Electromagnetic system for an earth leakage circuit breaker

Abstract

The utility model relates to an electromagnetic system of leakage circuit breaker, including skeleton, moving iron core, coil, yoke and contact support, the moving iron core is located inside the skeleton, the coil is around the skeleton, and is connected with contact support electricity, and the yoke is installed on the skeleton, and is insulated interval with contact support, the yoke is with skeleton axial positioning, and with skeleton radial can be opposite separation, the skeleton both ends are equipped with first mounting part and second mounting part respectively, the yoke includes first carding board, second carding board and the mainboard of connecting two carding boards, both carding boards all are equipped with the bayonet slot of one side opening, and the opening of two bayonets is same, and two mounting parts are correspondingly inserted into the bayonet slot of two carding boards along the skeleton radial, to realize the bayonet joint cooperation of two carding boards and corresponding mounting part. Set up the yoke with contact support insulation interval, effectively reduced the risk of voltage breakdown, and the bayonet joint mode is convenient for the installation and dismounting of yoke along the skeleton radial.

Description

Technical Field

[0001] This utility model relates to the field of residual current circuit breaker technology, and in particular to an electromagnetic system for a residual current circuit breaker. Background Technology

[0002] In existing 18mm wide 1P+N residual current circuit breakers, there are numerous components and a compact internal structure. When designing the electromagnetic system of the residual current circuit breaker, the coil and contacts are welded together, and the magnetic yoke and contacts are integrated. After energization, the magnetic yoke becomes charged due to contact with the contacts, increasing the risk of withstand voltage breakdown. Welding can easily damage the plastic coil frame. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art. This utility model provides an electromagnetic system for a leakage current circuit breaker, which sets an insulating gap between the magnetic yoke and the contact support, effectively reducing the risk of withstand voltage breakdown; and the snap-fit ​​method facilitates the installation and removal of the magnetic yoke along the radial direction of the frame.

[0004] The technical solution of this utility model is as follows: An electromagnetic system for a residual current circuit breaker includes a frame, a moving iron core, a coil, a magnetic yoke, and a contact support. The moving iron core is disposed inside the frame, the coil is wound on the frame and electrically connected to the contact support, and the magnetic yoke is mounted on the frame and is insulated from the contact support. The frame has a first mounting part and a second mounting part at its two ends, respectively. The magnetic yoke includes a first locking plate, a second locking plate, and a main plate connecting the two locking plates. Both locking plates have a locking groove with an opening on one side, and the openings of the two locking grooves face the same direction. The two mounting parts are respectively inserted into the locking grooves of the two locking plates radially along the frame to achieve a locking fit between the two locking plates and the corresponding mounting parts.

[0005] This utility model has the following beneficial effects: 1. The magnetic yoke and contact support adopt an insulated spacing design, which structurally prevents the magnetic yoke from becoming charged, effectively reducing the risk of withstand voltage breakdown and ensuring high safety; moreover, the two are designed independently, which reduces the processing difficulty of the parts and facilitates forming.

[0006] 2. By snapping the two clamping plates of the magnetic yoke onto the two mounting parts of the frame, the engagement of the clamping slots with the mounting parts is utilized. This snapping method facilitates the installation and removal of the magnetic yoke along the radial direction of the frame, which is beneficial for later maintenance and replacement. At the same time, the open design on one side of the clamping slot makes the snapping and removal process smoother, reduces assembly difficulty, and improves production efficiency.

[0007] A further feature of this invention is that the frame has stop surfaces at both ends, and two locking plates abut against the stop surfaces at both ends to achieve axial positioning of the magnetic yoke and the frame.

[0008] By further configuring the above-mentioned settings, the two clamping plates can stably abut against the corresponding clamping surfaces when the magnetic yoke is installed on the frame, thereby effectively preventing the magnetic yoke from shaking or shifting in the axial direction of the frame.

[0009] A further feature of this invention is that the second mounting part is separate from the frame, and a baffle is provided on the outer periphery of the second mounting part. A portion of the second mounting part is inserted into the frame, and the baffle is located between the stepped surface of the inner ring of the frame and the second mounting plate, so as to achieve axial positioning of the second mounting part and the frame.

[0010] By employing the aforementioned further design, through the cooperation of the baffle, the stepped surface of the inner ring of the frame, and the second mounting plate, not only is the axial stability of the second mounting part on the frame further ensured, but loosening or detachment of the second mounting part is also effectively prevented, enhancing the structural stability and operational reliability of the entire electromagnetic system. Furthermore, this split design and baffle make the installation and disassembly of the second mounting part more flexible and convenient, greatly facilitating future maintenance and upgrades.

[0011] A further feature of this invention is that one end of the moving iron core can extend movably from the second mounting part, while the other end is matched and limited by the first mounting part.

[0012] With the above-mentioned further configuration, one end of the moving iron core can extend from the second mounting part to meet the electromagnetic drive requirements, while the other end cooperates with the first mounting part for limiting, so as to avoid the iron core jamming or electromagnetic force failure due to excessive displacement, and to ensure the timeliness and accuracy of leakage protection action.

[0013] A further feature of this invention is that the first mounting part is provided with a buckle foot, and the inner wall of the buckle foot has a protrusion. The moving iron core abuts against the protrusion to prevent it from axially disengaging from the first mounting part.

[0014] With the aforementioned further design, the buckle and protrusion cleverly cooperate with the moving iron core, effectively preventing the moving iron core from axially detaching from the first mounting part. At the same time, this design simplifies the assembly process between the moving iron core and the mounting part, making assembly easier and faster.

[0015] A further feature of this invention is that the main board is located outside the coil and has a through hole along the axial direction of the coil.

[0016] By adopting the above-mentioned further design, through holes are opened on the motherboard, which can reduce the electric field concentration phenomenon between the coil and the magnetic yoke, reduce the risk of withstand voltage breakdown under high voltage, and is especially suitable for high voltage level leakage circuit breaker scenarios.

[0017] A further feature of this invention is that one end of the coil is provided with a conductive part A, and one end of the contact support is integrally bent to form a conductive part B. The conductive part A and the conductive part B are in planar contact and welded together.

[0018] With the above-mentioned further configuration, the conductive part A of the coil and the conductive part B formed by the integral bending of the contact support are welded together in a planar contact. Compared with the traditional point contact or line contact, the welding area is significantly increased, the welding strength is improved, and the current conduction surface is increased to ensure stable current transmission. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a specific embodiment of the present utility model; Figure 2 This is an internal structural diagram of a specific embodiment of the present utility model; Figure 3 This is a skeleton structure diagram of a specific embodiment of the present utility model; Figure 4 This is a skeleton structure diagram of a specific embodiment of the present utility model; Figure 5 This is a diagram of the internal structure of the skeleton in a specific embodiment of the present utility model; Figure 6 This is a diagram of the magnetic yoke structure according to a specific embodiment of the present invention; Figure 7 This is a coil structure diagram of a specific embodiment of the present utility model; Figure 8 This is a diagram of the contact support structure according to a specific embodiment of the present invention.

[0020] In the diagram: 1. Frame; 2. Moving iron core; 3. Coil; 4. Magnetic yoke; 5. Contact support; 6. Conductive part A31; 7. Conductive part B51; 8. Movable channel 11; 9. First mounting part 12; 10. Buckle 121; 11. Protrusion 1211; 10. Second mounting part 13; 11. First mounting plate 41; 42. Second mounting plate 42; Main board 43; 14. Bayonet slot A; 15. Stop surface 14; 16. Stop platform 131; 17. Step surface 15; 18. Through hole 431. Detailed Implementation

[0021] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figure 1-8As shown, the electromagnetic system of a residual current circuit breaker of this utility model includes a frame 1, a moving iron core 2, a coil 3, a magnetic yoke 4, and a contact support 5. The moving iron core 2 is disposed inside the frame 1. The frame 1 has a movable channel 11 for the moving iron core to move. The moving iron core 2 is slidably disposed in the movable channel 11 so as to move along the movable channel 11 under the action of magnetic force generated when the coil 3 is energized. The coil 3 is wound on the frame 1 and electrically connected to the contact support 5. One end of the coil 3 is provided with a conductive part A31. One end of the contact support 5 is integrally bent to form a conductive part B51. The conductive part is sheet-shaped. The conductive part A31 and the conductive part B51 are in planar contact and welded. The paint at the position of the conductive part A is removed to facilitate welding with the conductive part B. The magnetic yoke 4 is mounted on the frame 1 and is insulated from the contact support 5. The frame 1 has a first mounting part 12 and a second mounting part 13 at both ends. The magnetic yoke 4 includes a first mounting plate 41, a second mounting plate 42 and a main board 43 integrally connected to the two mounting plates. The main board 43 is located outside the coil 3 and has a through hole 431 along the axial direction of the frame. Both mounting plates have a slot A with an opening on one side, and the openings of the two slots A face the same direction. The two mounting parts are respectively inserted into the slots of the two mounting plates along the radial direction of the frame to achieve the snap-fit ​​cooperation between the two mounting plates and the corresponding mounting parts.

[0023] Specifically, the frame 1 has stop surfaces 14 at both ends, and two locking plates abut against the stop surfaces at both ends to achieve axial positioning of the magnetic yoke and the frame. The second mounting part 13 is separately set from the frame 1, and a stop 131 is provided on the outer periphery of the second mounting part 13. Part of the second mounting part 13 is inserted into the movable channel 11 of the frame, and the stop 131 is located between the stepped surface 15 of the inner ring of the frame and the second locking plate 42 to achieve axial positioning of the second mounting part and the frame. The first mounting part 12 is fixed or integrally set with the frame 1. One end of the moving iron core 2 can extend movably from the second mounting part 13, and the other end cooperates with the first mounting part 12 for limitation. The first mounting part 12 is integrally provided with a buckle 121, and the inner wall of the buckle 121 has a protrusion 1211. The moving iron core 2 abuts against the protrusion 1211 to prevent it from axially disengaging from the first mounting part 12.

[0024] During installation, the moving iron core is installed inside the frame, and the coil is wound on the frame. The conductive part A at one end of the coil contacts and welds to the conductive part B at the other end of the contact support. The first and second mounting parts of the frame are aligned with the slots on the two mounting plates of the magnetic yoke. The two mounting parts are then inserted into the corresponding slots radially along the frame. The two mounting plates abut against the stop surfaces at both ends of the frame to achieve axial positioning of the magnetic yoke and the frame. The second mounting part achieves axial positioning through the cooperation of the stop plate with the stepped surface of the inner ring of the frame and the second mounting plate of the magnetic yoke, thus completing the assembly.

[0025] During disassembly, the two mounting parts of the frame are pulled out of the slots of the two clamping plates of the magnetic yoke, allowing for quick separation of the magnetic yoke from the frame. Then, the second mounting part is pulled out of the movable channel, and the moving iron core is removed, completing the disassembly process. Therefore, the disassembly process is less prone to damage, further improving the reusability of the components.

[0026] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An electromagnetic system for a residual current circuit breaker, comprising a frame (1), a moving iron core (2), a coil (3), a magnetic yoke (4), and a contact support (5), wherein the moving iron core (2) is disposed within the frame (1), the coil (3) is wound around the frame (1) and electrically connected to the contact support (5), and the magnetic yoke (4) is mounted on the frame (1), characterized in that: The magnetic yoke (4) and the contact support (5) are insulated from each other; the frame (1) is provided with a first mounting part (12) and a second mounting part (13) at both ends. The magnetic yoke (4) includes a first mounting plate (41), a second mounting plate (42) and a main board (43) connecting the two mounting plates. Both mounting plates are provided with a slot (A) with an opening on one side, and the openings of the two slots (A) face the same direction. The two mounting parts are respectively inserted into the slots of the two mounting plates along the radial direction of the frame to realize the snap-fit ​​cooperation between the two mounting plates and the corresponding mounting parts.

2. The electromagnetic system of an electrical leakage circuit breaker according to claim 1, characterized in that: The frame (1) has stop surfaces (14) at both ends, and the two card plates abut against the stop surfaces at both ends to achieve axial positioning of the magnetic yoke and the frame.

3. The electromagnetic system of an electrical leakage circuit breaker according to claim 1, characterized in that: The second mounting part (13) is separately set from the frame (1), and a baffle (131) is provided on the outer periphery of the second mounting part (13). Part of the second mounting part (13) is inserted into the frame (1), and the baffle (131) is located between the stepped surface (15) of the inner ring of the frame and the second mounting plate (42) to achieve axial positioning of the second mounting part and the frame.

4. The electromagnetic system of an earth leakage circuit breaker according to claim 1 or 2 or 3, characterized in that: One end of the moving iron core (2) can extend from the second mounting part (13), and the other end is matched and limited by the first mounting part (12).

5. The electromagnetic system of an electrical leakage circuit breaker according to claim 4, characterized in that: The first mounting part (12) is provided with a buckle (121), and the inner wall of the buckle (121) has a protrusion (1211). The moving iron core (2) abuts against the protrusion (1211) to restrict it from axially disengaging from the first mounting part (12).

6. The electromagnetic system of an electric leakage circuit breaker according to claim 1 or 2 or 3, characterized in that: The main board (43) is located outside the coil (3) and has a through hole (431) along the axial direction of the skeleton.

7. The electromagnetic system of an electric leakage circuit breaker according to claim 1 or 2 or 3, characterized in that: One end of the coil (3) is provided with a conductive part A (31), and one end of the contact support (5) is integrally bent to form a conductive part B (51). The conductive part A (31) and the conductive part B (51) are in planar contact and welded.

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