Electromagnetic coil

Abstract

The utility model belongs to the technical field of electromagnetism, and discloses an electromagnetic coil. The electromagnetic coil comprises a framework, a first insertion piece, a second insertion piece and a coil, a protruding part is arranged on the framework, the first insertion piece and the second insertion piece are arranged at the two axial ends of the framework respectively, the wire is wound around the framework and provided with a leading-in end and a leading-out end, the leading-in end is connected with the first insertion piece, and the leading-out end is configured to be wound around the protruding part and then connected with the second insertion piece. The protruding part is arranged on the framework, the leading-out end can be wound on the protruding part to be pre-fixed and then is connected with the second inserting piece, the leading-out end can be in a tensioned state, the suspension situation is avoided, the situation that when resin is coated through injection molding in the later period, a wire is broken due to large injection molding pressure, and consequently an electromagnetic coil is disconnected can be reduced, and the service life of the electromagnetic coil is prolonged. And the arrangement can effectively prevent the wire from loosening, prevent the wire from being exposed during later injection molding of coated resin, and reduce potential safety hazards.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic technology, in particular to an electromagnetic coil. Background Art

[0002] An electromagnetic coil mainly comprises a bobbin, a wire and two inserts. The wire is wound around the bobbin to form a winding. The wire has two end leads, namely an introduction end and a lead-out end. In the prior art, during wire winding, the introduction end is first connected to one of the inserts, then the wire is wound around the bobbin to form a winding. After winding is completed, the lead-out end of the wire is directly wound around the other insert.

[0003] With such a setting, after wire winding is completed, the lead-out end is directly pulled out and connected to the insert, resulting in a phenomenon that a long section of the lead wire is suspended. During subsequent injection molding and coating with resin, the wire may be broken due to a relatively large injection pressure, causing the coil to be open-circuited. Moreover, with such a setting, the wire is prone to looseness, resulting in the exposure of the wire during subsequent injection molding and coating with resin, which is likely to pose a safety hazard.

[0004] Therefore, there is an urgent need to provide an electromagnetic coil to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an electromagnetic coil, which can keep the lead-out end in a tensioned state and avoid the problem of suspension, reduce the situation of the wire being broken due to a relatively large injection pressure, and reduce potential safety hazards.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An electromagnetic coil, comprising:

[0008] A bobbin, on which a convex portion is provided;

[0009] A first insert and a second insert, respectively arranged at two axial ends of the bobbin;

[0010] A wire, wound around the bobbin and having an introduction end and a lead-out end. The introduction end is connected to the first insert, and the lead-out end is configured to be wound around the convex portion and then connected to the second insert.

[0011] As an optional solution, the convex portion and the second insert are located on the same side in the radial direction of the bobbin.

[0012] As an optional solution, along the circumferential direction of the bobbin, the convex portion is arranged beside the second insert.

[0013] As an alternative, the skeleton includes a connecting wall, the second insert is fixed to the connecting wall, the protruding portion and the skeleton are of an integral structure, and the protruding portion protrudes from the connecting wall in a direction away from the axis of the skeleton.

[0014] As an alternative, the protruding portion includes a winding segment and a blocking end. The winding segment is disposed on the skeleton and is used for winding a part of the lead-out end. The blocking end is disposed at one end of the winding segment away from the skeleton. Along the width direction of the winding segment, both ends of the blocking end protrude from the winding segment respectively, and the protruding length of each end is greater than the diameter of the wire.

[0015] As an alternative, the skeleton includes a winding portion, a first stop portion and a second stop portion. The winding portion is used for winding the wire. The first stop portion and the second stop portion are respectively disposed at two axial ends of the winding portion and have a radial dimension greater than that of the winding portion. The first insert is disposed on the circumferential side of the first stop portion, and the second insert is disposed on the circumferential side of the second stop portion.

[0016] As an alternative, the protruding portion is disposed on the first stop portion and / or the second stop portion.

[0017] As an alternative, a wire inlet guiding groove is formed on the circumferential side wall of the first stop portion;

[0018] And / or, a wire outlet guiding groove is formed on the circumferential side wall of the second stop portion, and the protruding portion is located beside the wire outlet of the wire outlet guiding groove.

[0019] As an alternative, the bottom wall of the wire inlet guiding groove and / or the wire outlet guiding groove is an arc surface with a smooth transition.

[0020] As an alternative, a blocking member is disposed at one end of the wire inlet guiding groove close to the first insert, and the blocking member protrudes from the groove wall of the wire inlet guiding groove outward along the depth direction of the wire inlet guiding groove.

[0021] As an alternative, define the side of the first stop portion facing the second stop portion as the first reference wall, and the side of the second stop portion facing the first stop portion as the second reference wall;

[0022] An wire inlet extending groove communicating with the wire inlet guiding groove is formed on the first reference wall, and the wire inlet extending groove starts from the circumferential surface of the first stop portion and extends to the circumferential surface of the winding portion;

[0023] And / or, an outlet extending groove communicating with the outlet guiding groove is formed in the second reference wall, and the outlet extending groove starts from the circumferential surface of the second stop portion and extends to the circumferential surface of the winding portion.

[0024] As an alternative solution, a pressing portion is provided on the first insert, and the pressing portion can rotate relative to the first insert so that the pressing portion presses part of the introducing end against the first insert;

[0025] And / or, a pressing portion is provided on the second insert, and the pressing portion can rotate relative to the second insert so that the pressing portion presses part of the leading end against the second insert.

[0026] Advantages of the present utility model:

[0027] The present utility model provides an electromagnetic coil. By providing a convex portion on the skeleton, the leading end can be wound around the convex portion for pre-fixation and then connected to the second insert. In this way, the leading end can be in a tensioned state and the situation of suspension can be avoided. When injecting and coating resin later, the situation that the wire is broken due to the large injection pressure, resulting in the open circuit of the electromagnetic coil, can be reduced. And such a setting can effectively prevent the wire from loosening, avoid the exposure of the wire when injecting and coating resin later, and reduce potential safety hazards. Description of the drawings

[0028] Figure 1 is a schematic structural view of an electromagnetic coil provided by an embodiment of the present utility model Figure 1 ;

[0029] Figure 2 is Figure 1 a partial enlarged view at A in

[0030] Figure 3 is a schematic structural view of an electromagnetic coil provided by an embodiment of the present utility model Figure 2 ;

[0031] Figure 4 is a schematic structural view of a skeleton provided by an embodiment of the present utility model Figure 1 ;

[0032] Figure 5 is a schematic structural view of a skeleton provided by an embodiment of the present utility model Figure 2 ;

[0033] Figure 6 is a schematic structural view of a skeleton provided by another embodiment of the present utility model;

[0034] Figure 7 is a schematic structural view of a skeleton provided by still another embodiment of the present utility model.

[0035] In the figure:

[0036] 10. Skeleton; 11. Protrusion; 111. Winding segment; 112. Blocking end; 12. Winding part; 13. First stop part; 131. Inlet wire guiding groove; 1311. Arc surface; 132. Inlet wire extension groove; 133. Stopper; 134. First reference wall; 14. Second stop part; 141. Outlet wire guiding groove; 142. Outlet wire extension groove; 143. Second reference wall; 15. Connecting wall;

[0037] 20. First insert piece; 21. Pressing part;

[0038] 30. Second insert piece;

[0039] 40. Coil; 41. Introducing end; 42. Leading-out end. Detailed implementation mode

[0040] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model rather than all structures are shown in the accompanying drawings.

[0041] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and to the right", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below and to the left", and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0043] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] This embodiment provides an electromagnetic coil, which can be applied to a solenoid valve. Specifically, as Figure 1 and Figure 3 shown, the electromagnetic coil includes a bobbin 10, a first insert 20, a second insert 30, and a wire 40. A convex portion 11 is provided on the bobbin 10; the first insert 20 and the second insert 30 are respectively arranged at two axial ends of the bobbin 10. The two inserts are used to realize the electrical connection between the wire 40 and an external circuit. The wire 40 is wound around the bobbin 10 and has an inlet end 41 and an outlet end 42, that is, the two free ends of the wire 40 are respectively the inlet end 41 and the outlet end 42. The inlet end 41 is connected to the first insert 20, and the outlet end 42 is configured to be wound around the convex portion 11 and then connected to the second insert 30. Among them, the wire 40 can be selected as an enameled wire.

[0045] By providing the convex portion 11 on the bobbin 10, after the wire winding on the bobbin 10 is completed, the outlet end 42 can be wound around the convex portion 11 for pre-fixing and then connected to the second insert 30. With such a setting, when connecting to the second insert 30, the outlet end 42 can be in a tensioned state and the situation of being suspended can be avoided. During the later injection molding and coating with resin, the situation that the wire 40 is broken by the relatively large injection pressure, resulting in an open circuit of the electromagnetic coil, can be reduced. And such a setting can effectively prevent the wire 40 from loosening, avoid the exposure of the wire 40 during the later injection molding and coating with resin, and reduce potential safety hazards.

[0046] Optionally, the outlet end 42 is wound around the convex portion 11 and then connected to the second insert 30. Specifically, it can be wound two turns or three turns. There is no limit to the number of turns. As long as the outlet end 42 is in a tensioned state after being connected to the second insert 30.

[0047] Optionally, the connection manner between the insert and the bobbin 10 can be a plug-in manner, that is, a plug hole is provided at each of the two axial ends of the bobbin 10, and the first insert 20 and the second insert 30 are respectively plugged into the corresponding plug holes. The installation operation of the first insert 20 and the second insert 30 is convenient and fast through the plug-in fit. Optionally, an interference fit can be provided between the insert and the plug hole, so as to improve the firmness of the insert installation. In other embodiments, the connection manner between the insert and the bobbin 10 can also be a threaded connection or a riveting connection, etc., which is not limited herein.

[0048] In an alternative embodiment, as Figure 3 and Figure 4 shown, the skeleton 10 includes a wire winding portion 12, a first stop portion 13 and a second stop portion 14. The wire winding portion 12 is for winding a wire 40. The first stop portion 13 and the second stop portion 14 are respectively arranged at two axial ends of the wire winding portion 12 and have a radial dimension larger than that of the wire winding portion 12. The first insert piece 20 is arranged on the circumferential side of the first stop portion 13, and the second insert piece 30 is arranged on the circumferential side of the second stop portion 14. The wire winding portion 12 is cylindrical, and both the first stop portion 13 and the second stop portion 14 are disc-shaped and have a diameter larger than that of the wire winding portion 12. In this way, when the wire 40 is wound around the wire winding portion 12, the axial movement of the wire 40 can be restricted by the first stop portion 13 and the second stop portion 14, playing a role in positioning the wire 40.

[0049] In this embodiment, as Figure 3 and Figure 4 shown, the convex portion 11 is arranged on the second stop portion 14, so that the convex portion 11 and the second pin 30 can be arranged closer, which is more convenient for winding the lead end 42.

[0050] In another alternative embodiment, as Figure 6 shown, the convex portion 11 can also be arranged on the first stop portion 13, and the winding of the lead end 42 can also be realized.

[0051] In another alternative embodiment, as Figure 7 shown, the first stop portion 13 and the second stop portion 14 can be respectively provided with the convex portion 11. With such an arrangement, the lead-in end 42 can be wound around the convex portion 11 on the first stop portion 13 for pre-fixation, then connected to the first insert piece 20, and then wound around the wire winding portion 12. After the winding is completed, the lead-out end 42 can be wound around the convex portion 11 on the second stop portion 14 for pre-fixation and then connected to the second insert piece 30. With such an arrangement, the lead-in end 41 and the lead-out end 42 can be both in a tensioned state and the situation of being suspended can be avoided. When injecting and coating with resin later, the situation that the wire 40 is broken by the relatively large injection pressure, resulting in the open circuit of the electromagnetic coil, can be reduced.

[0052] Next, the present application will be described in detail with the convex portion 11 arranged on the second stop portion 14.

[0053] In an alternative embodiment, as Figure 1 shown, the convex portion 11 and the second insert piece 30 are located on the same side in the radial direction of the skeleton 10. With such an arrangement, the winding can be more convenient, and the operation is convenient and fast.

[0054] Furthermore, as Figure 1 and Figure 2As shown, along the circumference of the skeleton 10, the convex portion 11 is arranged beside the second insert piece 30. This arrangement can make the convex portion 11 closer to the second insert piece 30, shorten the length of the lead end 42 between the convex portion 11 and the second insert piece 30, and further reduce the possibility of the wire 40 being suspended.

[0055] In an alternative embodiment, as Figure 1 and Figure 3 shown, the skeleton 10 includes a connecting wall 15. The connecting wall 15 is a planar wall, and the second stop portion 14 is provided with the connecting wall 15. The second insert piece 30 is fixed to the connecting wall 15. The convex portion 11 and the skeleton 10 are of an integral structure, and the convex portion 11 protrudes relative to the connecting wall 15 in a direction away from the axis of the skeleton 10. Among them, the convex portion 11 and the skeleton 10 are made of the same material and are integrally formed by an injection molding process, which reduces the cost of part production, saves the assembly link between multiple parts, and is more firm and durable in structure. By forming the connecting wall 15 on the second stop portion 14, it is convenient for the forming process of the convex portion 11 and more convenient for the assembly of the second insert piece 30. Similarly, the above-mentioned connecting wall 15 is also provided on the first stop portion 13, and the structure is the same, so it will not be elaborated here.

[0056] In an alternative embodiment, as Figure 2 shown, the convex portion 11 includes a winding segment 111 and a blocking end 112. The winding segment 111 is arranged on the skeleton 10 and is used for winding a part of the lead end 42. The blocking end 112 is arranged at one end of the winding segment 111 away from the skeleton 10. Along the width direction of the winding segment 111, both ends of the blocking end 112 protrude from the winding segment 111 respectively, and the protruding length of each end is greater than the diameter of the wire 40, so that the convex portion 11 is constructed in a "T" - shaped structure. By setting the protruding length of each end of the blocking end 112 relative to the winding segment 111 to be greater than the diameter of the wire 40, when the lead end 42 of the wire 40 is wound around the winding segment 111, the outer circle of the wire loop formed after winding the lead end 42 will not protrude from the blocking end 112. Therefore, the lead end 42 of the wire 40 can be stably restricted on the winding segment 111, preventing the lead end 42 from detaching from the convex portion 11, so that the lead end 42 can be stably wound outside the convex portion 11 to ensure that the lead end 42 is in a tensioned state.

[0057] In an alternative embodiment, as Figure 3 shown, an inlet wire guiding groove 131 is formed on the circumferential side wall of the first stop portion 13, and the inlet end of the inlet wire guiding groove 131 is located beside the first insert piece 20. The introduction end 41 is wound around the winding portion 12 after being guided by the inlet wire guiding groove 131, so that the introduction end 41 can be hidden in the inlet wire guiding groove 131, preventing the introduction end 41 from contacting the wire 40, reducing the risk of electromagnetic coil short - circuit, and through the guidance of the inlet wire guiding groove 131, the situation of the introduction end 41 being suspended can also be reduced.

[0058] In an alternative embodiment, as Figure 4 and Figure 5 shown, the side of the first stop portion 13 facing the second stop portion 14 is defined as the first reference wall 134, and the side of the second stop portion 14 facing the first stop portion 13 is defined as the second reference wall 143. An inlet wire extension groove 132 communicating with the inlet wire guiding groove 131 is formed on the first reference wall 134. The inlet wire extension groove 132 starts from the circumferential surface of the first stop portion 13 and extends to the circumferential surface of the winding portion 12. During operation, first, the leading end 41 of the wire 40 is placed in the inlet wire guiding groove 131. After the leading end 41 of the wire 40 is fixed on the first insert piece 20, the leading end 41 then reaches the inlet wire extension groove 132 along the inlet wire guiding groove 131. After passing through the inlet wire extension groove 132, it reaches the winding portion 12, and the wire 40 is wound around the winding portion 12. By providing the inlet wire extension groove 132, the leading end 41 can always be attached to the skeleton 10, avoiding the situation where the leading end 41 is suspended.

[0059] In an alternative embodiment, as Figure 3 and Figure 4 shown, a stopper 133 may be provided at one end of the inlet wire guiding groove 131 close to the first insert piece 20. The stopper 133 protrudes outward from the groove wall of the inlet wire guiding groove 131 along the depth direction of the inlet wire guiding groove 131. When the leading end 41 is located in the inlet wire guiding groove 131, the stopper 133 can block the leading end 41 to prevent it from coming out of the inlet wire guiding groove 131, thereby ensuring that the leading end 41 can be stably located in the inlet wire guiding groove 131 and remain in a tensioned state.

[0060] In an alternative embodiment, as Figure 1 and Figure 5 shown, an outlet wire guiding groove 141 is formed on the circumferential side wall of the second stop portion 14, and the convex portion 11 is located beside the outlet of the outlet wire guiding groove 141. Specifically, in combination with Figure 2 , the convex portion 11 is located between the second insert piece 30 and the outlet of the outlet wire guiding groove 141. After the winding is completed, the leading end 42 of the wire 40 is wound around the convex portion 11 for several turns directly after being led out from the outlet wire guiding groove 141, and then connected to the second insert piece 30, shortening the length between the leading end 42 after being led out from the outlet wire guiding groove 141 and the convex portion 11, and further reducing the possibility of the leading end 42 being suspended.

[0061] Under the guiding action of the wire outlet guiding groove 141, the leading end 42 of the wire 40 can be restricted. After the leading end 42 is wound and fixed with the convex portion 11, the leading end 42 remains in a tensioned state within the wire outlet guiding groove 141 without being in a suspended state. When injecting and coating resin later, it can avoid the situation that the wire 40 is broken by the injection pressure, resulting in an open circuit of the electromagnetic coil. Secondly, the leading end 42 can be hidden in the wire outlet guiding groove 141 to prevent the leading end 42 from contacting the wire 40, reducing the risk of short circuit of the wire 40.

[0062] In an alternative embodiment, as Figure 5 shown, a wire outlet extension groove 142 communicating with the wire outlet guiding groove 141 is formed on the second reference wall 143. The wire outlet extension groove 142 starts from the circumferential surface of the second stop portion 14 and extends to the circumferential surface of the winding portion 12. After winding is completed, first introduce the leading end 42 of the wire 40 into the wire outlet guiding groove 141 through the wire outlet extension groove 142, and then the leading end 42 reaches the convex portion 11 along the wire outlet guiding groove 141. After winding the leading end 42 around the convex portion 11 for several turns, it is connected to the second insert piece 30. By providing the wire outlet extension groove 142, the leading end 42 can always be attached to the skeleton 10, avoiding the situation of the leading end 42 being suspended.

[0063] Among them, in combination with Figure 4 and Figure 5 , the openings of the wire inlet guiding groove 131 and the wire outlet guiding groove 141 face in opposite directions. That is to say, the wire inlet guiding groove 131 and the wire outlet guiding groove 141 are located on two opposite sides in the radial direction of the skeleton 10. Such a setting can make winding more convenient.

[0064] In an alternative embodiment, as Figure 5 shown, the bottom wall of the wire outlet guiding groove 141 can also be an arc surface 1311 with a smooth transition, so that the path of the lead wire is smoother, which can avoid the situation of wear when the leading end 42 passes through the wire outlet guiding groove 141 and prevent damage to the wire 40.

[0065] In an alternative embodiment, the bottom wall of the wire inlet guiding groove 131 can also be an arc surface 1311 with a smooth transition, so that the path of the lead wire is smoother, which can avoid the situation of wear when the leading-in end 41 passes through the wire inlet guiding groove 131 and prevent damage to the wire 40.

[0066] It should be noted that the leading-in end 41 and the first insert piece 20, and the leading end 42 and the second insert piece 30 are usually fixedly connected by welding to ensure the connection strength, which can better resist the injection pressure and prevent the connection from breaking.

[0067] In an alternative embodiment, as Figure 3As shown, a pressing portion 21 is provided on the first insert piece 20. The pressing portion 21 is specifically a thin-walled convex structure integrally formed on the first insert piece 20. The pressing portion 21 can rotate relative to the first insert piece 20 so that the pressing portion 21 presses a part of the leading end 41 onto the first insert piece 20. Through the above arrangement, during the welding process of the leading end 41 and the first insert piece 20, the pressing portion 21 is rotated towards the first insert piece 20, so that the pressing portion 21 presses a part of the leading end 41 onto the first insert piece 20, ensuring a tight fit between the leading end 41 and the first insert piece 20, and thus avoiding the phenomenon of poor soldering after welding due to insufficient fit.

[0068] In an alternative embodiment, a pressing portion 21 is also provided on the second insert piece 30. The pressing portion 21 can rotate relative to the second insert piece 30 so that the pressing portion 21 presses a part of the trailing end 42 onto the second insert piece 30, ensuring a tight fit between the trailing end 42 and the second insert piece 30, and thus avoiding the phenomenon of poor soldering after welding due to insufficient fit. Among them, the pressing portion 21 on the second insert piece 30 has the same structure as the pressing portion 21 on the first insert piece 20, only the setting directions are different, which will not be elaborated here.

[0069] Optionally, the pressing portion 21 has an initial position (i.e., Figure 3 the position in). Taking the pressing portion 21 on the first insert piece 20 as an example, in this embodiment, the included angle between the pressing portion 21 in the initial position and the first insert piece 20 is 30° - 40°, preferably 30°. This can not only ensure that there is a certain space between the pressing portion 21 and the first insert piece 20 for the leading end 41 to pass through, but also prevent the travel of the pressing portion 21 relative to the first insert piece 20 from being too large and causing the connection position between the pressing portion 21 and the first insert piece 20 to break. In other embodiments, this included angle can be adjusted adaptively according to the fatigue strength of the material, such as 45° or 60°, etc., and no specific limitation is made here.

[0070] Furthermore, as Figure 5 shown, the electromagnetic coil further includes a plastic-coated outer shell (not shown). The plastic-coated outer shell covers the skeleton 10 and the wire 40, and part of the first insert piece 20 and part of the second insert piece 30 protrude outside the plastic-coated outer shell, so that the exposed insert pieces can be more conveniently connected to external devices. The plastic-coated outer shell is a coated resin shell formed by an injection molding process, thereby ensuring the tightness of the covering of the skeleton 10 and the wire 40, and thus ensuring a good insulation effect.

[0071] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An electromagnetic coil, characterized in that include: A frame (10), wherein a protrusion (11) is provided on the frame (10); A first insert sheet (20) and a second insert sheet (30) are respectively arranged at two axial ends of the frame (10); A wire (40) is wound around the frame (10) and has an introduction end (41) and an extraction end (42), wherein the introduction end (41) is connected to the first plug-in sheet (20), and the extraction end (42) is configured to be wound around the protruding portion (11) and then connected to the second plug-in sheet (30).

2. The electromagnetic coil according to claim 1, characterized in that The protruding portion (11) and the second inserting piece (30) are located on the same radial side of the framework (10).

3. The electromagnetic coil according to claim 2, characterized in that Along the circumference of the frame (10), the protrusion (11) is arranged beside the second inserting piece (30).

4. The electromagnetic coil according to claim 3, characterized in that The frame (10) comprises a connecting wall (15), the second insert piece (30) is fixed to the connecting wall (15), the protrusion (11) and the frame (10) are an integral structure, and the protrusion (11) is arranged to protrude relative to the connecting wall (15) in a direction away from the axis of the frame (10).

5. The electromagnetic coil according to claim 1, characterized in that The raised portion (11) comprises a winding segment (111) and a blocking end (112); the winding segment (111) is arranged on the frame (10) and is used to wind around a portion of the lead-out end (42); the blocking end (112) is arranged at an end of the winding segment (111) away from the frame (10) and along the width direction of the winding segment (111); both ends of the blocking end (112) protrude from the winding segment (111) respectively, and the protruding length of each end is greater than the diameter of the wire (40).

6. The electromagnetic coil according to claim 1, characterized in that The skeleton (10) comprises a winding portion (12), a first stop portion (13) and a second stop portion (14); the winding portion (12) is used to wind the conductive wire (40); the first stop portion (13) and the second stop portion (14) are respectively arranged at two ends of the winding portion (12) in the axial direction and have a radial dimension greater than that of the winding portion (12); the first plug piece (20) is arranged on the circumferential side of the first stop portion (13); and the second plug piece (30) is arranged on the circumferential side of the second stop portion (14).

7. The electromagnetic coil according to claim 6, characterized in that The protruding portion (11) is arranged on the first stop portion (13) and / or the second stop portion (14).

8. The electromagnetic coil according to claim 6, characterized in that A wire entry guide groove (131) is provided on the circumferential side wall of the first stopper (13); And / or, a wire outlet guide groove (141) is provided on the circumferential side wall of the second stopper (14), and the protrusion (11) is located beside the wire outlet opening of the wire outlet guide groove (141).

9. The electromagnetic coil according to claim 8, characterized in that The groove bottom wall of the incoming wire guide groove (131) and / or the outgoing wire guide groove (141) is a smoothly transitioned arc-shaped surface (1311).

10. The electromagnetic coil according to claim 8, characterized in that A stopper (133) is provided at one end of the wire entry guide groove (131) close to the first plug piece (20), and the stopper (133) protrudes outward from the groove wall of the wire entry guide groove (131) along the depth direction of the wire entry guide groove (131).

11. The electromagnetic coil according to claim 8, characterized in that A side of the first stopper (13) facing the second stopper (14) is defined as a first reference wall (134), and a side of the second stopper (14) facing the first stopper (13) is defined as a second reference wall (143); The first reference wall (134) is provided with a wire entry extension groove (132) which is in communication with the wire entry guide groove (131); the wire entry extension groove (132) starts from the circumferential surface of the first stopper portion (13) and extends to the circumferential surface of the winding portion (12); And / or, a wire extension groove (142) communicating with the wire guide groove (141) is formed on the second reference wall (143), and the wire extension groove (142) starts from the circumferential surface of the second stop portion (14) and extends to the circumferential surface of the winding portion (12).

12. The electromagnetic coil according to any one of claims 1 to 11, characterized in that: The first plug sheet (20) is provided with a pressing portion (21), and the pressing portion (21) can rotate relative to the first plug sheet (20) so that the pressing portion (21) presses a portion of the introduction end (41) onto the first plug sheet (20); And / or, a pressing portion (21) is provided on the second plug sheet (30), and the pressing portion (21) can rotate relative to the second plug sheet (30) so that the pressing portion (21) presses part of the lead-out end (42) onto the second plug sheet (30).

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