A leakage circuit breaker

Abstract

The present invention discloses a leakage circuit breaker, which relates to the technical field of circuit breakers, and includes a housing, on which an L-pole inlet and outlet wire post, an N-pole inlet and outlet wire post, a magnetic tripping mechanism, an operating mechanism, a thermal tripping mechanism and an arc extinguishing system are provided; wherein the operating mechanism is connected to one end of the tripping frame; the other end of the tripping frame is connected to the L-pole moving contact and the N-pole moving contact; a rotating wheel is located below the tripping frame, the rotating wheel is connected to one end of the moving contact compression spring, one side of the other end of the moving contact compression spring is connected to one end of the L-pole moving contact; the other side of the other end of the moving contact compression spring is connected to one end of the N-pole moving contact; the other end of the L-pole moving contact is in detachable contact with the L-pole static contact; the other end of the N-pole moving contact is in detachable contact with the N-pole static contact. Aiming at the technical problem that the circuit breaker in the prior art has incomplete arc extinguishing and forms a secondary arc, an arc extinguishing rib is provided at the N-pole, which optimizes the product space design and can effectively isolate and extinguish the arc.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a leakage circuit breaker. Background Art

[0002] RCBO circuit breakers are mechanical switch electrical appliances used to connect, carry and disconnect current under normal circuit conditions, and can disconnect contacts when the residual current reaches a specified value under specified conditions, and can connect and carry a certain time and automatically disconnect current under specified abnormal circuit conditions (such as short circuit). The existing RCBO circuit breaker L pole generally consists of a magnetic release device (including moving iron core, static iron core, iron core spring, magnetic yoke, static contact rod, electromagnetic coil, coil frame, coil, top rod and other parts), an operating mechanism (including handle, connecting rod, jumper, lock, release frame, lever, lock spring, contact spring, reset spring, moving contact, contact support), a thermal release device (including double metal, double metal support and other parts), an arc extinguishing system (including arc starting plate, arc isolation plate, magnetic plate, arc extinguishing chamber and other parts), a circuit board, and a mutual inductor; the N pole also has an arc extinguishing system (including arc starting plate, arc isolation plate, arc extinguishing chamber and other parts); but there is still a technical problem that the arc is not completely extinguished and secondary arcing is formed. Summary of the invention

[0003] 1. Technical problem to be solved by the invention

[0004] In view of the technical problem in the prior art that the circuit breaker has incomplete arc extinguishing and secondary arcing, the present invention provides a leakage circuit breaker which is provided with an arc extinguishing rib to effectively isolate and extinguish the arc.

[0005] 2. Technical solution

[0006] To solve the above problems, the technical solution provided by the present invention is:

[0007] A leakage circuit breaker comprises a shell, on which are provided an L-pole inlet and outlet post, an N-pole inlet and outlet post, a magnetic tripping mechanism, an operating mechanism, a thermal tripping mechanism and an arc extinguishing system; wherein the operating mechanism is connected to one end of the tripping frame; the other end of the tripping frame is connected to the L-pole moving contact and the N-pole moving contact; a rotating wheel is located below the tripping frame, the rotating wheel is connected to one end of the moving contact compression spring, one side of the other end of the moving contact compression spring is connected to one end of the L-pole moving contact; the other side of the other end of the moving contact compression spring is connected to one end of the N-pole moving contact; the other end of the L-pole moving contact is in detachable contact with the L-pole static contact; the other end of the N-pole moving contact is in detachable contact with the N-pole static contact; the arc extinguishing system comprises an arc extinguishing chamber and an arc extinguishing rib, the arc extinguishing chamber is used to eliminate the arc generated at the separation point of the L-pole static contact and the L-pole moving contact; the arc extinguishing rib is used to eliminate the arc generated at the separation point of the N-pole static contact and the N-pole moving contact The generated arc; the magnetic tripping mechanism includes a coil connected to the L-pole static contact, a moving iron core, a coil frame located in the coil, and a leakage coil located in the coil frame. Starting from one end of the leakage coil, the moving iron core, the coil compression spring and the top rod are arranged in sequence in the leakage coil, and the other end of the leakage coil is provided with a static iron core, and the static iron core is provided with a hole through which the top rod can pass; the leakage coil is connected to the output end of the circuit board, and the input end of the circuit board is connected to the output end of the magnetic ring; the L-pole wire, the N-pole wire and the wire of the testing mechanism all pass through the magnetic ring; the thermal tripping mechanism includes a bimetallic strip, one end of the bimetallic strip is connected to the L-pole moving contact through a copper wire one, and the other end of the bimetallic strip is connected to the L-pole wire through a copper wire two, and one end of the bimetallic strip is adjacent to the end plate at one end of the tripping rod and is provided with a gap; the other end of the tripping rod is connected to the tripping frame.

[0008] Optionally, the operating mechanism includes a handle, and a trip frame and a rotating wheel that are detachably engaged with each other, a handle torsion spring, a trip tension spring, a trip compression spring and a U-shaped rod; one end of the handle torsion spring is fixedly connected to the shell, the handle torsion spring body is assembled in the cylindrical hole at the center of the circular part of the handle, and the other end of the handle torsion spring is fixed on the surface of the circular part of the handle; one end of the U-shaped rod is inserted into the circular part of the handle, and the other end of the U-shaped rod is engaged with the trip frame and one end of the rotating wheel, the other end of the rotating wheel is connected to one end of the trip compression spring, and the other end of the trip compression spring is connected to the trip frame.

[0009] Optionally, a partition for isolating the circuit board is also included.

[0010] Optionally, the N-pole input and output terminals are located on the other side of the shell, and the N-pole input and output terminals include an N-pole output terminal and a terminal block four connected to the N-pole output terminal, and the N-pole output terminal and the terminal block four are both located at one end edge of the other side of the shell; the N-pole input and output terminals also include an N-pole input terminal and a terminal block three connected to the N-pole input terminal, and the N-pole input terminal and the terminal block three are both located at the other end edge of the other side of the shell.

[0011] Optionally, the thermal trip mechanism further includes a bimetallic support member for supporting the bimetallic strip, and the bimetallic strip is connected to the bimetallic support member; the other end of the bimetallic strip is adjacent to the adjusting screw.

[0012] Optionally, a testing mechanism is also included, which includes a test button, a test button compression spring, button rib piece 1 and button rib piece 2 connected to the L pole, and a test button torsion spring in contact with the test button compression spring; the test button torsion spring is fixed on the shell, the test button torsion spring is connected to the N pole, one end of the test button torsion spring is located at the bottom of the test button, and one end of the test button compression spring is located below the bottom of the test button; the other end of the test button compression spring is provided with button rib piece 1 and button rib piece 2.

[0013] Optionally, the L-pole input and output terminals are located on one side of the shell, and the L-pole input and output terminals include an L-pole input terminal located on the middle seat, and a terminal block 1 connected to the L-pole input terminal, and the middle seat and the terminal block 1 are both located at one end edge of one side of the shell; the L-pole input and output terminals also include an L-pole output terminal, and a terminal block 2 connected to the L-pole output terminal, and the L-pole output terminal and the terminal block 1 are both located at the other end edge of one side of the shell.

[0014] Optionally, the adjusting screw includes an adjusting bolt and an adjusting screw rod, one end of the bimetallic strip away from the copper wire is adjacent to the adjusting screw rod passing through the adjusting bolt, and the adjusting bolt is fixed on the housing.

[0015] Optionally, the arc extinguishing chamber and arc extinguishing ribs are respectively arranged on both sides of the shell, and the arc extinguishing ribs are connected to the shell; a fixing plate is provided on the shell at the L-pole static contact, and the fixing plate is connected to the arc extinguishing chamber.

[0016] Optionally, the other end of the rotating wheel is provided with a protrusion 1 matching with one end of the release compression spring, and the release frame is provided with a protrusion 2 matching with the other end of the release compression spring.

[0017] 3. Beneficial effects

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] (1) In an embodiment of the present application, an operating mechanism is actuated to drive a trip frame to actuate, and the trip frame actuates to drive a moving contact compression spring to actuate, thereby causing the L-pole moving contact to separate from or contact the L-pole static contact; the N-pole moving contact to separate from or contact the N-pole static contact, thereby realizing the closing or opening of the leakage circuit breaker; the L-pole static contact introduces the arc generated when the N-pole moving contact is separated from the N-pole static contact into the arc extinguishing chamber, and the N-pole static contact introduces the arc generated when the N-pole moving contact is separated from the N-pole static contact to the arc extinguishing rib, so as to extinguish the arc and prevent the arc from burning the contacts.

[0020] (2) A leakage circuit breaker proposed in the embodiment of the present application utilizes the compression elastic force of the moving contact compression spring and the release compression spring, as well as the tensile force of the release tension spring, to rapidly separate the L-pole moving contact from the L-pole static contact; and rapidly separate the N-pole moving contact from the N-pole static contact; to generate a secondary arcing phenomenon, thereby ensuring the safety and reliability of the contacts. When the L-pole moving contact is separated from the L-pole static contact; and the N-pole moving contact is separated from the N-pole static contact; in order to restart the circuit breaker, the handle drives the U-shaped rod to move through the handle torsion spring, and then drives the rotating wheel and the release frame to move in turn, so that the L-pole moving contact is in contact with the L-pole static contact; and the N-pole moving contact is in contact with the N-pole static contact. The release compression spring and the moving contact compression spring in a compressed state generate elastic force, which can fully and reliably contact the L-pole moving contact with the L-pole static contact, and fully and reliably contact the N-pole moving contact with the N-pole static contact.

[0021] (3) In an embodiment of the present application, a leakage circuit breaker is proposed, wherein a partition is used to isolate the circuit board. The circuit board is a current amplification circuit and is a weak current circuit board. The isolation effect of the partition prevents the arc generated when the contacts are separated or the heat generated when the line is overloaded from damaging the circuit board.

[0022] (4) In the embodiment of the present application, a leakage circuit breaker is provided, wherein the N-pole incoming wire post and the N-pole outgoing wire post are respectively provided at the two ends of the housing, so that one end of the circuit breaker is the incoming wire end and the other end is the outgoing wire end, thereby ensuring the safety and reliability of the circuit. The L-pole incoming wire post and the L-pole outgoing wire post are respectively provided at the two ends of the housing, so that one end of the circuit breaker is the incoming wire end and the other end is the outgoing wire end, thereby ensuring the safety and reliability of the circuit.

[0023] (5) A leakage circuit breaker proposed in an embodiment of the present application can adjust the gap between the tripping rod and the bimetallic strip by adjusting the screw. When the bimetallic strip is deformed by the same thermal effect, the gap size is different, and the time for the bimetallic strip to drive the tripping rod to move is different; changing the gap size can change the time for the moving and static contacts to separate, and when the circuit is overloaded, the circuit breaker can be quickly disconnected.

[0024] (6) In an embodiment of the present application, a leakage circuit breaker is proposed, in which a testing mechanism is used to detect whether a leakage protection function is effective. That is, the testing mechanism is used to simulate the generation of leakage current to determine whether the leakage circuit breaker can normally operate and disconnect after sensing the leakage current. The leakage current is simulated by the testing mechanism at regular intervals to detect whether the leakage protection function of the leakage circuit breaker is effective.

[0025] (7) The embodiment of the present application proposes a leakage circuit breaker, in which the L-pole incoming wire column and the L-pole outgoing wire column are respectively arranged at the two ends of the housing, so that one end of the circuit breaker is the incoming wire end and the other end is the outgoing wire end, ensuring the safety and reliability of the line. The arc extinguishing system also includes arc-striking piece 1 and arc-striking piece 2, one end of the arc-striking piece is connected to the arc extinguishing chamber, and the other end of the arc-striking piece is fixedly connected to the double metal support; one end of the arc-striking piece 2 is located at the N-pole moving contact, and the other end of the arc-striking piece 2 is connected to the arc extinguishing rib, so as to achieve the effect of completely extinguishing the arc.

[0026] (8) An embodiment of the present application proposes a leakage circuit breaker. The N-pole of the existing circuit breaker product is equipped with an arc extinguishing chamber, which occupies a large space. The embodiment of the present application sets an arc extinguishing rib at the N-pole to effectively isolate and extinguish the arc, reduce the space occupied, and improve the problem of difficult layout of the circuit breaker product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the L-pole structure of a leakage circuit breaker proposed in an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the N-pole structure of a leakage circuit breaker proposed in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the thermal trip mechanism structure proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0031] Example 1

[0032] Combined with Figure 1-2The present embodiment proposes a leakage circuit breaker, including a housing 42, on which are provided an L-pole inlet and outlet wire post, an N-pole inlet and outlet wire post, a magnetic tripping mechanism, an operating mechanism, a thermal tripping mechanism and an arc extinguishing system; wherein the operating mechanism is connected to one end of a tripping frame 16; the other end of the tripping frame 16 is connected to an L-pole moving contact 21 and an N-pole moving contact 37; a rotating wheel 15 is located below the tripping frame 16, the rotating wheel 15 is connected to one end of a moving contact compression spring 19, and one side of the other end of the moving contact compression spring 19 is connected to one end of the L-pole moving contact 21; the other end of the moving contact compression spring 19 The other side is connected to one end of the N-pole moving contact 37; the other end of the L-pole moving contact 21 is in detachable contact with the L-pole static contact 11; the other end of the N-pole moving contact 37 is in detachable contact with the N-pole static contact 44; the arc extinguishing system includes an arc extinguishing chamber 13 and an arc extinguishing rib 131, the arc extinguishing chamber 13 is used to eliminate the arc generated at the separation of the L-pole static contact 11 and the L-pole moving contact 21; the arc extinguishing rib is used to eliminate the arc generated at the separation of the N-pole static contact 44 and the N-pole moving contact 37; the magnetic tripping mechanism includes a coil 51 connected to the L-pole static contact 11, a moving iron core 7, and a wire The coil skeleton 6 in the coil 51, the leakage coil 52 in the coil skeleton 6, the moving iron core 7, the coil compression spring 8 and the push rod 10 are arranged in sequence in the leakage coil 52 from one end thereof, the other end of the leakage coil 52 is provided with a static iron core 47, the static iron core 47 is provided with a hole through which the push rod 10 can pass; the push rod 10 can pass through the hole to push the trip frame 16, so that the L-pole moving contact 21 is separated from the L-pole static contact 11; the N-pole moving contact 37 is separated from the N-pole static contact 44; the leakage coil 52 and the circuit board 41 output end is connected, the input end of the circuit board 41 is connected to the output end of the magnetic ring 43; the L-pole wire, the N-pole wire and the wire of the test mechanism all pass through the magnetic ring 43; the thermal trip mechanism includes a bimetallic strip 28, one end of the bimetallic strip 28 is connected to the L-pole moving contact 21 through the copper wire 1 23, and the other end of the bimetallic strip 28 is connected to the L-pole wire through the copper wire 2 29, one end of the bimetallic strip 28 is adjacent to the end plate at one end of the tripping rod 24, and under normal conditions, one end of the bimetallic strip 28 maintains a certain gap with the end plate at one end of the tripping rod 24. The other end of the tripping rod 24 is connected to the tripping frame 16. As one of the feasible implementation schemes of this embodiment, the connection method of the other end of the tripping rod 24 and the tripping frame 16 can be: a columnar protrusion is provided at the other end of the tripping rod 24, and the tripping frame 16 is provided with a hole into which the columnar protrusion can be inserted, so that the other end of the tripping rod 24 is connected to the tripping frame 16.

[0033] When the line is overloaded, the bimetallic strip 28 heats up, deforms and bends to a certain extent, and then acts on and contacts the end plate at one end of the tripping rod 24, pulling the tripping rod 24 to move, thereby driving the tripping frame 16 to move. The movement of the tripping frame 16 separates the moving and static contacts, thereby achieving overload protection.

[0034] The operating mechanism is actuated, driving the trip frame 16 to actuate, and the trip frame 16 actuates to actuate the moving contact compression spring 19, thereby separating or contacting the L-pole moving contact 21 with the L-pole static contact 11; the N-pole moving contact 37 with the N-pole static contact 44 is separated or contacted, thereby realizing the closing or opening of the leakage circuit breaker.

[0035] The L-pole static contact 11 introduces the arc generated when the L-pole moving contact 21 is separated from the L-pole static contact 11 into the arc extinguishing chamber 13 through the arc-strike piece 1 32, and the N-pole static contact 44 introduces the arc generated when the N-pole moving contact 37 is separated from the N-pole static contact 44 to the arc extinguishing rib 131 through the arc-strike piece 2 38, so as to extinguish the arc and prevent the arc from burning the contacts;

[0036] When there is leakage current (i.e., residual current) in the circuit, the magnetic ring 43 senses the leakage current and feeds it back to the circuit board 41 for amplification. The amplified leakage current is input into the leakage coil 52, and the leakage coil 52 is energized. The electromagnetic effect of the leakage coil 52 is utilized to attract the moving iron core 7 to move, and the moving iron core 7 pushes the push rod 10 to move. The push rod 10 can pass through the hole on the static iron core 47 to push the trip frame 16, so that the L-pole moving contact 21 is separated from the L-pole static contact 11; the N-pole moving contact 37 is separated from the N-pole static contact 44, thereby realizing leakage protection of the circuit breaker.

[0037] When a short circuit occurs in the circuit, there is a short-circuit current, which is transmitted to the coil 51 and the static iron core 47 through the L-pole static contact 11. The coil 51 and the static iron core 47 are both energized. By utilizing the electromagnetic effect of the coil 51 and the static iron core 47, the coil 51 and the static iron core 47 both attract the moving iron core 7 to move. The moving iron core 7 pushes the push rod 10 to move. The push rod 10 can pass through the hole on the static iron core 47 to push the trip frame 16, so that the L-pole moving contact 21 is separated from the L-pole static contact 11; the N-pole moving contact 37 is separated from the N-pole static contact 44, thereby realizing the short-circuit protection of the circuit breaker.

[0038] When the line is overloaded, the bimetallic strip 28 generates heat and deforms, i.e. bends. As the bimetallic strip 28 continues to be heated, the degree of bending of the bimetallic strip 28 gradually increases, and one end of the bimetallic strip 28 gradually approaches the end plate at one end of the tripping rod 24 until one end of the bimetallic strip 28 contacts the end plate at one end of the tripping rod 24. As the bimetallic strip 28 continues to deform and bend due to heat, the tripping rod 24 will be pulled to move through the end plate, thereby moving the tripping frame 16 to separate the moving and static contacts (i.e., the L-pole moving contact 21 is separated from the L-pole static contact 11; the N-pole moving contact 37 is separated from the N-pole static contact 44), thereby achieving overload protection of the circuit breaker.

[0039] Example 2

[0040] Combined with Figure 1-2 This embodiment proposes a leakage circuit breaker, and the following improvements are made on the basis of the technical solution of Example 1: the operating mechanism includes a handle 1, and a trip frame 16 and a rotating wheel 15 that are detachably engaged with each other, a handle torsion spring 3, a trip tension spring 4, a trip compression spring 18 and a U-shaped rod 2; one end of the handle torsion spring 3 is fixedly connected to the housing 42, and the handle torsion spring 3 body is assembled in the cylindrical hole at the center of the circular part of the handle 1, and the other end of the handle torsion spring 3 is fixed on the surface of the circular part of the handle 1. As one of the implementation methods of this embodiment, a strip groove for placing the other end of the handle torsion spring 3 is provided on the surface of the circular part of the handle 1 to fix the handle torsion spring 3, so as to generate torque when the handle 1 rotates.

[0041] One end of the U-shaped rod 2 is inserted into the circular part of the handle 1, and the other end of the U-shaped rod 2 is engaged with the trip frame 16 and one end of the rotating wheel 15, and the other end of the rotating wheel 15 is connected to one end of the tripping compression spring 18, and the other end of the tripping compression spring 18 is connected to the trip frame 16; as one of the possible implementation methods of this embodiment, the other end of the rotating wheel 15 is provided with a protrusion 1 that matches one end of the tripping compression spring 18; so that the protrusion 1 can be inserted into one end of the tripping compression spring 18, and the trip frame 16 is provided with a protrusion 2 that matches the other end of the tripping compression spring 18; so that the protrusion 2 is released from the other end of the compression spring 18, so as to fix the tripping compression spring 18, and use the compression and rebound force of the tripping compression spring 18 to prevent the U-shaped rod 2 from being released from the engagement with the trip frame 16 and one end of the rotating wheel 15. One end of the tripping tension spring 4 is connected to the housing 42, and the other end of the tripping tension spring 4 is connected to the trip frame 16.

[0042] When the trip frame 16 drives the L-pole moving contact 21 to separate from the L-pole static contact 27 of the L-pole static contact 11; the N-pole moving contact 37 is separated from the N-pole static contact 39 of the N-pole static contact 44, the trip compression spring 18 is in a slightly compressed state, the trip tension spring 4 is in a slightly stretched state; the moving contact compression spring 19 is in a slightly compressed state;

[0043] When the trip frame 16 drives the L-pole moving contact 21 to contact the L-pole static contact 27 of the L-pole static contact 11; the N-pole moving contact 37 contacts the N-pole static contact 39 of the N-pole static contact 44, the trip compression spring 18 is in a deep compression state, the trip tension spring 4 is in a deep tension state; the moving contact compression spring 19 is in a deep compression state.

[0044] (1) The handle 1 utilizes the torsion force of the handle torsion spring 3 to drive the rotating wheel 15 and the trip frame 16 through the U-shaped rod 2, thereby separating the L-pole moving contact 21 and the N-pole moving contact 37.

[0045] (2) When a short circuit occurs in the circuit, a short circuit current is input to the coil 51 and the static iron core 47. The electromagnetic effect is used to attract the moving iron core 7 to move. The moving iron core 7 pushes the push rod 10 to move. The push rod 10 can pass through the hole on the static iron core 47 to push the trip frame 16. The push rod 10 pushes the trip frame 16 to move, thereby separating the L-pole moving contact 21 and the N-pole moving contact 37.

[0046] (3) When there is an overload in the circuit, the bimetallic strip 28 generates heat and deforms. The bent bimetallic strip 28 pulls the tripping rod 24, and the tripping rod 24 pulls the tripping frame 16. The tripping frame 16 moves, thereby separating the L-pole moving contact 21 and the N-pole moving contact 37.

[0047] (4) When there is leakage current in the circuit, the magnetic ring 43 senses the leakage current and then inputs it to the circuit board 41 for amplification. The leakage coil 52 is connected to the output end of the circuit board 41, and the output end of the circuit board 41 is connected to both the leakage coil 52 and the static iron core 47. After the leakage coil 52 and the static iron core 47 are energized, a magnetoelectric effect is generated to attract the moving iron core 7 to move. The moving iron core 7 pushes the push rod 10 to move. The push rod 10 can pass through the hole on the static iron core 47 to push the trip frame 16. The push rod 10 pushes the trip frame 16 to move, thereby separating the L-pole moving contact 21 and the N-pole moving contact 37.

[0048] When any of the above situations (1)-(4) occurs, the L-pole moving contact 21 and the L-pole static contact 11 can be quickly separated by utilizing the moving contact compression spring 19, the release compression spring 18 and the compression elastic force of the release compression spring 18, as well as the tensile force of the release tension spring 4, and the N-pole moving contact 37 and the N-pole static contact 44 can be quickly separated, thereby preventing the occurrence of secondary arcing and ensuring the safety and reliability of the contacts.

[0049] When the L-pole moving contact 21 is separated from the L-pole static contact 11; the N-pole moving contact 37 is separated from the N-pole static contact 44; in order to restart the circuit breaker, the handle 1 uses the torque of the handle torsion spring 3 to drive the rotating wheel 15 and the trip frame 16 through the U-shaped rod 2, so that the L-pole moving contact 21 is in contact with the L-pole static contact 11; the N-pole moving contact 37 is in contact with the N-pole static contact 44, and the trip compression spring 18 and the moving contact compression spring 19 in the compressed state generate elastic force, which can make the L-pole moving contact 21 and the L-pole static contact 11 fully and reliably contact, and the N-pole moving contact 37 and the N-pole static contact 44 fully and reliably contact.

[0050] Example 3

[0051] Combined with Figure 1-2 This embodiment proposes a leakage circuit breaker, which is improved on the basis of the technical solution of embodiment 1 or 2 as follows: it also includes a partition 45 for isolating the circuit board 41.

[0052] The partition 45 is used to isolate the circuit board 41. The circuit board 41 is used to amplify the leakage current and to set a leakage current safety threshold. That is, when the leakage current is lower than the leakage current safety threshold, the leakage current is within a safe range, and the circuit breaker will not perform leakage protection action; when the leakage current is higher than the leakage current safety threshold, the leakage current exceeds the safe range, the circuit board 41 amplifies the leakage current and transmits it to the leakage coil 52. The leakage coil 52 is energized to generate a magnetoelectric effect, attracting the moving iron core 7 to move, and the moving iron core 7 pushes the push rod 10 to move. The push rod 10 can pass through the hole on the static iron core 47 to push the trip frame 16. The push rod 10 pushes the trip frame 16 to move, thereby separating the L-pole moving contact 21 and the N-pole moving contact 37 to perform leakage protection.

[0053] The circuit board 41 is a weak-current circuit board. The isolation function of the partition 45 prevents the circuit board 41 from being damaged by arcs generated when contacts are separated or heat generated when the circuit is overloaded.

[0054] Example 4

[0055] Combined with Figure 1-2 , this embodiment proposes a leakage circuit breaker, and the following improvements are made on the basis of any technical solution of Embodiments 1-3: the N-pole input and output terminals are located on the other side of the shell 42, and the N-pole input and output terminals include an N-pole output terminal 2504, and a terminal block four 46 connected to the N-pole output terminal 2504, and the N-pole output terminal 2504 and the terminal block four 46 are both located at one end edge of the other side of the shell 42; the N-pole input and output terminals also include an N-pole input terminal 2503, and a terminal block three 40 connected to the N-pole input terminal 2503, and the N-pole input terminal 2503 and the terminal block three 40 are both located at the other end edge of the other side of the shell 42.

[0056] Through the above arrangement, the N-pole incoming terminal 2503 and the N-pole outgoing terminal 2504 are respectively arranged at the two ends of the housing 42, so that one end of the circuit breaker is the incoming terminal and the other end is the outgoing terminal, ensuring the safety and reliability of the line.

[0057] Example 5

[0058] Combined with Figure 1-2 This embodiment proposes a leakage circuit breaker, which makes the following improvements based on any technical solution of Embodiments 1-4: the thermal trip mechanism also includes a bimetal support 31 for supporting the bimetallic strip 28, the bimetal support 31 is connected to the bimetallic strip 28, and is used to support the bimetallic strip 28; the other end of the bimetallic strip 28 is adjacent to the adjusting screw 30.

[0059] The gap between one end of the bimetallic strip 28 and the end plate of the tripping rod 24 can be adjusted by adjusting the screw 30. When the bimetallic strip 28 is deformed by the same thermal effect, the time it takes for the bimetallic strip 28 to pull the tripping rod 24 is different due to the size of the gap. By changing the size of the gap, the circuit breaker can be quickly disconnected when the circuit is overloaded.

[0060] Example 6

[0061] Combined with Figure 1-2 , this embodiment proposes a leakage circuit breaker, which is improved on the basis of any technical solution of embodiments 1-5 as follows: it also includes a testing mechanism for detecting whether the leakage protection function is effective, that is, the testing mechanism is used to simulate the generation of leakage current, to determine whether the leakage circuit breaker can normally operate and disconnect after sensing the leakage current, and to simulate the leakage current through the testing mechanism at regular intervals to detect whether the leakage protection function of the leakage circuit breaker is effective. The testing mechanism includes a test button 14, a test button compression spring 20, a button rib piece 1 22 and a button rib piece 2 36 connected to the L pole, and a test button torsion spring 35 in contact with the test button compression spring 20; the test button torsion spring 35 is fixed on the housing 42, the test button torsion spring 35 is connected to the N pole, one end of the test button torsion spring 35 is located at the bottom of the test button 14, and one end of the test button compression spring 20 is located below the bottom of the test button 14; the other end of the test button compression spring 20 is provided with a button rib piece 1 22 and a button rib piece 2 36.

[0062] The button rib piece 1 22 is located at the side of the shell 42 where the L-pole inlet and outlet wire posts are located, and the button rib piece 2 36 is located at the side of the shell 42 where the N-pole inlet and outlet wire posts are located.

[0063] When the test button 14 is pressed, the test button 14 presses down one end of the test button torsion spring 35 and contacts the test button compression spring 20. The test button compression spring 20 contacts and conducts electricity with the button rib piece 1 22 and the button rib piece 2 36, generating leakage current. The wire of the test mechanism passes through the magnetic ring 43. After the magnetic ring 43 senses the leakage current, it is input into the circuit board 41, causing the magnetic tripping mechanism to operate and the moving and static contacts to separate.

[0064] Example 7

[0065] Combined with Figure 1-2 This embodiment proposes a leakage circuit breaker, which is improved on the basis of any technical solution of Embodiments 1-6 as follows: the L-pole inlet and outlet posts are located on one side of the shell 42, and the L-pole inlet and outlet posts include an L-pole inlet post 2501 located on the middle seat 34, and a terminal block 26 connected to the L-pole inlet post 25, and the middle seat 34 and the terminal block 26 are both located at one end edge of one side of the shell 42; the L-pole inlet and outlet posts also include an L-pole outlet post 2502, and a terminal block 29 connected to the L-pole outlet post 2502, and the L-pole outlet post 2502 and the terminal block 29 are both located at the other end edge of one side of the shell 42.

[0066] Through the above arrangement, the L-pole incoming wire post 2501 and the L-pole outgoing wire post 2502 are respectively arranged at the two ends of the housing 42, so that one end of the circuit breaker is the incoming wire end and the other end is the outgoing wire end, thereby ensuring the safety and reliability of the circuit. When the leakage circuit breaker is connected to the circuit, the incoming and outgoing wires of the L-pole wire and the incoming and outgoing wires of the N-pole wire are connected to the leakage circuit breaker in an inserted manner.

[0067] Example 8

[0068] Combined with Figure 1-2 This embodiment proposes a leakage circuit breaker, which is improved on the basis of any technical solution of Embodiments 1-7 as follows: the adjusting screw 30 includes an adjusting bolt 301 and an adjusting screw rod 302, and the end of the bimetallic strip 28 away from the copper wire 23 is adjacent to the adjusting screw rod 302 passing through the adjusting bolt 301, and the adjusting bolt 301 is fixed on the housing 42.

[0069] The gap between one end of the bimetallic strip 28 and the end plate at one end of the tripping rod 24 can be adjusted by adjusting the screw 30, that is, tighten the adjusting screw 302, the adjusting screw 302 contacts the other end of the bimetallic strip 28, and continues to squeeze the other end of the bimetallic strip 28, so that one end of the bimetallic strip 28 moves toward the end plate at one end of the tripping rod 24, and the gap between one end of the bimetallic strip 28 and the end plate at one end of the tripping rod 24 is reduced. When the circuit is overloaded, the bimetallic strip 28 is deformed and bent due to heat, and one end of the bimetallic strip 28 moves toward the end plate at one end of the tripping rod 24. When the bimetallic strip 28 is deformed by the same thermal effect, due to the reduction in the gap, the time for the bimetallic strip 28 to pull the tripping rod 24 is advanced, the time for the moving and static contacts to separate is advanced, and the time for the circuit breaker to operate is advanced when the line is overloaded; changing the size of the gap can change the time for the moving and static contacts to separate, so that the circuit breaker can be quickly disconnected when the line is overloaded. Figure 3 Schematic diagram of the thermal trip mechanism structure. The end plate at one end of the tripping rod 24 is not shown in the figure. The bimetallic strip 28 is connected to the connecting plate 26 through the connecting strip 261.

[0070] Example 9

[0071] Combined with Figure 1-2 This embodiment proposes a leakage circuit breaker, which is improved on the basis of any technical solution of Embodiments 1-8 as follows: the arc extinguishing chamber 13 and the arc extinguishing rib 131 are respectively arranged on both sides of the shell 42, and the arc extinguishing rib 131 is connected to the shell 42; a fixing plate 17 is provided on the shell 42 at the L-pole static contact 11, and the fixing plate 17 is connected to the arc extinguishing chamber 13.

[0072] The fixing plate 17 is made of DuPont 101. When the electric arc ignites the fixing plate 17, the DuPont 101 burns to generate gas, which is introduced into the arc extinguishing chamber 13 to achieve the effect of extinguishing the arc.

[0073] The arc extinguishing system also includes an arc-striking plate 1 32 and an arc-striking plate 2 38, one end of the arc-striking plate 1 32 is connected to the arc extinguishing chamber 13, and the other end of the arc-striking plate 1 32 is fixedly connected to the bimetallic support 31; one end of the arc-striking plate 2 38 is located at the N-pole moving contact 37, and the other end of the arc-striking plate 2 38 is located at the arc extinguishing rib 131, and the arc extinguishing rib 131 divides the arc generated by the N-pole into two, decomposes the arc energy, and reduces the harm caused by the arc; the effect of complete arc extinguishing is achieved through the arc extinguishing chamber 13 and the arc extinguishing rib 131.

[0074] Example 10

[0075] Combined with Figure 1-2This embodiment proposes a leakage circuit breaker, which is improved on the basis of any technical solution of embodiments 1-9 as follows: the mounting clip 12 is used to fix the mounting housing 42, the operating mechanism and the magnetic tripping mechanism pass through both sides of the housing 42, and one side of the housing 42 is also provided with an arc extinguishing chamber 13, an arc striking piece 1 32 and a fixing plate 17 and other components connected or associated with the L-pole conductor; the other side of the housing 42 is also provided with an arc striking piece 2 38, an arc extinguishing rib 131, a magnetic ring 43 and a circuit board 41 and components connected or associated with the N-pole conductor.

[0076] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A leakage circuit breaker, characterized in that: It includes a shell, on which are arranged L-pole inlet and outlet wire posts, N-pole inlet and outlet wire posts, a magnetic tripping mechanism, an operating mechanism, a thermal tripping mechanism and an arc extinguishing system; wherein, The operating mechanism is connected to one end of the trip frame; the other end of the trip frame is connected to the L-pole moving contact and the N-pole moving contact; the rotating wheel is located below the trip frame, the rotating wheel is connected to one end of the moving contact compression spring, one side of the other end of the moving contact compression spring is connected to one end of the L-pole moving contact; the other side of the other end of the moving contact compression spring is connected to one end of the N-pole moving contact; the other end of the L-pole moving contact is in detachable contact with the L-pole static contact; the other end of the N-pole moving contact is in detachable contact with the N-pole static contact; The arc extinguishing system includes an arc extinguishing chamber and arc extinguishing ribs, wherein the arc extinguishing chamber is used to extinguish the arc generated at the separation of the L-pole static contact and the L-pole moving contact; the arc extinguishing ribs are used to extinguish the arc generated at the separation of the N-pole static contact and the N-pole moving contact; The arc extinguishing system further comprises an arc striking piece 1 and an arc striking piece 2, wherein one end of the arc striking piece 1 is connected to the arc extinguishing chamber, and the other end of the arc striking piece 1 is fixedly connected to the bimetallic support; one end of the arc striking piece 2 is located at the N-pole moving contact, and the other end of the arc striking piece 2 is located at the arc extinguishing rib; The magnetic tripping mechanism comprises a coil connected to the L-pole static contact, a moving iron core, a coil frame located in the coil, and a leakage coil located in the coil frame. Starting from one end of the leakage coil, the moving iron core, the coil compression spring and the push rod are sequentially arranged in the leakage coil. The other end of the leakage coil is provided with a static iron core, and the static iron core is provided with a hole through which the push rod can pass; the leakage coil is connected to the output end of the circuit board, and the input end of the circuit board is connected to the output end of the magnetic ring; the L-pole wire, the N-pole wire and the wire of the testing mechanism all pass through the magnetic ring; The thermal trip mechanism includes a bimetallic strip, one end of the bimetallic strip is connected to the L-pole moving contact through a copper wire 1, the other end of the bimetallic strip is connected to the L-pole wire through a copper wire 2, one end of the bimetallic strip is adjacent to an end plate at one end of a tripping pull rod and a gap is provided; the other end of the tripping pull rod is connected to a tripping frame, the thermal trip mechanism also includes a bimetallic support for supporting the bimetallic strip, the bimetallic strip is connected to the bimetallic support; The N-pole inlet and outlet terminals are located on the other side of the shell, and the N-pole inlet and outlet terminals include an N-pole outlet terminal and a terminal block four connected to the N-pole outlet terminal. The N-pole inlet and outlet terminals also include an N-pole inlet terminal and a terminal block three connected to the N-pole inlet terminal.

2. A leakage circuit breaker according to claim 1, characterized in that: The operating mechanism includes a handle, a trip frame and a rotating wheel that are detachably engaged with each other, a handle torsion spring, a trip tension spring, a trip compression spring and a U-shaped rod; one end of the handle torsion spring is fixedly connected to the housing, the handle torsion spring body is assembled in a cylindrical hole at the center of the circular part of the handle, and the other end of the handle torsion spring is fixed on the surface of the circular part of the handle; One end of the U-shaped rod is inserted into the circular part of the handle, and the other end of the U-shaped rod is engaged with the trip frame and one end of the rotating wheel. The other end of the rotating wheel is connected to one end of the trip compression spring, and the other end of the trip compression spring is connected to the trip frame.

3. A leakage circuit breaker according to claim 1, characterized in that: Also included is a partition for isolating the circuit board.

4. A leakage circuit breaker according to claim 1, characterized in that: The N-pole outlet column and the terminal block 4 are both located at the edge of one end of the other side of the shell; The N-pole incoming wire post and the terminal block are both located at the other end edge of the other side of the shell.

5. A leakage circuit breaker according to claim 1, characterized in that: The other end of the bimetallic strip is adjacent to the adjusting screw.

6. A residual current circuit breaker according to claim 1, characterized in that: It also includes a testing mechanism, which includes a test button, a test button compression spring, button rib piece 1 and button rib piece 2 connected to the L pole, and a test button torsion spring in contact with the test button compression spring; the test button torsion spring is fixed on the shell, the test button torsion spring is connected to the N pole, one end of the test button torsion spring is located at the bottom of the test button, and one end of the test button compression spring is located below the bottom of the test button; the other end of the test button compression spring is provided with button rib piece 1 and button rib piece 2.

7. A residual current circuit breaker according to claim 1, characterized in that: The L-pole inlet and outlet terminals are located on one side of the shell, and the L-pole inlet and outlet terminals include an L-pole inlet terminal located on the middle seat, and a terminal block 1 connected to the L-pole inlet terminal, and the middle seat and the terminal block 1 are both located at one end edge of one side of the shell; The L-pole inlet and outlet terminals also include an L-pole outlet terminal and a second terminal block connected to the L-pole outlet terminal. The L-pole outlet terminal and the first terminal block are both located at the other end edge of one side of the shell.

8. A residual current circuit breaker according to claim 5, characterized in that: The adjusting screw comprises an adjusting bolt and an adjusting screw rod, one end of the bimetallic strip away from the copper wire is adjacent to the adjusting screw rod passing through the adjusting bolt, and the adjusting bolt is fixed on the housing.

9. A residual current circuit breaker according to any one of claims 1 to 8, characterized in that: The arc extinguishing chamber and the arc extinguishing ribs are respectively arranged on both sides of the shell, and the arc extinguishing ribs are connected to the shell; a fixing plate is arranged on the shell at the L-pole static contact, and the fixing plate is connected to the arc extinguishing chamber.

10. A residual current circuit breaker according to claim 2, characterized in that: The other end of the rotating wheel is provided with a protrusion 1 matching with one end of the release compression spring, and the release frame is provided with a protrusion 2 matching with the other end of the release compression spring.

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