A trip coil structure

Abstract

The utility model belongs to low -voltage electric appliance technical field discloses a kind of tripper coil structures, specifically including coil assembly, moving iron core, static iron core and permanent magnet, coil assembly includes fixed cylinder, coil is arranged in fixed cylinder periphery, permanent magnet is fixed at fixed cylinder opening end, permanent magnet is sleeved in static iron core outside, and static iron core around magnetic attraction is then fixed;Static iron core is at least partly placed in fixed cylinder, moving iron core is also at least partly arranged in fixed cylinder, the part of moving iron core placed in fixed cylinder is limited by fixed cylinder end and static iron core, coil energization can magnetize moving iron core and static iron core, make moving iron core move under magnetic attraction force;The mode of magnetic attraction fixed static iron core, when disassembling, can only need to pull out static iron core, make static iron core and permanent magnet separate, other structure will not be damaged, static iron core is also further removed after dismounting, dismounting step is simple, convenient to repair.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a trip coil structure. Background Technology

[0002] The trip unit is used in conjunction with the circuit breaker to achieve circuit control and protection. The trip unit triggers the circuit breaker to trip by detecting abnormal current, thereby cutting off the power supply to protect equipment and personnel safety.

[0003] In the prior art, the trip coil structure has a housing with one end open. The coil frame, coil, moving iron core and stationary iron core are installed in the housing, and a baffle is fixed at the opening of the housing. The moving iron core and stationary iron core are magnetized by the coil, and the moving iron core moves under the action of magnetic attraction, thereby triggering the circuit breaker. However, the iron core is difficult to disassemble after assembly, and forced disassembly can easily cause structural damage and make repair difficult.

[0004] Therefore, there is an urgent need to provide a trip coil structure to solve the problems of the existing trip coil structure, which makes it difficult to disassemble the iron core after assembly, and the structural damage caused by forced disassembly is difficult to repair. Utility Model Content

[0005] The purpose of this utility model is to provide a trip coil structure to solve the problems of the existing trip coil structure where the iron core is difficult to disassemble after assembly, forced disassembly easily leads to structural damage, and repair is difficult.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a trip coil structure, including a coil assembly, a moving iron core, a stationary iron core, and a permanent magnet. The coil assembly includes a fixed cylinder and a coil disposed on the outer periphery of the fixed cylinder. The permanent magnet is fixed to the open end of the fixed cylinder. The stationary iron core is at least partially inserted into the fixed cylinder. The permanent magnet is sleeved on the outside of the stationary iron core and magnetically fixes the stationary iron core. The moving iron core is at least partially disposed within the fixed cylinder and is movable relative to the fixed cylinder. The portion of the moving iron core placed within the fixed cylinder is limited to the end of the fixed cylinder and the stationary iron core.

[0008] As an optional technical solution for the trip coil structure, the inner circumferential surface of the opening end of the fixed cylinder is provided with reinforcing ribs, and the permanent magnet is tightly fitted with the reinforcing ribs.

[0009] As an optional technical solution for the trip coil structure, the stationary iron core includes a main body and a ring platform radially protruding from the main body. The main body passes through the permanent magnet and is partially placed inside the fixed cylinder. The permanent magnet magnetically attracts and fixes the ring platform.

[0010] As an optional technical solution for the trip coil structure, it also includes a trip actuator, one end of which is fixedly connected to the moving iron core, and the other end of which passes through the stationary iron core and is placed outside the fixed cylinder.

[0011] As an optional technical solution for the trip coil structure, the trip actuator includes a main rod and a mounting cylinder connected to the main rod. The main rod passes through the stationary iron core, and the mounting cylinder is sleeved on the moving iron core, and the mounting cylinder is fixedly connected to the moving iron core.

[0012] As an optional technical solution for the trip coil structure, the inner side of the mounting cylinder is provided with a slot, and the moving iron core is provided with a protrusion, which is engaged in the slot.

[0013] As an optional technical solution for the trip coil structure, the trip actuator also includes an elastic element, which is sleeved on the main rod portion, and its two ends respectively abut against the mounting cylinder portion and the stationary iron core.

[0014] As an optional technical solution for the trip coil structure, the stationary iron core is provided with a receiving hole, the main rod is inserted through the receiving hole, and a conical surface is provided in the receiving hole for abutting against the elastic element. The inner diameter of the conical surface gradually increases towards the mounting cylinder.

[0015] As an optional technical solution for the trip coil structure, it also includes a copper sleeve, which is located inside the fixed cylinder and coaxially arranged with the fixed cylinder, and the moving iron core is movably arranged inside the copper sleeve.

[0016] As an optional technical solution for the trip coil structure, the fixed cylinder has an inner bottom surface at its end, and the distance between the end face of the stationary iron core near the moving iron core and the inner bottom surface is greater than the length of the copper sleeve.

[0017] Beneficial effects:

[0018] This utility model provides a trip coil structure, which includes a coil assembly, a moving iron core, a stationary iron core, and a permanent magnet. The coil assembly includes a fixed cylinder and a coil disposed on the outer periphery of the fixed cylinder. The permanent magnet is fixed to the open end of the fixed cylinder. The stationary iron core is at least partially inserted into the fixed cylinder. The permanent magnet is sleeved on the outside of the stationary iron core and magnetically fixes the stationary iron core. The moving iron core is at least partially disposed in the fixed cylinder and can move relative to the fixed cylinder. The portion of the moving iron core placed in the fixed cylinder is limited to the end of the fixed cylinder and between the stationary iron core. A coil is arranged around the outer periphery of a fixed cylinder, and a permanent magnet is fixed at the open end of the fixed cylinder. The permanent magnet is sleeved on the outside of the stationary iron core, thereby magnetically fixing the stationary iron core around it. The stationary iron core is at least partially placed inside the fixed cylinder, and the moving iron core is also at least partially placed inside the fixed cylinder. The part of the moving iron core placed inside the fixed cylinder is limited by the end of the fixed cylinder and the stationary iron core. When the coil is energized, it can magnetize the moving iron core and the stationary iron core, causing the moving iron core to move under the action of magnetic attraction. By using the method of magnetically fixing the stationary iron core, disassembly can be performed by simply pulling out the stationary iron core to separate it from the permanent magnet without damaging other structures. After the stationary iron core is removed, the moving iron core can also be further removed. The disassembly steps are simple and easy to repair. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the trip coil structure provided in this embodiment of the utility model;

[0020] Figure 2 This is a first-view cross-sectional view of the trip coil structure provided in this embodiment of the utility model;

[0021] Figure 3 This is a cross-sectional view of the trip coil structure provided in this embodiment of the utility model from a second perspective;

[0022] Figure 4 This is a partial cross-sectional view of the trip coil structure provided in this embodiment of the utility model;

[0023] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0024] In the picture:

[0025] 1. Coil assembly; 11. Fixing cylinder; 111. Reinforcing rib; 12. Coil; 2. Moving iron core; 21. Locking protrusion; 3. Stationary iron core; 31. Main body; 310. Receiving hole; 311. First section; 312. Second section; 313. Conical surface; 32. Ring platform; 4. Permanent magnet; 5. Tripping actuator; 51. Main rod; 52. Mounting cylinder; 53. Locking groove; 6. Elastic element; 7. Copper sleeve. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] like Figures 1 to 5 As shown, this embodiment provides a trip coil structure, which includes a coil assembly 1, a moving iron core 2, a stationary iron core 3, and a permanent magnet 4. The coil assembly 1 includes a fixed cylinder 11 and a coil 12 disposed on the outer periphery of the fixed cylinder 11. The permanent magnet 4 is fixed to the open end of the fixed cylinder 11. The stationary iron core 3 is at least partially inserted into the fixed cylinder 11. The permanent magnet 4 is sleeved on the outside of the stationary iron core 3 and magnetically fixes the stationary iron core 3. The moving iron core 2 is at least partially disposed in the fixed cylinder 11 and can move relative to the fixed cylinder 11. The portion of the moving iron core 2 placed in the fixed cylinder 11 is limited to the end of the fixed cylinder 11 and the stationary iron core 3.

[0031] A coil 12 is arranged around the outer periphery of the fixed cylinder 11, and a permanent magnet 4 is fixed at the open end of the fixed cylinder 11. The permanent magnet 4 is sleeved on the outside of the stationary iron core 3, thereby magnetically fixing the stationary iron core 3 around it. The stationary iron core 3 is at least partially placed inside the fixed cylinder 11, and the moving iron core 2 is also at least partially placed inside the fixed cylinder 11. The part of the moving iron core 2 placed inside the fixed cylinder 11 is limited by the end of the fixed cylinder 11 and the stationary iron core 3. When the coil 12 is energized, it can magnetize the moving iron core 2 and the stationary iron core 3, causing the moving iron core 2 to move under the action of magnetic attraction. By using the method of magnetically fixing the stationary iron core 3, disassembly can be performed by simply pulling out the stationary iron core 3 to separate it from the permanent magnet 4 without damaging other structures. After the stationary iron core 3 is removed, the moving iron core 2 can also be further removed. The disassembly steps are simple and easy to repair.

[0032] Specifically, a reinforcing rib 111 is provided on the inner circumferential surface of the opening end of the fixed cylinder 11, and the permanent magnet 4 is tightly fitted with the reinforcing rib 111. The reinforcing rib 111 is provided on the inner side of the fixed cylinder 11 so that the permanent magnet 4 can be firmly embedded in the opening end of the fixed cylinder 11.

[0033] Furthermore, the stationary iron core 3 includes a main body 31 and a ring platform 32 radially protruding from the main body 31. The main body 31 passes through the permanent magnet 4 and is partially placed inside the fixed cylinder 11. The permanent magnet 4 magnetically attracts and fixes the ring platform 32. The radial protrusion of the ring platform 32 on the main body 31 and the magnetic attraction and fixation of the ring platform 32 by the permanent magnet 4 not only make the outer circumference of the ring platform 32 more stable under the action of uniform magnetic attraction, but also use the permanent magnet 4 to restrict the position of the main body 31, preventing the stationary iron core 3 from shifting after the coil 12 is energized.

[0034] In this embodiment, the fixed cylinder 11 is a cylindrical coil frame, and the permanent magnet 4 is annular. The shape of the ring 32 of the stationary iron core 3 matches the shape of the permanent magnet 4, and the side of the ring 32 closest to the moving iron core 2 is magnetically attracted and fixed to the permanent magnet 4. The moving iron core 2 is entirely located inside the fixed cylinder 11. The first end of the fixed cylinder 11 is open, and the second end of the fixed cylinder 11 is completely closed or at least partially closed to stop the moving iron core 2, so that the moving iron core 2 is movably disposed between the second end of the fixed cylinder 11 and the stationary iron core 3. It can be understood that if the permanent magnet 4 is affected by the energization of the coil 12, the magnetic field generated by the permanent magnet 4 can promote the movement of the moving iron core 2, thereby improving the operating efficiency.

[0035] Furthermore, the trip coil structure also includes a trip actuator 5. One end of the trip actuator 5 is fixedly connected to the moving iron core 2, and the other end of the trip actuator 5 passes through the stationary iron core 3 and is placed outside the fixed cylinder 11. Fixing the moving iron core 2 to one end of the trip actuator 5 and placing the other end of the trip actuator 5 through the stationary iron core 3 and outside the fixed cylinder 11 can ensure the synchronicity of the movement of the moving iron core 2 and the trip actuator 5, and can also use the stationary iron core 3 to guide and restrict the movement direction of the moving iron core 2 and the trip actuator 5.

[0036] Specifically, the tripping actuator 5 includes a main rod 51 and a mounting cylinder 52 connected to the main rod 51. The main rod 51 passes through the stationary iron core 3, and the mounting cylinder 52 is sleeved on the moving iron core 2 and is fixedly connected to the moving iron core 2.

[0037] The mounting cylinder 52 is designed to connect with the main rod 51. The mounting cylinder 52 is sleeved on the moving iron core 2 and fixedly connected to the moving iron core 2. Without affecting the movement of the moving iron core 2, the moving iron core 2 and the tripping actuator 5 are in more sufficient contact, which helps to ensure a reliable connection.

[0038] In this embodiment, the mounting cylinder 52 is movably disposed inside the fixed cylinder 11, one end of the main rod 51 is placed inside the fixed cylinder 11 and connected to the mounting cylinder 52, and the other end of the main rod 51 passes through the stationary iron core 3 and is placed outside the fixed cylinder 11.

[0039] Optionally, the inner side of the mounting cylinder 52 is provided with a slot 53, and the moving iron core 2 is provided with a protrusion 21, which is engaged in the slot 53. By designing the slot 53 and the protrusion 21 to engage, the moving iron core 2 is fixed on the mounting cylinder 52, reducing the complex process of traditional threaded or welded connections. It can be processed separately and then quickly assembled. At the same time, it can effectively avoid loosening problems caused by vibration or impact, ensuring that the moving iron core 2 accurately drives the release actuator 5 to move, thereby realizing release.

[0040] In this embodiment, the moving iron core 2 and the tripping actuator 5 are closely fitted together through the slot 53 and the protrusion 21, which is similar to an integrated structure. This ensures that the contact gap between the moving iron core 2 and the tripping actuator 5 is small during the movement, so that the actuator can fully respond to the action. The moving iron core 2 and the tripping actuator 5 provide action feedback at the same time, which can effectively avoid malfunctions and jamming caused by the deformation of the tripping actuator 5.

[0041] The trip coil structure also includes a copper sleeve 7, which is located inside and coaxially arranged with the fixed cylinder 11. The moving iron core 2 is movably disposed inside the copper sleeve 7. The addition of the copper sleeve 7 between the fixed cylinder 11 and the moving iron core 2 can prevent a large gap between the moving iron core 2 and the fixed cylinder 11, thereby ensuring the accurate installation position of the moving iron core 2 and avoiding displacement or misalignment of the moving iron core 2; moreover, as copper is a material with high thermal conductivity, the heat generated by the moving iron core 2 is quickly diffused to the copper sleeve 7, preventing the heat from dissipating through other inefficient paths.

[0042] In this embodiment, the mounting cylinder 52 is sleeved on the moving iron core 2, and the copper sleeve 7 is located between the inner side of the fixed cylinder 11 and the outer peripheral surface of the mounting cylinder 52. The mounting cylinder 52 can move relative to the fixed cylinder 11. The copper sleeve 7 is limited to the end of the fixed cylinder 11 and the stationary iron core 3.

[0043] Optionally, the fixed cylinder 11 has an inner bottom surface at its end, and the distance between the end face of the stationary iron core 3 near the moving iron core 2 and the inner bottom surface is greater than the length of the copper sleeve 7.

[0044] See Figure 3 The inner bottom surface of the fixed cylinder 11 and the end face of the stationary iron core 3 near the moving iron core 2 are both flat. The distance between the inner bottom surface and the end face of the stationary iron core 3 near the moving iron core 2 is L2, and the length of the copper sleeve 7 is L1, where L2 > L1. By designing L2 > L1, excessive pushing force is prevented from the copper sleeve 7 on the stationary iron core 3 during use, ensuring that the stationary iron core 3 can be magnetically attracted and fixed by the permanent magnet 4.

[0045] The tripping actuator 5 also includes an elastic element 6, which is sleeved on the main rod portion 51. Both ends of the elastic element 6 abut against the mounting cylinder portion 52 and the stationary iron core 3, respectively. In this embodiment, the coil 12 is enameled wire; the elastic element 6 is a spring.

[0046] An elastic element 6 is installed between the mounting cylinder 52 and the stationary iron core 3, and is sleeved on the main rod 51. When the coil 12 is energized, the moving iron core 2 and the stationary iron core 3 are magnetized. The moving iron core 2 and the tripping actuator 5 move synchronously toward the stationary iron core 3, and the elastic element 6 is compressed. When the coil 12 is not energized, the moving iron core 2 and the tripping actuator 5 move in the opposite direction and reset under the action of the elastic element 6. The reset force is provided by the elastic element 6, resulting in a fast response speed. It relies solely on physical characteristics, is stable and reliable, and requires low maintenance frequency.

[0047] In other embodiments, the trip coil structure can be used vertically, and the reset can be achieved by the gravity of the moving iron core 2 itself, or by energizing the coil 12 in reverse, or by using external machinery to control the reset.

[0048] Optionally, the stationary iron core 3 is provided with a receiving hole 310, and the main rod portion 51 passes through the receiving hole 310. The receiving hole 310 is provided with a conical surface 313 for abutting against the elastic element 6. The inner diameter of the conical surface 313 gradually increases towards the mounting cylinder portion 52. The design of the receiving hole 310 with a conical surface 313, and the inner diameter of the conical surface 313 gradually increasing towards the mounting cylinder portion 52, facilitates the installation of the elastic element 6. At the same time, the use of the conical surface 313 to abut against the elastic element 6 can effectively disperse the concentrated stress at the end of the elastic element 6, which helps to more accurately position the elastic element 6 axially.

[0049] In this embodiment, the receiving hole 310 includes a first segment 311, a second segment 312, and a third segment. The first segment 311 is connected to the second segment 312 through the third segment. The axial directions of the first segment 311, the second segment 312, and the third segment coincide. The inner diameter of the first segment 311 is larger than the inner diameter of the second segment 312. The inner diameter of the first segment 311 is larger than the maximum outer diameter of the elastic element 6. The inner diameter of the second segment 312 matches the outer diameter of the main rod portion 51. The inner wall of the third segment is the conical surface 313.

[0050] The following is a detailed description of the installation and usage process of the trip unit coil structure:

[0051] The coil 12 is installed outside the fixed cylinder 11. The mounting cylinder 52 of the tripping actuator 5 is sleeved and fixed on the moving iron core 2. The moving iron core 2 and the mounting cylinder 52 of the main rod 51 of the tripping actuator 5 are placed into the fixed cylinder 11. Then, the copper sleeve 7 is placed between the fixed cylinder 11 and the mounting cylinder 52 of the tripping actuator 5. The elastic member 6 is sleeved on the main rod 51. The permanent magnet 4 is reliably fixed to the open end of the fixed cylinder 11 by the reinforcing rib 111. Finally, the stationary iron core 3 is installed. The main body 31 of the stationary iron core 3 passes through the permanent magnet 4 and is partially placed inside the fixed cylinder 11. The ring platform 32 of the stationary iron core 3 is magnetically fixed to the permanent magnet 4.

[0052] Because the permanent magnet 4 has a magnetic attraction effect on the stationary iron core 3, it effectively positions the stationary iron core 3 and prevents the internal parts of the fixed cylinder 11 from falling off. Even if the fixed cylinder 11 is placed vertically, the internal moving iron core 2, tripping actuator 5, and copper sleeve 7 will not fall off, thus improving the effective stability during assembly. Furthermore, because the permanent magnet 4 has an attraction effect on ferrous materials, it can reduce the number of turns of the coil 12, preventing the coil 12 (i.e., enameled wire) from bulging excessively and avoiding overheating due to wire accumulation.

[0053] Since the stationary iron core 3 is fixed to the fixed cylinder 11 by the reinforcing rib 111, it does not need to be disassembled when the product is reworked. Only the stationary iron core 3 needs to be pulled out. The process of pulling out the stationary iron core 3 will not damage other parts. Moreover, the disassembly process is simple and only requires separating the stationary iron core 3 from the permanent magnet 4, which reduces the waste of resources. After repair, it can be reused.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A trip unit coil structure, characterized in that, The device includes a coil assembly (1), a moving iron core (2), a stationary iron core (3), and a permanent magnet (4). The coil assembly (1) includes a fixed cylinder (11) and a coil (12) disposed on the outer periphery of the fixed cylinder (11). The permanent magnet (4) is fixed to the open end of the fixed cylinder (11). The stationary iron core (3) is at least partially inserted into the fixed cylinder (11). The permanent magnet (4) is sleeved on the outside of the stationary iron core (3) and magnetically fixes the stationary iron core (3). The moving iron core (2) is at least partially disposed inside the fixed cylinder (11) and can move relative to the fixed cylinder (11). The portion of the moving iron core (2) placed inside the fixed cylinder (11) is limited to the end of the fixed cylinder (11) and the stationary iron core (3).

2. The trip coil structure according to claim 1, characterized in that, The inner circumferential surface of the opening end of the fixed cylinder (11) is provided with reinforcing ribs (111), and the permanent magnet (4) is closely fitted with the reinforcing ribs (111).

3. The trip coil structure according to claim 2, characterized in that, The static iron core (3) includes a main body (31) and a ring platform (32) that protrudes radially from the main body (31). The main body (31) passes through the permanent magnet (4) and is partially placed inside the fixed cylinder (11). The permanent magnet (4) magnetically attracts and fixes the ring platform (32).

4. The trip coil structure according to claim 1, characterized in that, It also includes a tripping actuator (5), one end of which is fixedly connected to the moving iron core (2), and the other end of which passes through the stationary iron core (3) and is placed outside the fixed cylinder (11).

5. The trip coil structure according to claim 4, characterized in that, The tripping actuator (5) includes a main rod (51) and a mounting cylinder (52) connected to the main rod (51). The main rod (51) passes through the stationary iron core (3), and the mounting cylinder (52) is sleeved on the moving iron core (2). The mounting cylinder (52) is fixedly connected to the moving iron core (2).

6. The trip coil structure according to claim 5, characterized in that, The mounting cylinder (52) has a slot (53) on its inner side, and the moving iron core (2) has a protrusion (21) which is engaged in the slot (53).

7. The trip coil structure according to claim 5, characterized in that, The tripping actuator (5) also includes an elastic element (6), which is sleeved on the main rod (51). The two ends of the elastic element (6) abut against the mounting cylinder (52) and the stationary iron core (3), respectively.

8. The trip coil structure according to claim 7, characterized in that, The stationary iron core (3) is provided with a receiving hole (310), and the main rod (51) passes through the receiving hole (310). The receiving hole (310) is provided with a conical surface (313) for abutting against the elastic member (6). The inner diameter of the conical surface (313) gradually increases in the direction close to the mounting cylinder (52).

9. The trip coil structure according to any one of claims 1-8, characterized in that, It also includes a copper sleeve (7), which is located inside the fixed cylinder (11) and coaxially arranged with the fixed cylinder (11), and the moving iron core (2) is movably arranged inside the copper sleeve (7).

10. The trip coil structure according to claim 9, characterized in that, The fixed cylinder (11) has an inner bottom surface at its end. The distance between the end face of the stationary iron core (3) near the moving iron core (2) and the inner bottom surface is greater than the length of the copper sleeve (7).

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