the swing rod contacts the output terminal of the electronic trip unit. A linkage rod connects the latch and the other end of the swing rod, with the connection point between the linkage rod and the latch located on the lower right side of the latch to ensure a continuous force on the swing rod during closing. This invention has the advantages of fast response, simplified structure, and stable operation.

Description

Technical Field

[0001] This invention relates to the field of circuit breakers, and more specifically to residual current circuit breakers. Background Technology

[0002] Existing residual current circuit breakers, such as the magnetic flux trip reset structure and circuit breaker disclosed in CN217333982U on August 30, 2022, disclose a magnetic flux trip device and a reset mechanism. The reset mechanism includes a lever, a reset elastic element, and a push rod, which are pivotally mounted. The push rod cooperates with the circuit breaker's operating mechanism and the magnetic flux trip device. When the magnetic flux trip device is activated, the push rod is driven to rotate by the top rod of the magnetic flux trip device, which in turn drives the operating mechanism to trip. After the circuit breaker trips and opens, the moving contact of the operating mechanism or the circuit breaker moves, driving the lever to rotate. The lever applies a force to the push rod through the reset elastic element, causing the push rod to rotate in the direction that resets the top rod. After the circuit breaker closes, the moving contact separates from the lever. Its structure is very complex, and the excessive number of parts makes the lead pin response insensitive. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a residual current circuit breaker with fast response speed, simple structure, and stable operation.

[0004] The technical solution adopted in this invention is a residual current circuit breaker, which includes a housing and an operating mechanism located on the L-pole side of the housing. The operating mechanism includes a contact support and a latch. The housing has an electronic trip unit and a swing rod mounted on the N-pole side. One end of the swing rod is in contact with the output end of the electronic trip unit. A linkage rod is provided between the latch and the other end of the swing rod to link the two. The connection between the linkage rod and the latch is located at the lower right side of the latch to ensure a continuous force on the swing rod when the circuit is closed.

[0005] The swing rod has an outwardly extending support plate at one end that contacts the linkage rod. The housing has a second elastic element at the bottom of the swing rod that abuts against the two.

[0006] The housing is provided with a movable contact on the N-pole side, which is linked to the operating mechanism. The operating mechanism also includes a lever mounted on the contact support. A connecting shaft is provided between the upper part of the movable contact and the upper end of the lever. A limiting shaft is provided at the lower end of the lever that passes through the housing. The movable contact is provided with a strip hole corresponding to the limiting shaft.

[0007] The inner wall of the housing is provided with a first elastic element, and the upper part of the moving contact is provided with an extension plate that extends outward and abuts against the first elastic element. The first elastic element is a double-headed torsion spring.

[0008] The housing has a stationary contact and a positioning groove adapted to the stationary contact at a position below the moving contact. The stationary contact is L-shaped.

[0009] The housing is further provided with a circuit board, a first wire clamp, a third conductive post communicating with the circuit board, and a third conductive element communicating with the first wire clamp on one side of the L pole. A slide rod is provided between the third conductive element and the third conductive post, which is slidably installed on the inner wall of the housing. One end of the slide rod is in support contact with the contact and the other end is in elastic contact with the third conductive element. The slide rod is supported by the contact and slid to realize the connection between the third conductive element and the third conductive post.

[0010] The third conductive element is a torsion spring. One end of the slide rod is provided with a baffle that contacts the side wall of the contact support, and the other end of the slide rod is provided with a hook that hooks onto one end of the torsion spring.

[0011] The housing has a second wire clamp and a first mounting slot for installing the electronic trip unit on the N side. The swing rod rotates inside the housing and is located on the left side of the electronic trip unit. One end of the swing rod extends downward to the electronic trip unit, and the other end of the swing rod extends upward and its support plate passes through the inner wall of the housing and enters the L side.

[0012] A wire assembly is provided between the moving contact and the second wire clamp to connect the two. The wire assembly includes a copper plate and copper wire bundles connected to both ends of the copper plate. The inner wall of the housing is provided with a limiting groove to restrict the displacement of the copper plate. The beneficial effects of this invention are: when leakage occurs, the output end of the electronic trip unit will extend to contact the swing rod, and the swing rod will then drive the latch to act through the linkage rod, thereby achieving the purpose of leakage tripping. The whole structure is very simple, and the latch always applies force to the swing rod through the linkage rod when closing the circuit. When the output end of the electronic trip unit pushes the swing rod, it can achieve the first-time reaction action, which has the advantages of fast response speed, simple structure and stable operation. Attached Figure Description Figure 1 This is a schematic diagram of the residual current circuit breaker according to an embodiment of the present invention.

[0013] Figure 2 for Figure 2 This is a schematic diagram of the N-pole side of the casing.

[0014] Figure 3 This is a schematic diagram of the structure when the second line on the L-pole side of the casing is disconnected.

[0015] Figure 4 This is a schematic diagram of the internal structure of a residual current circuit breaker.

[0016] Figure 5 This is a structural diagram of the operating mechanism and the moving contact.

[0017] Figure 6 This is a structural diagram of the operating mechanism and slide bar.

[0018] Figure 7 This is a structural diagram of the swing arm, electronic release mechanism, and latch. Detailed Implementation

[0019] The embodiments of the present invention will be further described below with reference to the accompanying drawings: As shown in the figure, the residual current circuit breaker includes a housing 1 and an operating mechanism located on the L-pole side of the housing 1. The operating mechanism includes a contact support 2 and a latch 36. The housing 1 has an electronic trip unit 3 and a swing rod 4 mounted on the N-pole side. One end of the swing rod 4 contacts the output end of the electronic trip unit 3. A linkage rod 5 is provided between the latch 36 and the other end of the swing rod 4 to link the two. The connection between the linkage rod 5 and the latch 36 is located on the lower right side of the latch 36 to ensure a continuous force on the swing rod 4 when the circuit is closed. In this technical solution, when a leakage occurs, the output end of the electronic trip unit will extend and contact the swing rod. The swing rod then drives the latch to move through the linkage rod, achieving the purpose of leakage tripping. The whole structure is very simple. Moreover, the latch always applies force to the swing rod through the linkage rod when the circuit is closed. When the output end of the electronic trip unit pushes the swing rod, it can achieve a first-time reaction action, which has the advantages of fast response speed, simple structure, and stable operation.

[0020] The swing rod 4 has an outwardly extending support plate 6 at one end that contacts the linkage rod 5. The support plate can hold the linkage rod and prevent it from detaching from the swing rod after the action is completed, which greatly improves the working stability. The housing 1 has a second elastic element 7 at the bottom of the swing rod 4 to abut against the two. The second elastic element is a spring. This spring does not play a restoring role. The swing rod is rotatably installed in the housing. If there are burrs on both, the elastic preload of the spring can make the two rotate more smoothly.

[0021] The housing 1 also has a movable contact 8 on the N-pole side, which is linked to the operating mechanism. The operating mechanism also includes a lever 9 mounted on the contact support 2. A connecting shaft 10 is provided between the upper end of the movable contact 8 and the upper end of the lever 9. A limiting shaft 11 passing through the housing 1 is provided at the lower end of the lever 9. The movable contact 8 has a strip hole 12 corresponding to the limiting shaft 11. When the upper end of the lever rotates, it drives the movable contact to rotate synchronously through the connecting shaft. Compared with the existing structure, it has the advantage of faster response. The lower end of the lever is stationary. The cooperation between the limiting shaft and the strip hole can generate overtravel.

[0022] The inner wall of the housing 1 is provided with a first elastic element 13, and the upper part of the moving contact 8 is provided with an extension plate 14 that extends outward and abuts against the first elastic element 13. The first elastic element 13 is a double-headed torsion spring. The double-headed torsion spring presses down on the extension plate of the moving contact to prevent the moving contact from moving up and down and to ensure uniform force distribution.

[0023] The housing 1 has a stationary contact 16 and a positioning groove 15 adapted to the stationary contact 16 at a position below the moving contact 8. The stationary contact 16 is L-shaped. The stationary contact is installed in the housing in this way, which will have a better fixing effect.

[0024] On one side of the housing 1, there is a circuit board 21, a first wire clamp 17, a third conductive post 22 connected to the circuit board 21, and a third conductive element 23 connected to the first wire clamp 17. A slide rod 24 is provided between the third conductive element 23 and the third conductive post 22, which is slidably installed on the inner wall of the housing 1. One end of the slide rod 24 contacts the contact support 2, and the other end is in elastic contact with the third conductive element 23. The slide rod 24 is driven by the contact support 2 to slide, thereby realizing the connection between the third conductive element 23 and the third conductive post 22. The connection of the electric post 22; the third conductive element 23 adopts a torsion spring, and one end of the slide rod 24 is provided with a baffle 25 that contacts the side wall of the contact support 2. The other end of the slide rod 24 is provided with a hook part 26 that hooks one end of the torsion spring. When the circuit is closed, the contact support rotates and drives the slide rod to slide. The hook part of the slide rod can drive the third conductive element to contact the third conductive post. When the leakage current trips, the contact support cancels the force on the slide rod, and then the elastic preload of the third conductive element itself overcomes the resistance of the slide rod and thus disengages from the third conductive post.

[0025] The housing 1 has a second wire clamp 37 and a first mounting slot 38 for installing the electronic trip unit 3 on the N-pole side. The swing rod 4 rotates inside the housing and is located on the left side of the electronic trip unit 3. One end of the swing rod 4 extends downward to the electronic trip unit 3, and the other end of the swing rod 4 extends upward and its support plate 6 passes through the inner wall of the housing 1 and enters the L-pole side. In this technical solution, by reasonably arranging the internal components, the original 3P+N product has a thickness of 4*18=72mm. Through reasonable arrangement, the existing 3P+N can be made to have a thickness of 3*18=54mm, which can achieve the original function. A wire assembly is provided between the moving contact 8 and the second wire clamp 37 to connect the two. The wire assembly includes a copper plate 18 and copper wire bundles 19 connected to both ends of the copper plate 18. The inner wall of the housing 1 is provided with a limiting groove 20 to restrict the displacement of the copper plate 18. When the moving contact is subjected to force, the final pressure and overtravel are limited. The housing restricts the copper plate, so the final pressure and overtravel are fixed.

[0026] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] Please note to all technical personnel: Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of protection of this patent.

Claims

1. A residual current circuit breaker, comprising a housing (1) and an operating mechanism located on the L-pole side of the housing (1), the operating mechanism comprising a contact support (2) and a latch (36), characterized in that: The housing (1) has an electronic trip unit (3) and a swing rod (4) mounted on the N side. One end of the swing rod (4) is in contact with the output end of the electronic trip unit (3). A linkage rod (5) is provided between the latch (36) and the other end of the swing rod (4) to link the two. The connection between the linkage rod (5) and the latch (36) is located at the lower right side of the latch (36) to ensure the continuous force on the swing rod (4) when the circuit is closed.

2. The residual current circuit breaker according to claim 1, characterized in that: The swing rod (4) has an outwardly extending support plate (6) at one end of the linkage rod (5) for supporting the linkage rod (5).

3. The residual current circuit breaker according to claim 1, characterized in that: The housing (1) has a second elastic element (7) at the bottom of the swing rod (4) that abuts against the two.

4. The residual current circuit breaker according to claim 2, characterized in that: The housing (1) is provided with a movable contact (8) on the N pole side, which is linked to the operating mechanism. The operating mechanism also includes a lever (9) mounted on the contact support (2). A connecting shaft (10) is provided between the upper part of the movable contact (8) and the upper part of the lever (9). A limiting shaft (11) passing through the housing (1) is provided at the lower end of the lever (9). The movable contact (8) is provided with a strip hole (12) corresponding to the limiting shaft (11).

5. The residual current circuit breaker according to claim 4, characterized in that: The inner wall of the housing (1) is provided with a first elastic element (13), and the upper part of the moving contact (8) is provided with an extension plate (14) that extends outward and abuts against the first elastic element (13). The first elastic element (13) is a double-headed torsion spring.

6. The residual current circuit breaker according to claim 4, characterized in that: The housing (1) has a stationary contact (16) and a positioning groove (15) adapted to the stationary contact (16) at a position below the moving contact (8). The stationary contact (16) is L-shaped.

7. The residual current circuit breaker according to claim 1, characterized in that: The housing (1) is further provided with a circuit board (21), a first wire clamp (17), a third conductive post (22) connected to the circuit board (21), and a third conductive element (23) connected to the first wire clamp (17) on one side of the L pole. A slide rod (24) is provided between the third conductive element (23) and the third conductive post (22) and is slidably installed on the inner wall of the housing (1). One end of the slide rod (24) is in contact with the contact support (2) and the other end is in elastic contact with the third conductive element (23). The slide rod (24) is driven by the contact support (2) to slide and realize the connection between the third conductive element (23) and the third conductive post (22).

8. The residual current circuit breaker according to claim 7, characterized in that: The third conductive element (23) is a torsion spring. One end of the slide rod (24) is provided with a baffle (25) that contacts the side wall of the contact support (2). The other end of the slide rod (24) is provided with a hook (26) that hooks one end of the torsion spring.

9. The residual current circuit breaker according to claim 4, characterized in that: The housing (1) has a second wire clamp (37) and a first mounting groove (38) for installing the electronic trip unit (3) on one side of the N pole. The swing rod (4) rotates inside the housing and is located on the left side of the electronic trip unit (3). One end of the swing rod (4) extends to the bottom of the electronic trip unit (3), and the other end of the swing rod (4) extends upward and its support plate (6) passes through the inner wall of the housing (1) and enters the L pole side.

10. The residual current circuit breaker according to claim 9, characterized in that: A wire assembly is provided between the moving contact (8) and the second wire clamp (37) to connect the two. The wire assembly includes a copper plate (18) and copper wire bundles (19) connected to both ends of the copper plate (18). The inner wall of the housing (1) is provided with a limiting groove (20) to restrict the displacement of the copper plate (18).

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