Electromagnetic mutual inductor and circuit breaker
By using a cover to compress the shielding sheet and coil in the current transformer, the problem of inefficiency caused by numerous assembly processes in the existing technology is solved, and efficient automated assembly is achieved.
Patent Information
- Application Number
- CN202422789283.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-14
AI Technical Summary
The existing assembly process for current transformers is complex, inefficient, and not conducive to automated assembly.
The first shielding sheet, the first coil, the second shielding sheet, and the second coil are stacked sequentially in the mounting cavity using a cover, and then fixed and pressed together by the cover, simplifying the assembly process.
It simplifies the assembly process, improves efficiency, and facilitates automated assembly.
Smart Images
Figure CN223651247U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrical device, concretely relates to an electromagnetic mutual inductor. BACKGROUND
[0002] Ground Fault Circuit Interrupter (GFCI) can effectively prevent electric shock, electrical equipment leakage and fire hazard accidents, and thus has been widely used. The existing ground fault circuit interrupter is usually equipped with a mutual inductor for leakage detection of the line. The conventional assembly method of the mutual inductor is to fix and assemble the shielding sheets and the coils in the shell one by one. For example, the common method is to first put a shielding sheet into the shell, then to fix the shielding sheet by gluing, and then to put a coil into the shell, and then to fix the coil by gluing. The mutual inductor assembled in this way has a complicated operation process and low efficiency, and is not conducive to the realization of automatic assembly. SUMMARY
[0003] In view of the above problems, the utility model provides an electromagnetic mutual inductor with an optimized structure, and a circuit breaker with the electromagnetic mutual inductor.
[0004] The utility model adopts the following technical solutions:
[0005] The utility model provides an electromagnetic mutual inductor, which comprises a shell, the shell has an annular mounting cavity, one end of the mounting cavity is open, the other end is closed, a first shielding sheet, a first coil, a second shielding sheet and a second coil are sequentially stacked in the mounting cavity, and a cover is fixed and assembled at the open end of the mounting cavity along the axial direction of the mounting cavity and presses the first shielding sheet, the first coil, the second shielding sheet and the second coil.
[0006] Preferably, the cover is bonded or clamped at the open end of the mounting cavity.
[0007] Preferably, the shell comprises a cylindrical outer wall and a sleeve column arranged inside the outer wall, the mounting cavity in the annular shape is formed between the outer wall and the sleeve column, and the first shielding sheet, the first coil, the second shielding sheet and the second coil are sleeved on the sleeve column.
[0008] Preferably, the utility model further comprises a primary pin embedded in the shell, the primary pin has a U-shaped structure, and one end of the primary pin penetrates through the sleeve column along the axial direction of the mounting cavity.
[0009] Preferably, the cross-sectional shape of the primary pin is rectangular.
[0010] Preferably, a pin is fixedly provided on the outer peripheral surface of the outer wall, and a notch is also provided on the outer wall for the terminal of the first coil or the second coil to pass through, and the terminal of the first coil or the second coil is electrically connected to the pin.
[0011] Preferably, one end of the mounting cavity opening is located below the other end of the mounting cavity closure, and the notch extends downward to the lower end face of the outer wall.
[0012] Based on the aforementioned electromagnetic transformer, this utility model also proposes a circuit breaker, including the electromagnetic transformer described above.
[0013] Preferably, the circuit breaker is a ground fault circuit breaker, and the electromagnetic transformer is used to realize leakage current detection.
[0014] The present invention has the following advantages: The present invention only requires the sealing cover to be fixedly assembled, which can press all the shielding sheets and coils together. Unlike the prior art, it does not require the shielding sheets and coils to be assembled one by one layer. This simplifies the assembly operation, improves efficiency, and facilitates automated assembly. Attached Figure Description
[0015] Fig. 1 This is a perspective view (angle 1) of the electromagnetic current transformer in the embodiment;
[0016] Fig. 2 This is a perspective view (angle two) of the electromagnetic current transformer in the embodiment;
[0017] Fig. 3 This is an exploded view of the electromagnetic transformer in the embodiment. Detailed Implementation
[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.
[0020] See Figs. 1-3As shown, in a preferred embodiment of this utility model, an electromagnetic transformer is provided, including a housing 1. The housing 1 has an annular mounting cavity 10. One end of the mounting cavity 10 is open axially, and the other end is closed. For ease of description, the open end of the mounting cavity 10 is defined as being located below the closed end of the mounting cavity 10, that is, the lower end of the mounting cavity 10 is open and the upper end is closed. A first shielding sheet 2, a first coil 3, a second shielding sheet 4, and a second coil 5 are stacked sequentially from top to bottom in the mounting cavity 10. A cover 6 is fixedly assembled along the axial direction of the mounting cavity 10 at one end of the opening of the mounting cavity 10, pressing the first shielding sheet 2, the first coil 3, the second shielding sheet 4, and the second coil 5 together. The cover 6 can be fixed in the mounting cavity 10 by any fixing connection means, such as bonding, or by having buckles and slots on the cover 6 and the mounting cavity 10 respectively, so that the cover 6 is snapped into the mounting cavity 10. With this setup, all shielding sheets and coils can be pressed together by simply fixing the cover 6, eliminating the need to assemble the shielding sheets and coils one by one layer as in existing technologies. This simplifies the assembly process, improves efficiency, and facilitates automated assembly.
[0021] In this embodiment, the housing 1 includes a cylindrical outer wall 11 and a sleeve 12 disposed inside the outer wall 11. An annular mounting cavity 10 is formed between the outer wall 11 and the sleeve 12. The first shielding plate 2, the first coil 3, the second shielding plate 4, and the second coil 5 are all fitted onto the sleeve 12. The primary needle 7 is configured with a U-shaped structure and is embedded and fixed to the housing 1. One end of the primary needle 7 passes through the sleeve 12 along the axial direction of the mounting cavity 10, so that the primary needle 7 can stably pass through the through hole of the coil. The other end of the primary needle 7 extends on the outside of the outer wall 11. In order to embed the primary needle 7, a protrusion 13 is also fixed on the outside of the outer wall 11, and the other end of the primary needle 7 is inserted into the protrusion 13. In this embodiment, there are two primary needles 7, which are arranged left and right and the ends of the two primary needles 7 face downwards in the same direction. The two protrusions 13 are opposite each other in the radial direction of the outer wall 11. The primary pin 7 has a rectangular cross-sectional shape. Compared with the conventional primary pin with a circular cross-section, the rectangular cross-section of the primary pin 7 allows for a larger distance between the two ends of the primary pin 7 while maintaining the same cross-sectional area, thereby increasing the creepage distance.
[0022] Pins 9 are fixedly provided on the outer circumferential surface of the outer wall 11. There are two groups of four pins 9. The outer wall 11 also has notches 8. The two terminals of the first coil 3 pass through the notches 8 and are electrically connected to the two pins 9 in one group. Notches are also provided corresponding to the positions of the two pins 9 of the second coil 5, for the two terminals of the second coil 5 to pass through. The notches extend downward to the lower end face of the outer wall 11, so that the coil leads are not squeezed by the cover 6 and the coil leads are prevented from being broken. Since the first coil 3 is located deeper in the mounting cavity 10, the notch corresponding to the first coil 3 is also deeper than the lower end face of the outer wall 11.
[0023] The pins 9 in each group are arranged at intervals, and the notch is located between two pins 9 in a group to facilitate the wiring of the two terminals of the coil to the two pins.
[0024] The electromagnetic current transformer of this embodiment can be applied to any electrical device that requires the installation of a current transformer, such as a circuit breaker, transformer, ammeter, etc. In one embodiment, the electromagnetic current transformer is applied to a ground fault circuit breaker to realize leakage current detection.
[0025] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.
Claims
1. An electromagnetic current transformer, characterized in that: The device includes a housing with an annular mounting cavity. One end of the mounting cavity is open and the other end is closed. A first shielding sheet, a first coil, a second shielding sheet, and a second coil are stacked sequentially in the mounting cavity. A cover is fixedly assembled along the axial direction of the mounting cavity at one end of the opening of the mounting cavity and presses the first shielding sheet, the first coil, the second shielding sheet, and the second coil together.
2. The electromagnetic transformer according to claim 1, characterized in that: The cap is glued or snapped onto one end of the mounting cavity opening.
3. The electromagnetic transformer according to claim 1, characterized in that: The housing includes a cylindrical outer wall and a sleeve located inside the outer wall, forming an annular mounting cavity between the outer wall and the sleeve. The first shielding plate, the first coil, the second shielding plate, and the second coil are all mounted on the sleeve.
4. The electromagnetic transformer according to claim 3, characterized in that: It also includes a primary pin embedded in the housing, the primary pin having a U-shaped structure, one end of the primary pin passing through the sleeve post along the axial direction of the mounting cavity.
5. The electromagnetic transformer according to claim 4, characterized in that: The primary needle has a rectangular cross-sectional shape.
6. The electromagnetic transformer according to claim 3, characterized in that: Pins are fixedly provided on the outer circumferential surface of the outer wall, and a notch is also provided on the outer wall for the terminals of the first coil or the second coil to pass through, and the terminals of the first coil or the second coil are electrically connected to the pins.
7. The electromagnetic transformer according to claim 6, characterized in that: One end of the mounting cavity opening is defined as being located below the other end of the mounting cavity closure, and the notch extends downward to the lower end face of the outer wall.
8. A circuit breaker, including a current transformer, characterized in that: The current transformer is the electromagnetic current transformer as described in any one of claims 1-7.
9. The circuit breaker according to claim 8, characterized in that: The circuit breaker is a ground fault circuit breaker, and the electromagnetic current transformer is used to realize leakage current detection.