Bobbin structure, magnetic element and method for leading out coil

Abstract

To provide a bobbin structure, a magnetic element and a method for leading out a coil.SOLUTION: A bobbin structure includes a body, a guide member and a lead-out sleeve. The body is wound with a coil. The guide member is provided at an end portion of the body in a vertical direction, and a guide channel is provided in the guide member. The lead-out sleeve is disposed on the guide member and configured to communicate with the guide channel. The lead-out sleeve includes an accommodating structure with an opening, the accommodating structure protruding from the guide member. The guide channel is used to guide a coil end into the accommodating structure. The accommodating structure is malleable and disposed to be able to close the opening after being pressed to form a closed annular space, the accommodating structure being used to wrap the coil end. The bobbin structure of the present invention is capable of reducing an occupied space, makes a lead-out operation easy, and achieves automatic routing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic elements, and particularly to a bobbin structure, a magnetic element, and a coil lead-out method.

Background Art

[0002] When a magnetic element attempts to operate in a system, the electrical characteristics cannot be exhibited unless the lead-out end of the coil winding is connected to the system side. For a high-power magnetic element that needs to be soldered to a PCB (Printed Circuit Board), the conventional general connection method is through-hole soldering, that is, after inserting the pins of the magnetic element into the through-holes on the PCB, the pins are fixed to the through-holes of the PCB by soldering.

[0003] In the case of a high-power magnetic element, a plurality of twisted wires are usually used for its coil in consideration of the skin effect. When the ends of a plurality of twisted wires are connected to the pins, it occupies a large space, and the operation is complicated, and automatic wiring cannot be realized.

[0004] The above information disclosed in this background art section is only for deepening the understanding of the background of the present invention and may include information that does not constitute related art already known to those skilled in the art.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Embodiments of the present invention provide a bobbin structure, a magnetic element, and a coil lead-out method that can reduce the occupied space, have a simple lead-out operation, and can realize automatic wiring.

Means for Solving the Problems

[0006] Embodiments of the present invention provide a bobbin structure, which includes a main body portion, a guiding member, and a drawing sleeve. Here, the main body portion is used for winding a coil. The guiding member is provided at an end portion of the main body portion in the vertical direction, and the guiding member is provided with a guiding passage. The drawing sleeve is provided on the guiding member and communicates with the guiding passage. The drawing sleeve includes a receiving structure having an opening, and the receiving structure protrudes from the guiding member. Here, the guiding passage is used for guiding an end portion of the coil into the receiving structure. The receiving structure has ductility and is arranged such that after being pressed, it can close the opening to form an annular closed space so as to wrap the end portion of the coil.

[0007] In some embodiments of the present invention, the drawing sleeve further includes a connection structure connected to the guiding member. The receiving structure is connected to the connection structure and includes a first side wall, a second side wall, and an arc bottom wall. Here, the arc bottom wall is connected to the connection structure, the first side wall and the second side wall are located on opposite sides of the arc bottom wall, and the receiving structure presents a U shape. The first side wall and the second side wall are arranged such that after being pressed, they can form the arc bottom wall and the annular closed space.

[0008] In some embodiments of the present invention, the contour of the first cross-section of the arc bottom wall is semi-circular, and the contour of the second cross-section formed by pressing the first side wall and the second side wall is semi-circular. Thus, the contour of the cross-section of the receiving structure after being pressed is circular.

[0009] In some embodiments of the present invention, the guide member includes a guide bottom wall, a first guide side wall and a second guide side wall that are located on both opposite sides of the guide bottom wall and connected to the guide bottom wall to form the guide passage. Here, the first guide side wall has a mounting groove opened in the vertical direction, and the mounting bottom surface of the mounting groove is lower than the surface of the guide bottom wall for placing the end of the coil, and exposes a first side surface of the guide bottom wall facing the mounting groove. An insertion opening extending in a direction approaching the second guide side wall is opened in the first side surface. Opposite side walls of the mounting groove are further provided with a first positioning notch and a second positioning notch facing each other.

[0010] In some embodiments of the present invention, the connection structure includes an insertion part inserted into the insertion opening on the first side surface, a positioning part that is fitted and attached to the mounting groove, one end of which is connected to the insertion part, and the other end of which is connected to the arc bottom wall of the accommodating structure, and first positioning fins and second positioning fins that are respectively located on both opposite sides of the positioning part and bent in a direction away from the positioning part and engaged with the first positioning notch and the second positioning notch.

[0011] In some embodiments of the present invention, the first positioning fin is installed at a distance from the first side wall, and the second positioning fin is installed at a distance from the second side wall.

[0012] In some embodiments of the present invention, the extraction sleeve further includes a position restricting structure, which is provided on the accommodating structure and extends in a direction approaching the connection structure. The position restricting structure has a position restricting surface, and the position restricting surface is flush with the side surfaces of the first positioning fin and the second positioning fin and contacts the first guide side wall.

[0013] In some embodiments of the present invention, the extraction sleeve is integrally formed, and the insertion part and the positioning part of the connection structure are both arc-shaped structures and are integrally formed with the arc bottom wall of the accommodation structure, and the radian of the insertion part is consistent with the radian of the positioning part.

[0014] In some embodiments of the present invention, the number of the guide members is one, the guide member includes at least two of the guide passages, and at least one of the extraction sleeves is provided in each of the guide passages.

[0015] In some embodiments of the present invention, the number of the guide members is plural, and the guide members are provided at two end portions of the main body portion facing in the vertical direction. Each of the guide members has at least one of the guide passages, and at least one of the extraction sleeves is provided in each of the guide passages.

[0016] In some embodiments of the present invention, the extraction sleeve is vertically connected to the side wall of the guide member.

[0017] The embodiments of the present invention further provide a magnetic element, which includes a bobbin structure and a coil. The bobbin structure includes a main body portion, a guide member, and an extraction sleeve. Here, the guide member is provided at an end portion of the main body portion in the vertical direction, and a guide passage is provided. The extraction sleeve is provided on the guide member and communicates with the guide passage, and includes an accommodation structure having an opening, and the accommodation structure protrudes from the guide member. The coil is wound around the main body portion, an end portion of the coil is located in the extraction sleeve through the guide passage, the extraction sleeve has an annular closed space, and the end portion of the coil is fixed and connected in the annular closed space.

[0018] An embodiment of the present invention further provides a coil lead-out method, including the steps of providing the bobbin structure described in any of the above embodiments, winding a coil around the main body of the bobbin structure, and guiding an end of the coil from a guide passage of a guide member of the bobbin structure to a lead-out sleeve, pressing the lead-out sleeve to form an annular closed space in the lead-out sleeve to wrap the end of the coil, and soldering the end of the coil and the lead-out sleeve to form a lead-out end.

[0019] As can be seen from the above technical solutions, the bobbin structure of the embodiment of the present invention has at least one of the following advantages and positive effects.

[0020] In an embodiment of the present invention, the guide member is provided with a guide passage, the lead-out sleeve is provided on the guide member and communicates with the guide passage, and the end of the coil can be guided into the lead-out sleeve by the guide passage, thereby realizing automatic wiring. Further, the lead-out sleeve includes a receiving structure having an opening, and the receiving structure protrudes from the guide member. After the end of the coil is disposed in the receiving structure, the receiving structure can be pressed and closed to form an annular closed space, thereby wrapping the end of the coil. The end of the coil having a plurality of twisted wires is received in the annular space, and the receiving structure and the pin are formed and can be directly connected to the through hole, reducing the occupied space, simplifying the operation, and making the connection with the through hole more accurate.

[0021] The above and other features and advantages of the present invention will become more apparent by describing exemplary embodiments of the present invention in detail with reference to the accompanying drawings.

Brief Description of the Drawings

[0022]

Figure 1

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Modes for Carrying Out the Invention

[0023] Exemplary embodiments will be described in more detail below with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings denote the same or similar configurations, detailed descriptions thereof will be omitted.

[0024] In the following description, different exemplary embodiments of the present invention will be described with reference to the accompanying drawings. The drawings form a part of this specification and show, by way of example, different exemplary structures capable of implementing various aspects of the present invention. Note that the present invention can also use other specific aspects of components, structures, exemplary devices, systems, and steps, and various structural and functional changes are possible without departing from the spirit of the present invention. Further, in order to describe different exemplary features and elements of the present invention in this specification, terms such as "above", "between", and "inside" are used, but these terms are used for convenience according to the exemplary directions in the drawings, for example, in this specification. None of this specification should be construed as requiring a specific three-dimensional orientation for structures falling within the scope of the present invention. Further, "first", "second", etc. in the claims are used only as notations and do not limit the order of their objects.

[0025] The flowcharts shown in the drawings are exemplary and do not necessarily include all contents and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps may be further divided, some operations / steps may be combined, or partially combined, and thus the actual execution order may be changed according to the actual situation.

[0026] Also, in the description of the present invention, "a plurality" means at least two, for example, two, three, etc., unless otherwise explicitly stated.

[0027] Magnetic elements with high power generally use a plurality of twisted wires as coils. The ends of the coils are connected to pins, and then the pins are inserted into through-holes on the PCB and soldered to achieve the electrical connection between the magnetic element and the circuit on the PCB.

[0028] In related technologies, various methods can be used to realize the connection between the end of the coil and the through-hole. For example, one method is to wind the end of the coil around the pin and then insert the pin into the through-hole. However, in this method, the end of the coil becomes messy, the wiring space becomes narrow, automatic wiring cannot be realized, the operation is difficult, and a large space needs to be occupied. Another method is to wrap the end of the coil with the pin, but this requires changing the pin, the occupied space of the pin after the change increases, and the wire is wasted. Still another method is to directly connect a plurality of twisted wires at the end of the coil to the through-hole, thereby omitting the pin. However, the plurality of twisted wires are likely to scatter, are difficult to fix to the through-hole, need to be manually twisted, automatic wiring cannot be realized, and the remaining thread ends left in advance are too long and result in waste.

[0029] Based on this, the embodiments of the present invention provide a bobbin structure 100 that can reduce the occupied space, simplify the operation, realize automatic wiring, and prevent waste of wire.

[0030] As shown in FIGS. 1 and 2, the bobbin structure 100 of the embodiment of the present invention includes a main body portion 1, a guide member 2, and a lead-out sleeve 3. As shown in FIGS. 3 and 4, the main body portion 1 is used to wind the coil 200. The main body portion 1 can include a winding portion 11, a first flange portion 12 and a second flange portion 13 located at both ends of the winding portion 11 in the vertical direction Z. The first flange portion 12 and the second flange portion 13 extend along a plane perpendicular to the vertical direction Z from opposite ends of the winding portion 11, thereby forming a winding space between the two flange portions of the main body portion 1. The coil 200 is wound around the winding portion 11 and is located in this winding space.

[0031] In addition, the vertical direction Z in the embodiments of the present invention is defined as the height direction of the main body 1. Further, when the main body 1 has a shape such as a cylinder or a rectangular parallelepiped, the vertical direction Z refers to the axial direction of the main body 1, and the plane in which the first flange portion 12 and the second flange portion 13 extend is parallel to the radial direction of the main body 1. Technical terms such as "vertical direction" and "radial direction" are merely for explaining the structure of the embodiments of the present invention and do not have a limiting meaning.

[0032] In some embodiments of the present invention, the first flange portion 12, the winding portion 11, and the second flange portion 13 are distributed in the vertical direction Z.

[0033] As shown in FIGS. 1 and 2, the guide member 2 is provided at an end portion of the main body 1 in the vertical direction Z. In some embodiments of the present invention, the guide member 2 is attached to the first flange portion 12 and / or the second flange portion 13, and a guide passage 20 is provided in the guide member 2. The extraction sleeve 3 is provided in the guide member 2 and communicates with the guide passage 20. The extraction sleeve 3 includes a housing structure 31 having an opening, and the housing structure 31 protrudes from the guide member 2. As shown in FIG. 3, the guide passage 20 is used to guide the end portion 210 of the coil 200 into the housing structure 31. As shown in FIG. 4, the housing structure 31 has ductility and is arranged so as to be able to close the opening after being pressed to form an annular closed space S, and is used to wrap the end portion 210 of the coil 200.

[0034] In the embodiment of the present invention, the end 210 of the coil 200 can be guided into the drawing sleeve 3 through the guide passage 20, so that automatic wiring can be realized, i.e., wiring is performed using a robot arm, and there is no need to wire manually, and the multiple strands of the end 210 are not scattered (in order to emphasize the shape of the multiple strands of the end 210 that is not scattered, in Figs. 3, 4, 11 and 12, the shape of the multiple strands of the end 210 of the coil 200 is not shown, and the overall state after the end 210 is soldered is shown roughly). After the end 210 of the coil 200 is placed in the receiving structure 31, the receiving structure 31 can be pressed and closed to form an annular closed space S. This allows the end 210 of the coil 200 to be wrapped and the end 210 of the coil 200 with multiple strands to be received in the annular closed space S, forming a pin with the receiving structure 31, and directly connected to the through hole on the PCB. This reduces the occupied space, simplifies the operation, and makes the connection with the through hole more accurate.

[0035] In some embodiments of the present invention, as shown in Fig. 5, the drawing sleeve 3 includes a connecting structure 32, which is connected to the guide member 2. The receiving structure 31 is connected to the connecting structure 32, and the receiving structure 31 includes a first side wall 311, a second side wall 312 and a circular arc bottom wall 313. The receiving structure 31 has a U-shape, such that the circular arc bottom wall 313 is connected to the connecting structure 32, and the first side wall 311 and the second side wall 312 are located on opposite sides of the circular arc bottom wall 313. As shown in Fig. 6, the first side wall 311 and the second side wall 312 are arranged to form an annular closed space S with the circular arc bottom wall 313 after being pressed.

[0036] 1 and 5, the pull sleeve 3 extends along an axial direction X, and the connecting structure 32 is connected to the guide member 2 in the axial direction X. Here, the axial direction X is the extension direction of the axis of the pull sleeve 3.

[0037] In some embodiments of the present invention, as shown in FIG. 5, the contour of the first cross-section 3131 of the arc bottom wall 313 is semi-circular, and as shown in FIG. 6, the contour of the second cross-section 3132 after the first side wall 311 and the second side wall 312 are pressed is semi-circular. Thereby, the contour of the cross-section of the accommodation structure 31 after being pressed becomes circular.

[0038] In an embodiment of the present invention, the first cross-section 3131 and the second cross-section 3132 are cross-sections perpendicular to the axial direction X respectively. That is, the arc bottom wall 313 is semi-circular, and the first side wall 311 and the second side wall 312 form a semi-circular shape that matches the arc bottom wall 313 after being pressed. In this way, the pressing process is made easier, and the cross-section of the accommodation structure 31 after being pressed is made circular, improving the compatibility with the through hole and making the connection between the two more stable. Also, based on the diameter of the through hole, the radian of the arc bottom wall 313 of the accommodation structure 31 and the dimensions of the first side wall 311 and the second side wall 312 can be designed to improve the degree of fit.

[0039] Continuing to refer to FIG. 5, in an embodiment of the present invention, the connection structure 32 includes an insertion part 321, a positioning part 322, a first positioning fin 323, and a second positioning fin 324. Here, the positioning part 322 and the insertion part 321 are connected in the axial direction X and are used to connect to the guide member 2. The positioning part 322 and the insertion part 321 may have an arc plate structure. One end of the positioning part 322 in the axial direction X is connected to the insertion part 321, and the other end is connected to the arc bottom wall 313 of the accommodation structure 31. In some embodiments, the axes of the insertion part 321, the positioning part 322, and the arc bottom wall 313 are the same. The first positioning fin 323 and the second positioning fin 324 are respectively located on opposite sides of the positioning part 322 and are bent in a direction away from the positioning part 322.

[0040] As shown in FIGS. 1 and 2, the guide member 2 may be provided on the flange portion of the main body portion 1. The guide member 2 includes a guide bottom wall 23, a first guide side wall 21, and a second guide side wall 22. The first guide side wall 21 and the second guide side wall 22 are located on opposite sides of the guide bottom wall 23 and are connected to the guide bottom wall 23 to form a guide passage 20.

[0041] As shown in FIG. 1, the guide passage 20 communicates with the winding space in the main body portion 1 such that after the coil 200 is wound around the winding portion 11, the end portion 210 thereof can enter the guide passage 20.

[0042] As shown in FIGS. 8 and 9, on the first guide side wall 21, a mounting groove 211 is opened in the vertical direction Z, and the mounting bottom surface 2111 of the mounting groove 211 is lower than the surface of the guide bottom wall 23 on which the end portion 210 of the coil 200 is placed. Thereby, the first side surface 231 of the guide bottom wall 23 facing the mounting groove 211 is exposed. An insertion port 232 extending in the direction toward the second guide side wall 22 is opened in the first side surface 231. The insertion portion 321 of the connection structure 32 is inserted into the insertion port 232 along the axial direction X to connect the connection structure 32 to the guide member 2. The shape and dimensions of the insertion port 232 are adapted to the shape and dimensions of the insertion portion 321, and the fitting between the insertion portion 321 and the insertion port 232 is a tight fit or a clearance fit. Further, an appropriate fixing adhesive is dropped into the insertion port 232 to improve the connection strength between the two, prevent the extraction sleeve 3 from sliding in the axial direction X, and improve stability.

[0043] As shown in FIG. 9, the shape and dimensions of the mounting groove 211 are all adapted to the positioning portion 322 of the connection structure 32. For example, the positioning portion 322 has an arc-shaped plate structure, and the surface of the mounting groove 211 is also an arc, and the radian thereof coincides with the radian of the positioning portion 322. Thereby, the positioning portion 322 can be mounted in the mounting groove 211 along the axial direction X, ensuring the perpendicularity of the extraction sleeve 3 with respect to the guide member 2 and having a positioning function.

[0044] Continuing to refer to FIG. 9, on two opposite side walls of the mounting groove 211, opposing first positioning notches 212 and second positioning notches 213 are respectively formed. The first positioning notches 212 and the second positioning notches 213 are symmetrically installed. As shown in FIG. 1, the first positioning fins 323 and the second positioning fins 324 are respectively locked to the first positioning notches 212 and the second positioning notches 213. For example, the first positioning fins 323 and the second positioning fins 324 are respectively snap-fitted in the vertical direction Z with respect to the first positioning notches 212 and the second positioning notches 213. Also, for example, protrusions are respectively provided on the first positioning fins 323 and the second positioning fins 324, locking grooves are provided on the inner side walls of the first positioning notches 212 and the second positioning notches 213, and when the first positioning fins 323 and the second positioning fins 324 are respectively arranged in the first positioning notches 212 and the second positioning notches 213, the protrusions are locked to the corresponding locking grooves, and locking between the positioning fins and the positioning notches can be realized. In this way, sliding of the two fins in the axial direction X can be prevented, and the stability of the connection between the pull-out sleeve 3 and the guide member 2 can be further improved. Also, the first positioning fins 323, the second positioning fins 324 and the insertion portion 321 can provide a three-point positioning function, ensuring the positioning accuracy, perpendicularity and stability of the pull-out sleeve 3.

[0045] As shown in FIGS. 5 and 6, the first positioning fin 323 is installed at a distance from the first side wall 311 of the accommodating structure 31, and the second positioning fin 324 is installed at a distance from the second side wall 312 of the accommodating structure 31. That is, the end faces of the two positioning fins close to the accommodating structure 31 each have a gap with the end faces of the two side walls of the accommodating structure 31, forming the structure of an isolation groove. By the above installation, after the first positioning fin 323 and the second positioning fin 324 are attached to the first positioning notch 212 and the second positioning notch 213, the end faces of the first side wall 311 and the second side wall 312 do not contact the first guide side wall 21 of the guide member 2. As a result, when subsequently pressing the first side wall 311 and the second side wall 312, it is possible to prevent the first guide side wall 21 from generating resistance and reduce the pressing difficulty. Further, when pressing the first side wall 311 and the second side wall 312, the deformation of the first side wall 311 and the second side wall 312 does not affect the first positioning fin 323 and the second positioning fin 324. That is, the two positioning fins do not deform and do not loosen under the influence of the pressing force, thus ensuring the accuracy of the attachment position and the stability of the attachment of the extraction sleeve 3.

[0046] As shown in FIG. 7, in some embodiments, the extraction sleeve 3 further includes a position regulating structure 33 extending in a direction close to the connection structure 32 provided in the accommodating structure 31. The position regulating structure 33 has a position regulating surface 331. As shown in FIGS. 10 and 11, the position regulating surface 331 is flush with the side surfaces of the first positioning fin 323 and the second positioning fin 324 and contacts the first guide side wall 21.

[0047] As shown in FIG. 7, in some embodiments, the position restricting structure 33 may be a wedge bump that protrudes from the outer surface of the arc-shaped bottom wall 313 of the accommodating structure 31 (the surface not used to cover the end portion 210 of the coil 200) and extends in a direction approaching the insertion portion 321 along the axial direction X. The position restricting surface 331 is located at the end of the wedge bump approaching the insertion portion 321 and is a vertical surface. After the extraction sleeve 3 is attached to the guide member 2, the position restricting surface 331 contacts the first guide side wall 21, providing the functions of position restriction and positioning when attaching the extraction sleeve 3. Thereby, the connection structure 32 can be accurately attached to the guide member 2. Here, the position restricting surface 331 is flush with the side surfaces of the first positioning fin 323 and the second positioning fin 324, preventing the positioning fins from sliding along the axial direction X within the notches when the two positioning fins are attached to the two positioning notches. Further, it prevents the two side walls of the accommodating structure 31 from contacting the first guide side wall 21, improving the accuracy of positioning, reducing the difficulty of attachment, and improving the perpendicularity of the extraction sleeve 3 with respect to the first guide side wall 21.

[0048] Naturally, the position restricting structure 33 may be a protrusion of other shapes, such as a cuboid, cube, cylinder, or the like. Also, the position restricting surface 331 does not necessarily have to be a flat surface, and may be, for example, a curved surface, a bent surface, or the like. It is only necessary that it can contact or abut against the surface of the first guide side wall 21 when attaching the extraction sleeve 3 to achieve the above functions, and it is not particularly limited. The position restricting structure 33 may be formed by stamping from the bottom wall of the extraction sleeve 3, thus simplifying the process. The position restricting structure 33 may also be a separate member provided on the arc-shaped bottom wall 313 by means such as soldering or adhesion, and is not particularly limited here.

[0049] In some embodiments, as shown in FIGS. 5 to 7, the extraction sleeve 3 may be integrally formed. The insertion part 321 and the positioning part 322 of the connection structure 32 are both arc structures, for example, arc plates, and by being integrally formed with the arc bottom wall 313 of the accommodation structure 31, the manufacturing process can be simplified. Of course, it is not limited thereto, and the connection structure 32 and the accommodation structure 31 of the extraction sleeve 3 may be non-integrally formed. For example, the connection structure 32 and the accommodation structure 31 may be separate members connected by soldering, adhesion or screwing, respectively, and are not particularly limited herein. The insertion part 321 and the positioning part 322 do not have to be arc structures, and may be, for example, flat plate-like structures, structures with a V-shaped or inverted trapezoidal cross-section, etc., and are not particularly limited herein, as long as they respectively fit into the insertion port 232 and the mounting groove 211 of the guide member 2. That is, the shapes of the insertion port 232 and the mounting groove 211 may be adaptively designed according to the shapes of the insertion part 321 and the positioning part 322, and are not particularly limited herein.

[0050] As shown in FIGS. 5 to 7, when the insertion part 321 and the positioning part 322 are arc structures, the radian of the insertion part 321 is the same as that of the positioning part 322, and preferably, the radian of the insertion part 321 is less than or equal to that of the positioning part 322. Thereby, when attaching the extraction sleeve 3, the insertion part 321 can smoothly insert through the mounting groove 211 of the first guide side wall 21 in the axial direction X into the insertion port 232.

[0051] As shown in FIGS. 1 and 2, the extraction sleeve 3 is vertically connected to the side wall of the guide member 2. For example, the extraction sleeve 3 is perpendicular to the vertical plane of the first guide side wall 21. In this way, after the end 210 of the coil 200 is provided in the extraction sleeve 3, it can be vertically inserted into the through hole on the PCB to ensure smooth connection between the two.

[0052] In some embodiments, the number of the guide members 2 is one, the guide member 2 has two guide passages 20, and at least one extraction sleeve 3 is provided in each guide passage 20.

[0053] Taking the guide member 2 located on the first flange portion 12 of the main body portion 1 shown in FIG. 1 as an example, the guide member 2 has two guide passages 20. The two guide passages 20 extend in opposite directions, preventing congestion of the two ends of the coil 200 and further preventing the occurrence of a short circuit. At the same time, the attachment area provided by the main body portion 1 can be reasonably utilized, and the occupied space can be reduced. In other embodiments of the present invention, the guide member 2 may have two or more guide passages 20.

[0054] One, two, three or more extraction sleeves 3 can be installed in each guide passage 20, and when attaching, an extraction sleeve 3 that is easy to attach the end 210 of the coil 200 can be selected.

[0055] As shown in FIGS. 1 and 2, the number of guide members 2 is plural, and they are provided at two ends of the main body portion 1 facing the vertical direction Z. Each guide member 2 has at least one guide passage 20, and at least one extraction sleeve 3 is provided in each guide passage 20.

[0056] The number of guide members 2 may be two, three, four, or more. The plurality of guide members 2 may be provided on the side surfaces of the first flange portion 12 and the second flange portion 13 of the main body portion 1, and each guide member 2 may have one, two, three, or more guide passages 20. Thereby, a plurality of coils 200 can be wound around one main body portion 1, and the two ends 210 of each coil 200 can be guided from the guide passage 20 into the extraction sleeve 3. One, two, three, or more extraction sleeves 3 can be provided in each guide passage 20.

[0057] In some embodiments, the guide member 2 may be integrally formed with the first flange portion 12 and / or the second flange portion 13 of the main body portion 1 using, for example, an injection molding process.

[0058] As shown in FIG. 1, two guide members 2 are provided on the main body 1. The first guide member 2a is provided on the first flange portion 12, and the second guide member 2b is provided on the second flange portion 13. The first guide member 2a and the second guide member 2b each have two guide passages 20. One extraction sleeve 3 is attached to each guide passage 20 of the first guide member 2a, and two extraction sleeves 3 are attached to each guide passage 20 of the second guide member 2b. Regarding the setting of the quantity of the guide members 2, the quantity of the guide passages 20 of each guide member 2, and the quantity of the extraction sleeves 3, those skilled in the art can set them according to actual needs and are not particularly limited herein.

[0059] As shown in FIG. 13, the embodiment of the present invention further provides a magnetic element including a bobbin structure 100 and a coil 200. The bobbin structure 100 includes a main body 1, a guide member 2, and an extraction sleeve 3. Here, the guide member 2 is provided at an end portion of the main body 1 in the vertical direction Z of the main body 1, and a guide passage 20 is provided in the guide member 2. The extraction sleeve 3 is provided on the guide member 2, communicates with the guide passage 20, and includes a housing structure 31 having an opening, and the housing structure 31 protrudes from the guide member 2. The bobbin structure 100 may be the one described in any of the above embodiments, and other structures of the bobbin structure 100 are omitted herein.

[0060] The coil 200 is wound around the main body 1. The end portion 210 of the coil 200 is located in the extraction sleeve 3 through the guide passage 20. The extraction sleeve 3 has an annular closed space S, and the end portion 210 of the coil 200 is fixed and connected within this annular closed space S.

[0061] As shown in FIG. 13, the magnetic element may further include a core 300, which is provided on the main body 1. Specifically, the core 300 may be a frame structure, and the main body 1 is arranged within the frame structure. After the coil 200 is energized, the core 300 can provide a magnetic circuit.

[0062] In some embodiments, the coil 200 may have one, two, three, or more. Each coil 200 has two ends 210. The ends 210 of the coil 200 may be wrapped within the lead sleeve 3 on the bobbin structure 100.

[0063] In the magnetic element according to an embodiment of the present invention, the end 210 of the coil 200 can be guided into the lead sleeve 3 through the guide passage 20, thereby realizing automatic wiring, and the plurality of twisted wires of the coil 200 are not scattered. The end 210 of the coil 200 having a plurality of twisted wires is accommodated in an annular space, forms a housing structure 31 and a pin, and can be directly connected to a through hole on the PCB. The outer surface of the housing structure 31 is electrically connected to the through hole on the PCB, and the inner surface of the housing structure 31 is electrically connected to the coil 200, ensuring the electrical connection between the coil 200 and the through hole of the PCB, reducing the occupied space, simplifying the operation, and making the connection with the through hole more accurate.

[0064] As shown in FIGS. 12 and 13, the embodiment of the present invention further provides a coil lead-out method, including the following contents A1 to A4.

[0065] A1: Provide a bobbin structure 100. The bobbin structure 100 may be the bobbin structure 100 in any of the above embodiments, and its specific structure will not be described in detail here.

[0066] A2: Wind the coil 200 around the main body 1 of the bobbin structure 100, and guide the end 210 of the coil 200 from the guide passage 20 of the guide member 2 of the bobbin structure 100 into the lead sleeve 3.

[0067] A3: Press the lead sleeve 3 to form an annular closed space S in the lead sleeve 3 to wrap the end 210 of the coil 200.

[0068] As shown in FIG. 13, the extraction sleeve 3 can be pressed using a pressing tool 400. The pressing tool 400 includes a first pressing block 401 and a second pressing block 402. The first pressing block 401 and the second pressing block 402 each have a semi-circular recess, and the two semi-circular recesses can be joined into one complete circle. When pressing, the semi-circular recess of the first pressing block 401 supports the arc bottom wall 313 of the accommodation structure 31, and the semi-circular recess of the second pressing block 402 corresponds to the first side wall 311 and the second side wall 312 of the accommodation structure 31. The second pressing block 402 is biased to press the first side wall 311 and the second side wall 312 in a direction approaching the first pressing block 401, deforming the first side wall 311 and the second side wall 312 and finally forming them into the shape of the semi-circular recess of the second pressing block 402. Thereby, the first side wall 311, the second side wall 312, and the arc bottom wall 313 form an annular closed space S, which encloses the end portion 210 of the coil 200.

[0069] The pressing tool 400 can be selected according to the dimension of the diameter of the arc bottom wall 313 of the accommodation structure 31 so that the dimensions of the semi-circular recesses of the first pressing block 401 and the second pressing block 402 are adapted to the arc bottom wall 313.

[0070] A4: Solder the end portion 210 of the coil 200 to the extraction sleeve 3 to form an extraction end.

[0071] After the end portion 210 of the coil 200 is guided into the extraction sleeve 3, the coil 200 can be soldered to the inner wall of the annular closed space S of the accommodation structure 31, preventing the coil 200 from slipping out and ensuring that the coil 200 is electrically connected to the extraction sleeve 3. Further, after the pin formed by the coil 200 and the extraction sleeve 3 is soldered to the through hole, the extraction sleeve 3 can be electrically connected to the through hole, ensuring that the coil 200 is electrically connected to the circuit on the PCB through the through hole.

[0072] In some embodiments, soldering of the coil 200 and the lead-out sleeve 3 can be achieved using a soldering process such as wave soldering or reflow soldering.

[0073] In an embodiment of the present invention, after guiding the end portion 210 of the coil 200 into the lead-out sleeve 3, or after pressing the accommodating structure 31 of the lead-out sleeve 3, or after soldering the end portion 210 of the coil 200 and the lead-out sleeve 3, if the end portion 210 of the coil 200 extends from the accommodating structure 31 in the axial direction X, a wire cutting operation can be performed. That is, the end portion 210 of the coil 200 protruding from the accommodating structure 31 is removed, the end face of the coil 200 is flush with the end face of the accommodating structure 31, and a situation where a plurality of twisted wires of the coil 200 are scattered and difficult to insert into the through hole is prevented.

[0074] As described above, the coil lead-out method according to the embodiment of the present invention can guide the end portion 210 of the 200 through the guide passage 20 into the lead-out sleeve 3, thereby realizing automatic wiring, improving the lead efficiency, and preventing a plurality of twisted wires from being scattered. After the coil 200 is guided into the lead-out sleeve 3, the accommodating structure 31 of the lead-out sleeve 3 is pressed to form an annular closed space S, the coil 200 is wrapped in the space, the coil 200 and the accommodating structure 31 form a pin, the pin has more accurate dimensions, and can be more accurately connected to the through hole on the PCB, and the occupied space is reduced. The entire operation process is simple and rapid, and the lead efficiency is improved.

[0075] It should be noted that the specific structures such as "semicircle", "circle", "ring", etc. described in this application do not strictly refer to a semicircular, circular or annular structure. Due to the manufacturing process or the requirements of actual production, there may be a certain deviation in the actual structure, and this application is not limited thereto.

[0076] Note that the present invention should not be construed as limiting its application to the detailed structures and arrangement methods of the components described in this specification. The present invention allows for other embodiments and can be implemented and executed in various ways. The aforementioned variations and modifications are intended to be within the scope of the present invention. Note that the present invention disclosed and defined in this specification should be construed as covering all alternative combinations of two or more individual features described or clearly inferred in this specification and / or the drawings. All these different combinations constitute some alternative aspects of the present invention. The embodiments described in this specification show the best mode known for carrying out the present invention and enable those skilled in the art to use the present invention.

Explanation of Reference Numerals

[0077] 100, bobbin structure; 1, main body part; 11, winding part; 12, first flange part; 13, second flange part; 2, guide member; 2a, first guide member; 2b, second guide member; 20, guide passage; 21, first guide side wall; 211, mounting groove; 2111, mounting bottom surface; 212, first positioning notch; 213, second positioning notch; 22, second guide side wall; 23, guide bottom wall; 231, first side surface; 232, insertion port; 3, draw-out sleeve; 31, accommodation structure; 311, first side wall; 312, second side wall; 313, arc bottom wall; 3131, first cross-section; 3132, second cross-section; 32, connection structure; 321. Insertion part; 322. Positioning part; 323. First positioning fin; 324. Second positioning fin; 33. Position regulation structure; 331. Position regulation surface; 200. Coil; 210. End part of the coil; 300. Core; 400. Pressing tool; 401. First pressing block; 402. Second pressing block; X. Axial direction; Z. Vertical direction; S. Annular closed space

Claims

1. A main body around which the coil is wound; a guide member provided at an end of the main body in a vertical direction and having a guide passage; a receiving structure provided on the guide member, communicating with the guide passage and having an opening, the receiving structure including a pull-out sleeve protruding from the guide member; the guide passage is used to guide the end of the coil into the receiving structure, The bobbin structure is characterized in that the containing structure is ductile and is arranged to encase the end of the coil and close the opening after being pressed to form an annular closed space.

2. The pulling sleeve further includes a connecting structure connected to the guide member, the receiving structure is connected to the connecting structure and includes a first side wall, a second side wall and a circular bottom wall; The arc bottom wall is connected to the connecting structure, the first side wall and the second side wall are located on opposite sides of the arc bottom wall, and the receiving structure has a U-shape; 2. The bobbin structure according to claim 1, wherein the first side wall and the second side wall are arranged so as to form the annular closed space with the arc bottom wall after being pressed.

3. The bobbin structure described in claim 2, characterized in that the first cross-sectional outline of the arc bottom wall is semicircular, and the second cross-sectional outline formed by pressing the first side wall and the second side wall is semicircular, thereby causing the cross-sectional outline of the accommodating structure after being pressed to be circular.

4. The guide member is A guide bottom wall; a first guide side wall and a second guide side wall located on opposite sides of the guide bottom wall and connected to the guide bottom wall to form the guide passage; the first guide side wall has a mounting groove formed in the vertical direction, a mounting bottom surface of the mounting groove is lower than a surface of the guide bottom wall for placing an end of the coil, and a first side surface of the guide bottom wall facing the mounting groove is exposed; The first side surface has an insertion opening extending in a direction approaching the second guide side wall, 3. The bobbin structure according to claim 2, wherein the two opposing side walls of the mounting groove are further provided with a first positioning notch and a second positioning notch opposed to each other.

5. The connection structure includes: an insertion portion to be inserted into the insertion opening on the first side surface; A positioning part that is fitted and attached to the mounting groove, with one end connected to the insertion part and the other end connected to the arc bottom wall of the accommodation structure; A first positioning fin and a second positioning fin, which are respectively located on both opposite sides of the positioning part and are bent in a direction away from the positioning part, and are engaged with the first positioning notch and the second positioning notch. The bobbin structure according to claim 4 is characterized by including the above.

6. The first positioning fin is installed at a distance from the first side wall; The bobbin structure according to claim 5 is characterized in that the second positioning fin is installed at a distance from the second side wall.

7. The extraction sleeve further includes a position regulating structure, which is provided on the accommodation structure and extends in a direction close to the connection structure; The position regulating structure has a position regulating surface; The bobbin structure according to claim 5 is characterized in that the position regulating surface is flush with the side surfaces of the first positioning fin and the second positioning fin and contacts the first guide side wall.

8. The extraction sleeve is integrally formed; The insertion part and the positioning part of the connection structure are both arc structures and are integrally formed with the arc bottom wall of the accommodation structure; The arc degree of the insertion part is consistent with the arc degree of the positioning part. The bobbin structure according to claim 5 is characterized by the above.

9. The number of the guide members is one; The guide member includes at least two of the guide passages; Each of the guide passages is provided with at least one of the extraction sleeves. The bobbin structure according to any one of claims 1 to 8 is characterized by the above.

10. The number of the guide members is plural, and they are provided at two opposite ends of the main body part in the vertical direction; Each of the guide members has at least one of the guide passages; Each of the guide passages is provided with at least one of the extraction sleeves. The bobbin structure according to any one of claims 1 to 8 is characterized by the above.

11. The extraction sleeve is vertically connected to the side wall of the guide member. The bobbin structure according to any one of claims 1 to 8 is characterized by the above.

12. A magnetic element including a bobbin structure and a coil, wherein the bobbin structure is: A main body part for winding a coil; ​ A guide member provided at an end portion of the main body portion in the vertical direction and having a guide passage; A drawing sleeve provided on the guide member, communicating with the guide passage, and including a receiving structure having an opening, the receiving structure protruding from the guide member; The coil is wound around the main body portion; An end portion of the coil is located in the drawing sleeve through the guide passage; The drawing sleeve has an annular closed space, and an end portion of the coil is fixed and connected within the annular closed space. A magnetic element characterized by this.

13. Providing the bobbin structure according to any one of Claims 1 to 8; Winding a coil around the main body portion of the bobbin structure and guiding an end portion of the coil from a guide passage of a guide member of the bobbin structure to the drawing sleeve; Pressing the drawing sleeve to form an annular closed space in the drawing sleeve to wrap the end portion of the coil; Soldering the end portion of the coil and the drawing sleeve to form a drawn end. A coil drawing method characterized by including this.

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