Bobbin structure, magnetic element, and coil extraction method

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

[0006] , , , , ,

[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 is about to operate in a system, its electrical characteristics cannot be exerted 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 the 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 part is only for deepening the understanding of the background of the present invention, and may include information that does not constitute related technologies 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 comprising a body, a guide member, and a pull-out sleeve. The body is used for winding a coil. The guide member is provided at the vertical end of the body, and the guide member is provided with a guide passage. The pull-out sleeve is provided on the guide member and communicates with the guide passage, and the pull-out sleeve includes a housing structure having an opening, the housing structure protruding from the guide member. The guide passage is used to guide the end of the coil into the housing structure, and the housing structure is ductile and is arranged so as to be pressed to enclose the end of the coil, and then close the opening to form an annular closed space.

[0007] In some embodiments of the present invention, the drawer sleeve further includes a connecting structure connected to the guide member, and the housing structure is connected to the connecting structure and includes a first side wall, a second side wall and an arc-shaped bottom wall, wherein the arc-shaped 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-shaped bottom wall, and the housing structure is U-shaped. The first side wall and the second side wall are arranged so that they can form the annular closed space with the arc-shaped bottom wall after being pressed.

[0008] In some embodiments of the present invention, the first cross-sectional contour of the arc-shaped bottom wall is semicircular, the second cross-sectional contour formed by pressing the first and second side walls is semicircular, and the cross-sectional contour of the housing structure after being pressed is circular.

[0009] In some embodiments of the present invention, the guide member includes a guide bottom wall and 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, forming the guide passage. Here, the first guide side wall has a mounting groove formed in the vertical direction, 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. The first side surface has an insertion opening that extends toward the second guide side wall. The two opposing side walls of the mounting groove have further opposing first positioning notches and second positioning notches.

[0010] In some embodiments of the present invention, the connection structure includes an insertion portion inserted into the insertion opening on the first side surface; a positioning portion fitted into the mounting groove, with one end connected to the insertion portion and the other end connected to the arc-shaped bottom wall of the housing structure; and a first positioning fin and a second positioning fin, respectively, located on opposite sides of the positioning portion and bent toward a direction away from the positioning portion, 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 pull-out sleeve further includes a position-restricting structure provided in the housing structure and extending toward the connecting structure, the position-restricting structure having a position-restricting surface which is flush with the sides of the first positioning fin and the second positioning fin and in contact with the first guide side wall.

[0013] In some embodiments of the present invention, the drawer sleeve is integrally molded, the insertion portion and the positioning portion of the connection structure are both arc-shaped and integrally molded with the arc-shaped bottom wall of the housing structure, and the arc of the insertion portion matches the arc of the positioning portion.

[0014] In some embodiments of the present invention, the number of guide members is one, and the guide member includes at least two guide passages, each of which is provided with at least one pull-out sleeve.

[0015] In some embodiments of the present invention, the number of guide members is multiple and is provided at two vertically opposing ends of the main body, each guide member has at least one guide passage, and each guide passage is provided with at least one pull-out sleeve.

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

[0017] Embodiments of the present invention further provide a magnetic element comprising a bobbin structure and a coil. The bobbin structure comprises a main body, a guide member and a pull-out sleeve. The guide member is provided at the vertical end of the main body and is provided with a guide passage. The pull-out sleeve includes a housing structure provided on the guide member and communicating with the guide passage, having an opening, and the housing structure protrudes from the guide member. The coil is wound around the main body, and the ends of the coil are located within the pull-out sleeve via the guide passage, the pull-out sleeve having an annular closed space, and the ends of the coil are fixed and connected within the annular closed space.

[0018] Embodiments of the present invention further provide a coil drawing method, comprising the steps of: providing a bobbin structure as described in any of the above embodiments; winding a coil around the main body of the bobbin structure and guiding the end of the coil from the guide passage of the guide member of the bobbin structure to the drawing sleeve; pressing the drawing sleeve to form an annular closed space in the drawing sleeve, thereby enclosing the end of the coil; and soldering the end of the coil to the drawing sleeve to form a drawing 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, and the pull-out sleeve is provided on the guide member and communicates with the guide passage, allowing the end of the coil to be guided into the pull-out sleeve by the guide passage, thereby enabling automatic wiring. Furthermore, the pull-out sleeve includes a housing structure having an opening, and the housing structure protrudes from the guide member, and after the end of the coil is placed in the housing structure, the housing structure can be pressed and closed to form an annular closed space, thereby enclosing the end of the coil, and the end of a coil having multiple strands of wire is housed in the annular space, forming a pin with the housing structure, and can be directly connected to a through-hole, reducing the occupied space, simplifying 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 invention in detail with reference to the accompanying drawings. [Brief explanation of the drawing]

[0022] [Figure 1] This is a schematic structural perspective view of a bobbin structure shown in some embodiments of the present invention. [Figure 2] This is a schematic structural perspective view of a bobbin structure shown in some embodiments of the present invention. [Figure 3] It is a schematic structural perspective view of winding a coil around a bobbin structure shown in some embodiments of the present invention, where a state in which the lead-out sleeve is not yet pressed is shown. [Figure 4] It is a schematic structural perspective view of winding a coil around a bobbin structure shown in some embodiments of the present invention, where a state in which the lead-out sleeve is pressed is shown. [Figure 5] It is a schematic structural perspective view of the lead-out sleeve shown in some embodiments of the present invention. [Figure 6] It is a schematic structural perspective view of a state in which the lead-out sleeve shown in some embodiments of the present invention is pressed to form an annular closed space. [Figure 7] It is a schematic structural perspective view of the lead-out sleeve shown in some embodiments of the present invention. [Figure 8] It is a schematic structural perspective view of the main body part and the guide member shown in some embodiments of the present invention. [Figure 9] It is an enlarged view of portion A in FIG. 8. [Figure 10] It is a schematic structural perspective view of the bobbin structure shown in some embodiments of the present invention. [Figure 11] It is an enlarged view of portion B in FIG. 10. [Figure 12] It is a schematic structural perspective view of the magnetic element shown in some embodiments of the present invention, where a state in which the lead-out sleeve is not yet pressed is shown. [Figure 13] It is a three-dimensional schematic view of a state in which the lead-out sleeve in the magnetic element shown in some embodiments of the present invention is pressed.

Embodiments for Carrying Out the Invention

[0023] Exemplary embodiments are described below in more detail with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided to give the invention a complete and comprehensive view and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures indicate the same or similar components, and therefore their detailed description is omitted.

[0024] The following description will illustrate different exemplary embodiments of the present invention with reference to the accompanying drawings. The drawings illustrate different exemplary structures that form part of this specification and can carry out various aspects of the present invention. The present invention may also use other specific embodiments of parts, structures, exemplary devices, systems, and steps, and various structural and functional modifications are possible without departing from the spirit of the invention. Furthermore, the terms “above,” “between,” and “inside” are used herein to describe different exemplary features and elements of the present invention, and these terms are used herein for convenience, for example, depending on the orientation of the examples in the figures. Nothing in this specification should be construed as requiring a specific three-dimensional orientation for structures that fall within the scope of the present invention. Furthermore, “first,” “second,” etc., in the claims are used for notational purposes only and do not limit the order of their subject matter.

[0025] The flowcharts shown in the diagrams are illustrative and do not necessarily include all content and operations / steps, nor are they necessarily performed in the order described. For example, some operations / steps may be further divided, some operations / steps may be combined, or partially combined, and therefore the actual order in which they are performed may change depending on the actual situation.

[0026] Furthermore, in the description of the present invention, "multiple" means at least two, for example, two, three, etc., unless otherwise specified.

[0027] High-power magnetic elements typically use multiple stranded wires as coils. The ends of the coils are connected to pins, which are then inserted into through-holes on the PCB and soldered to establish an electrical connection between the magnetic element and the circuit on the PCB.

[0028] In related technologies, various methods can be used to connect the ends of a coil to a through-hole. For example, one method involves wrapping the ends of the coil around a pin and then inserting the pin into the through-hole. However, this method results in a messy coil end, reduces wiring space, prevents automatic wiring, is difficult to operate, and requires a large amount of space to be occupied. Another method involves wrapping the coil end with a pin, but this requires changing the pin, increases the space occupied by the changed pin, and wastes wire. Yet another method involves directly connecting multiple strands of wire at the coil end to the through-hole, eliminating the need for a pin. However, the multiple strands tend to scatter, are difficult to fix in the through-hole, require manual twisting, prevent automatic wiring, and result in wasted wire due to excessive length of the remaining ends.

[0029] Based on this, an embodiment of the present invention provides a bobbin structure 100 that can reduce the occupied space, simplify operation, enable automatic wiring, and prevent the waste of wire material.

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

[0031] In the embodiments of the present invention, the vertical direction Z is defined as the height direction of the main body 1. Furthermore, if the main body 1 is cylindrical or rectangular, the vertical direction Z refers to the axial direction of the main body 1, and the plane on which the first flange portion 12 and the second flange portion 13 extend is parallel to the radial direction of the main body 1. The technical terms "vertical direction," "radial direction," etc., are merely used to describe the structure of the embodiments of the present invention and do not have a restrictive 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 Figures 1 and 2, the guide member 2 is provided at the end of the main body 1 in the vertical Z direction. 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 pull-out sleeve 3 is provided on the guide member 2 and communicates with the guide passage 20. The pull-out sleeve 3 includes a housing structure 31 having an opening, and the housing structure 31 protrudes from the guide member 2. As shown in Figure 3, the guide passage 20 is used to guide the end 210 of the coil 200 into the housing structure 31. As shown in Figure 4, the housing structure 31 is ductile and is arranged so that the opening can be closed after pressing to form an annular closed space S, and is used to enclose the end 210 of the coil 200.

[0034] In an embodiment of the present invention, the end 210 of the coil 200 can be guided into the pull-out sleeve 3 via the guide passage 20, thereby enabling automatic wiring, i.e., wiring is performed using a robotic arm, eliminating the need for manual wiring and preventing the multiple strands of the end 210 from scattering (to emphasize the form of the multiple strands of the end 210 that do not scatter, Figures 3, 4, 11, and 12 do not show the form of the multiple strands of the end 210 of the coil 200, but schematically show the overall state after the end 210 has been soldered). After the end 210 of the coil 200 is placed in the housing structure 31, the housing structure 31 can be pressed and closed to form an annular closed space S. This encloses the end 210 of the coil 200, and the end 210 of the coil 200 with multiple strands is housed in the annular closed space S, forming a pin with the housing structure 31 and allowing direct connection to a through-hole on the PCB. This reduces the occupied space, simplifies operation, and makes the connection to the through-hole more accurate.

[0035] In some embodiments of the present invention, as shown in Figure 5, the drawer sleeve 3 includes a connecting structure 32, which is connected to a guide member 2. The housing structure 31 is connected to the connecting structure 32 and includes a first side wall 311, a second side wall 312, and an arc-shaped bottom wall 313. The housing structure 31 is U-shaped such that the arc-shaped 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 arc-shaped bottom wall 313. As shown in Figure 6, the first side wall 311 and the second side wall 312 are arranged so that they can form an annular closed space S with the arc-shaped bottom wall 313 after being pressed.

[0036] As shown in Figures 1 and 5, the drawer sleeve 3 extends along the 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 direction in which the axis of the drawer sleeve 3 extends.

[0037] In some embodiments of the present invention, as shown in Figure 5, the contour of the first cross-section 3131 of the arc-shaped bottom wall 313 is semicircular, and as shown in Figure 6, the contour of the second cross-section 3132 after the first side wall 311 and the second side wall 312 have been pressed is semicircular. As a result, the contour of the cross-section of the housing structure 31 after being pressed becomes circular.

[0038] In this embodiment of the present invention, the first cross section 3131 and the second cross section 3132 are each cross sections perpendicular to the axial direction X. That is, the arc-shaped bottom wall 313 is semicircular, and the first side wall 311 and the second side wall 312 form semicircular shapes that match the arc-shaped bottom wall 313 after being pressed. In this way, the pressing process is made easier, and the cross section of the housing structure 31 after being pressed is made circular, improving the fit with the through-hole and making the connection between the two more stable. Furthermore, the degree of fit can be improved by designing the arc of the arc-shaped bottom wall 313 of the housing structure 31 and the dimensions of the first side wall 311 and the second side wall 312 based on the diameter of the through-hole.

[0039] Continuing with reference to Figure 5, in an embodiment of the present invention, the connection structure 32 includes an insertion portion 321, a positioning portion 322, a first positioning fin 323, and a second positioning fin 324. Here, the positioning portion 322 and the insertion portion 321 are connected in the axial direction X and are used to connect to the guide member 2. The positioning portion 322 and the insertion portion 321 may be arc-shaped plate structures, with one end of the positioning portion 322 in the axial direction X connected to the insertion portion 321 and the other end connected to the arc-shaped bottom wall 313 of the housing structure 31. In some embodiments, the axes of the insertion portion 321, the positioning portion 322, and the arc-shaped bottom wall 313 are the same. The first positioning fin 323 and the second positioning fin 324 are located on opposite sides of the positioning portion 322, respectively, and are bent away from the positioning portion 322.

[0040] As shown in Figures 1 and 2, the guide member 2 may be provided on the flange portion of the main body 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 Figure 1, the guide passage 20 communicates with the winding space in the main body 1 so that the end 210 of the coil 200 can enter the guide passage 20 after it has been wound around the winding section 11.

[0042] As shown in Figures 8 and 9, a mounting groove 211 is provided in the first guide side wall 21 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 210 of the coil 200 is placed. This exposes the first side surface 231 of the guide bottom wall 23 facing the mounting groove 211. An insertion opening 232 is provided in the first side surface 231, extending toward the second guide side wall 22. The insertion portion 321 of the connecting structure 32 is inserted into the insertion opening 232 along the axial direction X, connecting the connecting structure 32 to the guide member 2. The shape and dimensions of the insertion opening 232 are to match the shape and dimensions of the insertion portion 321, and the fit between the insertion portion 321 and the insertion opening 232 is an interference fit or a clearance fit. Furthermore, applying an appropriate fixing adhesive to the insertion port 232 improves the connection strength between the two, prevents the drawer sleeve 3 from sliding in the axial direction X, and improves stability.

[0043] As shown in Figure 9, the shape and dimensions of the mounting groove 211 are both compatible with 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 arc-shaped, with its arc angle matching that of the positioning portion 322. As a result, the positioning portion 322 can be mounted in the mounting groove 211 along the axial direction X, ensuring the perpendicularity of the pull-out sleeve 3 to the guide member 2 and providing a positioning function.

[0044] Continuing with Figure 9, two opposing side walls of the mounting groove 211 are provided with opposing first positioning notches 212 and second positioning notches 213, respectively. The first positioning notches 212 and second positioning notches 213 are installed symmetrically. As shown in Figure 1, the first positioning fin 323 and the second positioning fin 324 are engaged with the first positioning notches 212 and second positioning notches 213, respectively. For example, the first positioning fin 323 and the second positioning fin 324 are interlocked with the first positioning notches 212 and second positioning notches 213 in an interference fit in the direction Z perpendicular to each other. Furthermore, for example, the first positioning fin 323 and the second positioning fin 324 are each provided with protrusions, and the inner walls of the first positioning notch 212 and the second positioning notch 213 are provided with locking grooves. When the first positioning fin 323 and the second positioning fin 324 are positioned within the first positioning notch 212 and the second positioning notch 213, respectively, the protrusions are locked into the corresponding locking grooves, thereby achieving locking between the positioning fins and the positioning notches. In this way, the two fins can be prevented from sliding in the axial direction X, further improving the stability of the connection between the pull-out sleeve 3 and the guide member 2. In addition, the first positioning fin 323, the second positioning fin 324 and the insertion portion 321 can provide a three-point positioning function, ensuring the positioning accuracy, verticality, and stability of the pull-out sleeve 3.

[0045] As shown in Figures 5 and 6, the first positioning fin 323 is installed at a distance from the first side wall 311 of the housing structure 31, and the second positioning fin 324 is installed at a distance from the second side wall 312 of the housing structure 31. That is, the end faces of the two positioning fins that are close to the housing structure 31 are spaced apart from the end faces of the two side walls of the housing structure 31, forming a separation groove structure. With this installation, after the first positioning fin 323 and the second positioning fin 324 are attached to the first positioning notches 212 and 213, the end faces of the first side wall 311 and the second side wall 312 do not come into contact with the first guide side wall 21 of the guide member 2. As a result, when the first side wall 311 and the second side wall 312 are subsequently pressed, the first guide side wall 21 is prevented from creating resistance, and the difficulty of pressing can be reduced. Furthermore, when the first side wall 311 and the second side wall 312 are pressed, 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. In other words, the two positioning fins do not deform and do not loosen due to the pressing force, thus ensuring the accuracy of the mounting position and the stability of the mounting of the pull-out sleeve 3.

[0046] As shown in Figure 7, in some embodiments, the pull-out sleeve 3 further includes a position regulating structure 33 provided in the housing structure 31 and extending toward the connection structure 32. The position regulating structure 33 has a position regulating surface 331, which, as shown in Figures 10 and 11, is flush with the sides of the first positioning fin 323 and the second positioning fin 324 and is in contact with the first guide side wall 21.

[0047] As shown in Figure 7, in some embodiments, the positioning structure 33 may be a wedge-shaped bump that protrudes from the outer surface of the arcuate bottom wall 313 of the housing structure 31 (a surface not used to cover the end 210 of the coil 200) and extends in a direction approaching the insertion portion 321 along the axial direction X. The positioning surface 331 is located at the end of the wedge-shaped bump approaching the insertion portion 321 and is a vertical surface. After the pull-out sleeve 3 is attached to the guide member 2, the positioning surface 331 contacts the first guide side wall 21 and provides positioning and positioning functions when attaching the pull-out sleeve 3. This allows the connection structure 32 to be accurately attached to the guide member 2. Here, the positioning surface 331 is flush with the sides 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. Furthermore, the two side walls of the housing structure 31 are prevented from contacting the first guide side wall 21, improving positioning accuracy, reducing the difficulty of installation, and improving the perpendicularity of the drawer sleeve 3 to the first guide side wall 21.

[0048] Naturally, the position-regulating structure 33 may be a protrusion of another shape, such as a rectangular parallelepiped, cube, or cylinder. Also, the position-regulating surface 331 is not necessarily flat, but may be a curved surface, a bent surface, etc. It is sufficient that it contacts or abuts against the surface of the first guide side wall 21 when the drawer sleeve 3 is installed to achieve the above function, and is not particularly limited. The position-regulating structure 33 may be formed by stamping from the bottom wall of the drawer sleeve 3, thus simplifying the process. The position-regulating structure 33 may also be a separate member provided on the arc bottom wall 313 by methods such as soldering or adhesive, and is not particularly limited here.

[0049] In some embodiments, as shown in Figures 5 to 7, the drawer sleeve 3 may be integrally molded. The insertion portion 321 and positioning portion 322 of the connecting structure 32 are both arc-shaped structures, such as arc-shaped plates, and the manufacturing process can be simplified by integrally molding them with the arc-shaped bottom wall 313 of the housing structure 31. Of course, this is not limited to this, and the connecting structure 32 and housing structure 31 of the drawer sleeve 3 may not be integrally molded. For example, the connecting structure 32 and housing structure 31 may be separate members connected by soldering, bonding, or screwing, and are not particularly limited here. The insertion portion 321 and positioning portion 322 do not have to be arc-shaped structures, and may be, for example, flat plate-shaped structures, structures with a V-shaped or inverted trapezoidal cross-section, etc., and are not particularly limited here, as long as they fit the insertion opening 232 and mounting groove 211 of the guide member 2, respectively. That is, the shapes of the insertion opening 232 and mounting groove 211 may be adaptively designed according to the shapes of the insertion portion 321 and positioning portion 322, and are not particularly limited here.

[0050] As shown in Figures 5 to 7, when the insertion portion 321 and the positioning portion 322 have an arc structure, the arc of the insertion portion 321 matches the arc of the positioning portion 322, and preferably, the arc of the insertion portion 321 is less than or equal to the arc of the positioning portion 322. As a result, when installing the drawer sleeve 3, the insertion portion 321 can pass through the mounting groove 211 of the first guide side wall 21 in the axial direction X and be smoothly inserted into the insertion opening 232.

[0051] As shown in Figures 1 and 2, the pull-out sleeve 3 is connected perpendicularly to the side wall of the guide member 2. For example, the pull-out 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 placed inside the pull-out sleeve 3, it can be inserted perpendicularly into the through-hole on the PCB, ensuring a smooth connection between the two.

[0052] In some embodiments, there is one guide member 2, which has two guide passages 20, and each guide passage 20 is provided with at least one pull-out sleeve 3.

[0053] Taking the guide member 2 located on the first flange portion 12 of the main body portion 1 shown in Figure 1 as an example, the guide member 2 has two guide passages 20, the two guide passages 20 extending in opposite directions, preventing congestion at the two ends of the coil 200 and further preventing short circuits. At the same time, the mounting area provided by the main body portion 1 can be rationally 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 drawer sleeves 3 can be installed in each guide passage 20, and a drawer sleeve 3 can be selected that makes it easy to attach the end 210 of the coil 200 when installing.

[0055] As shown in Figures 1 and 2, there are multiple guide members 2, which are provided at two ends of the main body 1 facing each other in the vertical direction Z. Each guide member 2 has at least one guide passage 20, and each guide passage 20 is provided with at least one pull-out sleeve 3.

[0056] The number of guide members 2 may be two, three, four, or more. Multiple guide members 2 may be provided on the sides 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. This allows multiple coils 200 to be wound around one main body portion 1, and the two ends 210 of each coil 200 to be guided from the guide passage 20 into the drawer sleeve 3. Each guide passage 20 may be provided with one, two, three, or more drawer sleeves 3.

[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, for example, by an injection molding process.

[0058] As shown in Figure 1, the main body 1 is provided with two guide members 2, 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 drawer sleeve 3 is attached to each guide passage 20 of the first guide member 2a, and two drawer sleeves 3 are attached to each guide passage 20 of the second guide member 2b. The number of guide members 2, the number of guide passages 20 of each guide member 2, and the number of drawer sleeves 3 can be set by a person skilled in the art according to their actual needs, and are not particularly limited here.

[0059] As shown in Figure 13, embodiments of the present invention further provide 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 a pull-out sleeve 3. Here, the guide member 2 is provided at the end of the main body 1 in the vertical Z direction, and a guide passage 20 is provided in the guide member 2. The pull-out sleeve 3 is provided on the guide member 2, communicates with the guide passage 20, and includes a housing structure 31 having an opening, the housing structure 31 protruding from the guide member 2. The bobbin structure 100 may be any of the embodiments described above, and other structures of the bobbin structure 100 are not described here.

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

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

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

[0063] In the embodiment of the present invention, the end 210 of the coil 200 can be guided into the pull-out sleeve 3 via the guide passage 20, thereby enabling automatic wiring and preventing the multiple strands of the coil 200 from scattering. The end 210 of the coil 200, which has multiple strands, is housed in an annular space and forms a pin with the housing structure 31, allowing it to 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 an electrical connection between the coil 200 and the through-hole on the PCB, while reducing the occupied space, simplifying operation, and making the connection to the through-hole more accurate.

[0064] As shown in Figures 12 and 13, embodiments of the present invention further provide a coil extraction method, which includes the following contents A1 to A4.

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

[0066] A2: The coil 200 is wound around the main body 1 of the bobbin structure 100, and the end 210 of the coil 200 is guided from the guide passage 20 of the guide member 2 of the bobbin structure 100 to the pull-out sleeve 3.

[0067] A3: Press the drawer sleeve 3 to form an annular, closed space S within the drawer sleeve 3, enclosing the end 210 of the coil 200.

[0068] As shown in Figure 13, the drawer sleeve 3 can be pressed using the pressing tool 400. The pressing tool 400 includes a first pressing block 401 and a second pressing block 402, each having a semicircular recess, and the two semicircular recesses can be joined to form a single complete circle. When pressed, the semicircular recess of the first pressing block 401 supports the arc-shaped bottom wall 313 of the housing structure 31, and the semicircular recess of the second pressing block 402 corresponds to the first side wall 311 and the second side wall 312 of the housing 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 to ultimately form the shape of the semicircular recess of the second pressing block 402. As a result, the first side wall 311, the second side wall 312 and the arc-shaped bottom wall 313 form an annular closed space S that encloses the end 210 of the coil 200.

[0069] The pressing tool 400 can be selected according to the diameter of the arcuate bottom wall 313 of the housing structure 31, such that the dimensions of the semicircular recesses of the first pressing block 401 and the second pressing block 402 fit the arcuate bottom wall 313.

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

[0071] After the end 210 of the coil 200 is guided into the pull-out sleeve 3, the coil 200 can be soldered to the inner wall of the annular closed space S of the housing structure 31, preventing the coil 200 from slipping out and ensuring that the coil 200 is electrically connected to the pull-out sleeve 3. Furthermore, after the pins formed by the coil 200 and the pull-out sleeve 3 are soldered to the through-hole, the pull-out sleeve 3 can be electrically connected to the through-hole, ensuring that the coil 200 is electrically connected to the circuit on the PCB via the through-hole.

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

[0073] In an embodiment of the present invention, if the end 210 of the coil 200 extends from the housing structure 31 in the axial direction X after the end 210 of the coil 200 has been guided into the pull-out sleeve 3, or after the housing structure 31 of the pull-out sleeve 3 has been pressed, or after the end 210 of the coil 200 has been soldered to the pull-out sleeve 3, a wire cutting operation can be performed. That is, the end 210 of the coil 200 that protrudes from the housing structure 31 is removed, the end face of the coil 200 is made flush with the end face of the housing structure 31, and a situation in which the multiple strands of the coil 200 become scattered and difficult to insert into the through-hole is prevented.

[0074] As described above, the coil pulling method according to the embodiment of the present invention allows the end 210 of 200 to be guided into the pulling sleeve 3 via the guide passage 20, thereby enabling automatic wiring, improving lead efficiency, and preventing multiple strands from scattering. After the coil 200 is guided into the pulling sleeve 3, the housing structure 31 of the pulling sleeve 3 is pressed to form an annular closed space S, the coil 200 is enclosed in this space, the coil 200 and the housing structure 31 form a pin, the pin has more precise dimensions and can be connected more accurately to through-holes on the PCB, and the occupied space is reduced, the entire operation process is simple and quick, and lead efficiency is improved.

[0075] Furthermore, the specific structures such as "semicircle," "circle," and "ring" described in this application do not strictly refer to semicircles, circles, or annular structures, and certain deviations from the actual structure may occur due to the manufacturing process or the needs of actual production, and this application is not limited thereto.

[0076] Furthermore, the present invention should not be construed as limiting its application to the detailed structure and arrangement of the components described herein. Other embodiments of the present invention are possible and can be carried out and implemented in various ways. The aforementioned modifications and alterations are intended to be within the scope of the present invention. Furthermore, the present invention disclosed and defined herein should be construed as extending to all alternative combinations of two or more individual features described or clearly presumed herein and / or in the drawings. All of these different combinations constitute several alternative aspects of the present invention. The embodiments described herein represent the best known modes for carrying out the present invention and enable those skilled in the art to use the present invention. [Explanation of symbols]

[0077] 100. Bobbin structure; 1. Main body; 11. Winding section; 12. First flange portion; 13. Second flange section; 2. Guide member; 2a, First guide member; 2b, second guide member; 20. Guide walkway; 21. First guide side wall; 211, mounting groove; 2111, mounting base; 212, First positioning notch; 213. Second positioning notch; 22. Second guide sidewall; 23. Guide bottom wall; 231, First Aspect; 232, insertion port; 3. Drawer sleeves; 31. Containment structure; 311, First side wall; 312, second side wall; 313. Arc-shaped base wall; 3131, first cross-section; 3132, second cross-section; 32. Connection structure; 321, insertion part; 322, Positioning section; 323, First positioning fin; 324, second positioning fin; 33, position regulation structure; 331. Positional control surface; 200, coil; 210, the ends of the coil; 300, Iron core; 400, pressing tool; 401, First pressure block; 402, Second pressure block; X, axial; Z, vertical direction; S, a closed, ring-shaped space

Claims

1. The main body around which the coil is wound, A guide member provided at the vertical end of the main body, and having a guide passage, The guide member includes a housing structure provided on the guide member and communicating with the guide passage, and having an opening, the housing structure including a drawer sleeve that protrudes from the guide member, The guide passage is used to guide the end of the coil into the housing structure. The housing structure is ductile and is arranged to enclose the end of the coil, so as to be pressed and then close the opening to form an annular, closed space. A bobbin structure characterized in that the end of the wrapped coil forms a pin with the housing structure, and the pin is used for connection to a PCB.

2. The drawer sleeve further includes a connecting structure that is connected to the guide member, The housing structure is connected to the connecting structure and includes a first side wall, a second side wall, and an arc-shaped bottom wall. The arc-shaped 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-shaped bottom wall, and the housing structure has a U-shape. The bobbin structure according to claim 1, characterized in that the first side wall and the second side wall are arranged so that they can form the arc-shaped bottom wall and the annular closed space after being pressed.

3. The bobbin structure according to claim 2, characterized in that the first cross-sectional contour of the arc-shaped bottom wall is semicircular, the second cross-sectional contour formed by pressing the first side wall and the second side wall is semicircular, and the cross-sectional contour of the housing structure after being pressed is circular.

4. The guide member is Guide bottom wall, It includes a first guide side wall and a second guide side wall, which are located on opposite sides of the guide bottom wall and connected to the guide bottom wall, and which form the guide passage, The first guide side wall has a mounting groove provided in the vertical direction, and the mounting bottom surface of the mounting groove is lower than the surface of the guide bottom wall on which the end of the coil is placed, exposing the first side surface of the guide bottom wall facing the mounting groove. The first side surface is provided with an insertion opening that extends in a direction approaching the second guide side wall. The bobbin structure according to claim 2, characterized in that the two opposing side walls of the mounting groove are further provided with opposing first positioning notches and second positioning notches.

5. The aforementioned connection structure is An insertion portion inserted into the insertion opening on the first side surface, A positioning part that is fitted into the mounting groove, with one end connected to the insertion part and the other end connected to the arc-shaped bottom wall of the housing structure, The bobbin structure according to claim 4, further comprising a first positioning fin and a second positioning fin, each positioned on opposite sides of the positioning portion and bent toward a direction away from the positioning portion, and engaged with the first positioning notch and the second positioning notch, respectively.

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

7. The aforementioned drawer sleeve further includes a position-restricting structure, which is provided on the housing structure and extends in a direction adjacent to the connecting structure, The aforementioned position regulating structure has a position regulating surface, The bobbin structure according to claim 5, characterized in that the position regulating surface is flush with the side surfaces of the first positioning fin and the second positioning fin and in contact with the first guide side wall.

8. The aforementioned drawer sleeve is integrally molded, The insertion portion and the positioning portion of the connection structure are both arc-shaped and integrally molded with the arc-shaped bottom wall of the housing structure. The bobbin structure according to claim 5, characterized in that the radii of the insertion portion match the radii of the positioning portion.

9. The number of the guide members is one. The guide member includes at least two of the guide passages, The bobbin structure according to any one of claims 1 to 8, characterized in that each of the guide passages is provided with at least one of the drawer sleeves.

10. The number of the guide members is multiple, and they are provided at the two vertically opposing ends of the main body. Each of the guide members has at least one of the guide passages, The bobbin structure according to any one of claims 1 to 8, characterized in that each of the guide passages is provided with at least one of the drawer sleeves.

11. The bobbin structure according to any one of claims 1 to 8, characterized in that the pull-out sleeve is connected perpendicularly to the side wall of the guide member.

12. A magnetic element comprising a bobbin structure and a coil, The aforementioned bobbin structure is The main body around which the coil is wound, A guide member provided at the vertical end of the main body, and having a guide passage, The guide member includes a housing structure provided on the guide member and communicating with the guide passage, and having an opening, the housing structure including a drawer sleeve that protrudes from the guide member, The coil is wound around the main body, The ends of the coil are guided into the housing structure via the guide passage. The housing structure is ductile and is arranged to enclose the end of the coil, so as to be pressed and then close the opening to form an annular, closed space. A magnetic element characterized in that the end of the enclosed coil forms a pin with the housing structure, and the pin is used for connection to a PCB.

13. A step of providing a bobbin structure according to any one of claims 1 to 8, The steps include winding the coil around the main body of the bobbin structure and guiding the end of the coil from the guide passage of the guide member of the bobbin structure to the pull-out sleeve, The steps include pressing the aforementioned drawer sleeve to form an annular, closed space within the drawer sleeve, thereby enclosing the end of the coil, A coil pulling method characterized by comprising the step of soldering the end of the coil to the pulling sleeve to form a pulling end.

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