An electrical leakage circuit breaker

Abstract

The application discloses a leakage circuit breaker and relates to the field of circuit breakers, which comprises a shell and an operating mechanism located at one side of the shell L pole, wherein the operating mechanism comprises a contact support, a wire clamp is arranged on one side of the shell, a movable contact connected with the operating mechanism in linkage, a test button movably arranged and a first line for contacting the test button are arranged on one side of the shell N pole, a rotating block is rotatably arranged on one side of the movable contact, the movable contact drives the rotating block to rotate when closing, and the test button is pressed to realize circuit connection of the first line, a circuit board and a second line connected with the circuit board are further arranged on one side of the shell L pole, a sliding rod is slidably arranged on the shell and contacts the contact support, and the contact support drives the circuit connection of the second line through the sliding rod when the contact support is in action. The application has the advantages of good safety and reliable work.

Description

Technical Field

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

[0002] The existing residual current circuit breaker, such as the residual current circuit breaker with publication number CN206148380U disclosed on 2017.05.03, is a residual current circuit breaker that can be connected in both directions. In normal operation: the power supply of the test button circuit is: 631 is the L pole power supply and 633 is the N pole power supply. The power supply for the leakage circuit board circuit is as follows: 632 becomes the L pole power supply (621 and 631 are in contact after the switch is closed), and 633 is the N pole power supply; that is to say, the experimental button and the N pole of the circuit board share 633. When the product's leakage current trips, it simultaneously cuts off the power supply to the experimental button and the L terminal of the circuit board.

[0003] When reversing the wiring: Experimental button circuit power supply: 633 becomes the L-pole power supply, and 631 becomes the N-pole power supply; The working power supply for the leakage circuit board is as follows: 632 is the L-pole power supply (provided that the test button is pressed to make 622 and 633 come into contact), and 631 is the N-pole power supply.

[0004] For 1p+n leakage current products, with this implementation method, when the product's leakage current is disconnected, it is equivalent to disconnecting the L phase of the circuit board when the wiring is normal, and disconnecting the N phase when the wiring is reversed.

[0005] Problems exist: (I) 1. When the wiring is reversed, the L terminal of the circuit board cannot receive power (the test button cannot be held down continuously). Moreover, if the test button is held down, leakage current will be generated in the test button circuit as soon as the product is switched on, and the product will trip immediately. Both of these factors combined make the product unusable. In our conventional products, the power supply of the test button circuit and the circuit board's operating power supply must be separate. 2. When the test button is pressed, and the product's leakage is disconnected, the L terminal of the circuit board remains energized; only the N terminal is disconnected.

[0006] (II) There are two situations when reversing the wiring of 3P or 3P+n leakage current products: 1. When the test button is not connected, the L1, L2 and L3 poles of the circuit board cannot obtain power. In fact, it is impossible for the product to have a test button for each pole. Similarly, when the test button is pressed, the product may trip immediately and cannot be used normally. 2. Ignoring the issue of the circuit board power being obtained through the test button, the circuit board of multi-pole leakage current products is a three-phase power supply. When the product is reversed, even if the leakage current product trips and disconnects, the thyristor on the leakage current circuit board will remain in the conducting state. The circuit board will continue to supply power to the leakage current trip unit and burn out the trip unit. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention provides a residual current circuit breaker with good safety and reliable operation.

[0008] The technical solution adopted in this invention is as follows: A residual current circuit breaker includes a housing and an operating mechanism located on the L-pole side of the housing. The operating mechanism includes a contact support. A wire clamp is installed on one side of the housing. On the N-pole side of the housing, there is a moving contact that is linked to the operating mechanism, a movably installed test button, and a first circuit for contacting the test button. On the moving contact side of the housing, there is a rotating block that is rotatably installed. When the circuit is closed, the moving contact drives the rotating block to rotate and the test button is pressed down to connect the circuit of the first circuit. On the L-pole side of the housing, there is also a circuit board and a second circuit connected to the circuit board. A sliding rod that is slidably installed and in contact with the contact support is provided on the housing. When the contact support is activated, the sliding rod drives the circuit of the second circuit to connect.

[0009] The first circuit includes a first conductive post, a second conductive post, a first conductive element, and a second conductive element installed on the inner wall of the housing. The first conductive element is located between the first conductive post and the second conductive post. One end of the first conductive element elastically abuts against the second conductive post, and the other end elastically abuts against the rotating block. The second conductive element elastically abuts against the bottom of the test button.

[0010] One end of the rotating block is provided with a mounting groove for positioning the first conductive element, and the moving contact is provided with a transmission part that extends outward and contacts the other end of the rotating block.

[0011] The first and second conductive elements are torsion springs, and the first and second conductive pillars are hollow copper pillars. The inner wall of the housing is provided with mounting pillars for mounting the torsion springs and hollow copper pillars.

[0012] The second circuit includes a third conductive post connected to the circuit board and a third conductive element connected to the wire clamp. 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 moved to achieve the connection between the third conductive element and the third conductive post.

[0013] 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.

[0014] The operating mechanism also includes a lever mounted on the contact support. A connecting shaft is provided between the upper part of the moving contact and the upper end of the lever to connect the two. A limiting shaft passing through the housing is provided at the lower end of the lever. The moving contact is provided with a strip hole corresponding to the limiting shaft.

[0015] 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.

[0016] 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.

[0017] A wire assembly is provided between the moving contact and the 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 as follows: When the circuit is closed, the operating mechanism drives the moving contact to rotate clockwise, which in turn drives the rotating block to rotate and press the test button, thus enabling the first circuit to be connected. When the circuit trips due to leakage, the moving contact is driven to rotate counterclockwise by the operating mechanism, and the moving contact cancels the force on the rotating block, causing the rotating block to disengage from the first circuit and disconnecting the circuit. In addition, when the circuit is closed, the contact support of the operating mechanism can drive the sliding rod to move, thereby enabling the second circuit to be connected through the sliding rod. When the circuit trips due to leakage, the contact support cancels the force on the sliding rod, and the circuit of the second circuit is disconnected, thus realizing reverse wiring. It has the advantages of good safety and reliable operation.

[0018] The experimental button power circuit and the circuit board power circuit are separate, each performing its own function; For the experimental button circuit: the positive and negative wiring is achieved by connecting the N-pole moving contact with the rotating block to disconnect.

[0019] For circuit board circuits: By using the L-pole contact of the circuit breaker to support the linkage with the slide rod, the power supply of the circuit board 1P+N, 2P, 3P, and 3P+N can be physically isolated and disconnected regardless of the forward or reverse wiring, so that leakage current products can be connected in reverse. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the residual current circuit breaker according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure when the first line on the N-pole side of the casing is disconnected.

[0022] Figure 3 This is a schematic diagram of the structure when the first line on the N-pole side of the casing is connected.

[0023] Figure 4 This is a schematic diagram of the structure when the second line on the L-pole side of the casing is disconnected.

[0024] Figure 5 This is a structural diagram of the operating mechanism and the moving contact.

[0025] Figure 6This is a schematic diagram of the rotating block.

[0026] Figure 7 This is a schematic diagram of the contact support and the second circuit. Detailed Implementation

[0027] The embodiments of the present invention will be further described below with reference to the accompanying drawings: As shown in the figure, a 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. A wire clamp 17 is installed on one side of the housing 1. On the N-pole side of the housing 1, there is a moving contact 8 linked to the operating mechanism, a movably mounted test button 27, and a first circuit for contacting the test button. On the side of the moving contact 8 of the housing 1, there is a rotatably mounted rotating block 28. When the circuit is closed, the moving contact 8 drives the rotating block 28 to rotate, and the test button 27 is pressed down to connect the circuit of the first circuit. On the L-pole side of the housing 1, there is also a circuit board 21 and a second circuit connected to the circuit board. The housing has a sliding mounting mechanism that connects to the contact... The circuit supports a sliding rod with two contacts. When the contact is activated, the sliding rod connects the second circuit. When the circuit is closed, the operating mechanism rotates the moving contact clockwise, which in turn rotates the rotating block and presses the test button, thus connecting the first circuit. When a leakage current trips, the moving contact is rotated counterclockwise by the operating mechanism, releasing the force on the rotating block, causing it to disengage from the first circuit and disconnecting the circuit. Furthermore, when the circuit is closed, the contact of the operating mechanism can move the sliding rod, connecting the second circuit. When a leakage current trips, the contact releases the force on the sliding rod, disconnecting the second circuit. This allows for both forward and reverse wiring, offering advantages such as high safety and reliable operation.

[0028] The experimental button power circuit and the circuit board power circuit are separate, each performing its own function; For the experimental button circuit: the positive and negative wiring is achieved by connecting the N-pole moving contact with the rotating block to disconnect.

[0029] For circuit board circuits: By using the L-pole contact of the circuit breaker to support the linkage with the slide rod, the power supply of the circuit board 1P+N, 2P, 3P, and 3P+N can be physically isolated and disconnected regardless of the forward or reverse wiring, so that leakage current products can be connected in reverse.

[0030] The circuit breaker product in this embodiment is 3P+N.

[0031] The first circuit includes a first conductive post 29, a second conductive post 30, a first conductive element 31, and a second conductive element 32 installed on the inner wall of the housing 1. The first conductive element 31 is located between the first conductive post 29 and the second conductive post 30. One end of the first conductive element 31 elastically abuts against the second conductive post 30, and the other end elastically abuts against the rotating block 28. The second conductive element 32 elastically abuts below the test button 27. The first conductive element 31 and the second conductive element 32 are torsion springs. The first conductive post 29 and the second conductive post 30 are hollow copper posts. The inner wall of the housing 1 is provided with a torsion spring. The mounting post 35 is installed with a spring and a hollow copper column. One end of the rotating block 28 is provided with a mounting groove 33 for positioning the first conductive member 31. The moving contact 8 is provided with a transmission part 34 that extends outward and contacts the other end of the rotating block 28. When the circuit is closed, the moving contact rotates clockwise, and the transmission part applies a force to the rotating block and makes the rotating block rotate. The rotating block presses one end of the first conductive member onto the first conductive post. The other end of the first conductive member is in constant contact with the second conductive post. Then, by pressing the test button, the end of the second conductive member is pressed onto the second conductive post when the test button is pressed down, thereby realizing the connection of the first circuit.

[0032] The second circuit includes a third conductive post 22 connected to the circuit board 21 and a third conductive element 23 connected to the wire clamp 17. One end of the slide rod 24 contacts the contact support 2 and the other end elastically contacts 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. 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 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 circuit is tripped due to leakage, the contact support cancels the force on the slide rod. Then the elastic preload of the third conductive element itself overcomes the resistance of the slide rod and disengages from the third conductive post.

[0033] 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 is provided with 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.

[0034] 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.

[0035] 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.

[0036] A wire assembly is provided between the moving contact 8 and the wire clamp 17 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.

[0037] 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.

[0038] 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.

[0039] 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 including a contact support (2), and a wire clamp (17) mounted on one side of the housing (1), characterized in that: The housing (1) has a moving contact (8) connected to the operating mechanism, a test button (27) installed movably, and a first circuit for contacting the test button on one side of the N pole. The housing (1) has a rotating block (28) installed rotatably on one side of the moving contact (8). When the circuit is closed, the moving contact (8) drives the rotating block (28) to rotate and the test button (27) is pressed down to realize the circuit connection of the first circuit. The housing (1) also has a circuit board (21) and a second circuit connected to the circuit board (21) on one side of the L pole. The housing (1) has a sliding rod (24) installed and in contact with the contact support (2). When the contact support (2) is activated, the second circuit is connected through the sliding rod (24).

2. The residual current circuit breaker according to claim 1, characterized in that: The first circuit includes a first conductive post (29), a second conductive post (30), a first conductive element (31), and a second conductive element (32) installed on the inner wall of the housing (1). The first conductive element (31) is located between the first conductive post (29) and the second conductive post (30). One end of the first conductive element (31) elastically abuts against the second conductive post (30), and the other end elastically abuts against the rotating block (28). The second conductive element (32) elastically abuts against the test button (27) below.

3. The residual current circuit breaker according to claim 2, characterized in that: The rotating block (28) has a mounting groove (33) at one end for positioning the first conductive member (31), and the moving contact (8) has a transmission part (34) that extends outward and contacts the other end of the rotating block (28).

4. The residual current circuit breaker according to claim 2, characterized in that: The first conductive element (31) and the second conductive element (32) are torsion springs, the first conductive post (29) and the second conductive post (30) are hollow copper posts, and the inner wall of the housing (1) is provided with mounting posts (35) for mounting the torsion springs and hollow copper posts.

5. The residual current circuit breaker according to claim 1, characterized in that: The second line includes a third conductive post (22) connected to the circuit board (21) and a third conductive element (23) connected to the wire clamp (17). 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).

6. The residual current circuit breaker according to claim 5, 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.

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

8. The residual current circuit breaker according to claim 1, 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.

9. The residual current circuit breaker according to claim 1, 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.

10. The residual current circuit breaker according to claim 1, characterized in that: A wire assembly is provided between the moving contact (8) and the wire clamp (17) 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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